Omron CJ2 - 02-2010, SYSMAC CJ, SYSMAC CJ2H-CPU6, SYSMAC CJ2M-CPU3, SYSMAC CJ2M-CPU1 User Manual

Cat. No. W473-E1-06

CJ2 CPU Unit Software

SYSMAC CJ Series
CJ2H-CPU6_-EIP
CJ2H-CPU6_
CJ2M-CPU_

USER’S MANUAL

 OMRON, 2008

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, or
by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission of
OMRON.

No patent liability is assumed wi th respect to the use of the information contained herein. Moreover, because OMRON is con­stantly striving to improve its high-quality products, the information contained in this manual is subject to change without
notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained in
this publication.

SYSMAC CJ Series
CJ2H-CPU6@-EIP
CJ2H-CPU6@
CJ2M-CPU@@
CJ2 CPU Unit Software

User’s Manual

Revised February 2010

1

CJ2 CPU Unit Software User’s Manual

Introduction

Thank you for purchasin g a CJ-series CJ2H-CPU6@(-EIP) or CJ2M-CPU@@ Progr ammab le Controller.
This manual contains information required to use the CJ2H-CPU6@(-EIP) or CJ2M-CPU@@. Please
thoroughly read and understand this manual bef ore y ou use the CJ2H-CPU6@(-EIP) or CJ2M-CPU@@.

This manual is intended for the following personnel, who must also have knowledge of electrical sys­tems (an electrical engineer or the equivalent).

• Personnel in charge of installing FA systems

• Personnel in ch arge of designing FA systems.

• Personnel in charge of managing FA systems and facilities.

CJ-series CJ2 CPU Units

• CJ2H-CPU6@-EIP

• CJ2H-CPU6@

•CJ2M-CPU3@

•CJ2M-CPU1@
In this manual, the following notation is used to indicate the CPU Units.

• CJ2H-CPU6@(-EIP): Indicates the CJ2H-CPU6@-EIP and CJ2H-CPU6@ CPU Units.

• CJ2M-CPU@@: Indicates the CJ2M-CPU3@ and CJ2M-CPU1@ CPU Units.

Intended Audience

Applicable Products

CJ2 Series

CJ1H-CPU@@H-R
CJ1H-CPU@@H
CJ1G-CPU@@H
CJ1G -CPU@@P

(Loop CPU Units)

CJ1-H CPU Units

CJ1 CPU Units

CJ1G-CPU@@

CJ1M CPU Units

CJ1M-CPU@@

CJ-series Power Supply Units

CJ-series Basic I/O Units

CJ-series CPU Bus Units

CJ-series Special I/O Units

CS1H-CPU@@H
CS1G-CPU@@H

CS1-H CPU Units

CS-series Power Supply Units

CS-series Basic I/O Units

CS-series CPU Bus Units

CS-series Special I/O Units

CS Series

CS1 CPU Units

CS1H-CPU@@(-V)
CS1G-CPU@@(-V)

CS1D CPU Units

CS1D CPU Units
for Duplex Systems

CS1D-CPU@@H

CS1D-CPU@@S

CS1D-CPU@@P

NSJ5-TQ@@(B)-G5D
NSJ5-SQ@@(B)-G5D
NSJ8-TV@@(B)-G5D
NSJ10-TV@@(B)-G5D
NSJ12-TS@@(B)-G5D

NSJ Controllers

NSJ-series Expansion Units

NSJ Series

NSJ5-TQ@@(B)-M3D
NSJ5-SQ@@(B)-M3D
NSJ8-TV@@(B)-M3D

NSJ Controllers

CJ2H-CPU6@-EIP
CJ2H-CPU6@

CS1D CPU Units
for Simplex Systems

CS1D Process-control CPU Units

Note: A special Power Supply Unit must

be used for CS1D CPU Units.

CJ2 CPU Units

CJ2H CPU Units

CJ2M CPU Units

CJ2M-CPU3@
CJ2M-CPU1@

2

CJ2 CPU Unit Software User’s Manual

CJ2 CPU Unit Manuals

Information on the CJ2 CPU Units is provided in th e f ollo wi ng man uals . Refer to the appropriate manual
for the information that is required.

Wiring

1

2

3

4

5

6

7

This Manual

Mounting
and Setting
Hardware

Connecting
Online to
the PLC

Software
Setup

Creating the
Program

Checking
and
Debugging
Operation

Maintenance
and
Troubleshooting

Error codes and
remedies if a problem
occurs

CJ-series CJ2 CPU Unit
Hardware User’s Manual
(Cat. No. W472)

CJ-series CJ2 CPU Unit
Software User’s Manual
(Cat. No. W473)

• Unit part names and

specifications

• Basic system

configuration

• Unit mounting

procedure

• Setting procedure for

DIP switch and rotary
switches on the front of
the CPU Unit

For details on built-in
EtherNet/IP port, refer to
the EtherNet/IP Unit
Operation Manual (W465)

• Wiring the Power

Supply Unit

• Wring Basic I/O Units

and external I/O
devices

CX-Programmer Support
Software Connecting
Cables

Procedures for connecting
the CX-Programmer
Support Software

Software setting methods for the
CPU Unit (including I/O memory
allocation, PLC Setup settings,
Special I/O Unit parameters,
CPU Bus Unit parameters, and
routing tables.)

For details on built-in EtherNet/IP
port, refer to the EtherNet/IP Unit
Operation Manual (W465).

• Program types and basic

information

• CPU Unit operation

• Internal memory

• Data management using

file memory in the CPU
Unit

• Built-in CPU functions

• Settings

• Checking I/O wiring, setting the

Auxiliary Area settings, and
performing trial operation

• Monitoring and debugging with

the CX-Programmer

Detailed information
on programming
instructions

CS/CJ/NSJ Series
Instructions Reference
Manual (Cat. No. W474)

3

CJ2 CPU Unit Software User’s Manual

The CJ2 CPU manuals are organized in the sections listed in the f o llo wing tab les . Refer to the appropri­ate section in the manuals as required.

Manual Configuration

Hardware User’s Manual (Cat. No. W472)

Section Content

Section 1 Overview

This section gives an overview of the CJ2 CPU Units and describes the features and
specifications.

Section 2 Basic System Configu­ration and Devices

This section describes the system configuration for the CJ2 CPU Unit.

Section 3 Nomenclature and
Functions

This section describes the part names and functions of the CPU Unit and Configuration
Units.

Section 4 Support Software

This section describes the types of Support Software to use to perform programming and
debugging and how to connect the PLC to the Support Software.

Section 5 Installation

This section describes the installation locations and how to wire CPU Units and Configu­ration Units.

Section 6 Troubleshooting

This section describes how to check the status for errors that occur during system opera­tion and the remedies for those errors.

Section 7 Inspection and Mainte­nance

This section describes periodic inspection, the service life of the Battery and Power Sup­ply Unit, and how to replace the Battery.

Section 8 Backup Operations This section describes the procedure to back up PLC data.

Appendices

The appendices provide Unit dimensions, details on fatal and non-fatal errors, informa­tion on connecting to serial ports on the CPU Unit, the procedure for installing the USB
driver on a computer, and information on load short-circuit protection and line disconnec­tion detection.

Software User’s Manual (Cat. No. W473) (This Manual)

Section Content

Section 1 Overview

This section gives an overview of the CJ2 CPU Units and describes the features and
specifications.

Section 2 Internal Memory in the
CPU Unit

This section describes the types of memory in the CPU Unit and the data that is stored.

Section 3 CPU Unit Operation This section describes the internal operation of the CPU Unit.
Section 4 CPU Unit Initialization This section describes the initial setup of the CPU Unit.
Section 5 Understanding Pro-

gramming

This section describes program types and programming details, such as symbols and
programming instructions.

Section 6 I/O Memory Areas This section describes the I/O memory areas in the CPU Unit.
Section 7 File Operations

This section describes the files that can be stored in the CPU Unit, the storage destina­tion for those files, and file operations.

Section 8 I/O Allocations and
Unit Settings

This section describes the I/O allocations used to exchange data between the CPU Unit
and other Units.

Section 9 PLC Setup

This section describes details on the PLC Setup settings, which are used to perform
basic settings for the CPU Unit.

Section 10 CPU Unit Functions This section describes functions that are built into the CPU Unit.
Section 11 Programming Devices

and Communications

This section describes the procedure for connecting the CJ2 CPU Unit to the CX-Pro­grammer or other Support Software and to other devices.

Section 12 CPU Unit Cycle Time This section describes how to monitor and calculate the cycle time.

Appendices

The appendices provide information on programming instructions, execution times, num­ber of steps, Auxiliary Area words and bits, a memory map of the continuous PLC mem­ory addresses, I/O memory operation when power is interrupted, and a comparison of
CJ-series and CS-series PLCs.

4

CJ2 CPU Unit Software User’s Manual

Instructions Reference Manual (Cat. No. W474)

Section Content

Section 1 Basic Understanding
of Instructions

This section provides basic information on designing ladder programs for a CS/CJ/NSJ­series CPU Unit.

Section 2 Summary of Instruc­tions

This section provides a summary of instructions used with a CS/CJ/NSJ-series CPU
Unit.

Section 3 Instructions

This section describes the functions, operands and sample programs of the instructions
that are supported by a CS/CJ/NSJ-series CPU Unit.

Section 4 Instruction Execution
Times and Number of Steps

This section provides the instruction execution times for each CS/CJ/NSJ-series CPU
Unit instruction.

Appendices

The appendices provide a list of instructions by function code and by mnemonic and an
ASCII table for the CS/CJ/NSJ-series CPU Units.

5

CJ2 CPU Unit Software User’s Manual

Manual Structure

The following page structure is used in this manual.

Special information in this manual is classified as follows:

Page Structure

Special Information

Precautions for Safe Use

Precautions on what to do and what not to do to ensure using the product safely.

Precautions for Correct Use

Precautions on what to do and what not to do to ensure proper operation and performance.

Additional Information

Additional information to increase understanding or make operation easier.

Level 1 heading
Level 2 heading
Level 3 heading

Level 2 heading

A step
in a procedure

Manual name

Level 3 heading

Page tab

Gives the current
headings.

Gives the number
of the section.

This illustration is provided only as a sample and may not literally appear in this manual.

Special Information
(See below.)

5-13

5 Installation

CJ2 CPU Unit Hardware User’s Manual

noitallatsnI 2-5

5

stnen

opmoC CL

P

gnitcennoC 1-2-5

5-2 Installation

The Units that make up a CJ-series PLC can be connected simply by pressing the Units together and
locking the sliders by moving them toward the back of the Units. The End Cover is connected in the
same way to the Unit on the far right side of the PLC.

1. Join the Units so that the connectors fit exactly.

2. The yellow sliders at the top and bottom of each Unit lock the Units together. Move the sliders

toward the back of the Units as shown below until they click into place.

Precautions for Correct UsePrecautions for Correct Use

If the locking tabs are not secured properly, the connectors may become loose and not function
properly. Be sure to slide the locking tabs until they are securely in place.

5-2-1 Connecting PLC Components

Connector

Hook

Hook holes

Slider

Lock

Release

Move the sliders toward the back
until they lock into place.

6

CJ2 CPU Unit Software User’s Manual

7

CJ2 CPU Unit Software User’s Manual

Sections in this Manual

1

10

2

11

3

12

4

5

6

7

8

9

1

10

2

11

3

12

4

5

6

7

8

9

Overview

I/O Memory Areas

File Operations

A

A

Appendices

Internal Memory
in the CPU Unit

CPU Unit
Operation

CPU Unit
Initialization

Understanding Programming

I/O Allocations and Unit Settings

PLC Setup

CPU Unit
Functions

Programming Devices
and Communications

CPU Unit
Cycle Time

8

CJ2 CPU Unit Software User’s Manual

9

CJ2 CPU Unit Software User’s Manual

CONTENTS

Introduction............................................................................................................... 1

CJ2 CPU Unit Manuals............................................................................................. 2

Manual Structure ...................................................................................................... 5

Sections in this Manual............................................................................................ 7

Safety Precautions ................................................................................................. 21

Application Precautions......................................................................................... 25

Operating Environment Precautions.................................................................... 30

Regulations and Standards...................................................................................31

Unit Versions of CJ2 CPU Units ............................................................................ 33

Related Manuals ..................................................................................................... 38

Section 1 Overview

1-1 Overview of CJ2 CPU Units ....................................................................................................1-2

1-1-1 Overview.....................................................................................................................................1-2

1-1-2 CJ2 CPU Unit Features..............................................................................................................1-4

1-2 Basic Operating Procedure .................................................................................................. 1-11

Section 2 Internal Memory in the CPU Unit

2-1 Overview................................................................................................................................... 2-2

2-1-1 Memory Configuration................................................................................................................2-2

2-1-2 Memory Areas and Stored Data................................................................................................. 2-3

2-1-3 Transferring Data from a Programming Device to the CPU Unit........................... ... ................... 2-4

Section 3 CPU Unit Operation

3-1 CPU Unit Internal Operation.............................................................................................. ..... 3-2

3-1-1 Overview.....................................................................................................................................3-2

3-1-2 Cycle Time.................................................... ............................................... ............................... 3-4

3-1-3 Processing at Power Interruptions.............................................................................................. 3-7

3-2 CPU Unit Operating Modes.. .... .......................................... ......................................... ............3-8

3-2-1 Operating Modes........................................................................................................................3-8

3-2-2 Checking the Operating Mode.................................................................................................... 3-9

3-2-3 Changing the Operating Mode.................................................................................................. 3-10

3-2-4 Operating Mode Details............................................................................................................ 3-14

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CJ2 CPU Unit Software User’s Manual

Section 4 CPU Unit Initialization

4-1 Overview of CPU Unit Initialization................................................................... ... ... ... ............ 4-2

4-1-1 CPU Unit Initial Settings..............................................................................................................4-2

4-2 PLC Setup ................................................................................................................................ 4-8

4-3 Creating I/O Tables.. .......................................... .......................................... ............................ 4-9

4-3-1 I/O Tables....................................................................................................................................4-9

4-3-2 Automatic Allocation..................................................................................................................4-10

4-3-3 Manual Allocation......................................................................................................................4-10

4-4 Setting Routing Tables......... ... .... ... ... ... .......................................... ....................................... 4-11

4-4-1 Routing Tables..........................................................................................................................4-11

4-4-2 Cases in Which Routing Tables Are Required ..........................................................................4-13

4-4-3 Setting and Transferring Routing Tables ...................................................................................4-14

4-5 Setting Allocated DM Area Words for Special I/O Units and CPU Bus Units...................4-15

4-5-1 Setting Allocated DM Area Words for Special I/O Units and CPU Bus Units............................4-15

4-5-2 Setting Procedure .....................................................................................................................4-15

4-6 CPU Bus Unit Setup Area ................................................................. .................................... 4-16

4-6-1 CPU Bus Unit Setup Area.........................................................................................................4-16

4-6-2 Setting Procedure .....................................................................................................................4-16

Section 5 Understanding Programming

5-1 Programming ........................................................................................................................... 5-3

5-1-1 Programming Overview...............................................................................................................5-3

5-1-2 Basic Ladder Diagram Concepts................................................................................................5-6

5-1-3 ST Language...............................................................................................................................5-8

5-1-4 SFC Overview.............................................................................................................................5-9

5-2 Tasks....................................................................................................................................... 5-11

5-2-1 Overview of Tasks.....................................................................................................................5-11

5-2-2 Cyclic Tasks......................... ... ..................................................................................................5-14

5-2-3 Interrupt Tasks ..........................................................................................................................5-20

5-2-4 Designing Tasks........................................................................................................................5-28

5-3 Sections..................................................................................................................................5-38

5-3-1 Overview of Sections................................................................................................................5-38

5-4 Function Blocks..................................................................................................................... 5-40

5-4-1 Function Blocks........................................................... ... ...........................................................5-40

5-4-2 Features of Function Blocks......................................................................................................5-41

5-4-3 Function Block Specifications ...................................................................................................5-42

5-5 Symbols.................................................................................................................................. 5-45

5-5-1 Overview...................................................................................................................................5-45

5-5-2 Types of Symbols......................................................................................................................5-46

5-5-3 Global Symbols.........................................................................................................................5-48

5-5-4 Local Symbols...........................................................................................................................5-48

5-5-5 Network Symbols (CJ2H-CPU6

@-EIP and CJ2M-CPU3@ Only).............................................5-49

5-5-6 Variables in Function Blocks ............................... .. ... .................................................................5-53

5-5-7 Symbol Data Types...................................................................................................................5-54

5-5-8 Automatic Address Allocation to Symbols.................................................................................5-59

5-6 Instructions............................................................................................................................ 5-60

5-6-1 Basic Understanding of Instructions .........................................................................................5-60

5-6-2 Specifying Operands.................................................................................................................5-67

5-6-3 Data Formats.................... ........................................................................................................5-75

5-6-4 I/O Refresh Timing....................................................................................................................5-79

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CJ2 CPU Unit Software User’s Manual

5-7 Index Registers...................................................................................................................... 5-84

5-7-1 What Are Index Registers?.......................................................................................................5-84

5-7-2 Using Index Registers...............................................................................................................5-84

5-7-3 Processing Related to Index Registers..................................................................................... 5-88

5-7-4 Monitoring Index Registers............................................ .. ... ............................................... ....... 5-89

5-7-5 Sharing Index and Data Registers between Tasks....................................................... ............ 5-90

5-8 Specifying Address Offsets.................................................................................................. 5-92

5-8-1 Overview...................................................................................................................................5-92

5-8-2 Examples of Address Offset Application................................................................................... 5-95

5-9 Checking Programs............................................................................................................... 5-96

5-9-1 Errors during CX-Programmer Input.........................................................................................5-96

5-9-2 Program Checks with the CX-Programmer............................................................................... 5-96

5-9-3 Debugging with the Simulator...................................................................................................5-97

5-9-4 Program Execution Check......................................................................................................5-100

5-10 Precautions.......................................................................................................................... 5-103

5-10-1 Condition Flags................................................................... ... ................................................. 5-103

5-10-2 Special Program Sections ...................................................................................................... 5-108

Section 6 I/O Memory Areas

6-1 I/O Memory Areas.................................................................................................................... 6-2

6-1-1 I/O Memory Area Overview........................................................................................................ 6-2

6-1-2 I/O Memory Area Structure......................................................................................................... 6-4

6-1-3 Holding I/O Memory Values........................................................................................................ 6-6

6-2 I/O Area..................................................................................................................................... 6-8

6-2-1 Input Bits.....................................................................................................................................6-8

6-2-2 Output Bits...................................... ............................................... ...........................................6-10

6-3 Data Link Area ....................................................................................................................... 6-13

6-4 Synchronous Data Refresh Area.......................................................................................... 6-14

6-5 CPU Bus Unit Area ............................... .... ... .......................................... ................................ 6-15

6-6 Special I/O Unit Area ............................................................................................................. 6-16

6-7 Serial PLC Link Area ............................................................................................................. 6-17

6-8 DeviceNet Area ......................... .......................................... ......................................... .......... 6-18

6-9 Work Area............................................................................................................................... 6-19

6-10 Holding Area .......................................................................................................................... 6-20

6-11 Auxiliary Area ........................................................................................................................ 6-22

6-12 Temporary Relay Area...........................................................................................................6-23

6-13 Data Memory Area................................................................................................................. 6-24

6-14 Extended Data Memory Area................................................... .......................................... ... 6-27

6-15 Timer Areas............................................................................................................................ 6-31

6-16 Counter Areas........................................................................................................................ 6-33

6-17 Task Flags .............................................................................................................................. 6-34

6-18 Index Registers...................................................................................................................... 6-35

6-19 Data Registers ....................................................................................................................... 6-40

6-20 Condition Flags ..................................................................................................................... 6-42

6-21 Clock Pulses .......................................................................................................................... 6-44

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CJ2 CPU Unit Software User’s Manual

Section 7 File Operations

7-1 File Memory.............................................................................................................................. 7-2

7-1-1 Types of File Memory..................................................... .............................................................7-2

7-1-2 Initializing File Memory ...............................................................................................................7-3

7-1-3 Memory Card Precautions ..........................................................................................................7-5

7-2 Types of Files Stored in File Memory .................................................................................... 7-7

7-2-1 File Types................................................... .................................................................................7-7

7-2-2 Creating and Saving Files for File Memory...............................................................................7-10

7-3 File Memory Operations........................................................................................................7-11

7-3-1 Types of File Memory Operations .................................. ...........................................................7-11

7-3-2 File Memory Operating Procedures and File Memory Files......................................................7-13

7-3-3 Restrictions on File Use............................................................................................................7-19

7-3-4 File Sizes........................... ... ............................................... ......................................................7-20

7-3-5 Relation between Support Software and File Memory Files.....................................................7-21

Section 8 I/O Allocations and Unit Settings

8-1 I/O Allocations ......................................................................................................................... 8-2

8-1-1 I/O Allocations.............................................................................................................................8-2

8-1-2 Automatic Allocation....................................................................................................................8-5

8-1-3 Manual Allocation........................................................................................................................8-9

8-1-4 I/O Table Errors and Precautions ..............................................................................................8-17

8-2 Setting CPU Bus Units and Special I/O Units ........... ... ... .... ......................................... .......8-20

8-2-1 Setting Parameters............................ ... .. ..................................................................................8-20

8-2-2 Data Exchange........................ .. ................................................................................................8-24

Section 9 PLC Setup

9-1 Overview of the PLC Setup..................................................................................................... 9-2

9-2 PLC Setup Settings ................................................................................................................. 9-4

9-3 PLC Setup Settings ................................................................................................................. 9-5

9-3-1 Startup Operation Settings..........................................................................................................9-5

9-3-2 CPU Unit Settings.......................................................................................................................9-8

9-3-3 Timings/Synchronous Settings..................................................................................................9-14

9-3-4 Special I/O Unit Cyclic Refreshing............................................................................................9-19

9-3-5 Basic I/O Unit Rack Response Times.......................................................................................9-21

9-3-6 Serial Port Settings...................................................................................................................9-23

9-3-7 Peripheral Service.....................................................................................................................9-30

9-3-8 FINS Protection.........................................................................................................................9-31

Section 10 CPU Unit Functions

10-1 Clock Functions..................................................................................................................... 10-3

10-1-1 Clock Functions......................... ................................................................................................10-3

10-1-2 Times Stored in Memory...........................................................................................................10-4

10-1-3 Free-running Timers..................................................................................................................10-6

10-2 Cycle Time/High-speed Processing..................................................................................... 10-7

10-2-1 Minimum Cycle Time.................................................................................................................10-7

10-2-2 Maximum Cycle Time.................................... ... ... ......................................................................10-8

10-2-3 Monitoring the Cycle Time ........................................................................................................10-9

10-2-4 High-speed Inputs.....................................................................................................................10-9

10-2-5 Background Execution............................................................................................................10-10

10-2-6 High-speed Interrupt Function ................................................................................................10-19

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CJ2 CPU Unit Software User’s Manual

10-3 Startup Settings and Maintenance..................................................................................... 10-22

10-3-1 Holding Settings for Operating Mode Changes and at Startup............................................... 10-22

10-3-2 Power OFF Detection Delay Setting....................................................................................... 10-24

10-3-3 Disabling Power OFF Interrupts..............................................................................................10-25

10-3-4 RUN Output............................................................................................................................ 10-26

10-3-5 Automatic Transfer at Startup ................................................................................................. 10-27

10-4 Unit Management Functions ...................... ........................................................................ 10-35

10-4-1 Basic I/O Unit Management................................................................. ...................................10-35

10-4-2 CPU Bus Unit Flags/Bits......................................................................................................... 10-37

10-4-3 Special I/O Unit Flags/Bits..................................................... ... ... ...........................................10-38

10-5 Memory Management Functions........................................................................................ 10-39

10-5-1 Automatic Backup.............................................................................................. ..................... 10-39

10-5-2 EM File Memory Functions.......................................................... .. ... ... ...................................10-41

10-5-3 Comment Memory.................................................................................................................. 10-42

10-5-4 Replacing the Entire Program during Operation..................................................................... 10-43

10-6 Security Functions.............................................................................................................. 10-50

10-6-1 Write-protection Using the DIP Switch ...................................................................................10-50

10-6-2 Read Protection Using Passwords .........................................................................................10-50

10-6-3 Program Operation Protection Using Production Lot Numbers..............................................10-55

10-6-4 Write Protection from FINS Commands ................................................................................. 10-56

10-6-5 PLC Names ............................................................................................................................10-60

10-7 Debugging............................................................................................................................ 10-63

10-7-1 Forced Set/Reset................................................................... ... .............................................. 10-63

10-7-2 Test Input................................................................................................................................ 10-64

10-7-3 Differential Monitoring.............................................................................................................10-64

10-7-4 Online Editing .........................................................................................................................10-65

10-7-5 Turning OFF Outputs........... .. ...................................................... .. ... ... ...................................10-67

10-7-6 Tracing Data............................................................................................................................10-68

10-7-7 Storing the Stop Position at Errors ......................................................................................... 10-73

10-7-8 Failure Alarm Instructions....................................................................................................... 10-74

10-7-9 Simulating System Errors............... ... .. ... ..................................................... ... ... ... .................. 10-75

10-7-10 Failure Point Detection............................................................................................................ 10-76

10-8 Synchronous Unit Operation.............................................................................................. 10-78

10-8-1 Overview................................................................................................................................. 10-78

10-8-2 Details on Synchronous Unit Operation..................................................................................10-81

10-8-3 Synchronous Unit Operation Specifications ........................................................................... 10-84

10-8-4 Synchronous Data Refresh..................................................................................................... 10-85

10-8-5 Restrictions in Using Synchronous Unit Operation................................................................. 10-89

10-8-6 Application Procedure............................................................................................................. 10-91

10-8-7 PLC Setup ..............................................................................................................................10-92

10-8-8 Writing the Synchronous Interrupt Task.................................................................................. 10-94

10-8-9 Adjusting and Troubleshooting Synchronous Unit Operation .................................................10-95

Section 11 Programming Devices and Communications

11-1 Accessing a PLC from the CX-Programmer........................................................................ 11-2

11-1-1 Overview................................................................................................................................... 11-2

11-1-2 System Configurations for Accessible PLCs............................................................................. 11-4

11-1-3 Accessing a PLC from the CX-Programmer............................................................................. 11-8

11-1-4 Automatic Online Connection......... ... .....................................................................................11-11

11-2 Serial Communications.. ... ... .... ... .......................................... .......................................... .... 11-15

11-2-1 Overview of Serial Communications....................................................................................... 11-15

11-3 Communications Networks ................................................................................................ 11-29

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CJ2 CPU Unit Software User’s Manual

Section 12 CPU Unit Cycle Time

12-1 Monitoring the Cycle Time.................................................................................................... 12-2

12-1-1 Monitoring the Cycle Time ........................................................................................................12-2

12-2 Computing the Cycle Time ...................................................................................................12-4

12-2-1 CPU Unit Operation Flowchart..................................................................................................12-4

12-2-2 Cycle Time Overview........ ... ... .. ...................................................... .. ... ... ..................................12-5

12-2-3 I/O Unit Refresh Times for Individual Units...............................................................................12-7

12-2-4 Cycle Time Calculation Exampl e............................................................................................12-11

12-2-5 Online Editing Cycle Time Extension......................................................................................12-13

12-2-6 I/O Response Time.................................................................................................................12-13

12-2-7 Response Time for Built-in Input Interrupts.............................................................................12-14

12-2-8 Response Performance of Serial PLC Links...........................................................................12-15

Appendices

A-1 Instruction Functions..............................................................................................................A-3

A-1-1 Sequence Input Instructions .......................................................................................................A-3

A-1-2 Sequence Output Instructions..................................... ... ..................................................... ........A-5

A-1-3 Sequence Control Instructions...................................................................... .. ... .........................A-6

A-1-4 Timer and Counter Instructions.................................................................................................A-10

A-1-5 Comparison Instructions ...........................................................................................................A-14

A-1-6 Data Movement Instructions ............................................. .. ... .............................................. .....A-18

A-1-7 Data Shift Instructions.............................................................................................. .................A-20

A-1-8 Increment/Decrement Instructions............................................................................................A-24

A-1-9 Symbol Math Instructions............................................ ... ...........................................................A-24

A-1-10 Conversion Instructions.............................................................................................................A-29

A-1-11 Logic Instructions......................................................................................................................A-35

A-1-12 Special Math Instructions..........................................................................................................A-37

A-1-13 Floating-point Math Instructions................................................................................................A-38

A-1-14 Double-precision Floating-point Instructions.............................................................................A-42

A-1-15 Table Data Processing Instructions...........................................................................................A-45

A-1-16 Tracking Instructions.................................................................................................................A-49

A-1-17 Data Control Instructions ....................................................... ... ... .............................................A-50

A-1-18 Subroutine Instructions .............................. ...............................................................................A-54

A-1-19 Interrupt Control Instructions.....................................................................................................A-55

A-1-20 Step Instructions .......................................................................................................................A-56

A-1-21 Basic I/O Unit Instructions.........................................................................................................A-56

A-1-22 Serial Communications Instructions..........................................................................................A-59

A-1-23 Network Instructions .................................................................................................................A-61

A-1-24 File Memory Instructions................................................ ... .. ......................................................A-63

A-1-25 Display Instructions............................................... ... ... ..............................................................A-64

A-1-26 Clock Instructions........................................................... ... ........................................................A-65

A-1-27 Debugging Instructions........................... ..................................................................................A-66

A-1-28 Failure Diagnosis Instructions...................................................................................................A-66

A-1-29 Other Instructions......................................................................................................................A-67

A-1-30 Block Programming Instructions...............................................................................................A-68

A-1-31 Text String Processing Instructions...........................................................................................A-72

A-1-32 Task Control Instructions...........................................................................................................A-75

A-1-33 Model Conversion Instructions..................................................................................................A-75

A-1-34 Special Function Block Instructions..........................................................................................A-76

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CJ2 CPU Unit Software User’s Manual

A-2 Instruction Execution Times and Number of Steps ...........................................................A-78

A-2-1 Sequence Input Instructions.....................................................................................................A-79

A-2-2 Sequence Output Instructions ..................................................................................................A-79

A-2-3 Sequence Control Instructions .................................................................................................A-80

A-2-4 Timer and Counter Instructions ................................................................................................A-81

A-2-5 Comparison Instructions...........................................................................................................A-82

A-2-6 Data Movement Instructions.....................................................................................................A-83

A-2-7 Data Shift Instructions ..............................................................................................................A-84

A-2-8 Increment/Decrement Instructions............................................................................................A-85

A-2-9 Symbol Math Instructions .........................................................................................................A-85

A-2-10 Conversion Instructions....... .....................................................................................................A-87

A-2-11 Logic Instructions......................................................................................................................A-89

A-2-12 Special Math Instructions.........................................................................................................A-89

A-2-13 Floating-point Math Instructions ...............................................................................................A-89

A-2-14 Double-precision Floating-point Instructions............................................................................. A-91

A-2-15 Table Data Processing Instructions......................... .................................................................A-92

A-2-16 Tracking Instructions.................................................................................................................A-94

A-2-17 Data Control Instructions..........................................................................................................A-94

A-2-18 Subroutine Instructions.............................................................................................................A-95

A-2-19 Interrupt Control Instructions ....................................................................................................A-95

A-2-20 Step Instructions.......................................................................................................................A-96

A-2-21 Basic I/O Unit Instructions ........................................................................................................A-96

A-2-22 Serial Communications Instructions .........................................................................................A-97

A-2-23 Network Instructions.................................................................................................................A-98

A-2-24 File Memory Instructions ..........................................................................................................A-98

A-2-25 Display Instructions................................. ... ..................................................... ... ... ... .................A-98

A-2-26 Clock Instructions .............................. .. ... ... ...............................................................................A-98

A-2-27 Debugging Instructions.............................................................................................................A-99

A-2-28 Failure Diagnosis Instructions...................................................................................................A-99

A-2-29 Other Instructions..................... ................................................ ..............................................A-100

A-2-30 Block Programming Instructions.............................................................................................A-100

A-2-31 Text String Processing Instructions.........................................................................................A-102

A-2-32 Task Control Instructions.............................. ... ..................................................... ... ... .. .. ........A-103

A-2-33 Model Conversion Instructions...............................................................................................A-103

A-2-34 Special Function Block Instructions........................................................................................A-103

A-2-35 SFC Instructions......................................................... ... .........................................................A-103

A-2-36 Function Block Instance Execution Time................................................................................A-104

A-3 Auxiliary Area ......................................................................................................................A-106

A-3-1 Read-only Area (Set by System)............................................................................................A-106

A-3-2 Read/Write Area (Set by User)...............................................................................................A-129

A-3-3 Details on Auxiliary Area Operation............................................. ...........................................A-138

A-4 Memory Map of PLC Memory Addresses..........................................................................A-141

A-4-1 PLC Memory Addresses.........................................................................................................A-141

A-4-2 Memory Map...........................................................................................................................A-142

A-5 Ope ra ti on for Power Interruptions ............................................................................. ........A-143

A-5-1 Power OFF Operation.............................................................................................................A-143

A-5-2 Instruction Execution for Power Interruptions .........................................................................A-145

A-6 EtherNet/IP Connections from Windows XP (SP2 or Higher) or Windows Vista...........A-147

A-6-1 Changing Windows Firewall Settings......................................................................................A-147

A-7 PLC Comparison Charts: CJ-series and CS-series PLCs ...............................................A-150

A-8 Functions Supported for Unit Versions.............................................................................A-154

Index ................................................................................................................Index-1

Revision History .......................................................................................Revision-1

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CJ2 CPU Unit Software User’s Manual

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CJ2 CPU Unit Software User’s Manual

Read and Understand this Manual

Please read and understand this manual be f ore using the product. Please consult your OMRON representative
if you have any questions or comments.

Warranty and Limitations of Liability

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a
period of one year (or other period if specified) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTA TION, EXPRESS OR IMPLIED, REGARDING NON­INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE
PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.

In no event shall the responsibility of OMR ON f or any act e xceed the individual price of the product on which
liability is asserted.

IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS
REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS
WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO
CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

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CJ2 CPU Unit Software User’s Manual

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the
combination of products in the customer's application or use of the products.

At the customer's request, OMRON will provide applicable third party certification documents identifying
ratings and limitations of use that apply to the products. This information by itself is not sufficient for a
complete determination of the suitability of the products in combination with the end product, machine,
system, or other application or use.

The following are some examples of applications for which particular attention must be given. This is not
intended to be an exh austive list of all possible uses of the products , nor is it inte nded to imply that the uses
listed may be suitable for the products:

• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or
uses not described in this manual.

• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical
equipment, amusement machines, vehicles, safety equipment, and installations subject to separate
industry or government regulations.

• Systems, machines, and equipment that could present a risk to life or property.

Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR

PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO
ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND
INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

PROGRAMMABLE PRODUCTS

OMRON shall not be responsible for the user's programming of a programmable product, or any
consequence thereof.

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CJ2 CPU Unit Software User’s Manual

Disclaimers

CHANGE IN SPECIFICATIONS

Product specifications and accessories may be changed at any time based on improvements and other
reasons.

It is our practice to change model numbers when published ratings or features are changed, or when
significant construction changes are made. However, some specifications of the products may be changed
without any notice. When in doub t, special model numbers may be assigned to fix or establish key
specifications for your application on your request. Please consult with your OMRON representative at any
time to confirm actual specifications of purchased products.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when
tolerances are shown.

PERFORMANCE DATA

Perf ormance data given in this manual is provided as a guide for the user in determining suitability and does
not constitute a warranty. It may represent the result of OMRON's test conditions, and the users must
correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and
Limitations of Liability.

ERRORS AND OMISSIONS

The information in this manual has been carefully checked and is believed to be accurate; however, no
responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

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CJ2 CPU Unit Software User’s Manual

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CJ2 CPU Unit Software User’s Manual

Safety Precautions

The following notation is used in this manual to provide precautions required to ensure safe usage of a
CJ-series PLC. The saf e t y pre c aution s that a re pr ovided are extremely important to safety. Always read
and heed the information provided in all safety precautions.

Definition of Precautionary Information

WARNING

Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury. Additionally, there may be
severe property damage.

Caution

Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury, or property damage.

Precautions for Safe Use

Indicates precautions on what to do and what not to do to ensure using the product safely.

Precautions for Correct Use

Indicates precautions on what to do and what not to do to ensure proper operation and perf ormance.

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CJ2 CPU Unit Software User’s Manual

Symbols

The triangle symbol indicates precautions (including warnings).
The specific operation is shown in the triangle and explained in
text. This example indicates a precaution for electric shock.

The circle and slash symbol indicates operations that you must
not do. The specific operation is shown in the circle and
explained in text.

The filled circle symbol indicates operations that you must do.
The specific operation is shown in the circle and explained in
text. This example shows a general precaution for something
that you must do.

The triangle symbol indicates precautions (including warnings).
The specific operation is shown in the triangle and explained in
text. This example indicates a general precaution.

The triangle symbol indicates precautions (including warnings).
The specific operation is shown in the triangle and explained in
text. This example indicates a precaution for hot surfaces.

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CJ2 CPU Unit Software User’s Manual

WARNING

Do not attempt to take any Unit apart or touch the inside of any Unit while the
power is being supplied. Doing so may result in electric shock.

Do not touch any of the t erminals or t erminal blocks while the pow er is be ing
supplied. Doing so may result in electric shock.

Provide safety measures in external circuits (i.e., not in the Programmable
Controller), including the following items, to ensure safety in the system if an
abnormality occurs due to malfunction of the Programmable Controller or
another external factor affecting the operation of the Programmable Control­ler. "Programmab le Controller" indicates the CPU Unit and all other Units and
is abbreviated "PLC" in this manual. Not doing so may result in serious acci­dents.

• The PLC will turn OFF all outputs when its self-diagnosis fu nction detects
any error or when a severe failure alarm (FALS) instruction is executed.
Unexpected operation, however, may still occur for errors in the I/O control
section, errors in I/O memory, and other errors that cannot be detected by
the self-diagnosis function. As a countermeasure for all such errors, exter­nal safety measures must be provided to ensure safety in the system.

• The PLC outputs may remain ON or OFF due to deposition or burning of
the output relays or destruction of the output transistors. As a countermea­sure for such problems, external safety measures must be provided to
ensure safety in the system.

• Provide measures in the computer system and programming to ensure
safety in the over all system even if communications errors or malfunctions
occur in data link communications or remote I/O communications.

Confirm safety before transferring data files stored in the file memory (Mem­ory Card or EM file memory) to the I/O area (CIO) of the CPU Unit using a
peripheral tool. Otherwise, the devices connected to the output unit may mal­function regardless of the operation mode of the CPU Unit.

Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal
lines, momentary power interruptions, or other causes. Serious accidents
may result from abnormal operation if proper measures are not provided.

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CJ2 CPU Unit Software User’s Manual

Caution

Execute online edit only after confirming that no adverse effects will be
caused by extending the cycle time. Otherwise, the input signals may not be
readable.

Confirm safety at the destination node before transferring a program, PLC
Setup, I/O tables, I/O memory contents, or parameters to another node or
changing contents of the any of these items. Transferring or changing data
can result in unexpected system operation.

The CJ2 CPU Units automatically back up the user program and parameter
data to flash memory when these are written to the CPU Unit. I/O memory
including the DM, EM, and Holding Areas), however , is not written to flash
memory.

The DM, EM, and Holding Areas can be held during power interruptions with
a battery. If there is a battery error, the contents of these areas may not be
accurate after a power interruption. If the contents of the DM, EM, and Hold­ing Areas are used to control external outputs, prevent inappropriate outputs
from being made whenever the Battery Error Flag (A402.04) is ON.

Tighten the terminal screws on the AC Power Supply Unit to the torque spec­ified in the operation manual. The loose screws may result in burning or mal­function.

Do not touch the Power Supply Unit when power is being supplied or immedi­ately after the power supply is turned OFF. The Pow er Supply Unit will be hot
and you may be burned.

When connecting a personal computer or other peripheral device to a PLC to
which a non-insulated Power Supply Unit (CJ1W-PD022) is mounted, either
ground the 0 V side of the external power supply or do not ground the exter­nal power supply at all ground. A short-circuit will occur in the external power
supply if incorrect grounding methods are used. Never ground the 24 V side,
as shown below.

24 V

0 V

FG

CPU Unit

0 V

Wiring in Which the 24-V Power Supply Will Short

Non-insulated
DC power supply

Power Supply
Unit

Peripheral
cable

Peripheral device (e.g.,
personal computer)

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CJ2 CPU Unit Software User’s Manual

Application Precautions

Observe the following precautions when using a CJ-series PLC.

z Power Supply

• Always use the power supply voltages specified in the user’s manuals. An incorrect voltage may
result in malfunction or burning.

• Exceeding the capacity of the Power Supply Unit may prevent the CPU Unit or other Units from
starting.

• Take appropriate measures to ensure that the specified power with the rated voltage and fre­quency is supplied. Be particularly careful in places where the power supply is unstable. An incor­rect power supply may result in malfunction.

• Always turn OFF the power supply to the PLC before attempting any of the following. Not turning
OFF the power supply may result in malfunction or electric shock.

• Mounting or dismounting Power Supply Units, I/O Units, CPU Units, Option Boards, or any
other Units.

• Assembling the Units.

• Setting DIP switches or rotary switches.

• Connecting cables or wiring the system.

• Connecting or disconnecting the connectors.

• When cross-wiring ter minals, the total current for all the ter minal will flow in the wire. Make sure
that the current capacity of the wire is sufficient.

• Observe the following precautions when using a Power Supply Unit that supports the Replace­ment Notification Function.

• Replace the Power Supply Unit within six months if the display on the front of the Power Sup­ply Unit alternates between 0.0 and A02, or if the alarm output automatically turns OFF.

• Keep the alarm output cable separated from power line and high-voltage lines.

• Do not apply a voltage or connect a loa d exceeding the specifications to the alarm output.

• When storing the Power Supply Unit for more than three months, store it at −20 to 30°C and
25% to 70% humidity to preserve the Replacement Notification Function.

• If the Po wer Supply Unit is not installed properly, heat buildup may cause the replacement noti­fication signal to appear at the wrong time or may cause interior elements to deteriorate or
become damaged. Use only the standard installation method.

• Do not touch the terminals on the Power Supply Unit immediately after turning OFF the power
supply. Residual voltage may cause electrical shock.

• Observe the following precautions to prevent failure due to difference in electrical potential if the
computer is connected to the PLC.

• Before connecting a laptop computer to the PLC, disconnect the power supply plug of the
computer from the AC outlet. Residual curr ent in th e AC adaptor may cause diff erence in elec­trical potential to occur between the computer and the PLC. After you connect the computer
and PLC, supply the power again from the AC adaptor.

• If the computer has an FG terminal, make the connections so that it has the same electrical
potential as the FG (GR) terminal on the PLC.

• If the computer is grounded to a separate location, difference in electrical potential may occur
depending on the grounding conditions.

z Installation

• Do not install the PLC near sources of strong high-frequency noise.

• Before touching a Unit, be sure to first touch a grounded metallic object in order to discharge any
static build-up. Not doing so may result in malfunction or damage.

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CJ2 CPU Unit Software User’s Manual

• Be sure that the terminal blocks, connectors, Memory Cards, Option Boards, expansion cables,
and other items with locking devices are properly locked into place . Impr oper locking may result in
malfunction.

• The sliders on the tops and bottoms of th e Power Supply Unit, CPU Unit, I/O Units, Special I/O
Units, and CPU Bus Units must be completely locked (until they click into place) after connecting
to adjacent Units. The Unit may not operate properly if the sliders are not locked in place. It may
not be possible to achieve proper functionality if the sliders are not locked.

z Wiring

• Follow the instructions in this manual to correctly perform wiring.

• Double-check all wiring and switch settings before turning ON the power supply. Incorrect wiring
may result in burning.

• Be sure that all terminal screws, and cable connector screws are tightened to the torque specified
in the relevant manuals. Incorrect tightening torque may result in malfunction.

• Mount terminal blocks and connectors only after checking the mounting location carefully.

• Leave the label attached to the Unit when wiring. Removing the label may result in malfunction if
foreign matter enters the Unit.

• Remove the label after the completion of wiring to ensure prope r heat dissipation. Leaving the
label attached may result in malfunction.

• Use crimp terminals for wiring. Do not connect bare stranded wires directly to terminals. Connec­tion of bare stranded wires may result in burning.

• Do not apply voltages to the Input Units in excess of the rated input voltage. Excess voltages may
result in burning.

• Always connect to a g ro und of 100 Ω or less when installing the Units . Not connecting to a g round
of 100 Ω or less may result in electric shock.
A ground of 100 Ω or less must be installed when shorting the GR and LG terminals on the Power
Supply Unit.

• Do not apply voltages or connect loads to the Output Units in excess of the maximum switching
capacity. Excess voltage or loads may result in burning.

• Do not pull on the cables or bend the cables beyond their natural limit. Doing either of these may
break the cables.

• Do not place objects on top of the cables or other wiring lines. Doing so may break the cables.

• Do not use commercially available RS-232C personal computer cables. Always use the special
cables listed in this manual or make cables according to manual specifications. Using commer­cially availab le cables may damage the external devices or CPU Unit.

• Never con nect p i n 6 (5- V p o wer supply) on the RS-232C port on the CPU Unit to any device other
than an NT-AL001 Link Adapter, CJ1W-CIF11 Converter, and Programmable Terminals (NV3W­M@20L). The external device or the CPU Unit may be damaged.

z Handling

• The Po wer Supply Unit may possibly be damaged if the entire voltage for a dielectric strength test
is applied or shut OFF suddenly using a switch. Use a variable resistor to gradually increase and
decrease the voltage.

• Separate the line ground terminal (LG) from the functional ground terminal (GR) on the Power
Supply Unit before performing withstand voltage tests or insulation resistance tests. Not doing so
may result in burning.

• Make sure that the DIP switches and DM Area are set correctly before starting operation.

• After replacing the CPU Unit, a Special I/O Unit, or a CPU Bus Unit, make sure that the required
data for the DM Area, Holding Area, and other memory areas has been transferred to the new
Unit before restarting operation.

• Confirm that no adverse effect will occur in the system before attempting any of the following. Not
doing so may result in an unexpected operation.

• Changing the operating mode of the PL C (i ncluding the set ting of t he st artup operating mod e).

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CJ2 CPU Unit Software User’s Manual

• Force-setting/force-resetting any bit in memory.

• Changing the present value of any word or any set value in memory.

• Do not attempt to disassemble, repair, or modify any Units . Any atte mpt to do so ma y result in mal­function, fire, or electric shock.

• Do not drop the PLC or subject abnormal vibration or shock to it.

• The life of the battery will be reduced if the PLC is left for a period of time without a battery
installed and without power supply, and then a battery is installed without turning ON the power
supply.

• Replace the battery as soon as a battery error occurs or as soon as the specified battery backup
time expires. Be sure to install a replacement battery within two years of the production date
shown on the battery's label.

• Before replacing the battery, turn ON power for at least 5 minutes before starting t he re p lac ement
procedure and complete replacing the battery within 5 minutes of turning OFF the power supply.
Memory contents may be corrupted if this precaution is not obeyed.

• If the Battery Error Flag is used in programming the application, confirm system safety even if the
system detects a battery error before you replace the battery while the power is ON.

• Do not shor t the batter y ter mina ls or charge, disassem ble, heat, or incinerate the batter y. Do not
subject the battery to strong shocks. Doing any of these may result in leakage, rupture, heat gen­eration, or ignition of the batte ry. Dispose of any battery that has been dropped on the f loor o r oth­erwise subjected to excessive shock. Batteries that have been subjected to shock may leak if they
are used.

• UL standards require that only an experienced engineer can replace the battery. Make sure that
an experienced engineer is in charge of battery replacement. Follow the procedure for battery
replacement given in this manual.

• Dispose of the product and batterie s according to local ordinances as they apply.

• If the I/O Hold Bit is turned ON, the outputs from the PLC will not be turned OFF and will maintain
their previous status when the PLC is switched from RUN or MONITOR mode to PROGRAM
mode. Make sure that the external loads will not produce dangerous conditions when this occurs.
(When operation stops for a fatal error, including those produced with the FALS(007) instruction,
all outputs from Output Unit will be turned OFF and only the inter nal output status will be main­tained.)

• Unexpected operation may result if inappropriate data link tables or parameters are set. Even if
appropriate data link tables and parameters have been set, confirm that the controlled system will
not be adversely affected before starting or stopping data links.

• Write programs so that any data that is received for data link communications is used only if there
are no errors in the CPU Units that are the sour ces of the data. Use the CPU Unit error informa­tion in the status flags to check for errors in the source CPU Units. If there are errors in source
CPU Units, they may send incorrect data.

• All CPU Bus Units will be restarted when routing tables are transferred from a Programming
Device to the CPU Unit. Restarting these Units is required to read and enable the new routing
tables. Confirm that the system will not be adversely affected before transferring the routing
tables.

• Tag data links will stop between related nodes while tag data link parameters are being trans­ferred during PLC operation. Confirm that the system will not be adversely affected before trans­ferring the tag data link parameters.

• If there is interference with network communications, output status will depend on the de vices that
are being used. When using devices with outputs, confirm the operation that will occur when there
is interference with communications, and implement safety measures as required.

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CJ2 CPU Unit Software User’s Manual

• When creating an AUTOEXEC.IOM file from a Programming Device (a Programming Console or
the CX-Programmer) to automatically transfer data at startup, set the first write address to
D20000 and be sure that the size of data written does not exceed the size of the DM Area. When
the data file is read from the Memory Card at startup, data will be written in the CPU Unit starting
at D20000 even if another address was set when the AUTOEXEC.IOM file was created. Also, if
the DM Area is exceeded (which is possible when the CX-Programmer is used), the remaining
data will be written to the EM Area.

• The user program and parameter area data in the CJ2 CPU Units are backed up in the built-in
flash memory. The BKUP indicator will light on the front of the CPU Unit when the backup opera­tion is in progress. Do not turn OFF the power supply to the CPU Unit when the BKUP indicato r is
lit. The data will not be backed up if power is turned OFF.

• Check the user program and Unit parameter settings for proper execution before actually running
them on the Unit. Not checking the program and parameter settings may result in an unexpected
operation.

• When setting a Special I/O Unit or CPU Bus Unit in the I/O ta bles, carefully check the safety of the
devices at the connection t arget before restarting the Unit.

• Do not turn OFF the power supply to the PLC when reading or writing a Memory Card. Also, do
not remove the Memory Card when the BUSY indicator is lit. Doing so may make the Memory
Card unusable.
To remove a Memory Card, first press the memory card power supply switch and then wait for the
BUSY indicator to go out before removing the Memory Card.

• When restoring data, carefully check that the selected data is the correct data to be restored
before executing the restore operation. Depending on the contents of the selected data, the con­trol system may operate unexpectedly after the data is restored.

• Some Special I/O Units and CPU Bus Units operate with parameters stored in the CPU Unit (e.g.,
words allocated in DM Area, data link tables, or Ethernet settings). Information on restrictions will
be displayed in the Information Area in the PLC Backup Tool if there are any restrictions for the
selected CPU Bus Unit or Special I/O Unit. Check the r estrictions, and then be sure to select both
the CPU Unit and the CPU Bus Unit or Special I/O Unit when backing up or restoring data. The
control system may operate unexpectedly if the equipment is started with the data backed up or
restored without selecting both Units.

• Information on restrictions will be displayed in the Information Area in the PLC Backup Tool if the
data to be stored includes a Unit that has r est rictions on backup. Check the in formation on restric­tions and take the required countermeasures. The control system may operate unexpectedly
when the equipment is operated after the data is restored

• Before restoring data during PLC operation, be sure that there will be no problem if PLC operation
stops. If the PLC stops at an unexpected time, the control system may oper ate unexpectedly.

• Be sure to turn the PLC power supply OFF and then back ON after restoring data. If the power is
not reset, the system may not be updated with the restored data, and the control system may
operate unexpectedly.

• Data on forced status can be ba cked up but it cannot be restor ed . Perform the procedure to force­set or force-reset bits from the CX-Programmer as required before starting operation after restor­ing data that includes forced status. Depending on the difference in the forced status, the control
system may operate unexpectedly.

• If a symbol or memory address (only symbols are allowed f or ST pr ogr amming) is specified f or t he
suffix of an array variable in ladder or ST programming , be sure that the specified elem ent nu mber
does not exceed the maximum memory area range.
Specifying an element number that exceeds the maximum rang e of t he me mory area specified for
the symbol will result accessing data in a different memory area, and may result in unexpected
operation.

• If a symbol or address is specified for an offset in a ladder diagram, program so that the memory
area of the start address is not exceeded when the offset is specified indirectly using a word
address or symbol.
If an indirect specification causes the address to exceed the are a of the start address, the system
will access data in other area, and unexpected operation may occur.

29

CJ2 CPU Unit Software User’s Manual

z External Circuits

• Always turn ON power to the PLC before turning ON power to the control system. If the PLC
power supply is turned ON after the cont rol power supply, temporary errors may result in control
system signals because the output terminals on DC Output Units and other Units will momentarily
turn ON when power is turned ON to the PLC.

• Install external breakers and tak e ot her safety measures against short-circuiting in external wiring.
Insufficient safety measures against short-circuiting may result in burning.

30

CJ2 CPU Unit Software User’s Manual

Operating Environment Precautions

z Follow the instructions in this manual to correctly perform installation.

z Do not operate the control system in the following locations:

• Locations subject to direct sunlight.

• Locations subject to temperatures or humidity outside the range specified in the specifications.

• Locations subject to condensation as the result of severe changes in temperature.

• Locations subject to corrosive or flammable gases.

• Locations subject to dust (especially iron dust) or salts.

• Locations subject to exposure to water, oil, or chemicals.

• Locations subject to shock or vibration.

z Take appropriate and sufficient countermeasures when installing systems in the

following locations:

• Locations subject to static electricity or other forms of noise.

• Locations subject to strong electromagnetic fields.

• Locations subject to possible exposure to radioactivity.

• Locations close to power supplies.

31

CJ2 CPU Unit Software User’s Manual

Regulations and Standards

• EMC Directives

• Low Voltage Directive

z EMC Directives

OMRON devices that comply with EC Directives also conform to the related EMC standards so that
they can be more easily built into other devices or the overall machine. The actual pr oducts have
been checked for conformity to EMC standards (see the following note). Whether the products con­form to the standards in the system used by the customer, however, must be checked by the cus­tomer.

EMC-related performance of the OMRON devices that comply with EC Directives will vary depend­ing on the configuration, wiring, and other conditions of the equipment or control panel on which the
OMRON dev ices are installed.

The customer must, therefore, perform the final check to confirm that devices and the overall
machine conform to EMC standards.

* Applicable EMC (Electromagnetic Compatibility) standards are as follows:

EMS (Electromagnetic Susceptibility):
CS Series: EN 61131-2 and EN 61000-6-2
CJ Series: EN 61000-6-2

* EMI (Electromagnetic Interference):

EN 61000-6-4 (Radiated emission: 10-m regulations)

z Low Voltage Directive

Always ensure that devices operating at voltages of 50 to 1,000 VAC and 75 to 1,500 VDC meet the
required safety standards for the PLC (EN 61131-2).

z Conformance to EC Directives

The CJ-series PLCs comply with EC Directives. To ensure that the machine or device in which the
CJ-series PLC is used complies with EC Directives, the PLC must be installed as follows:

• The CJ-series PLC must be installed within a control panel.

• You must use reinforced insulation or double insulation for the DC power supplies connected to
DC Power Supply Units and I/O Units.

• CJ-series PLCs complying with EC Directives also conform to the Common Emission Standard
(EN 61000-6-4). Radiated emission characteristics (10-m re gu lat ion s) may vary depending on the
configuration of the control panel used, other devices connected to the control panel, wiring, and
other conditions. You must therefore confirm that the overall machine or equipment complies with
EC Directives.

Conformance to EC Directives

Applicable Directives

Concepts

32

CJ2 CPU Unit Software User’s Manual

This product conforms to the following shipbuilding standards. Applicability to the shipbuilding stan­dards is based on certain usage conditions. It may not be possible to use the product in some loca­tions. Contact your OMRON representative before attempting to use a PLC on a ship .

z Usage Conditions for Applications Other Than on the Bridge or Deck

• The PLC must be installed in a control panel.

• Gaps in the door to the control panel must be completely filled or covered with gaskets or other
material.

z Usage Conditions for Bridge and Deck (Certified Only by NK)

• The PLC must be installed in a control panel.

• Gaps in the door to the control panel must be completely filled or covered with gaskets or other
material.

• The following noise filter must be connected to the power supply line.

Noise Filter

SYSMAC is a registered trademark for Programmable Controllers made by OMRON Corporation.
CX-One is a registered trademark for Programming Software made by OMRON Corporation.
Windows is a registered trademark of Microsoft Corporation.
Other system names and product names in this document are the tr a dem arks or registered trademarks

of their respective companies.

Conformance to Shipbuilding Standards

Usage Conditions for NK and LR Shipbuilding Standards

Manufacturer Cosel Co., Ltd.

Model TAH-06-683

Trademarks

33

CJ2 CPU Unit Software User’s Manual

Unit Versions of CJ2 CPU Units

A “unit version” has been introduce d to man age CJ2 CPU Un its a cco rd ing to dif ferences in functionality
accompanying version upgrades.

The unit version is given to the right of the lot number on the nameplate of the products for which unit
versions are being managed, as shown below.

CX-Programmer can be used to confirm the unit version using one of the following two methods.

• Using the PLC Information

• Using the Unit Manufacturing Information (This method can be u sed for Special I/O Units and CPU
Bus Units as well.)

z PLC Information

1 Use one of the following methods to display the PLC Information Dialog Box.

• If you know the device type and CPU type, select them in th e Ch ange PLC Dialog Box, go online,
and select PLC - Edit - Information from the menus.

• If you don't know the device type and CPU type, but are connected directly to the CPU Unit on a
serial line, select PLC - Auto Online to go online, and then select PLC - Edit - Information from
the menus.

Unit Versions

Notation of Unit Versions on Products

Confirming Unit Versions with Support Software

CJ2 CPU Unit

Lot No.

CJ2H-CPU68-EIP

CPU UNIT

Lot No. 090115 0008 CPU.Ver.1.1 EIP.Ver.1.1

OMRON Corporation MADE IN JAPAN

Indicates the unit version of
the CPU Unit (example: unit
version 1.1).

Indicates the unit version of
the built-in EtherNet/IP port
(CJ2H-CPU@@-EIP only)
(example: unit version 1.1).

34

CJ2 CPU Unit Software User’s Manual

2 In either case, the following PLC Information Dialog Box will be displayed.

Use the above display to confirm the unit version of the CPU Unit.

z Unit Manufacturing Information

1 In the IO Table Window, right-click and select Unit Manufacturing information - CPU Unit.

Unit version

35

CJ2 CPU Unit Software User’s Manual

2 The following Unit Manufacturing information Dialog Box will be displayed.

Use the above display to confirm the unit version of the CPU Unit connected online.

3 Using the Unit Version Labels

The following unit version labels are provided with the CPU Unit.

These labels can be attached to the front of previous CPU Units to differentiate between CPU
Units of different unit versions.

Unit version

Ver. 1.0

Ver. 1.0

36

CJ2 CPU Unit Software User’s Manual

The following tables show the relationship between unit versions and CX-Programmer versions. Refer
to A-8 Functions Supported for Unit Versions for the functions supported by each unit version.

z Unit Versions and Programming Devices

*1 It is not nece ssary to upgrade the version of the CX-Programmer if functionality that was enhanced for the

upgrade of the CPU Unit will not be used.

*2 CX-Programmer version 8.2 or higher is requ ired to use the functions added for unit version 1.1. The high-

speed interrupt function and changing the minimum cycle time setting in MONITOR mode, however, are also
supported by CX-Programmer version 8.02.

*3 A Programming Console cannot be used with a CJ2 CPU Unit.

Unit Versions

Item Models Unit version

CJ2H CPU Unit CJ2H-CPU6@-EIP Unit version 1.0 (Built-in EtherNet/IP section: Unit version 2.0)

Unit version 1.1 (Built-in EtherNet/IP section: Unit version 2.0)
Unit version 1.2 (Built-in EtherNet/IP section: Unit version 2.0)
Unit version 1.3 (Built-in EtherNet/IP section: Unit version 2.0)

CJ2H-CPU6@ Unit version 1.1

Unit version 1.2
Unit version 1.3

CJ2M CPU Unit

CJ2M-CPU3@ Unit version 1.0 (Built-in EtherNet/IP section: Unit version 2.0)
CJ2M-CPU1@ Unit version 1.0

Unit Versions and Programming Devices

CPU Unit Functions

Required Programming Device

CX-Programmer

Program-

ming Con-

sole

Ver. 7.1

or lower

Ver. 8.0

Ver. 8.2

or higher

Ver. 9.0

Ver. 9.1

or higher

CJ2H CJ2H-CPU6@-EIP

Unit version 1.0

Functions for unit version 1.0 --- OK OK OK OK

---

*3

CJ2H-CPU6@-EIP
Unit version 1.1

Functions
added for unit
version 1.1

Using new
functions

--- ---

OK

*2

OK OK

Not using new
functions

---

OK

*1

OK OK OK

CJ2H-CPU6@
Unit version 1.1

Functions
added for unit
version 1.1

Using new
functions

--- ---

OK

*2

OK OK

Not using new
functions

--- --- OK OK OK

CJ2H-CPU6@-EIP
Unit version 1.2

Functions
added for unit
version 1.2

Using new
functions

--- --- --- OK OK

Not using new
functions

---

OK

*1

OK

*1

OK OK

CJ2H-CPU6@
Unit version 1.2

Functions
added for unit
version 1.2

Using new
functions

--- --- --- OK OK

Not using new
functions

---

OK

*1

OK

*1

OK OK

CJ2H-CPU6@-EIP
Unit version 1.3

Functions
added for unit
version 1.3

Using new
functions

--- --- --- --- OK

Not using new
functions

---

OK

*1

OK

*1

OK OK

CJ2H-CPU6@
Unit version 1.3

Functions
added for unit
version 1.3

Using new
functions

--- --- --- --- OK

Not using new
functions

---

OK

*1

OK

*1

OK OK

CJ2M CJ2M-CPU@@ Unit

version 1.0

Functions for unit version 1.0 --- --- --- --- OK

37

CJ2 CPU Unit Software User’s Manual

z Pull-down List for PLC Models

Unit versions are not differentiated in the pull-down list for PLC models in the Change PLC Dialog
Box of the CX-Programmer. Select as shown in the following table regardless of the unit version.

Troubleshooting Problems with Unit Versions on the CX-Programmer

Series CPU Unit Model number

PLC model in Change PLC Dialog Box in CX-Programmer ver-

sion 9.0 or higher

CJ Series CJ2H CPU Unit CJ2H-CPU6@-EIP

CJ2H-CPU6@

CJ2H

CJ2M CPU Unit CJ2M-CPU3@

CJ2M-CPU1@

CJ2M

Problem Cause Solution

After the above message is displayed, a compiling
error will be displayed on the Compile T a b P age in the
Output Window.

An attempt was made to down­load a program containing
instructions supported only by
later unit versions or a CPU Unit
to a previous unit version.

Check the program or change to
a CPU Unit with a later unit ver­sion.

An attempt was to download a
PLC Setup containing settings
supported only by later unit ver­sions or a CPU Unit to a previous
unit version.

Check the settings in the PLC
Setup or change to a CPU Unit
with a later unit version.

“????” is displayed in a program transferred from the
PLC to the CX-Programmer.

An attempt was made to upload
a program containing instruc­tions supported only by higher
versions of CX-Programmer to a
lower
version.

New instructions cannot be
uploaded to lower versions of
CX-Programmer. Use a higher
version of CX-Programmer.

38

CJ2 CPU Unit Software User’s Manual

Related Manuals

Manuals related to a PLC built using a CJ-series CJ2 CPU Unit are listed in the following table. Use
these manuals for reference.

Manual Cat. No. Model Application Description

CJ-series CJ2 CPU
Unit Software User’s
Manual (this man­ual)

W473 CJ2H-CPU6@-EIP

CJ2H-CPU6@
CJ2M-CPU@@

Software specifications for
CJ2 CPU Units

Describes the following for CJ2 CPU Units:

• CPU Unit operation

• Internal memory

• Programming

• Settings

• Functions built into the CPU Unit
Also refer to the Hardware User’s Manual

(W472)

CJ-series CJ2 CPU
Unit Hardware
User’s Manual

W472 CJ2H-CPU6@-EIP

CJ2H-CPU6@
CJ2M-CPU@@

Hardware specifications for
CJ2 CPU Units

Describes the following for CJ2 CPU Units:

• Overview and features

• Basic system configuration

• Part nomenclature and functions

• Mounting and setting procedure

• Remedies for errors

• Also refer to the Software User’s Manual
(W473).

EtherNet/IP Units
Operation Manual

W465 CJ2H-CPU6@-EIP

CJ2M-CPU3@
CS1W-EIP21
CJ1W-EIP21

Using the built-in Ether­Net/IP port of the CJ2 CPU
Unit

Describes the built-in EtherNet/IP port and Eth­erNet/IP Units.

Describes basic settings, tag data links, FINS
communications, and other functions.

CS/CJ/NSJ-series
Instructions Refer­ence Manual

W474 CJ2H-CPU6@-EIP

CJ2H-CPU6@
CJ2M-CPU@@
CS1G/H-CPU@@H
CS1G/H-CPU@@-V1
CJ1G/H-CPU@@H
CJ1G-CPU@@
CJ1M-CPU@@
NSJ@-@@@@(B)-G5D
NSJ@-@@@@(B)-M3D

Information on instructions Describes each programming instruction in

detail.
Also refer to the Software User’ s Manual (W473)

when you do programming.

CS/CJ/CP/NSJ­series Communica­tions Command Ref­erence Manual

W342 CJ2H-CPU6@-EIP

CJ2H-CPU6@
CJ2M-CPU@@
CS1G/H-CPU@@H
CS1G/H-CPU@@-V1
CS1D-CPU@@H
CS1D-CPU@@S
CS1W-SCU@@-V1
CS1W-SCB@@-V1
CJ1H-CPU@@H-R
CJ1G/H-CPU@@H
CJ1G-CPU@@P
CJ1M-CPU@@
CJ1G-CPU@@
CJ1W-SCU@@-V1
CP1H-X@@@@-@
CP1H-XA@@@@-@
CP1H-Y@@@@-@
CP1L-M/L@@@-@
CP1E-E@@D@-@
CP1E-N@@D@-@
NSJ@-@@@@(B)-G5D
NSJ@-@@@@(B)-M3D

Information on communi­cations for CS/CJ/CP­series CPU Units and NSJ­series Controllers

Describes C-mode commands and FINS com­mands

Refer to this manual for a detailed description of
commands for communications with the CPU
Unit using C mode commands or FINS com­mands.

Note This manual describes the communica-

tions commands that are addressed to
CPU Units. The communications path that
is used is not relevant and can include any
of the following: serial ports on CPU Units,
communications ports on Serial Commu­nications Units/Boards, and Communica­tions Units. For communications
commands addressed to Special I/O Units
or CPU Bus Units, refer to the operation
manual for the related Unit.

CX-One Setup Man­ual

W463 CXONE-AL@@C-V@/

AL@@D-V@

Installing software from the
CX-One

Provides an overview of the CX-One FA Inte­grated Tool Package and describes the installa­tion procedure.

39

CJ2 CPU Unit Software User’s Manual

CX-Programmer
Operation Manual

W446 WS02-CX@@-V@ Support Software for Win-

dows computers

CX-Programmer operating
procedure

Describes operating procedures for the CX-Pro­grammer.

Also refer to the Software User’s Manual (W473)
and CS/CJ/NSJ-series Instructions Reference
Manual (W474) when you do programming.

CX-Programmer
Operation Manual
Functions
Blocks/Structured
Text

W447

CX-Programmer
Operation Manual
SFC Programming

W469

CS/CJ/CP/NSJ­series CX-Simulator
Operation Manual

W366 WS02-SIMC1-E Operating procedures for

CX-Simulator Simulation
Support Software for Win­dows computers

Using simulation in the CX­Programmer with CX-Pro­grammer version 6.1 or
higher

Describes the operating procedures for the CX­Simulator.

When you do simulation, also refer to the CX-

Programmer Operation Manual (W446), Soft­ware User’s Manual (W473), and CS/CJ/NSJ­series Instructions Reference Manual (W474).

CS/CJ/CP/NSJ­series CX-Integrator
Network Configura­tion Software Opera­tion Manual

W464 CXONE-AL@@C-V@/

CXONE-AL@@D-V@

Network setup and moni­toring

Describes the operating procedures for the CX­Integrator.

Manual Cat. No. Model Application Description

40

CJ2 CPU Unit Software User’s Manual

1-1

CJ2 CPU Unit Software User’s Manual

1

This section provides an overview of the CJ2 CPU Units.

1-1 Overview of CJ2 CPU Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1-1-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1-1-2 CJ2 CPU Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

1-2 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Overview

1 Overview

1-2

CJ2 CPU Unit Software User’s Manual

1-1 Overview of CJ2 CPU Units

The SYSMAC CJ2-series CPU Units are multi-functional CPU Units that provide the following features.

z Fast, with Large Memory Capacity

Basic performance is faster and memory capacity has been increased to provide ample capability
for machine control.

z Built-in EtherNet/IP Port (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)

The CJ2 CPU Units support the EtherNet/IP open network as a standard feature. Universal Ethernet
communications, such as data links between PLCs, message communications between PLCs, and
FTP transfers, are all possible from a peripheral device connection.

z General-purpose Networks for Support Software Interface

Support Software and devices can be easily connected using commercially available cable to gen­eral-purpose networks via USB and EtherNet/IP ports. (The EtherNet/IP port is provided only on the
CJ2H-CPU6@-EIP and CJ2M-CPU3@.)

z Tag Access (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)

CJ2 CPU Units have a tag name server to manage tag names and I/O addresses. This enables
access from external devices using tag names, without needing to know the I/O addresses.

z Synchronous Unit Operation (CJ2H CPU Units with Unit Version 1.1 or Later)

The timing of processing performed by CPU Bus Units an d Special I/O Units can be synchronized.
This minimizes fluctuations in timing from input and processing to outputs, making it easier to ensur e

application performance.

z Easier Programming

CJ2 CPU Units offer a highly readable programming environment, including features such as
addressing DM and EM Area bits, setting address offsets, and using array variables.

z Improved Debugging

Online editing and data tracing have been improved, greatly increasing the efficiency of debugging.

z Increased Pulse I/O Capacity (CJ2M CPU Unit with Unit Version 2.0 or Later)

With the CJ2M CPU Units, an optional Pulse I/O Block can be mounted to enable pulse I/O for up to
four axes.

z More Serial Communications Ports (CJ2M-CPU3@ Only)

With the standard CJ2M CPU Unit (CJ2M-CPU3@), you can add an RS-232C or RS-422A/485
Option Board to the standard-feature EtherNet/IP port to increase the number of serial communica­tions ports.

1-1-1 Overview

1-3

1 Overview

CJ2 CPU Unit Software User’s Manual

1-1 Overview of CJ2 CPU Units

1

1-1-1 Overview

CJ2H CPU Units

CJ2M CPU Units

Standard CPU Units (CJ2M-CPU3@) Simple CPU Units (CJ2M-CPU1@)

Tag access

Easier programming

General-purpose networks for
Support Software interface

Improved debugging

Faster, with
greater capacity

Synchronous unit operation

Built-in EtherNet/IP port
(CJ2H-CPU6@-EIP)

RS-232C RS-422A/485

More serial
communications
ports

General-purpose
networks for Support
Software interface

Built-in
EtherNet/IP port

Easier programming

Tag access

Easier programming

Improved
debugging

General-purpose
networks for Support
Software interface

1 Overview

1-4

CJ2 CPU Unit Software User’s Manual

z High-speed Processing

High-speed processing is possible for basic instructions (0.016 µs min. for CJ2H and 0.04 µs min.
for CJ2M), special instructions (0.05 µs min. for CJ2H and 0.06 µs min. for CJ2M), and immediate
refreshing (0.99 µs min. for CJ2H and 1.26 µs min. for CJ2M).

z Large Program Capacity

The CJ2 CPU Units provide a large program capacity of up to 400 Ksteps.

z Special Function Block Definition Area (CJ2M Only)

With a CJ2M CPU Unit, a special area called the FB Program Area is provided to store function
block definitions. (The FB Program Area holds 20K steps.) This allows you to us e fu nctio n blocks to
make program components and structures from previous programs while reducing the usage of the
User Program Area. And any function block definitions that would exceed the FB Program Area are
stored in the User Program Area.

z Large Data Memory Capacity

The CJ2 CPU Units provide a large EM Area capacity of up to 800 Kwords (25 banks).

z Up to 128 Cyclic Tasks

The user program can be divided into up to 128 tasks. Using smaller task programs makes it easier
to structure programs and contributes to shorter cycle times.

z Better Execution Performance for Interrupt Tasks (CJ2H CPU Unit with Unit

Version 1.1 or Later)

With CJ2H CPU Units with unit version 1.1, overhead time for interrupt tasks is approximately 20%
less than for unit version 1.0 even for normal usage. Also, by using High-speed interrupt function, it
is possible to improve execution performance as shown below with certain restrictions.

• Greatly reduce overhead time for interrupt tasks (interrupt task startup time + return time to cyclic
tasks).

Example: For I/O interrupt tasks, the time for normal operation is 37 µs but the time is 25 µs if

High-speed interrupt function is used.

• Minimum Interval Setting of 0.1 ms for Scheduled Interrupt Tasks
(For unit version 1.0, the minimum interval is 0.2 ms.)

1-1-2 CJ2 CPU Unit Features

Fast, with Large Memory Capacity

1-5

1 Overview

CJ2 CPU Unit Software User’s Manual

1-1 Overview of CJ2 CPU Units

1

1-1-2 CJ2 CPU Unit Features

The CJ2 CPU Units provide as standard equipment a built-in EtherNet/IP port that suppor ts the same
FINS Ethernet functions as an Ethernet Unit (including features such as a FTP server and time coordi­nation) as well as the EtherNet/IP open network.

z High-speed, High-capacity Data Links with User-set Refresh Cycles

The CJ2 CPU Units provide high-speed, high-capacity dat a links , a nd refre sh cycles can be se t indi­vidually for each data link area.

In addition, using the EtherNet/IP DataLink Tool makes it possible to set the data links usin g an inter­face similar to that of the Controller Link automatic data link setup.

z P eripheral USB and EtherNet/IP Ports

A commercially available USB cable can be used to connect to the PLC directly from a USB port on
a personal computer. In addition, with the CJ2H-CPU6@-EIP or CJ2M-CPU3@, a PLC on the Ether­Net/IP network can be accessed via USB.

z Prevent Connecting to the Wrong PLC by Using PLC Names from Support

Software

A user-set PLC name can be recorded in a CJ2 CPU Unit. When using Su pport Software to conn ect
online to a PLC, verification of the PLC name prevents incorrect connections from the Support Soft­ware.

Built-in EtherNet/IP Po rt (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)

General-purpose Networks for Support Software Interface

EtherNet/IP

High speed

The refresh cycle can be set individually for each area.

High capacity

CJ2 CPU Unit

CJ2 CPU Unit

1 Overview

1-6

CJ2 CPU Unit Software User’s Manual

z Network Symbols (Tags) for Flexible Support of Program Changes

The CJ2 CPU Units support network symbols (tags). They have an internal tag name server that
enables them to store tag names and a ddresses in advance in symbol tables in the CPU Units. Tags
enable the following features.

Data links can be set using tags.

With data links on an EtherNet/IP network, send and receive areas can be specified using symbols
rather than addresses. This enables flexible support for design changes by allowing the data link
areas set by tags to remain unchanged , while simply changing th e symbol tab les that cont ain the tag
names and addresses.

Access from host devices is enabled using tags.

Tags can be used for access from host devices, such as touch panel NS-series Programmable Ter­minals. This makes the creation of host screens and programs at devices such as PTs much more
convenient.

Automatic tag allocation makes it unnecessary to know the addresses.

Automatic allocation of tags in the high- capacity EM Area, using automati c address allocat ion in CX­Programmer symbol tables , enab les data link design an d access from host devices without having to
pay attention to addresses.

Tag Access (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only)

Data links enabled by names

EtherNet/IP

Examples:

Inputs from a to b
Inputs from c to d

CJ2 CPU Unit

CJ2 CPU Unit

EtherNet/IP

Touch Panel
NS-series PT

Examples:

Writing to a
Reading from b

Middleware
Supporting EtherNet/IP

CJ2 CPU Unit

CJ2 CPU Unit

Host application, such as SCADA

Access is possible using tags.

PERIPHER

A

L

ERR/ALM

RUN

INH

COM

M

BKU

P

PRPHL

CONTR

OLLER

CPU6

4-

EIP

CJ2H

SYSMAC

PROGRAM

MABLE

PORT

OPEN

BUSY

MCPWR

NS

M

S

COM

M

10M

100

M

Tags are allocated in
a high-capacity area.

Designing is performed
by using only tags,
with no need to pay
attention to addresses.

EtherNet/IP

Specified by tag a.

CJ2 CPU Unit

1-7

1 Overview

CJ2 CPU Unit Software User’s Manual

1-1 Overview of CJ2 CPU Units

1

z A CJ2 CPU Unit can synchronize the start of the processing performed by

CPU Bus Units and Special I/O Units to a specified cycle.

Synchronous data refreshing can be used between the CPU Unit and Synchronous Units,* and the
refreshed data can be used in operations in a synchronous interrupt task. This enables multiaxis
control with minimal fluctuations in the timing from inputs and processing to outputs. This provides
support for motion applications that require precise timing, such as electronic cam control.

* Synchronous Units are CPU Bus Units and Special I/O Units that support the synchronous unit operation func-

tion. Only the CJ1W-NC214, CJ1W-NC234, CJ1W-NC414, and CJ1W-NC434 Position Control Units support
synchronous unit operation as of December 2009.

z Address offsets can be specified.

When an address is specified for an instruction operand, an offset can be specified in brackets after
the address to offset it. For example, by setting a word address in brackets to specify the offset, the
address can be dynamically specified according to the contents of that word.

Example
W0.00[D0]: W0.00 is the starting address and the contents of D0 is the offset. If D0 is &3, then
W0.03 is specified.

z Symbols can be specified for array variable subscripts.

By specifying symbols for array variable subscripts, elements can be dynamically specified accord­ing to the values of the symbols.

Example
a[b]: The value of symbol b specifies the element for array variable a[ ].

Synchronous Unit Operation (CJ2H CPU Units with Unit Version 1.1
or Later)

Easier Programming

CJ2 CPU Units (with unit
version 1.1 or later)

Example:
Electronic cam control

Synchronous Units

Example:
Position Control Units

Example:
High-speed Counter Unit

Synchronous data
refreshing

Encoder

Motor drive
Servomotor

Several servomotors are controlled synchronously
based on the operation of the encoder.

1 Overview

1-8

CJ2 CPU Unit Software User’s Manual

z Create and Use Data Structures

With CX-Programmer version 9.0 or higher, data structures can be created and used. This enables
easily using I/O memory in the CPU Unit as a databas e or for library data .

z Bit addresses can be used in the DM Area and EM Area.

Previously the DM Area and the EM Area could be addressed only by words, and bit addresses
could not be specified. The work area for bits ca n no w be expanded by enabling bit addresses in the
DM and EM Areas.

For example, D10.00 specifies bit 00 of D10.

z The format for timer/counter PV refreshing can be selected individually for

each instruction.

Either BCD or binary can be selected individually for each instruction as the format for timer/counter
PV refreshing. For example, the TIM (BCD) and TIMX (binary) instructions can be used together.

z

The optimum languages can be combined for structured programming.

Ladder diagrams, ST, and SFC languages can be freely combined in the user program. Being able
to use the optimum languages for a particular process helps reduce the time involved in program­ming.

In addition, ladder diagrams and ST language can be freely used for function blocks (FBs) in ladder
diagrams and ST programs, and for transition and action programs in SFC. This feature makes it
possible to optimize structured programming.

User program

Task

Task

Task

Task

SFC
Step progression control

Ladder diagram
Control of equipment

and external devices

ST
Math processing

a := a + 1;

The programming language
suited to the process can be used.

Transition and action
programs in SFC

Ladder diagram

ST

FB_(A:=B,C=>D);

a := a + 1;

The programming
language suited to
the process can
be used.

FB in ladder diagram

FB in ST program

1-9

1 Overview

CJ2 CPU Unit Software User’s Manual

1-1 Overview of CJ2 CPU Units

1

1-1-2 CJ2 CPU Unit Features

z Reduced Effect on Cycle Time from Online Editing

The additional cycle time due to online editing has been reduced to approx. 1 ms, minimizing the
effects on equipment operation during debugging.

z Fast, High-capacity Data Tracing

Up to 32 Kwords of data can be traced (8 time more than previously), with ample trigger conditions,
and data can be traced continuously for long periods of time.

z Easy Setup Function for Data Tracing with CX-Programmer Version 9.0 or

Higher

With CX-Programmer version 9.0 or higher, data to be traced can be easily selected from lists.
When using the Pulse I/O Block with a CJ2M CPU Unit, the current pulse output frequency can be
calculated every 500 µs and the data can be traced.

z Force-set/Reset Bits in Specified EM Area Banks

With CX-Programmer version 8.3 or higher, a parameter can be set to enable force-setting/resetting
bits in specified EM Area banks. (This function is supported only by CJ2H CPU Units with unit ver­sion 1.2 or later and CJ2M CPU Units.)

Improved Debugging

1 Overview

1-10

CJ2 CPU Unit Software User’s Manual

With the CJ2M-CPU3@, one Ser ial Communications Option Board with one RS-232C por t o r one RS­422A/485 port can be added.

With the serial port, it is easy to connect to general components, such as barcode readers, and other
components such as PTs, other CJ/CP-series PLCs, and Inverters.

Add a Serial Option Board (CJ2M-CPU3@ Only)

COMM

RDA- RDB+ SDA- SDB+ FG

COMM

RDA- RDB+ SDA- SDB+ FG

COMM

RS-232C

CJ2M-CPU3@

CP1W-CIF01

RS-232C

CP1W-CIF12 CP1W-CIF11

Example: NS-series PT

Serial Option Boards

EtherNet/IP

RS-232C

Example: Serial PLC Links

CJ2M, CP1E, CP1L, or CJ1M

Or RS-422A/485

NT Link or
other protocol

Barcode reader or other
general-purpose component

RS-422A/485 port
(isolated, max. transmission
distance: 500 m)

RS-422A/485 port
(not isolated, max.
transmission distance: 50 m)

COMM

1-11

1 Overview

CJ2 CPU Unit Software User’s Manual

1-2 Basic Operating Procedure

1

1-1-2 CJ2 CPU Unit Features

1-2 Basic Operating Procedure

In general, use the following procedure.

Use Pulse I/O and Interrupt Inputs (CJ2M CPU Units Only)

1. Setting Devices and Hardware

2. Wiring

3. Connecting Online to the PLC

4. I/O Allocations

5. Software Setup

6. Creating the Program

8. Basic Program Operation

Wire the power supply, I/O, and communications. Refer to the following manuals.

Connect the personal computer online to the PLC.

Using the CX-Programmer, allocate I/O memory in the CPU Unit to the mounted Units.

Make the PLC software settings.

Create the program using the CX-Programmer.

7. Checking Operation

Set the operating mode to RUN mode to start operation.

Mount the Power Supply Unit, the CPU Unit, the other Units, and the End Covers. Set the DIP switch
and rotary switches as required.

Refer to Section 3 Nomenclature and Functions and Section 5 Installation in the CJ2 CPU Unit
Hardware User’s Manual (Cat. No. W472).

Refer to Section 5 Installation in the CJ2 CPU Unit Hardware User’s Manual (Cat. No. W472).
Refer to Section 11 Programming Devices and Communications in the CJ2 CPU Unit Software
User’s Manual (Cat. No. W473).

Refer to Section 4 Support Software in the CJ2 CPU Unit Hardware User’s Manual (Cat. No.
W472)

Refer to Section 8 I/O Allocations and Unit Settings in the CJ2 CPU Unit Software User’s
Manual (Cat. No. W473)

• CPU Unit initialization: Refer to Section 4 CPU Unit Initialization in the CJ2 CPU Unit
Software User’s Manual (Cat. No. W473).

• DM Area Settings for Special I/O Units and CPU Bus Units: Refer to Section 8 I/O Allocations
and Unit Settings in the CJ2 CPU Unit Software User’s Manual (Cat. No. W473).

• PLC Setup: Refer to Section 9 PLC Setup in the CJ2 CPU Unit Software User’s Manual (Cat.
No. W473).

Refer to Section 5 Understanding Programming in the CJ2 CPU Unit Software User’s Manual
(Cat. No. W473).

Refer to 10-7 Debugging in the CJ2 CPU Unit Software User’s Manual (Cat. No. W473).

Check the I/O wiring and the AR Area settings, and perform trial operation. The CX-Programmer can
be used for monitoring and debugging.

1 Overview

1-12

CJ2 CPU Unit Software User’s Manual

2-1

CJ2 CPU Unit Software User’s Manual

2

This section describes the memory areas contained in the CPU Unit.

2-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2-1-1 Memory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2-1-2 Memory Areas and Stored Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-1-3 Transferring Data from a Programming Device to the CPU Unit . . . . . . . . . . . 2-4

Internal Memory in the CPU Unit

2 Internal Memory in the CPU Unit

2-2

CJ2 CPU Unit Software User’s Manual

2-1 Overview

As shown in the following diagram, the internal memory in the CPU Unit consists of built-in flash mem­ory and built-in RAM. The built-in RAM is used as execution memory and the built-in flash memory is
used as backup memory.

The built-in flash memory backs up the user program and parameters, and stores the program source,
comment, and network symbols. Data is held in this area even without depending on a battery. I/O
memory is not backed up.

The built-in RAM is the execution memory for the CPU Unit. The user program, parameters, and I/O
memory are stored in the built-in RAM, and the built-in RAM is backed up by battery.
If the battery does not work (e.g., if the battery voltage is low or no battery is installed), the I/O memory
data is lost. The user program and parameters are backed up to the built-in flash memory, so they are
not lost.

2-1-1 Memory Configuration

Built-in Flash Memory

Built-in RAM

Built-in Flash Memory

Built-in RAM

CPU Unit

User Program Area

(Backup)

Parameter Area

(Backup)

Source and

Comment Areas

Network Symbols (Tags)

Data is held in these areas
without depending on a
backup battery.

Data is backed up in these
areas by a battery.

Backup

Battery
(CJ1W-BAT01)

User Program Area

Parameter Area

I/O Memory Areas

Execution Memory

Backup Memory

Tag Memory

Automatic backup

Read at startup

Automatic backup

Read at startup

Automatic backup

Read at startup

FB Program Area

(Backup)

FB Program Area

Parameter Area

2-3

2 Internal Memory in the CPU Unit

CJ2 CPU Unit Software User’s Manual

2-1 Overview

2

2-1-2 Memory Areas and Stored Data

Precautions for Correct UsePrecautions for Correct Use

The following will occur if the battery is low or when no battery is installed.

• Data in the I/O memory areas will be lost or values will become unstable, including values in
the DM, EM, and HR Areas, which are retained by t he battery when power is OFF.

• The clock will stop, and all clock-related data will become unstable.

• Error logs will not be retained.

• The Output OFF Bit will become unstable.

The following table lists the CPU Unit memory areas and the data stored in each area.

*1 Supported only by the CJ2M CPU Units. With CJ2H CP U Units, function block definitions are stored in the User Program

Area instead of the FB Program Area.

*2 Supported only by the CJ2H-CPU6@-EIP and CJ2M-CPU3@.

2-1-2 Memory Areas and Stored Data

Memory area and stored

data

Details

Built-in

flash

memory

Built-in

RAM

User Program Area The User Program Area stores the object code for executing the user program that

was created using the CX-Programmer.

Stored. Stored.

FB Program Area

*1

The FB Program Area stores the function block definitions created using the CX­Programmer.

Stored. Stored.

Parameter Area The Parameter Area stores the initial settings for the PLC. Stored. Stored.

PLC Name The name of the CPU Unit is stored and can be read and verified by the CX-Pro-

grammer to prevent the CX-Programmer from connecting to the wrong PLC.

PLC Setup Various initial settings are made in the PLC Setup using software switches. Refer to

Section 9 PLC Setup.

I/O Tables I/O tables provide information on the mounting status of Units specified by the user.

Refer to Section 8 I/O Allocations and Unit Settings.

Routing Tables Routing tables are network parameters for FINS communications. They are speci-

fied using the CX-Integrator. Refer to the CX-Integrator Operation Manual (Cat. No.
W464).

CPU Bus Unit Setup The CPU Bus Unit Setup stores the initial settings for specific CPU Bus Units. It

includes settings such as Ethernet settings for Ethernet Units and data link parame­ters for Controller Link Units.

I/O Memory Areas The I/O Memory Areas are used for reading and writing from the user program. It is

partitioned into the following regions according to purpose.
A region where data is cleared when power to the CPU Unit is reset, and a region

where data is retained.
A region where data is exchanged with other Units, and a region that is used inter-

nally.

--- Stored

Source and Comment
Areas

The Source and Comment Areas are used for storing the program source code and
comments created using the CX-Programmer.

Stored ---

Source Code The source code for programs (in tasks and function blocks, using ladder, ST, and

SFC languages).

Symbol Table The symbol table contains symbols created using the CX-Programmer (symbol

names, addresses, and I/O comments).

Comments Comments are created using the CX-Programmer and include annotations and row

comments.

Program Index The program index provides information on program sections created using the CX-

Programmer, as well as program comments.

Network Symbols (Tags)

*2

Data for network symbols in the global symbol table. Stored ---

2 Internal Memory in the CPU Unit

2-4

CJ2 CPU Unit Software User’s Manual

Data that has been created using the CX-Programmer or the CX-Integrator is transferred to the internal
memory in the CPU Unit as shown in the following diagram.

2-1-3 Transferring Data from a Programming Device to the CPU Unit

User-created programs

User program

Network symbols

*2

Symbol table

Comments and

program index

Parameters

Routing tables

User Program Area

User program

Tag Memory Area

*3

Source and Comment Areas

Parameter Area

I/O Memory Areas

Network symbols

Program

source

Symbol table

Parameters

Routing tables

CPU Bus Unit System

Setup Area

Comments and

program index

The CX-Programmer is used
to set specific I/O memory
status, and writing to the I/O
Memory Area is enabled.

(PLC memory, PLC Setup,
I/O tables)

CPU Unit

CX-Programmer

CX-Integrator

CPU Bus Unit System Setup

*2

*1: Supported only by the CJ2M CPU Units.

With CJ2H CPU Units, function block
definitions are stored in the User Program
Area instead of the FB Program Area.

*2: Ethernet settings are made and trans-

ferred from the CX-Programmer. Data link
tables are made and transferred from the
CX-Integrator.

*3: Supported only by the CJ2H-CPU6@-EIP

and CJ2M-CPU3@.

*1

Function block

definitions

FB Program Area

*1

Function block
definitions

3-1

CJ2 CPU Unit Software User’s Manual

3

This section describes the internal operation of the CPU Unit and the operating modes
that can be set for the CPU Unit.

3-1 CPU Unit Internal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3-1-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3-1-2 Cycle Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

3-1-3 Processing at Power Interruptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

3-2 CPU Unit Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

3-2-1 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

3-2-2 Checking the Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

3-2-3 Changing the Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

3-2-4 Operating Mode Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

CPU Unit Operation

3 CPU Unit Operation

3-2

CJ2 CPU Unit Software User’s Manual

3-1 CPU Unit Internal Operation

The CPU Unit writes data to the internal I/O memor y areas while it cyclically executes user programs.
Data is exchanged externally when I/O is refreshed and peripherals are serviced. The following figure
shows the internal operation of the CPU Unit.

The following processes will be performed once each time the power is turned ON to the PLC.

• Detecting connected Units (I/O allocation)

• Comparing the registered I/O tables and the connected Units

• Clearing the non-holding areas in I/O memory according to the status of the IOM Hold Bit

• Clearing forced status according to the status of the Forced Status Hold Bit

• Autobooting using the autotransfer files in the Memory Card if one is inserted

• Performing self-diagnosis (user memory check)

• Restoring the user program

• Updating the PLC Setup

3-1-1 Overview

Startup Initialization

Startup initialization

(1) Overseeing processing

(2) Program execution

(4) I/O refreshing

(3) Peripheral servicing

Cycle
time

Pro-

cessing

cycle

Configuration
Units

3-3

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-1 CPU Unit Internal Operation

3

3-1-1 Overview

The CPU Unit will repeatedly perform four processes (overseeing, program execution, I/O refreshing,
and peripheral servicing) after startup initialization. The time it takes to complete one cycle is called the
cycle time.

•Overseeing
This process prepares to execute the user program. It chec ks the har dware and software required for
processing. The time required for overseeing is called the o verhead time.

• Program Execution
This process executes the instructions in the user program. The instructions in the user program are
executed when the operating mode is set to RUN or MONITOR mode. I/O processing for the instruc­tions is performed on bits and words in the I/O memory areas in the CPU Unit.

• Peripheral Servicing
This process occurs when messages are required from Programming Devices or Units. Data is writ­ten from the CX-Programmer or performed for instructions for Network Communications Units.

• I/O Refreshing
This process exchanges data with the Units by using the I/O memor y areas. This pr ocess is always
performed after program execution. I/O refreshing is performed within the current cycle without inter­ruption (i.e., without time slicing).

Processing Cycle

3 CPU Unit Operation

3-4

CJ2 CPU Unit Software User’s Manual

The cycle time is the total time for overseeing, program execution, peripheral servicing, and I/O refresh­ing. The cycle time normally fluctuates each cycle depending on the pr ocessing that is p erf o rmed. Each
of these processes is performed within the cycle time. Refer to Section 12 CPU Unit Cycle Time for
information on how to calculate the cycle time.

Additional Information

A constant cycle time can be created by setting a minimum cycle time in the PLC Setup. The
minimum cycle time must be longer than any normal cycle time. For information on how to set a
minimum cycle time, refer to 10-2-1 Minimum Cycle Time.

The overhead time occurs for overseeing each cycle. Th e following items are checked.

• Battery error

•Memory Card

• DIP switch

• I/O bus

• User program memory

This is the processing time for instructions in the user program.

• The processing time includes instr uctio n s in cy clic tasks that are in READY status and instructions in
interrupt tasks for which the interrupt conditions are met. It does not include instr uctions that are
jumped in the programs.

• The processing time depends on the number of instructions and the specific instructions that are
used. It also depends on the operands that are specified (e.g., on the amount of data to be pro­cessed).

• In RUN or MONITOR mode, internal processing time is required for instructio ns with OFF execution
conditions. In the following cases, internal processing is not performed and processing time is not
required.

• A cyclic task in WAIT status

• Instructions that are jumped for a JMP(004), CJP(510), or CJPN(511) instruction.

Additional Information

Consider the following programming if it is necessary to shorten the cycle time.

• Divide programs into cyclic tasks and place tasks into WAIT status when they do not need to
be executed.

• Use the JMP(004), CJP(510), and CJPN(511) instructions to jump instructions when they do
not need to be executed.

3-1-2 Cycle Time

Overseeing

Program Execution

3-5

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-1 CPU Unit Internal Operation

3

3-1-2 Cycle Time

Peripheral servicing involves servicing non-scheduled events for external devices. This includes both
events from external devices and service requests to external devices.

Most peripheral servicing for CJ-series PLCs involves FINS commands. The amount of time specified
in the system is allocated to ea ch type of se r v icing and executed every cycle. If all servicing cannot be
completed within the allocated time, the remaining servicing is performed the next cycle. If peripheral
servicing is delayed too much, increase the fixed servicing time in the PLC Setup to a value larger than
10% using the CX-Programmer.

z P eripheral Servicing Time

With the default peripheral servicing time setting, 10% of the preceding cycle time is assigned to the
total peripheral service. Therefore, the peripheral servicing time depends on the preceding cycle
time.

Set a time longer than 10% of the cycle time using Fixed Servicing Time in the PLC Setup from the
CX-Programmer when peripheral servicing is delayed because too many cycles is required to com­plete it. Keep in mind that increasing the servicing time will also increase the cycle time.

z Types of Peripheral Servicing

Additional Information

Servicing time is allocated to Special I/O Units, CPU Bus Units, the peripheral USB port, ser ial
ports, file access, and communications ports.
If servicing is separated over many cycles, delaying completion of the servicing, set the same
allocated time (same time for all services) rather than a percentage under execute time settings
in the PLC Setup.

Peripheral Servicing

Units Servicing

Event servicing for Special I/O Units • Non-scheduled servicing for FINS commands from Special I/O Units

and CPU Bus Units (e.g., requests to start external interrupt tasks)

• Non-scheduled servicing for FINS commands from the CPU Unit to the
above Units.

Event servicing for CPU Bus Units

Peripheral USB port service • Non-scheduled servicing for FINS or Host Link commands received via

the peripheral USB or serial ports from Programming Devices, PTs, or
host computers (e.g., requests to transfer programming, monitoring,
forced-set/reset operations, or online editing)

• Non-scheduled servicing from the CPU Unit transmitted from the periph­eral USB or serial port (non-solicited communications)

Serial port service

Communications port servicing • Servicing to execute network communications, serial communications,

or file memory access for the SEND(090)/SEND2(491),
RECV(098)/RECV2(492), CMND(490)/CMND2(493), or
PMCR(260)/PMCR2(264) instructions using communications por ts
(internal logic ports).

• Servicing to execute background e xecution using communications ports.

File access servicing File read/write operations for Memory Cards or EM file memory.
Online editing servicing Servicing to backup contents edited with online editing in the built-in flash

memory when online editing is being processed.

Backup servicing Servicing to backup changed contents in the built-in flash memory when

there is a change in programming or parameters.

3 CPU Unit Operation

3-6

CJ2 CPU Unit Software User’s Manual

The I/O Unit processing time depends on the type and number of Configuration Units that are used in
the PLC. The processing time for each Unit is constant.

It is possible to shorten the processing time by stopping cyclic I/O refreshing for Special I/O Units. To
stop I/O refreshing for Special I/O Units, set the parameter on the SIOU Refresh Tab Page in the CX­Programmer. The following table lists th e refresh processing for the PLC Units.

* Supported only by the CJ2H-CPU6@-EIP and CJ2M-CPU3@. The EtherNet/IP port built into the CJ2H-CPU6@-

EIP provides the same performance and functions as a CJ1W-EIP21 EtherNet/IP Unit. The EtherNet/IP port built
into the CJ2M-CPU3@ provides very different performance. Refer to the EtherNet/IP Unit Operation Manual (Cat.
No. W465) for details.

Additional Information

It is possible to exchange data with the Units when instructions are executed rather than during
the normal I/O refresh period. This is called immediate refreshing. Immediate refreshing is possi­ble by attaching an exclamation mark (!) to some instructions, or by using the IORF(097),
FIORF(225), and DLNK(226) instructions.

The following instructions can be used to increase the speed of data exchange with certain Spe­cial I/O Units or CPU Bus Units by using direct processing. Refer to the Instructions Reference
Manual (Cat. No. W474) for details.

• ANALOG INPUT DIRECT CONVERSION (AIDC(216)) (for CJ1W-AD042 High-speed Analog
Input Unit)

*1

• ANALOG OUTPUT DIRECT CONVERSION (AODC(217)) (for CJ1W-DA042V High-speed
Analog Output Unit)

*1

• DIRECT TRANSMIT VIA SERIAL COMMUNICATIONS UNIT/SERIAL PORT (DTXDU(262))
(CJ1W-SCU@2 only)

*1

• DIRECT RECEIVE VIA SERIAL COMMUNICATIONS UNIT/SERIAL PORT (DRXDU(261))
(CJ1W-SCU@2 only)

*1

• PCU HIGH-SPEED POSITIONING (NCDMV(218)) (CJ1W-NC@@4 and CJ1W-NC@ only)

*2

• PCU POSITIONING TRIGGER (NCDTR(219)) (CJ1W-NC@81 only)

*2

*1 These instructions are supported only by the CJ2H-CPU6@(-EIP) (unit version 1.1 or later) and CJ2M

CPU Units.

*2 Supported only by the CJ2H-CPU6@(-EIP) with unit version 1.3 or later and CJ2M CPU Units.

I/O Refreshing

Units Maximum data exchange Data exchange area

Basic I/O Units Depends on the Unit. I/O Bit Area
Spe-

cial I/O
Units

Words allocated in CIO Area 10 words/Unit (Depends on the

Unit.)

Special I/O Unit Area

Unit-spe­cific data

CompoBus/S Master Unit Depends on the Unit. Words set for remote I/O communications

CPU
Bus
Units

Words allocated in CIO Area 25 words/Unit CPU Bus Unit Area
Words allocated in DM Area 100 words/Unit CPU Bus Unit words
Unit-spe-

cific data
(Refer to
the right.)

Built-in EtherNet/IP port

*

EtherNet/IP Unit

Depends on the EtherNet/IP
functions that are used.

Tag Data Link Area

Controller Link Unit and
SYSMAC LINK Unit

Depends on the Unit. Words set for data links (for either fixed or

user-set allocations)

DeviceNet Unit Depends on the Unit. Words set for remote I/O communications

(for either fixed or user-set allocations)

Serial Communications
Unit

Depends on the protocol mac­ros.

Communications data set for protocol
macros

Ethernet Unit Depends on the Unit. Communications data for socket services

initiated by specific control bit operations.

3-7

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-1 CPU Unit Internal Operation

3

3-1-3 Processing at Power Interruptions

If power is interrupted and the interruption is confirmed while the CPU Unit is operating, the instruction
currently being executed will be completed and the following power interruption processing will be per­formed.

Processing at power interruption will be performed according to the settings for power OFF interruption
tasks.

*1

• If the power OFF interrupt task has been enabled, the task will be executed and then the CPU Unit
will be reset immediately.

• If the power OFF interrupt task has not been enabled, the CPU Unit will be reset

*2

immediately.

*1 The power OFF interrupt task is executed immediately before the CPU Unit is reset due to power interruption.
*2 It is possible to perform power interruption processing after a specified range of instructions is executed when

the power is interrupted during operation.

Operation will always continue for momentary power failures of less than 10 ms for an AC pow er supply
and less than 2 ms for a DC power supply. It is possible to lengthen the time from which a power inter­ruption is detected until it is confirmed as a power interruption when the power supply conditions are
poor.

For information on processing at power interruption, refer to A-5 Operation for Power Interruptions.

3-1-3 Processing at Power Interruptions

3 CPU Unit Operation

3-8

CJ2 CPU Unit Software User’s Manual

3-2 CPU Unit Operating Modes

The operating mode can be set to control the oper ating conditions of the CPU Unit and control whether
settings can be made in the CPU Unit. There are three operating modes.

z RUN mode:

RUN mode is used for actual operation of the system and provides the fastest operation.
The programs are executed.
Bits cannot be force-set/reset, values in I/O memory cannot be changed, and online editing is not
possible.

z MONITOR mode:

MONITOR mode is for trial operation and adjustment.
The programs are executed.
Bits can be force-set/reset, values in I/O memory can be changed, and online editing is possible.

z PROGRAM mode:

PROGRAM mode is for transferring programs and the PLC Setup and creating the I/O tables.
The programs are not executed.

Change the operating mode by using the CX-Programmer connected to the CPU Unit.

3-2-1 Operating Modes

3-9

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-2 CPU Unit Operating Modes

3

3-2-2 Checking the Operating Mode

The RUN indicator on the f ront of the CPU Unit indicates the operating mode as described below.

You can check the operating mode in the project tree or status bar of the CX-Programmer.

z Project Tree

z Status Bar

Additional Information

An external RUN output can be achieved by using the CJ1W-PA205R Power Supply. The RUN
output (contact output) on the CJ1W-PA205R will tur n ON in RUN or MONITOR mode unless
there is a fatal error.

3-2-2 Checking the Operating Mode

Front-panel Indicator on the CPU Unit

Operating mode RUN indicator on CPU Unit Remarks

PROGRAM mode OFF --­RUN or MONITOR mode Lit green Use the CX-Programmer to see if the mode is RUN or

MONITOR mode.

CX-Programmer

Offline Online

The CPU Unit’s operating
mode is displayed.

The operating mode is displayed here.

The average cycle time will be displayed if
the CPU Unit is in RUN or MONITOR mode.

3 CPU Unit Operation

3-10

CJ2 CPU Unit Software User’s Manual

The operating mode can be changed from the CX-Programmer.

z Changing the Startup Mode

The default operating mode when the CPU Unit is turned ON is RUN mode. To change the startup
mode to PROGRAM or MONIT OR mode , set the desir ed mode in Startup Setting in PLC Setup from
the CX-Programmer.

z Changing the Operating Mode after Startup

Use one of the following procedures.

• Select PROGRAM, MONITOR, or RUN from the Operating Mode Menu.

• Right-click the PLC in the project tree, and then select PROGRAM, MONITOR, or RUN from the
Operating Mode Menu.

3-2-3 Changing the Operating Mode

Changing the Operating Mode

3-11

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-2 CPU Unit Operating Modes

3

3-2-3 Changing the Operating Mode

Some parts of I/O memor y, such as the CIO Area and Work area, will be cleared when the operating
mode is changed between R UN or MONI TOR mode and PROGRAM mode. These are called non-ho ld­ing areas. To hold the contents of these areas when the operating mode is changed, turn ON the IOM
Hold Bit (A500.12) in the Auxiliary Area

*1 Memory is cleared on if the IOM Hold Bit is OFF. If it is ON, data will be held as follows:

*2 The IOM Hold Bit (A500.12) will be turned OFF when a p ower interruption is reset. To retain the status, select

the IOM Hold Bit Check Box in the Startup Hold Settings Tab Page of the PLC Setup using the CX-Program­mer, and then transfer the PLC Setup.

*3 The Task Flags will be cleared regardless of the status of IOM Hold Bit (A500.12).

Memory Status after Mode Changes and Power Interruptions

Mode change Non-holding areas Holding Areas

• I/O Area

• Data Link Area

• CPU Bus Unit Area

• Special I/O Unit Area

• Work Area

• Timer PV and Completion Flags

• Index Registers

• Data Registers

• Task Flags
(Auxiliary Area bits/words are held or not
held depending on the address.)

• HR Area

•DM Area

•EM Area

• Counter PV and Completion Flags
(Auxiliary Area bits/words are held or not
held depending on the address.)

RUN or MONITOR to
PROGRAM

Cleared

*1

Held

PROGRAM to RUN
or MONITOR

RUN to MONITOR or
MONITOR to RUN

Held Held

Power interruption
reset

*2

Cleared

*3

Held

I/O Memory

Hold Bit sta-

tus (A500.12)

I/O Memory Output bits allocated to Output Units

Mode

changed

between

PROGRAM

and

RUN/MONI-

TOR

Fatal error Mode

changed

between

PROGRAM

and

RUN/MONI-

TOR

Fatal error

Fatal error
other than

FALS

FALS

executed

Fatal error
other than

FALS

FALS

executed

OFF Cleared Cleared Held OFF OFF OFF

ON

Held Held Held Held OFF:

Values in the I/O memory in
the CPU Unit will be held when
a fatal error occurs, but the
outputs from Basic Output
Units will turn OFF.

3 CPU Unit Operation

3-12

CJ2 CPU Unit Software User’s Manual

When the operating mode is changed between RUN or MONITOR mode and PROGRAM mode with
the default settings, the outputs from Basic Output Units will be refreshed according to the I/O memory
status that exists when the mode is changed.

The output status for Basic Output Units will be as follows depending on whether IOM Hold Bit
(A500.12) is ON or OFF.

• If A500.12 is OFF, the output bits will be cleared when the mode is changed to PROGRAM mode,
and so the outputs from the Basic Output Units will turn OFF.

• If A500.12 is ON, the status of the output bits is held when th e mode is changed to PR OG RAM mode ,
and so the status of the outputs from the Basic Output Units will also be held.

Precautions for Correct UsePrecautions for Correct Use

Precautions for setting the IOM Hold Bit (A500.12) to ON
When the mode is changed from RUN or MONITOR mode to PROGRAM mode, the I/O memory

status of the outputs will not be cleared (i.e., turned OFF), and the status before changing to
PROGRAM mode will be held. Therefore, when changing the mode again from PROGRAM
mode to RUN or MONITOR mode, the I/O memory values before changing to PROGRAM mode
will be output.

If operation stops due to a fatal error (including execution of an FALS(007) instruction), however,
all outputs from the Basic Output Units will turn OFF even if the I/O memory status in the CPU
Unit is held.

Output Status from Basic Output Units after Mode Change

3-13

3 CPU Unit Operation

CJ2 CPU Unit Software User’s Manual

3-2 CPU Unit Operating Modes

3

3-2-3 Changing the Operating Mode

Outputs from Basic Output Units will be refreshed with the I/O memory output bit status even in PRO­GRAM mode. Therefore, the status will be output from the Basic Output Units when the output bits in
I/O memory are changed using the CX-Programmer or other Support Software.

To be sure that the outputs from the Basic Output Units remain OFF, turn ON the Output OFF Bit
(A500.15). (See note.) The INH indicator on the front of the CPU Unit will be lit when all outputs are
OFF (i.e., when the Output OFF Bit is ON).

Note The status of the Output OFF Bit (A500.15) is held when the operating mode is changed and the power is

turned OFF and ON, i.e., the outputs will remain OFF.

Output Status from Basic Output Units in PROGRAM Mode

! WARNING

The CPU Unit refreshes I/O even when the program is stopped (i.e., even in PROGRAM mode). Con­firm safety thoroughly in advance before changing the status of any part of memory allocated to Basic
I/O Units, Special I/O Units, or CPU Bus Units. Any changes to the data allocated to any Unit may
result in unexpected operation of the loads connected to the Unit. Any of the following operation may
result in changes to memory status.

• Transferring I/O memory data to the CPU Unit from a Programming Device

• Changing present values in memory from a Programming Device

• Force-setting/-resetting bits from a Programming Device

• Transferring I/O memory files from a Memory Card or EM file memory to the CPU Unit

• Transferring I/O memory from a host computer or from another PLC on a network

3 CPU Unit Operation

3-14

CJ2 CPU Unit Software User’s Manual

The following table shows the status during each operating mode.

*1 When the Output OFF Bit (A500.15) is ON, the outputs from the Basic Output Units will turn OFF regardless of

the operating mode and I/O memory statu s. The outputs will remain OFF even if the power supply is turned
ON.

*2 Th e outputs from Output Units will be refreshed if memor y status is changed using Suppor t Software or PT,

even in PROGRAM mode.

3-2-4 Operating Mode Details

Operating mode PROGRAM MONITOR RUN

Purpose Stopping operation and

transferring programs

Testing operation and
making adjustments

Main operation

Program status Stopped Executed Executed
RUN indicator OFF ON ON
Operation

using CX-Pro­grammer

Creating I/O
tables

Possible Not possib le

Transferring
PLC Setup

Downloading
programs

Checking pro­grams

Online editing Possible Not possible
Checking wir-

ing by force­setting/reset­ting bits

Changing I/O
memory PVs

Changing
timer/counter
PVs and SVs

Uploading pro­grams

Possible

Monitoring I/O
memory

Monitoring pro-

grams
I/O refreshing Executed
Cyclic tasks Stopped Tasks set to start when operation starts an d tasks

that are started with a TASK ON instruction are

executed. Other tasks are stopped.
Interrupt tasks Stopped Executed when interrupt conditions are satisfied.
Outputs from

Basic Output
Units allocated

output bits

*1

IOM Hold Bit
OFF

OFF immediately after
changing to PRO-

GRAM mode.

*2

Depends on the pro-

gram

Depends on the pro­gram

IOM Hold Bit ONStatus held after chang-

ing to PROGRAM
mode.

*2

4-1

CJ2 CPU Unit Software User’s Manual

4

This section describes the initialization processing that is performed for the CPU Unit a t
startup.

4-1 Overview of CPU Unit Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-1-1 CPU Unit Initial Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-2 PLC Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4-3 Creating I/O Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

4-3-1 I/O Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

4-3-2 Automatic Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4-3-3 Manual Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4-4 Setting Routing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

4-4-1 Routing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

4-4-2 Cases in Which Routing Tables Are Required . . . . . . . . . . . . . . . . . . . . . . . . 4-13

4-4-3 Setting and Transferring Routing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

4-5 Setting Allocated DM Area Wor ds for Specia l I/O Units

and CPU Bus Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4-5-1 Setting Allocated DM Area Words for Special I/O Units and CPU Bus Units 4-15

4-5-2 Setting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4-6 CPU Bus Unit Setup Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

4-6-1 CPU Bus Unit Setup Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

4-6-2 Setting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

CPU Unit Initialization

4 CPU Unit Initialization

4-2

CJ2 CPU Unit Software User’s Manual

4-1 Overview of CPU Unit Initialization

Both hardware settings with the DIP switch and rotary switches on the front of the CPU Unit and soft­ware settings to set parameters with the CX-Programmer or other software must be made to make the
initial settings required for the CPU Unit.

z DIP Switch

Set the DIP switch according to the application.

z Rotary Switches

A unit number and node address are allocated to the built-in EtherNet/IP port on the CJ2H-CPU6@-EIP
and CJ2M-CPU3@ in the same way as for a CPU Bus Unit. Words are allocated to the built-in Ether­Net/IP port in the CPU Bus Unit Areas in the CIO Area and DM Area according to the unit number set­ting.

For details on hardware settings, refer to 3-1 CPU Units in the CJ2 CPU Unit Hardware User’s Manual
(Cat. No. W472).

4-1-1 CPU Unit Initial Settings

Hardware Settings

Location Purpose Setting method

DIP switch on fro nt of
CPU Unit

Main purposes:

• Program write protection: Turn ON pin 1.

• Automatic transfer at startu p: Turn ON pin 2.

• Toolbus connection with RS-232C: Turn ON pin 5.

• User-defined pin: Turn ON pin 6.

• Simple backup: Turn ON pin 7.

Make the settings with
the power supply OFF,
and then turn the
power supply ON.

4-3

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-1 Overview of CPU Unit Initialization

4

4-1-1 CPU Unit Initial Settings

The following table gives the software setting applications and setting methods for applicable Units.

*1 The following are classified as FINS Network Communications Units.

• Network Communications Unit Classified as CPU Bus Unit:
Controller Link Units, SYSMAC LINK Units, Ethernet Units, DeviceNet Units, and FL-net Units

• Using the CJ2H-CPU6@-EIP or CJ2M-CPU3@ built-in EtherNet/IP port for FINS network communications

• Using a serial gateway with a Serial Communications Unit and using routing tables.
Routing tables are not applicable to Network Communications Units for Special I/O Units (e.g., CompoNet Master

Units).

*2 The initial settings given above for the Special I/O Units or CPU Bus Units are stored in the CPU Unit. Data and programs

stored in the Special I/O Units and CPU Bus Units are created separately using Support Software specific to the Unit and
then transferred to the Special I/O Units and CPU Bus Units through the CPU Unit.

Software Settings

Units Settings Application Setting method

File created with

Programming

Device

Backup

destination

CPU Unit Param-

eter
area

PLC name Preventing incorrect

connection to CPU
Units

CX-Programmer CX-Programmer

project file (.CXP)

Built-in flash
memory

PLC Setup Using non-default

specifications

Registered I/O
tables

Checking for incorrect
connection and auto­matic allocation are
required or reserving
words for future alloca­tion and other applica­tion-specific settings

Routing tables Required when con-

necting more than one
FINS Network Com­munications Unit (*1)

CX-Integrator Routing table file

(.RTG)

Ethernet Units CPU Bus Unit

Setup Area
(CPU Bus Unit
Setups)(*2)

Using Ethernet Units CX-Programmer CX-Programmer

project file (.CXP)

Built-in flash
memory

Controller Link
Units (data link
tables)

Using user-set data
links for Controller
Links

CX-Integrator Data link tables

(.CL2)

FL-net Units Using FL-net Units CX-FLnet

(FL-net Support
Software)

FL-net Support
Software setting file
(.CSV)

Special I/O Units
and CPU Bus Units

I/O
memory

DM Area word
allocations (*2)
to Special I/O
Units or CPU
Bus Units

Using Special I/O
Units or CPU Bus
Units

• CX-Programmer

• User program

CX-Programmer
project file (.CXP)

Built-in RAM (bat­tery backup)

4 CPU Unit Initialization

4-4

CJ2 CPU Unit Software User’s Manual

Additional Information

Setting Program Tasks
The initial settings for assigning programs to tasks is set with the following program properties
using the CX-Programmer.

z PLC Name

This is a name that the user sets for the CPU Unit. Make the setting by selecting PLC Info − PLC
Info from the PLC Menu of the CX-Programmer.

The system will check if the name registered in the PLC matches the PLC name in the project when
the CX-Programmer is online.

z PLC Setup

The PLC Setup is used to make change s for using the CPU Unit with non-default specifica tions . T he
following setting s are examples of the defaults for the CPU Unit.

Startup mode: RUN mode
RS-232C port: Host link
Fixed servicing time: 10% of cycle time

To use specifications other than these defaults, change the PLC Setup using the CX-Programmer,
and transfer the PLC Setup to the CPU Unit.

⇒ Transferring PLC Setup from the CX-Programmer

PERIFHERAL

ERR/ALM

RU

N

IN

H

C

O
MM

BKUP

PRPH

L
C
ON

TROLLER

CPU

64-

EIP

CJ2H

SYSMAC

PROG

RAM

MABLE

PORT

O
P

EN

BUSY

MCPWR

N

S

MS

C

O

M
M

10M

100M

Transferring from the CX-Programmer

CPU Unit

PLC Setup

PLC Setup

4-5

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-1 Overview of CPU Unit Initialization

4

4-1-1 CPU Unit Initial Settings

z I/O Tables

Create I/O tables to detect incorrect Unit connections when manually setting Unit slots or to manu­ally allocate I/O in the CPU Unit. By default, CPU Unit I/O is automatically allocated in the order that
the Units are connected each time the powe r supply is turned ON.

Create the I/O tables by using one of the following operations from the CX-Programmer.

• Online: Perform the procedure for creating the I/O tables with connected Units.

• Offline: Edit the I/O tables (with or without the Units mounted), and then transfer the tables to the
CPU Unit.

z Routing Tables

Routing tables must be created with the CX-Integrator if more than one FINS Network Communica­tions Unit (CPU Bus Unit) is mounted to the CPU Unit. In the local network table, a network address
is assigned to each FINS Network Communications Unit.

Set the local network table with the CX-Integrator and transfer it to the CPU Unit.

PERIPHERAL

ERR

/

A

LM

RUN

INH

COM

M

PRPH

L

CONTROLLER

PROGRAMMABLE

PORT

O

P
EN

B

USY

MCPWR

BK

UP

CPU64-EI

P

CJ2H

SYSMAC

NS

MS

COMM

10

M

100M

OUT

IC101

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

Transferring from the CX-Programmer

CPU Unit

Create I/O tables or edit and
then transfer I/O tables.

Registered I/O tables

When the CPU is turned ON, the system
checks if the contents of the registered I/O
tables and the mounting conditions of the
Units are the same.

PERIPH

ER

AL

ER

R

/

ALM

R
U

N

INH

C

O

MM

P

RP

HL
C
ON

TR

OLLER

P
R

OGRA

MMAB

LE

PORT

OPE

N

B
USY

M
CP

W

R

BK

UP

CPU64

-

EIP

CJ

2H

SYSMA

C

NS

MS

C

O

M
M

1

0
M

1

0

0
M

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

Transferring from the CX-Integrator

CPU Unit

Transfer the routing tables.

Routing tables

Network addresses are
assigned.

4 CPU Unit Initialization

4-6

CJ2 CPU Unit Software User’s Manual

z CPU Bus Unit Setup Area

If specific CPU Bus Units, such as Ethernet Units, Controller Link Units, or FL-net Units are used,
the particular settings for each of those Units must be made and transferred to the CPU Unit.

Example: Using an Ethernet Unit
Make the Ethernet settings using the CX-Programmer.
To make Ethernet settings, right-click the Ethernet Unit in the I/O tables of the CX-Programmer, and

then select Edit CPU Bus Unit Settings.
Make the settings f or the Ethernet Unit in t he I/O ta b les of the CX-Prog r ammer, and then transf er the

I/O tables to the CPU Unit.

Additional Information

If user-set data link tables are to be used with a Controller Link Unit, set the data link tables and
then save them in the CPU Unit.

PERIPHERAL

ERR/ALM

RUN

INH

COMM

PRPHL

CONTR

OLLER

PROGRAMM

ABLE

PO

RT

OPEN

BUSY

MC

PWR

BKUP

CPU64-EIP

CJ2H

SYSMAC

NS

MS

C
O

M

M

10M

100M

RD2

SD2

RDY

NO.

UNIT

ERH

NO.

NODE

ERC

RUN

ETN11

RD1

TER1

SD1

ETHRNE

T

Transferring from the CX-Programmer

CPU Unit

Ethernet Unit

Ethernet setup

Make settings for the Unit
in the I/O tables and then
transfer the settings to the
Ethernet Unit.

4-7

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-1 Overview of CPU Unit Initialization

4

4-1-1 CPU Unit Initial Settings

z DM Area Word Allocations for Special I/O Units and CPU Bus Units

If a Special I/O Unit or CPU Bus Unit is used, make the settings for the words allocated in the DM
Area, and then transfer the settings to the CPU Unit.

Use one of the following methods to set the allocated DM Area words with the CX-Programmer.

• Right-click each Special I/O Unit or CPU Bus Unit in the I/O tables, and then select Edit CPU Bus
Unit Settings to set the allocated DM Area words.

• Set the allocated DM Area word in PLC memory.

Set the allocated DM Area words for each Special I/O Unit or CPU Bus Unit with the CX-Program­mer, and then transfer the settings to the CPU Unit.

PERIPHERAL

ERR/ALM

RUN

INH

COMM

PRPHL

CONTR

OL

LER

P

ROGRAMMA

BLE

PORT

OPEN

BUSY

M

CPWR

BKU

P

CPU64-EIP

CJ2H

SYSMAC

N

S

MS

C
OM

M

10M

100M

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

2

ON

4

TERM

RD2

SD2

RDY

NO.

UNIT

ERH

OFF

WIRE

ERC

RUN

SCU41

RD1

TER1

SD1

PORT1
(RS422
/485)

PORT2

Transferring from the CX-Programmer

Make the settings for the Unit
in the I/O tables and then transfer
the settings to the CPU Unit.

Special I/O Unit or CPU Bus Unit

CPU Unit

Settings in allocated
DM Area words for
Special I/O Unit or
CPU Bus Unit

Settings for allocated DM Area words in PLC memory

Or

4 CPU Unit Initialization

4-8

CJ2 CPU Unit Software User’s Manual

4-2 PLC Setup

The PLC Setup contains the basic settings for the CPU Unit. Parameters in the PLC Setup must be
changed if the CJ2 CPU Unit is to be used with specifications that are not the defaults. The param eters
in the PLC Setup are set by using the CX-Progr ammer.

For details on the PLC Setup, refer to Section 9 PLC Setup.

4-9

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-3 Creating I/O Tables

4

4-3-1 I/O Tables

4-3 Creating I/O Tables

You must create I/O tables only in the following cases. I/O tables are created by using the CX-Program­mer.

• To check for incorrect connections

•To reserve words
It is not necessary to create I/O tables if checking for incorrect connection is not required and automatic

allocation is acceptable.

The type and location of Units connected to the CPU Unit are registered in the I/O tables. If I/O tables
are created, the system will check if the types and locations of the Units actually connected to the CPU
agree with the data registered in the I/O tables when the CPU Unit is tuned ON.

The I/O tables can be made based on the actually conne cted Units when the CX-Pro g r ammer is online ,
or they can be manually set when the CX-Programmer is offline and then transferred to the CPU Unit.

The CPU Unit automatically verifies with the connected Units (actua l I/O tables) mounted to it according
to this data.

• If there is a mismatch, an I/O setting error will occur, and operation will not start.

4-3-1 I/O Tables

00 01 02

00 0000 CJ1W-ID201
01 2000 CJ1W-AD041-V1

CJ2H-CPU68-EIP

02 1500 CJ1W-CLK21-V1
03 0001
04 0001

CX-Programmer

I/O Tables

CPU Unit

CJ1W-ID201
Basic I/O Unit

CJ1W-AD041-V1
Special I/O Unit

CJ1W-CLK21-V1
CPU Bus Unit

Open slot

Open slot

Units

Unit type

I/O memory
area address

Location
(slot number)

I/O tables can be made using the
CX-Programmer online for the actual
Units or edited offline as desired and
then transferred to the CPU Unit.

4 CPU Unit Initialization

4-10

CJ2 CPU Unit Software User’s Manual

With automatic allocation, I/O tables are not created by the user. Every time the power supply is turned
ON, I/O memory will be allocated to each Unit based on the locations of the Units. The allocated mem­ory is used for data exchan ge with the Units.

There are no registered I/O tables, and the system will not check the Unit configuration.

With manual allocation, the user creates I/O tables called registered I/O tables.
You can create I/O tables by using one of the following methods with the CX-Programmer.

• Creating I/O Tables Based on the Actual Unit Configuration
With this method, I/O tables are autom atically created based on t he configur ation of actually m ounted
Units with the CX-Programmer connected online.

• Editing I/O Tables Manually and Transferring Them to the CPU Unit
With this method, the I/O tables are manually creat ed offline by registering each Unit in the desired
location using the CX-Programmer, and the completed I/O tables are transferred to the CPU Unit.

Whichever method is used, an I/O Setting Error will occur (A401.10 will turn ON) and operation will not
start if the configuration of connected Units is differ ent from th e unit configur ation in the I/O tab l es when
the PLC is turned ON.

For details on I/O allocation methods, refer to 8-1 I/O Allocations. For details on creating I/O tables,
refer to 8-2 Setting CPU Bus Units and Special I/O Units.

4-3-2 Automatic Allocation

4-3-3 Manual Allocation

00 0000 CJ1W-ID201
01 2000 CJ1W-AD041-V1

CJ2H-CPU68-EIP

02 1500 CJ1W-CLK21-V1
03 0001
04 0001

00 01 02

I/O Tables

CPU Unit

CJ1W-ID201
Basic I/O Unit

CJ1W-AD041-V1
Special I/O Unit

CJ1W-CLK21-V1
CPU Bus Unit

Open slot
Open slot

Units

Units

Unit type

I/O memory
area address

Location
(slot number)

Automatic allocation

4-11

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-4 Setting Routing Tables

4

4-4-1 Routing Tables

4-4 Setting Routing Tables

Settings for routing tables must be made with the CX-Integrator if more than one FINS N etwork Com­munications Unit is mounted to the PLC and the following operations are to be performed.

• The network that is being accessed is switched from Support Software or an instruction in a ladder
program.

• Communications are performed across network layers.

A communications method called FINS is used between OMRON Network Communications Units
(CPU Bus Units). The transmission path, h owever, is not specified in the FINS protocol. Routing tables
define the network address settings and communications paths required when FINS netwo rk communi­cations are performed.

Network addresses for the following Units are set in the routing tables.

• Network Communications Units for CPU Bus Units:
Controller Link Units, SYSMAC LINK Units, Ethernet Units, EtherNet/IP Units used for FINS network
communications, DeviceNet Units, and FL-net Units

• Built-in EtherNet/IP por t on the CJ2H-CPU6@-EIP and CJ2M-CPU3@ when used for FINS network
communications

• Serial ports on Serial Communications Units when communications are performed across network
layers using serial gateway

Network Communications Units classified as Special I/O Units (e.g., CompoNet Master Units) do not
need to be set in the routing tables.

4-4-1 Routing Tables

Applicable Units

4 CPU Unit Initialization

4-12

CJ2 CPU Unit Software User’s Manual

Routing tables consist of the following two tables.

z Local Network Table

Network addresses from 1 to 127 are set for the Network Communications Units (CPU Bus Units)
connected in the local PLC. The local network table is used by the CPU Unit to identify Network
Communications Units mounted to the local PLC an d the correspondi ng communicat ions netw orks if
more than one Network Communications Unit is mounted to the PLC.

The local network table gives the unit number of the Network Communications Unit connected in the
local PLC and the corresponding address of the FINS network connected to that Unit for FINS commu­nications.

z Relay Network Table

A relay network table is set to perform FINS communications across network layers. The relay network
table tells how to rela y comm unica tio ns until the messa ge reache s t he fi nal dest in ation. The table gives
the network address and node address of the first relay point (i.e. first point to reach) on the route to a
destination network (final network) to which the local PLC is not connected.

The destination network is reached by progressing thr oug h th e re lay points.

Tables Comprising Routing Tables

This table shows which Network Communications Unit
connected in the local PLC must be passed through to
reach a specified network.

Unit number: A

Unit number: B

Unit number: C

Local PLC

Local Network Table

Network address

a
b
c

Unit number

A
B
C

Network c

Network b

Network a

b

a

m

Relay Network Table Relay Network Table

Relay

Node

address

Network

address

Destination network

address

(final destination)

Destination network

address

(final destination)

Relay

Node

address

Network
address

a

b

n

Message addressed to network
“a” is received.

Node n

Node m

Message addressed to
network “b” is received.

Network b

Network a

4-13

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-4 Setting Routing Tables

4

4-4-2 Cases in Which Routing Tables Are

Required

Set the routing tables (local network table and relay network table) in the CPU Unit as required by the
application.

Precautions for Correct UsePrecautions for Correct Use

Conditions Required for a Local Network Table
A local network table is required if there is more than one Network Communications Unit con-

nected in the PLC even when relaying is not performed.

The following table shows whether routing tables are required or not according t o the network usage
conditions.

*1 Set the remote network address to 0 if a node in the network will be accessed using a Programming Device.
*2 If there is no local network table and access is made with the network address set to 0 using a Programming

Device or an instruction in a ladder program, the network with the Networ k Co mmunica tions Unit w ith the low­est unit number will be accessed automatically in FINS communications. In this way, the network can be
accessed by setting the lowest unit number for the Network Communications Unit in the network to be
accessed without setting local network tables.

*3 Relay network tables do not need to be set if communications will not be performed across network layers.

4-4-2 Cases in Which Routing Tables Are Required

Network usage

condition

System configuration

Routing tables

Local net-

work table

Relay net­work table

A Network Communi­cations Unit is not
connected in the PLC
or only a Network
Communications Unit
classified as a Spe­cial I/O Unit (e.g.,
CompoNet) is con-

nected.

*1

Not required Not required

More than one Com­munications Unit clas­sified as CPU Bus
Units is connected in
the PLC.

Required for
all PLCs in
the net-

works

*2

Required if
communica­tions will be
performed
across net­work layers.

*3

CX-Programmer

Only Network Communications Units
classified as Special I/O Units

Local PLC

Message
communications

CompoNet

One network = Local network
Network address = 0

Communi­cations
instruction

CX-Programmer

It is necessary to specify which of the Network
Communication Units to pass through.

Local PLC

Message
communications

Communi­cations
instruction

Multiple
networks
Set more
than one
network
address.

4 CPU Unit Initialization

4-14

CJ2 CPU Unit Software User’s Manual

1 Start the CX-Integrator.
2 Select Start Routing Table from the Tools Menu.

3 Select FINS Local.
4 Edit the routing tables on the Table View Tab Page.

5 Connect the CX-Integrator online, and then select Transfer to PLC from the Options Menu to

transfer the routing tables to the CPU Unit.

6 Select Save Local Routing Table File from the File Menu.

Precautions for Correct UsePrecautions for Correct Use

Routing Table Data File
The routing tables are stored in an individual file (.rtg) created with the CX-Integrator. It is not
included in the CX-Programmer project file (.cxp).

4-4-3 Setting and Transferring Routing Tables

4-15

4 CPU Unit Initialization

CJ2 CPU Unit Software User’s Manual

4-5 Setting Allocated DM Area Words for Special I/O Units and CPU

Bus Units

4

4-5-1 Setting Allocated DM Area Words for

Special I/O Units and CPU Bus Units

4-5 Setting Allocated DM Area Words for

Special I/O Units and CPU Bus Units

These settings must be made if Special I/O Units or CPU Bus Units are used. Set the DM Area words
allocated to Special I/O Units and CPU Bus Units using the CX-Programmer.

The initial settings for Special I/O Units and CPU Bus Units are made words allocated to the Unit in the
DM Area of the I/O memory in the CPU Unit. The settings in the allocated DM Area words are trans­ferred to the Special I/O Units and CPU Bus Units from the CPU Unit when the power supply is turned
ON.

The allocated DM Area words are allocated from the following addresses

z Initial Settings for Special I/O Units

One hundred words per Unit are allocated from between D20000 and D29599 according to the unit
number set on the rotary switches on the front of the Unit.

z Initial Settings for CPU Bus Units

One hundred words per Unit are allocated from between D30000 to D31599 according to the unit
number set on the rotary switches on the front of the Unit.

The actual settings and transfer timing for the allocated DM words depend on the type of Special I/O
Unit and CPU Bus Unit and area. For details, refer to the operation manual for the Special I/O Unit or
CPU Bus Unit.

Additional Information

Settings for Special I/O Units and CPU Bus Units are also contained in the CPU Bus Unit Setup
Area for specific Units, such as Ethernet Units and Controller Link Units, and data and programs
are also stored in Special I/O Units and CPU Bus Units (created using the Support Software for
the specific Unit).

Make the settings using one of the following methods.

• Select the Units in the PLC I/O Table Window of the CX-Programmer, make the settings for the Spe­cial I/O Units and CPU Bus Units, and then tr ansfer the settings to the CPU Unit.

• Set the data for individual addresses in the allocated DM Area words in the PLC Memory Window of
the CX-Programmer, and then transfer the settings to the CPU Unit.

• Set the data for individual addresses in th e allocated DM Area words by using MOV(021) or other
instructions in the user program.

Refer to 8-2 Setting CPU Bus Units and Special I/O Units for the procedure for allocating DM Area
words to CPU Bus Units and Special I/O Units with the CX-Programmer.

4-5-1 Setting Allocated DM Area Words for Special I/O Units and CPU

Bus Units

4-5-2 Setting Procedure

4 CPU Unit Initialization

4-16

CJ2 CPU Unit Software User’s Manual

4-6 CPU Bus Unit Setup Area

A setup area stores the settings for specific CPU Bus Units mounted to the CPU Unit. The following
three types of Units and settings use this area.

• Ethernet Units: Ethernet settings

• Controller Link Units: Data link tables (when user-set tables are used)

• FL-net Units: FL-net settings

Make the settings using the following Support Software.

The maximum amount of memory that can be used for the CPU Bus Unit Setup Area is 10,752 bytes.
Design the system so that the memory used for the CPU Bus Unit Setup Area is within the limit accord­ing to the combination of CPU Bus Units in the PLC. If the limit is exceeded, some Units may operate
only at the default settings, and some may not operate.

z Memory Used for CPU Bus Unit Setup Area

Units that use 0 bytes do not use the CPU Bus Unit Setup Area.

4-6-1 CPU Bus Unit Setup Area

4-6-2 Setting Procedure

Data Support Software

Ethernet Unit settings Make the settings for the Special I/O Unit or CPU Bus Unit in the

I/O tables of the CX-Programmer or make the setting using HTML.
Controller Link Unit data link tables Make the settings using data link tables in the CX-Integrator.
FL-net Unit settings Make the settings using the CX-FLnet FL-net Support Software.

Memory Used for CPU Bus Unit Setup Area

Unit Model

Size used

(bytes)

Controller Link Unit CJ1W-CLK21-V1 512
Ethernet Unit CJ1W-ETN11 412

CJ1W-ETN21 994
FL-net Unit CJ1W-FLN22 988
EtherNet/IP Unit CJ1W-EIP21 0
Serial Communications Unit CJ1W-SCU21/31/41-V1

CJ1W-SCU22/32/42
DeviceNet Unit CJ1W-DRM21
Position Control Unit CJ1W-NCF71
Motion Control Unit CJ1W-MCH71
Storage and Processing Unit CJ1W-SPU01-V2

5-1

CJ2 CPU Unit Software User’s Manual

5

This section describes the basics of programming CJ2 CPU Units.

5-1 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

5-1-1 Programming Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

5-1-2 Basic Ladder Diagram Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

5-1-3 ST Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

5-1-4 SFC Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

5-2 Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

5-2-1 Overview of Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

5-2-2 Cyclic Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

5-2-3 Interrupt Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

5-2-4 Designing Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28

5-3 Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38

5-3-1 Overview of Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38

5-4 Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40

5-4-1 Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40

5-4-2 Features of Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-41

5-4-3 Function Block Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-42

5-5 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45

5-5-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45

5-5-2 Types of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-46

5-5-3 Global Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-48

5-5-4 Local Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-48

5-5-5 Network Symbols (CJ2H-CPU6@-EIP and CJ2M-CPU3@ Only) . . . . . . . . . 5-49

5-5-6 Variables in Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-53

5-5-7 Symbol Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-54

5-5-8 Automatic Address Allocation to Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-59

5-6 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-60

5-6-1 Basic Understanding of Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-60

5-6-2 Specifying Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-67

5-6-3 Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-75

5-6-4 I/O Refresh Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-79

Understanding Programming

5 Understanding Programming

5-2

CJ2 CPU Unit Software User’s Manual

5-7 Index Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-84

5-7-1 What Are Index Registers? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-84

5-7-2 Using Index Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-84

5-7-3 Processing Related to Index Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-88

5-7-4 Monitoring Index Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-89

5-7-5 Sharing Index and Data Registers between Tasks . . . . . . . . . . . . . . . . . . . . .5-90

5-8 Specifying Address Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-92

5-8-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-92

5-8-2 Examples of Address Offset Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-95

5-9 Checking Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-96

5-9-1 Errors during CX-Programmer Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-96

5-9-2 Program Checks with the CX-Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . .5-96

5-9-3 Debugging with the Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-97

5-9-4 Program Execution Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-100

5-10 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-103

5-10-1 Condition Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-103

5-10-2 Special Program Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-108

5-3

5 Understanding Programming

CJ2 CPU Unit Software User’s Manual

5-1 Programming

5

5-1-1 Programming Overview

5-1 Programming

User programs are created by using the CX-programmer. Programs consist of the following parts.

•Programs
The entire user program consists of multiple programs. Each program ends with an END(001)
instruction.

• Tasks (Smallest Executable Unit)
A program is assigned to a task to execute it. (In the CX-Programmer, the task number is specified in
the properties as a program attribute.) Tasks include cyclic tasks (executed with normal cyclic pro­cessing), interrupt tasks (executed when interrupt conditions have been completed), scheduled inter­rupt tasks (executed at specified intervals), and the power OFF interrupt task (executed when the
power is interrupted).

• Sections
When creating and displaying programs with the CX-Programmer, the one program can be divided
into any number of parts. Each part is called a section. Sections are generally made to make the pro­gram easier to understand.

• Subroutines and Function Blocks
In one program, you can create subroutine programs and function blocks.

5-1-1 Programming Overview

Structure of User Programs

CPU Unit

User program

Program

Program

Program

Task 1

Task 2

Task n

The user program consists of
multiple programs. Each program is
allocated to a task. Tasks are
executed in order of task numbers.

Programs are
assigned to tasks
for execution.

5 Understanding Programming

5-4

CJ2 CPU Unit Software User’s Manual

The entire user program is saved in a CX-Programmer project file (.CXP) with other parameters, such
as symbol tables, PLC Setup data, I/O tables, and I/O memory data.

Programs can be written using any of the following three programming languages.

• Ladder diagrams

• Structured text (ST)

• Sequential function charts (SFC)
Programs written in ladder diagrams, ST, or SFC assigned to tasks to execute them.

You can use the best language for each process by using different languages for different purposes,
such as ladder programming for the device control or ST for mathematical processing.

User Program Data

Programming Languages

.CXP

Symbol tables

PLC Setup

I/O tables

I/O memory data

CX-Programmer
project file

User program

User Program

Task

Task

Task

Task

SFC:
Step Progression
Control

Ladder:
Device Control

ST:
Mathematical
Processes

Programming
Language Best
Suited to the
Process is
Selectable

a: = a + 1;

5-5

5 Understanding Programming

CJ2 CPU Unit Software User’s Manual

5-1 Programming

5

5-1-1 Programming Overview

Each language can be used in the following locations.

The following addressing methods can be used for each language.

*1 Physical addresses can be used by assigning them to symbols.
*2 Physical address and symbols can be used in Boolean actions and transitions in SFC charts.

The maximum program capacities of the CJ2 CPU Units for all user programs (i.e., the total capacity for
all tasks) are given in the following table.

It is possible to check the program capacity by selecting View

−

Memory View in the CX-programmer.

The size of a ladder instruction depends on the specific instruction and operands that are used. For
details, refer to A-2 Instruction Execution Times and Number of Steps.

Refer to 5-4-3 Function Bloc k Specifications for the amount of memory used for function blocks.

Location

Language

Tasks

Action programs and transi-

tion programs in SFCs

Algorithms in function

block definitions

Ladder diagrams Yes Yes Yes
ST Yes Yes Yes
SFC Yes --- ---

Addressing method

Language

Physical addresses Symbols

Ladder programming Yes Yes
ST

Depends

*1

Yes

SFC

Depends

*2

Depends

*2

Program Capacity

Model Program capacity I/O capacity

CJ2H-CPU68(-EIP) 400K steps 2,560 points
CJ2H-CPU67(-EIP) 250K steps
CJ2H-CPU66(-EIP) 150K steps
CJ2H-CPU65(-EIP) 100K steps
CJ2H-CPU64(-EIP) 50K steps
CJ2M-CPU@5 60K steps
CJ2M-CPU@4 30K steps
CJ2M-CPU@3 20K steps
CJ2M-CPU@2 10K steps
CJ2M-CPU@1 5K steps

5 Understanding Programming

5-6

CJ2 CPU Unit Software User’s Manual

Ladder diagram logic is a basic language for PLCs that is written in a form that appears similar to elec­trical circuits. Instructions are executed in the order they are recorded in memor y (m nemonic order) . It
is important that you correctly understand the basic programming concepts as well as the execution
order.

z General Structure of the Ladder Diagram

A ladder diagram consists of left and right b us ba rs, connecting lines , input b its, output bits , and spe­cial instructions. A program consists of one or more program runs. A program rung is a unit that can
be partitioned when the bus is split horizontally. In mnemonic form, a rung is all instructions from a
LD/LD NOT instruction to the output instruction just before the next LD/LD NOT instructions. A pro­gram rung consists of instruction bloc ks that begin with an L D/LD NO T instruction indicating a lo gical
start.

Additional Information

With the CX-Programmer, the rung number and first program address on each rung are dis­played at the left of each rung.

5-1-2 Basic Ladder Diagram Concepts

Input bit

Connecting line

Output bit

Rungs

Left bus bar

Special
instruction

Right bus bar

Instruction blocks

0

0

1

2

2

5

1

2 3

4

5 6

Program address: 0

Rung number

First program address
on each rung

5-7

5 Understanding Programming

CJ2 CPU Unit Software User’s Manual

5-1 Programming

5

5-1-2 Basic Ladder Diagram Concepts

z Mnemonics

It has program addresses, and one program address is equivalent to one instruction. Program
addresses contain six digits starting from 0.

Program
Address

Instruction

(Mnemonic)

Operand

0LD0.00
1 AND 0.01
2LD0.02
3 ANDNOT 0.03
4 LDNOT 1.00
5 AND 1.01
6OR LD
7 AND LD
8 OUT 2.00
9END

0.00

0.01

0.02 0.03

0.02

1.00

1.00

5 Understanding Programming

5-8

CJ2 CPU Unit Software User’s Manual

The ST (Structured Text) language is a high-level language code for industrial controls (mainly PLCs)
defined by the IEC 61131-3 standard. The standard control statements, operators, and functions make
the ST language ideal for mathematical processing that is difficult to write in ladder programming. (The

ST language does not support all of the processing that can be written in ladder diagrams. The ST lan­guage that conforms to the IEC 61131-3 standard is supported.

Additional Information

For details on ST programming specifications, notation, and input procedures, refer to the CX­Programmer Operation Manual: Function Blocks and Structured Text (Cat. No. W447).

z Features of ST Programming

• There are many control statements available, such as loop statements and IF-THEN-ELSE state­ments, many operators such as arithmetic operators, comparison operators, and AND/OR opera­tors, as well as many mathematical functions, string extract and merge functions, Memory Card
processing functions, string transfer functions, and trigonometric functions.

• Programs can be written like high-level languages such as C, and comments can be included to
make the program easy to read.

• ST programs can be uploaded and downloaded just like ordinary programs, b ut ST pr ogram tasks
cannot be uploaded and downloaded in task units.

• Function blocks (ladd er or ST language) can be called in ST programs.

• One-dimensional array variables are supported for easier data handling in applications.

z Specifications

5-1-3 ST Language

Item Specification

ST program units • Tasks

• Algorithms for function block definitions

• Action programs and transition programs in SFCs.

Address specifying procedure Addresses are specified using symbols. Any address can be assigned to the

symbol.
Force-setting and force-resetting Supported.
Online editing ST program editing

5-9

5 Understanding Programming

CJ2 CPU Unit Software User’s Manual

5-1 Programming

5

5-1-4 SFC Overview

The SFC (Sequential Function Chart) language is a graphical programming language developed to
facilitate the description of step progression programs, which mainly control sequential processes.

SFC, with its graphical representation of step flow and with description of the conditions for step pro­gression and the actions in each step, allows users to program the control of sequential processes.

Additional Information

For details on SFC programming specifications, notation, and input procedures, refer to the CX­programmer Operation Manual: SFC Programming (Cat. No. W469).

z Features of SFC Programming

Ladder Diagrams and ST as Part of SFC Programs

The step actions and transition conditions within an SFC program can be coded in either ladder dia­grams or ST.

5-1-4 SFC Overview

Process Flow

Processing Contents

Step Transition Condition

Processing Contents

Step Transition Condition

Processing Contents

Step Transition Condition

Step1

Step2

Step3

Action Programs (Ladder)

Action Programs (ST)

Transition Program (Ladder)

Transition Program (ST)

5 Understanding Programming

5-10

CJ2 CPU Unit Software User’s Manual

z Simultaneous Display/Editing of SFC Charts and Action/Transition Programs

Online Editing and Debugging

SFC charts can be edited online. Furthermore, action blocks can be hidden while debugging, and
the step progression status can be checked. The SFC chart editor will display the action programs in
the program view, even while the action blocks are hidden.

z Specifications

Item Specification

SFC program unit Tasks (1 task = 1 SFC chart)
T asks supported for SFC progr am

allocation

Cyclic or extra cyclic tasks

SFC elements Steps, transitions, actions, jumps, subcharts

Note: SFC elements are automatically registered to local variables.
Address specifying method A symbol or a physical address can be specified for a Boolean action or tran-

sition in an SFC. An physical address cannot be specified, however, if ST

programming is used.
Force-setting and force-resetting Transitions can be force-set/force-reset online, for a step-by-step execution.
Online editing En ables SFC editing, action addition/deletion, and transition addition/dele-

tion.