Omron CS1W-SCU31-V1, CS1W-SCB21-V1, CJ1W-SCU31-V1, CJ1W-SCU41-V1, CS1W-SCU41-V1 Operation Manual

Cat. No. W336-E1-09

SYSMAC
CS/CJ Series

CS1W-SCB@@-V1
Serial Communications Boards

CS1W-SCU@@-V1 and
CJ1W-SCU@@-V1
Serial Communications Units

OPERATION MANUAL

SYSMAC CS/CJ Series

Serial Communications Boards and
Serial Communications Units

Operation Manual

Revised February 2008

iv

Notice:

OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.

The following conventions are used to indicate and classify precautions in this manual. Always heed
the information provided with them. Failure to heed precautions can result in injury to people or dam­age to property.

!DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury. Additionally, there may be property damage.

!WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury. Additionally, there may be property damage.

!Caution Indicates a potentially hazardous situation which, if not avoided, may result in minor or

moderate injury, or property damage.

OMRON Product References

All OMRON products are capitalized in this manual. The word “Unit” is also capitalized when it refers to
an OMRON product, regardless of whether or not it appears in the proper name of the product.

The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means
“word” and is abbreviated “Wd” in documentation in this sense.

The abbreviation “PLC” means Programmable Controller. “PC” is used, however, in some Program­ming Device displays to mean Programmable Controller.

Visual Aids

The following headings appear in the left column of the manual to help you locate different types of
information.

 OMRON, 1999

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 with 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.

Note Indicates information of particular interest for efficient and convenient opera-

tion of the product.

1,2,3...

1. Indicates lists of one sort or another, such as procedures, checklists, etc.

v

vi

TABLE OF CONTENTS

PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xx

6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

7 Unit Versions of CS/CJ-series Serial Communications Boards/Units . . . . . . . . . . . . . . . . . xxiv

8 Functions Added in the Unit Version 1.3 Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxviii

9 Functions Added in the Unit Version 1.2 Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxviii

SECTION 1

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

1-1 Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

1-3 Protocol Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-4 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1-5 System Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1-6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

1-7 Comparison to Previous Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

1-8 Selecting the Serial Communications Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

1-9 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

SECTION 2

Initial Settings and I/O Memory Allocations . . . . . . . . . . . . 61

2-1 Component Names and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

2-2 Data Exchange with the CPU Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

2-3 I/O Memory Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

SECTION 3

Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

3-1 Installing a Serial Communications Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

3-2 Installing Serial Communications Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

3-3 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

3-4 RS-232C and RS-422A/485 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

SECTION 4

Using Host Link Communications . . . . . . . . . . . . . . . . . . . . 123

4-1 Host Link Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

4-2 Setup Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

4-3 Auxiliary Area and CIO Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

4-4 Communications Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

4-5 Changes from Previous Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

4-6 Host Link Function for Replacing Existing PLCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

vii

TABLE OF CONTENTS

SECTION 5

Using Protocol Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

5-1 Overview of the Protocol Macro Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

5-2 Setup Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

5-3 Auxiliary Area and CIO Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

5-4 Using Protocol Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

5-5 Simple Backup Function (Backup of Protocol Macro Data). . . . . . . . . . . . . . . . . . . . . . . . . 187

5-6 Enhanced Protocol Macro Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

SECTION 6

Serial Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

6-1 Serial Gateway Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196

6-2 DM Area Allocations (Using Serial Gateway Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

6-3 Auxiliary Area and CIO Area in Serial Gateway Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

6-4 Using the Serial Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

6-5 Protocol Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

6-6 Serial Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

6-7 Conditions Requiring Routing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

6-8 Communications Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

SECTION 7

No-protocol Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

7-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

7-2 Allocation DM Area for No-protocol Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

7-3 Auxiliary Area and CIO Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

7-4 Basic Operating Procedure in No-protocol Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

SECTION 8

Using 1:N NT Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

8-1 Overview of 1:N NT Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

8-2 Setup Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

8-3 Auxiliary Area and CIO Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

SECTION 9
Using Modbus-RTU Slave Mode

(Unit Version 1.3 or Later). . . . . . . . . . . . . . . . . . . . . . . . . . . 273

9-1 Modbus-RTU Slave System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

9-2 Setup Area Allocations (Modbus-RTU Slave Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

9-3 Auxiliary Area and CIO Area Allocations (Modbus-RTU Slave Mode) . . . . . . . . . . . . . . . 278

9-4 Communications Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290

9-5 Changes from Previous Products. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

9-6 Modbus-RTU Slave Function for Replacing Existing PLCs. . . . . . . . . . . . . . . . . . . . . . . . . 298

viii

TABLE OF CONTENTS

SECTION 10

Loopback Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

10-1 Executing Loopback Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304

10-2 Setup Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

10-3 CIO Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

SECTION 11

Troubleshooting and Maintenance . . . . . . . . . . . . . . . . . . . . 307

11-1 Indicator Error Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

11-2 Status Area Error Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311

11-3 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

11-4 Error Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

11-5 Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

11-6 Replacement Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .355

Appendices

A Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

B CompoWay/F Master Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

C C-mode (Host Link) Command Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

D Host Link FINS Command Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

E Mitsubishi Computer Link Master (A-compatible 1C Frame, Model 1) . . . . . . . . . . . . . . . 441

FE5@K Digital Controller Read Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

GE5@K Digital Controller Write Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

H E5ZE Temperature Controller Read Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501

I E5ZE Temperature Controller Write Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523

JE5@J Temperature Controller Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543

KES100@ Digital Controller Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559

LK3T@ Intelligent Signal Processor Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599

M V500/V520 Bar Code Reader Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 621

N 3Z4L Laser Micrometer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633

O Visual Inspection System Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669

P V600/V620 ID Controller Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689

Q Hayes Modem AT Command Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 727

R Changing Communications Port Settings Using STUP(237) . . . . . . . . . . . . . . . . . . . . . . . 735

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749

ix

x

About this Manual:

This manual describes the installation and operation of the SYSMAC CS/CJ-series CS1W-SCB@@-V1
Serial Communications Boards and CS1W-SCU@@-V1 and CJ1W-SCU@@-V1 Serial Communica­tions Units and includes the sections described on the next page.

The Serial Communications Boards are classified as Inner Boards and the Serial Communications
Unit is classified as a CPU Bus Unit.

Please read this manual and all related manuals listed in the following table carefully and be sure you
understand the information provided before attempting to install and operate a Serial Communications
Board or Unit.

Name Cat. No. Contents

SYSMAC CS/CJ-series
CS1W-SCB@@-V1, CS1W-SCU@@-V1,
CJ1W-SCU@@-V1
Serial Communications Boards and
Serial Communications Unit Operation Manual (this
manual)

SYSMAC CS/CJ-series
CQM1H-PRO-E1, CQM1-PRO01-E,
C200H-PRO27-E
Programming Consoles Operation Manual

SYSMAC CS-series CS1G/H-CPU@@H, CS1G/H-
CPU@@-EV1
Programmable Controllers Operation Manual

SYSMAC CJ-series
CJ1G/H-CPU@@H, CJ1M-CPU@@,
CJ1G-CPU@@
Programmable Controllers Operation Manual

SYSMAC CS/CJ-series CS1G/H-CPU@@-EV1,
CS1G/H-CPU@@H,
CJ1G-CPU@@-E, CJ1G/H-CPU@@H
Programmable Controllers Programming Manual

SYSMAC CS/CJ-series CS1G/H-CPU@@H, CS1G/
H-CPU@@-EV1, CJ1G/H-CPU@@H, CJ1G-CPU@@,
CJ1M-CPU@@
Programmable Controllers
Instructions Reference Manual

SYSMAC CS/CJ-series
CS1G-/H-CPU@@H, CS1G/H-CPU@@-E, CS1W­SCB@@-V1, CS1W-SCU@@-V1, CJ1G/H-CPU@@H,
CJ1G-CPU@@, CJ1W-CPU@@, CJ1W-SCU@@-V1
Communications Commands Reference Manual

SYSMAC WS02-CXPC1-E-V60
CX-Programmer Operation Manual

SYSMAC WS02-PSTC1-E
CX-Protocol Operation Manual

SYSMAC CS/CJ-series
CS1W-ETN01, CS1W-ETN11, CJ1W-ETN11
Ethernet Unit Operation Manual

W336 Describes the use of Serial Communications Unit

and Boards to perform serial communications with
external devices, including the usage of standard
system protocols for OMRON products.

W341 Provides information on how to program and operate

CS/CJ-series PLCs using a Programming Console.

W339 Describes the installation and operation of the CS-

series PLCs.

W393 Describes the installation and operation of the CJ-

series PLCs.

W394 Describes the ladder diagram programming functions

and other functions supported by CS-series and CJ­series PLCs.

W340 Describes the ladder diagram programming instruc-

tions supported by CS-series and CJ-series PLCs.

W342 Describes the Host Link and FINS communications

commands used with CS-series and CJ-series PLCs.

W446 Provides information on how to use the CX-Program-

mer, a programming device that supports the CS­series and CJ-series PLCs.

W344 Describes the use of the CX-Protocol to create proto-

col macros as communications sequences to com­municate with external devices.

W343 Describes the installation and operation of CS1W-

ETN01, CS1W-ETN11, and CJ1W-ETN11 Ethernet
Unit.

xi

About this Manual, Continued

This manual contains the following sections.

Section 1 introduces the hardware and software functions of the Serial Communications Boards and
the Serial Communications Units, including the communications modes, system configurations, and
specifications.

Section 2 describes the components of the Serial Communications Boards and the Serial Communi­cations Units, the settings required for operation, and the memory allocated in the I/O memory of the
CPU Unit for controlling and monitoring communications.

Section 3 describes how to mounting the Serial Communications Boards and Serial Communications
Units, and how to connect the ports to external devices.

Section 4 describes the procedure and other information required to use Host Link communications.

Section 5 describes the procedure and other information required to use protocol macros.

Section 6 provides an overview of the Serial Gateway, information on I/O memory allocations, and

procedures for using the functions. Information on protocol conversion, routing table requirements, and
communications frames is also provided. The Serial Gateway can be used only for Unit Ver. 1.2 or
later.

Section 7 describes the procedure and other information required to use the no-protocol mode. This
mode is supported for Unit Ver. 1.2 or later only.

Section 8 describes the procedure and other information required to use 1:N NT Links to Programma­ble Terminals.

Section 9 describes the procedure and other information required to use Modbus-RTU slave mode.

Section 10 describes the procedure and other information required to conduct loopback test to check

the serial ports.

Section 11 describes the troubleshooting and maintenance procedures for the Serial Communications
Boards and the Serial Communications Units.

Appendix A to Appendix Q provide the specifications of the standard system protocols.

Appendix R provides information on using STUP(237) to change serial port settings.

!WARNING Failure to read and understand the information provided in this manual may result in per-

sonal injury or death, damage to the product, or product failure. Please read each section
in its entirety and be sure you understand the information provided in the section and
related sections before attempting any of the procedures or operations given.

xii

Read and Understand this Manual

Please read and understand this manual before 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 REPRESENTATION, 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 OMRON for any act exceed 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.

xiii

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 exhaustive list of all possible uses of the products, nor is it intended 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.

xiv

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 doubt, 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

Performance 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.

xv

xvi

PRECAUTIONS

This section provides general precautions for using the CS/CJ-series Serial Communications Boards and Units.

The information contained in this section is important for the safe and reliable application of Programmable
Controllers. You must read this section and understand the information contained before attempting to set up or
operate a PLC system.

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

6-1 Applicable Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

6-2 Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

6-3 Conformance to EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii

6-4 EMI Measures for Serial Communications Boards and Units . . . . . xxiii

6-5 EMS Measures for Serial Communications Units . . . . . . . . . . . . . . xxiv

7 Unit Versions of CS/CJ-series Serial Communications Boards/Units . . . . . . xxiv

8 Functions Added in the Unit Version 1.3 Upgrade . . . . . . . . . . . . . . . . . . . . . xxviii

9 Functions Added in the Unit Version 1.2 Upgrade . . . . . . . . . . . . . . . . . . . . . xxviii

xvii

Intended Audience 1

1 Intended Audience

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 charge of designing FA systems.

• Personnel in charge of managing FA systems and facilities.

2 General Precautions

The user must operate the product according to the performance specifica­tions described in the operation manuals.

Before using the product under conditions which are not described in the
manual or applying the product to nuclear control systems, railroad systems,
aviation systems, vehicles, combustion systems, medical equipment, amuse­ment machines, safety equipment, and other systems, machines, and equip­ment that may have a serious influence on lives and property if used
improperly, consult your OMRON representative.

Make sure that the ratings and performance characteristics of the product are
sufficient for the systems, machines, and equipment, and be sure to provide
the systems, machines, and equipment with double safety mechanisms.

This manual provides information for programming and operating the Unit. Be
sure to read this manual before attempting to use the Unit and keep this man­ual close at hand for reference during operation.

!WARNING It is extremely important that a PLC and all PLC Units be used for the speci-

fied purpose and under the specified conditions, especially in applications that
can directly or indirectly affect human life. You must consult with your OMRON
representative before applying a PLC System to the above-mentioned appli­cations.

3 Safety Precautions

!WARNING 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 PLC or another external factor
affecting the PLC operation. Not doing so may result in serious accidents.

• Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.

• The PLC will turn OFF all outputs when its self-diagnosis function detects
any error or when a severe failure alarm (FALS) instruction is executed.
As a countermeasure for 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.

• When the 24-V DC output (service power supply to the PLC) is over­loaded or short-circuited, the voltage may drop and result in the outputs

xviii

Operating Environment Precautions 4

being turned OFF. As a countermeasure for such problems, external
safety measures must be provided to ensure safety in the system.

!WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing

so may result in electric shock.

!WARNING Do not touch any of the terminals or terminal blocks while the power is being

supplied. Doing so may result in electric shock.

!WARNING Do not attempt to disassemble, repair, or modify any Units. Any attempt to do

so may result in malfunction, fire, or electric shock.

!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.

4 Operating Environment Precautions

!Caution Do not operate the control system in the following places:

• 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.

!Caution 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.

!Caution The operating environment of the PLC System can have a large effect on the

longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified condi­tions at installation and remains within the specified conditions during the life
of the system. Follow all installation instructions and precautions provided in
the operation manuals.

xix

Application Precautions 5

5 Application Precautions

Observe the following precautions when using the PLC System.

!WARNING Always heed these precautions. Failure to abide by the following precautions

could lead to serious or possibly fatal injury.

• Always connect to a ground of 100
connecting to a ground of 100

• 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,
Serial Communications Units, or any other Units.

• Assembling the Units.

• Setting DIP switches or rotary switches.

• Connecting cables or wiring the system.

• Mounting or dismounting terminal blocks.

!Caution Failure to abide by the following precautions could lead to faulty operation of

the PLC or the system, or could damage the PLC or PLC Units. Always heed
these precautions.

• 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.

• 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.

• Tighten the mounting screws at the bottom of Serial Communications
Units to a torque of 0.4 N
malfunction.

• 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 proper heat dis­sipation. Leaving the label attached may result in malfunction.

• Always check polarity before wiring RS-422A/485 connectors. The polar­ity for the SDA/B and RDA/B signals can be different for some external
devices.

• Check to be sure that terminating resistors have been correctly installed
for RS-422A/485 systems before starting operation.

• Disconnect the LG terminal of the Power Supply Unit from the GR termi­nal when performing insulation and dielectric strength tests.

• Never turn OFF the power supply while writing protocol macro data.

• Wire all connections correctly according to instructions in this manual.

• Check terminal blocks completely before mounting them.

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

⋅m. An incorrect tightening torque may result in

Ω or less when installing the Units. Not

Ω or less may result in electric shock.

xx

Application Precautions 5

• Be sure that the Bus Connection Unit and other items with locking devices
are properly locked into place. Improper locking may result in malfunction.

• Check the user program for proper execution before actually running it on
the Unit. Not checking the program may result in an unexpected 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 PLC (including the setting of the
startup operating mode).

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

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

• Do not install the product near devices generating strong high-frequency
noise.

• Do not drop the product or subject it to excessive vibration or shock.

• Observe the following precautions for communications cables.

• Do not lay communications cables near power lines or high-voltage
lines.

• Always lay communications cables in ducts.

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

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

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

• Resume operation only after transferring to the new CPU Unit the con­tents of the DM Area, HR Area, and other data required for resuming
operation. Not doing so may result in an unexpected operation.

• Do not touch circuit boards or the components mounted to them with your
bare hands. There are sharp leads and other parts on the boards that
may cause injury if handled improperly.

• When transporting or storing Boards, wrap them in material that will pro­tect LSIs, ICs, and other components from static electricity and be sure
that they remain within the storage temperature range.

• When creating Host Link FINS command frames using the CMND(490)
instruction, always set the unit number for Host Link incremented by one
(1 to 32) for the remote destination (send destination) node address (word
C+3, bits 08 to 15 of the CMND(490) instruction). Do not set the unit num­ber of the actual Host Link slave (0 to 31). Using the Host Link unit num­ber without incrementing by one will access the PLC with the entered
Host Link unit number less one.
For example, specify the remote PLC with Host Link unit number 2 by
entering 3 for the remote destination node address. If 2 is entered, the
PLC with Host Link unit number 1 will be accessed.
To access a PLC on a Host Link FINS network using the Serial Gateway
from CX-Programmer, however, enter the actual Host Link unit number,
without incrementing by one. (Select Change PLC, click the Display

Serial Gateway Guide Button, and set unit number in the Host Link
SYSWAY Settings field of the Serial Gateway Guide Dialog Box.

xxi

Conformance to EC Directives 6

• When the Serial Gateway is executed during protocol macro execution,
the communications sequence contents and the FINS command recep­tion timing may suspend step transition of the communications sequence
(when the next step does not contain the RECEIVE command, the Serial
Gateway will be executed by interrupting the sequence before the next
step, and the step transition will be suspended).
Use the Serial Gateway send start timeout function to monitor at the
source of the FINS command whether step transition in the communica­tions sequence has been suspended due to execution of the Serial Gate­way. If the converted command does not start to be sent within the set
time, either retry executing the FINS command or change the communi­cations sequence.

• When using 2-wire RS-422A/485 communications in Protocol Macro
Mode, set only modem controls for the send control parameters, and do
not use RS/CS flow controls.

• The following operations will result if the Serial Gateway is executed either
using a pre-Ver. 1.2 Board/Unit or using a Ver. 1.2 or later Unit/Board with­out Serial Gateway or protocol macro mode set for serial communications
at the serial port.

• If either NT Link or loopback test mode is used for serial communica­tions, or if protocol macro mode is used with a pre-Ver. 1.2 Board/Unit,
an undefined command response will be returned (end code: 0401
hex).

• If Host Link mode is used for serial communications, the message will
be converted into a FINS command using Host Link slave-initiated
communications and transferred (this will mainly result in a response
timeout being returned, depending on the remote device (end code:
0205 hex))

• If a no-protocol instruction is sent to a pre-Ver. 1.2 Board/Unit or the serial
port of a Board/Unit with Unit Ver. 1.2 or later using a serial communica­tions mode other than no-protocol mode, the following operations will
occur.

• If TXD(236)/RXD(235) is sent to the Board, Auxiliary Area bit A424204
(Inner Board Service Failure Flag) will turn ON.

• If TXDU(256)/RXDU(255) is sent to the Unit and the serial communi­cations mode is set to protocol macro, NT Link, loopback test, or Serial
Gateway mode, an undefined command error (end code: 0401 hex)
will be returned.
If the serial communications mode is set to Host Link mode and the in­struction will be converted to a slave-initiated function FINS command
and transferred. (Depending on the remote device, a response timeout
(end code: 0205 hex) is likely to be returned.)

6 Conformance to EC Directives

6-1 Applicable Directives

•EMC Directives

• Low Voltage Directive

6-2 Concepts

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

xxii

Conformance to EC Directives 6

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

Note Applicable EMS (Electromagnetic Susceptibility) and EMI (Electromagnetic

Interference) standards in the EMC (Electromagnetic Compatibility) standards
are as follows:

Unit/Board EMS EMI

CS1W-SCB21-V1/
SCB41-V1
CS1W-SCU21-V1

CJ1W-SCU21-V1
CJ1W-SCU31-V1
CJ1W-SCU41-V1
CS1W-SCU31-V1

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 (EN61131-2).

EN61131-2

EN61000-6-2

EN61000-6-4
(Radiated emission: 10-m
regulations)

6-3 Conformance to EC Directives

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

1,2,3...

1. The CS/CJ-series PLC must be installed within a control panel.

2. You must use reinforced insulation or double insulation for the DC power
supplies used for the communications power supply and I/O power sup­plies.

3. CS/CJ-series PLCs complying with EC Directives also conform to the
Common Emission Standard (EN61000-6-4). Radiated emission charac­teristics (10-m regulations) 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.

6-4 EMI Measures for Serial Communications Boards and Units

The CS/CJ-series PLCs conform to the Common Emission Standards
(EN61000-6-4) of the EMC Directives. However, the noise generated from
Serial Communications Board or Unit communications cables may not satisfy
these standards. In such a case, commercially available ferrite cores must be
placed on the communications cable or other appropriate countermeasures
must be provided external to the PLC.

xxiii

Unit Versions of CS/CJ-series Serial Communications Boards/Units 7

Recommended Ferrite Cores

The following ferrite core (data line noise filter) is recommended:

0443-164151 by Fair-Rite Products Corp.
Low impedance, 25 MHz: 90

Ω, 100 MHz: 160 Ω

Recommended Mounting Method

Mount the core on one turn of the communications cable, as shown in the fol­lowing illustration.

Mount the cores as lost to the end of the communications cable as possible,
as shown in the following illustration.

Serial
Commu­nications
Unit/Board

6-5 EMS Measures for Serial Communications Units

The immunity testing conditions for the CJ1W-SCU41-V1 Serial Communica­tions Unit are as follows: A ferrite core is mounted on the test cable connected
to the RS-422A/485 port.

Refer to 6-4 EMI Measures for Serial Communications Boards and Units for
information on mounting the ferrite core.

7 Unit Versions of CS/CJ-series Serial Communications

Boards/Units

Unit Versions

A “unit version” has been introduced to manage CS/CJ-series Serial Commu­nications Units/Boards according to differences in functionality accompanying
upgrades.

1. Unit Version Notation on Products

The unit version code is provided on the nameplate of the CS-series Serial
Communications Boards and Units for which unit versions are being man­aged, as shown below for the Loop Control Board. This system applies to
Serial Communications Units or Boards with unit version 1.2 or later.

• Serial Communications Boards

xxiv

Unit Versions of CS/CJ-series Serial Communications Boards/Units 7

Example: CS1W-SCB21-V1 CS-series
Serial Communications Board

Nameplate

Unit version 1.3

CS1W-SCB21-V1

SERIAL COMMUNICATION BOARD

• Serial Communications Units

Example: CS1W-SCU21-V1 CS-series
Serial Communications Unit

Nameplate

SERIAL COMMUNICATION UNIT

:

Lot No. 051020 Ver.1.3

OMRON Corporation

CS1W-SCU21-V1

MADE IN JAPAN

Unit version 1.3

2. Confirming Unit Versions with Support Software

CX-Programmer version 5.0 can be used to confirm the unit version in the
Unit Manufacturing Information.

■Boards

In the I/O Table Window, right-click on the CPU Unit, and then select Unit
Manufacturing Information – Inner Board

■Units

1. In the I/O Table Window, right-click on the Serial Communications Unit,

and then select Unit Manufacturing Information.

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

Lot No. 051020 0000 Ver.1.3

OMRON Corporation

MADE IN JAPAN

xxv

Unit Versions of CS/CJ-series Serial Communications Boards/Units 7

The unit version is displayed.

Example: In this Unit Manufacturing Information Dialog Box, unit version 1.3 is
displayed. Use this dialog box to confirm the unit version of the Serial Com­munications Unit that is connected online.

3. Using the Unit Version Labels

Unit version labels are provided with the product. These labels can be
attached to the front of previous Serial Communications Boards/Units to dif­ferentiate between Serial Communications Boards/Units of different unit ver­sions.

Unit Version Notation

The unit versions are indicated in this manual as follows:

Notation in product

Ver. 1.3 or later after
the lot number

Ver.1.2 after the lot
number

Blank after the lot
number

nameplate

Notation in this manual Remarks

CS/CJ-series Serial Commu­nications Units with unit ver­sion 1.3 or later

CS/CJ-series Serial Commu­nications Units with unit ver­sion 1.2

Pre-Ver. 1.2 CS/CJ-series
Serial Communications Units

Information for which no par­ticular version is specified
applies to all unit versions.

xxvi

Unit Versions of CS/CJ-series Serial Communications Boards/Units 7

Function Support by Unit Version

Product Earlier version

CS Series Serial Communica-

tions Boards

Serial Communica­tions Units

CJ Series Serial Communica-

tions Units

Serial gateway Not supported Supported Supported (Same as pre-

Host Link 1:1 links Not supported Supported Supported (Same as pre-

Host Link compatible
device selection

No-protocol Not supported Supported Supported (Same as pre-

Protocol
macro

Functions

Standard system protocol addi­tions

MODBUS slave protocol added --- --- Supported

Link word specifica­tion data exchange
timing

Reception buffer pro­cessing for
PMCR(260) instruc­tion execution

Baud rate (bps) 38,400 max. (57,600 and

(pre-ver. 1.2)

CS1W-SCB21-V1 CS1W-SCB21-V1 (Same

CS1W-SCB41-V1 CS1W-SCB41-V1 (Same

CS1W-SCU21-V1 CS1W-SCU21-V1 (Same

--- --- CS1W-SCU31-V1
CJ1W-SCU21 CJ1W-SCU21-V1 CJ1W-SCU21-V1 (Same

--- --- CJ1W-SCU31-V1
CJ1W-SCU41 CJ1W-SCU41-V1 CJ1W-SCU41-V1 (Same

Not supported Supported Supported (Same as pre-

On-request I/O refresh­ing only

Clearing only Select to clear or hold

115,200 not supported)
Not supported Supported Supported (Same as pre-

Unit version 1.2 Unit version 1.3

CS1W-SCB21-V1 (Same

as pre-ver. 1.2)

as pre-ver. 1.2)

as pre-ver. 1.2)

On-request I/O refreshing
Continuous I/O refreshing

contents.

57,600 supported. 57,600 supported. (Same

as pre-ver. 1.2)
CS1W-SCB41-V1 (Same

as pre-ver. 1.2)
CS1W-SCU21-V1 (Same

as pre-ver. 1.2)

as pre-ver. 1.2)

as pre-ver. 1.2)

ver. 1.2)

ver. 1.2)

ver. 1.2)

ver. 1.2)
On-request I/O refreshing

Continuous I/O refreshing
(Same as pre-ver. 1.2)

Select to clear or hold con­tents. (Same as pre-ver.

1.2)

as pre-ver. 1.2)

ver. 1.2)

Note Make sure that a CS/CJ-series CPU Unit with unit version 3.0 or later is used

when using no-protocol mode.

Unit Versions and Manufacturing Dates/Lot Numbers

Classification Type Model May 2004 June 2003 December 2005

Inner Boards Serial Communica-

CPU Bus Units Serial Communica-

CPU Unit Sup­port Software

tions Boards

tions Units

CX-Programmer WS02-CXPC1-JV@ Ver. 4.0 or earlier Ver. 5.0 Version 6.1

CS1W-SCB21-V1 Pre-Ver. 1.2 Unit version 1.2
CS1W-SCB41-V1

CS1W-SCU21-V1 Pre-Ver. 1.2 Unit version 1.2
CS1W-SCU21-V1
CS1W-SCU41-V1
CS1W-SCU31-V1 --- --- Unit version 1.3
CJ1W-SCU31-V1 --- ---

(Lot No.: 040617
and later)

(Lot No.: 040617
and later)

Unit version 1.3

Unit version 1.3

(Available April,

2006)

xxvii

Functions Added in the Unit Version 1.3 Upgrade 8

8 Functions Added in the Unit Version 1.3 Upgrade

Functions Added in Version Upgrade

The following table provides a comparison between the functions provided in
the upgrade to unit version 1.3 or later of CS1W-SCB@@-V1 Serial Communi­cations Boards and CS1W-SCU@@-V1, CJ1W-SCU@@-V1 Serial Communi­cations Units, and the functionality of earlier versions.

Item Previous unit versions Unit version 1.3 and later

Serial communica­tions mode

Modbus-RTU slave mode Not supported Supported

9 Functions Added in the Unit Version 1.2 Upgrade

Upgraded Models

The model numbers of CS-series Serial Communications Units/Boards have
not changed. A “-V1” suffix has been added to the model numbers of CJ­series Serial Communications Units with the unit version 1.2 upgrade, as
shown in the following table.

PLC Product Specifications Model Model number

CS
Series

CJ
Series

Serial Com­munications
Boards

Serial Com­munications
Units

Serial Com­munications
Units

RS-232C
RS-232C × 1

RS-232C
RS-422A/485

1

RS-232C
RS-232C × 1

RS-232C × 1,
RS-232C × 1

RS-232C
RS-422A/485

1

CS1W-SCB21-V1 → Same

× 1,

CS1W-SCB41-V1 → Same

× 1,

×

CS1W-SCU21-V1 → Same

× 1,

CJ1W-SCU21 → CJ1W-SCU21-V1

CJ1W-SCU41 → CJ1W-SCU41-V1

× 1,

×

after upgrade to

unit version 1.2

xxviii

Functions Added in the Unit Version 1.2 Upgrade 9

Functions Added in Version Upgrade

The following table provides a comparison between the functions provided in
the upgrade to unit version 1.2 or later of CS1W-SCB@@-V1 Serial Communi­cations Boards and CS1W-SCU@@-V1, CJ1W-SCU@@-V1 Serial Communi­cations Units, and the functionality of earlier versions.

Serial com­munications
mode

Item Earlier versions

Serial Gateway Not supported Supported

Host Link 1:1 protocol Not supported (1:N

Host Link
compatible
device selec­tion

No-protocol Not supported Supported, but only when using a CS/CJ-series

(pre-Ver.1.2)

Host Links only)

Not supported (not
completely compati­ble with C-series
Host Link and CVM1/
CV-series Host Link)

The received FINS command can be converted
into serial communications protocol and then con­verted into either of the following protocols (using
the Serial Gateway mode).

• CompoWay/F

•Modbus-RTU

• Modbus-ASCII

• Host Link FINS (This protocol can be used to
make the PLC function as the Host Link Mas­ter.)

The Serial Gateway can also be used in protocol
macro mode. This option enables, for example, pro­gramming or monitoring of a serially connected
PLC from a CX-Programmer that is connected to
the PLC during execution of protocol macros (e.g.,
Host Link Master).

Supported
This protocol functions the same as the 1:1 Host

Link supported by the earlier C200H, C1000H, and
C2000H Series, thereby enabling the use of host
computer programs for 1:1 Host LInks created
using these earlier PLCs.

Note: CS/CJ-series, C200HS/HX/HG/HE(-Z),

@, CQM1@, and CVM1/CV Series all support

CPM
1:N Host Links only. C200H and C500 Host LInk
Units support both 1:1 and 1:N Host Links.

The compatible device mode enables full compati­bility of Host Link functions (see note) with C-series
Host Link and CVM1/CV-series Host Link.

Note: E.g., differences in specifications for delimiter
words in response frame data

CPU Unit with unit version 3.0 or later.
(The no-protocol mode that was previously possi­ble only at the built-in RS-232C port of CPU Unit is
now available for the Serial Communications
Boards and Units.)
This protocol is mainly used for communications
with devices that perform input or output only, such
as bar code readers and printers.

This mode enables no-protocol communications
even if the CPU Unit’s built-in RS-232C port is
being used for another application.

Unit version 1.2 or later

xxix

Functions Added in the Unit Version 1.2 Upgrade 9

Enhanced
protocol
macro func­tions

Standard sys­tem protocol

Item Earlier versions

Link word specification data
exchange timing

Reception buffer processing
for PMCR(260) instruction
execution (immediately
before communications
sequence execution)

Baud rate for protocol macro
mode

Host Link C-mode Command
Master

Host Link FINS Command
Master

(pre-Ver.1.2)

On-request I/O
refreshing only
(request to refresh
sent to CPU Unit at
every send/receive
command execution,
and data exchanged
during I/O refresh)

In this method, after
the send command is
executed, a delay
occurs before the
actual message is
sent.

Clearing to zero only Select to clear or hold the contents of the reception

38,400 bps max.
(57,600 bps not sup­ported)

None (protocols must
be created using CX­Protocol)

Unit version 1.2 or later

Continuous I/O refreshing (selected in DM Area
settings) is supported in addition to the on-request
I/O refreshing available in earlier models.
Continuous I/O refreshing is performed from the
CPU Unit during protocol macro execution, regard­less of requests from the Board/Unit, and data in
the Board/Unit is accessed during send/receive
command execution. When the send command is
executed with this method, the actual message can
be sent immediately.

buffer during full-duplex communications (set in the
allocation DM Area).

This enables the data in the reception buffer
received in the previous communications sequence
to be held after switching the communications
sequence during full-duplex communications.

57,600 bps supported (115,200 bps not supported)

Provided
A Host Link Master can
be used to easily access
the Host Link slave PLC
(e.g., A PLC slave on a
moving body can be
accessed via a WM­series Wireless Modem
in a Host Link.)

Host Link C-mode com­mands can be used to
access a C-series or CS/
CJ-series PLC slave.

Host Link FINS com­mands can be used to
access a CS/CJ-series
or CVM1/CV-series PLC
slave.

This protocol can also
be used to access slave
PLCs on the network.

xxx

Mitsubishi Computer Link
Master (A-compatible, 1C
frame, model 1)

CompoWay/F Master --- Communications sequences with different send

Provided
Computer Link commands can be used to access a

Mitsubishi PLC (Sequencer CPU Module) slave.

and receive protocols are provided by using send/
receive commands with ASCII conversion.

The communications sequences have been
expanded to include CompoWay/F commands
such as VARIABLE AREA READ/WRITE and
OPERATING INSTRUCTIONS.

SECTION 1

Introduction

This section introduces the hardware and software functions of the Serial Communications Boards and the Serial
Communications Units, including the communications modes, system configurations, and specifications.

1-1 Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

1-2-1 Serial Communications Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1-2-2 Serial Communications Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1-3 Protocol Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-3-1 Host Link Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1-3-2 Protocol Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1-3-3 1:N NT Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1-3-4 Loopback Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1-3-5 Serial Gateway Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1-3-6 No-protocol Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1-3-7 Modbus-RTU Slave Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1-4 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1-4-1 Serial Communications Boards and Units . . . . . . . . . . . . . . . . . . . . 12

1-4-2 Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1-5 System Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1-6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

1-6-1 Serial Communications Boards and Unit . . . . . . . . . . . . . . . . . . . . . 23

1-6-2 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

1-6-3 Protocol Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

1-7 Comparison to Previous Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

1-8 Selecting the Serial Communications Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 41

1-9 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1-9-1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

1-9-2 Explanation of Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

1

Using this Manual Section 1-1

1-1 Using this Manual

This manual is structured to provide information on Host Link, protocol macro,
and 1:N NT link communications in functional units, as would be required in
actual applications. You should read Section 1 Introduction first, and then read
information in the rest of the manual and related manuals as required by your
specific application.

Information Section or Manual

Overview and appearance of the Serial Communi­cations Boards and Serial Communications Unit

Overview, features, and specifications of serial
communications

Basic procedures and operations 1-9 Basic Operating Procedure
Selecting serial communications modes 1-8 Selecting the Serial Communications Mode
System configurations for serial communications

modes
Memory Area allocations to the Serial Communica-

tions Boards and Serial Communications Unit

Installing and wiring the Serial Communications
Boards and Serial Communications Unit

Memory Area allocations to individual serial com­munications modes

Communications timing for slave-initiated Host Link
communications

Ladder diagram programming in protocol macros 5-4 Using Protocol Macros
Loopback tests for ports Section 10 Loopback Test
Changing the communications port settings during

operation
Troubleshooting and maintenance Section 11 Troubleshooting and Maintenance
The contents of standard system protocols and

connection methods to OMRON components
Details on Host Link communications (including

ladder diagram programming for slave-initiated
communications)

Details on C-mode commands
Details on FINS commands
Details on the protocol macro function SYSMAC WS02-PSTC1-E

1-2 Overview
2-1 Component Names and Functions
1-3 Protocol Overview
1-4 Features
1-6 Specifications
4-1 Host Link Communications
5-1 Overview of the Protocol Macro Functions
8-1 Overview of 1:N NT Links

1-5 System Configurations

2-2 Data Exchange with the CPU Unit
2-3 I/O Memory Allocations
Section 3 Installation and Wiring

4-2, 5-2, and 8-2 Setup Area Allocations
4-3, 5-3, and 8-3 Auxiliary Area and CIO Area Allo-

cations
4-4 Communications Timing

Appendix R Changing Communications Port
Settings Using STUP(237)

Appendix A to Appendix N

SYSMAC CS/CJ-series
CS1G/H-CPU@@-E, CS1W-SCB21/41,
CS1W-SCU21 Communications Commands
Reference Manual (W342)

CX-Protocol Operation Manual (W344)

2

Overview Section 1-2

1-2 Overview

This section gives an overview of the Serial Communications Boards and the
Serial Communications Unit.

1-2-1 Serial Communications Boards

Serial Communications Boards are Inner Boards for the CS-series PLCs. One
Board can be installed in the Inner Board slot of a CPU Unit. Two serial ports
are provided for connecting host computers, Programmable Terminals (PTs),
general-purpose external devices, and Programming Devices (excluding Pro­gramming Consoles). This makes it possible to easily increase the number of
serial ports for a CS-series PLC.

Serial Communications
Board

Inner Board slot

Models The following two models are available:

CS1W-SCB21-V1
Two RS-232C ports

RS-232C port

RS-232C port

CS1W-SCB41-V1
One RS-232C port + one RS-422A/485 port

RS-232C port

RS-422A/485 port

Connectable Devices The following serial communications modes are supported by the Serial Com-

munications Unit: Host Link (SYSMAC WAY) (see note 1), protocol macro,
1:N NT Link (see note 2), no-protocol (see note 1), Modbus-RTU slave (see
note 3), and loopback test modes. The devices shown in the following diagram
can be connected.

Programming

General-purpose
external device

Programmable
Terminal (PT)

Device (excluding
Programming
Console)

Host computer

Serial Communications Board

CPU Unit

General-purpose
external device

Programmable
Terminal (PT)

Programming
Device (excluding
Programming
Console)

Host computer

3

Overview Section 1-2

Note (1) The Host Link 1:1 and no-protocol modes are supported by unit version

1.2 or later.
(2) Only a 1:N NT Link is supported. A 1:1 NT Link is not supported.
(3) The Modbus-RTU slave mode is supported by unit version 1.3 or later.

A serial communications mode for the Serial Gateway is also provided,
enabling connection with the following devices.

Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible

CompoWay/F­compatible
OMRON
component

device (e.g., Servo)

PLC (Host Link)

FINS message

Serial Communi­cations Board
with unit version

1.2 or later

Protocol
conversion

Protocol
conversion

CPU Unit

FINS message

CompoWay/F­compatible
OMRON
component

Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible
device (e.g., Servo)

1-2-2 Serial Communications Units

The Serial Communications Units are CPU Bus Unit. One or more Units can
be mounted to the CPU Unit or a CS/CJ Expansion Rack. A total of up to 16
CPU Bus Units can be controlled by one CPU Unit. The CS-series Serial
Communications Unit must be used for a CS-series PLC and a CJ-series
Serial Communications Unit must be used for a CJ-series PLC.

Two serial ports are provided for connecting host computers, Programmable
Terminals (PTs), general-purpose external devices, and Programming
Devices (excluding Programming Console). This makes it possible to easily
increase the number of serial ports for the CS/CJ-series PLC.

CS Series

Serial Communications Unit

PLC (Host Link)

4

Overview Section 1-2

t

t

CJ Series

CS1W-SCU21-V1
(Two RS-232C ports)

RS-232C port

RS-232C port

P

A

2

0

5

R

P

O

W

E

R

L1

AC100-240V

INPUT

L2/N

RUN

OUTPUT

AC240V

DC24V

CS1W-SCU31-V1
(Two RS-422A/485 ports)

Serial Communications Unit

SYSMAC

R
U

N

E

R
R

/A
L

M

CJ1G-CPU44

IN

H

P

R

O

G

R

A

M

M

A

B

L
E

P

R
P

H

L

C

O

N
T

R

O

L

L
E

R

C

O

M

M

O

P

E

N

M

C

P

W

R

B

U

S
Y

P

E

R

IP

H

E

R

A

L

P

O

R

T

RS-422A/485 por

RS-422A/485 por

SCU41

RUN

ERC

SD1

RD1

TER1

RDY

ERH

SD2

RD2

TERM
OFF

ON

UNIT

5

4

6

3

7

2

8

1

9

NO.

0

A

F

B

E

C

D

WIRE

2

4

PORT1
(RS422
/485)

PORT2

CJ1W-SCU21-V1
(Two RS-232C ports)

CJ1W-SCU41-V1
(One RS-232C and One RS­422A/485 Port)

RS-232C port

RS-232C port

RS-422A/485 port

RS-232C port

CJ1W-SCU31-V1
(Two RS-422A/485 ports)

RS-422A/485 port

RS-422A/485 port

Connectable Devices The following serial communications modes are supported by the Serial Com-

munications Boards: Host Link (SYSMAC WAY) (see note 1), protocol macro,
1:N NT Link (see note 2), no-protocol (see note 1), Modbus-RTU slave (see
note 3), and loopback test modes. The devices shown in the following diagram
can be connected.

5

Overview Section 1-2

)

Programming

General-purpose
external device

Programmable
Terminal (PT)

Device (excluding
Programming
Console)

Host computer

Serial Communications Unit

CS/CJ-series PLC

General-purpose
external device

Programmable
Terminal (PT)

Programming
Device (excluding
Programming
Console

Host computer

Note (1) The Host Link 1:1 and no-protocol modes are supported by unit version

1.2 or later.
(2) Only a 1:N NT Link is supported. A 1:1 NT Link is not supported.
(3) The Modbus-RTU slave mode is supported by unit version 1.3 or later.

A serial communications mode for the Serial Gateway is also provided,
enabling connection with the following devices.

Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible

CompoWay/F­compatible
OMRON
component

device (e.g., Servo)

PLC (Host Link)

FINS message

Serial Communi­cations Unit with
unit version 1.2 or
later

Protocol
conversion

Protocol
conversion

CPU Unit

FINS message

Functions Added in the
“-V1” Upgrade

6

CompoWay/F­compatible
OMRON
component

Modbus-RTU-compatible
device (e.g., Inverter)
Modbus-ASCII-compatible
device (e.g., Servo)

PLC (Host Link)

The CS1W-SCB21-V1 and CS1W-SCB41-V1 Serial Communications Boards
and CS1W-SCU21-V1 Serial Communications Unit* were upgraded to sup­port the Simple Backup Function in the “-V1” upgrade.

Simple Backup Function

The CPU Unit’s Simple Backup Function can be used to automatically
backup, restore, and compare the Protocol Macro data (both standard system
protocol and user-set protocol data) in the Serial Communications Board or
Unit’s flash memory with the data in the CPU Unit’s Memory Card. The Proto­col Macro data is backed up, restored, or compared along with all of the data
in the CPU Unit. (The Simple Backup Function can be used with CS1-H, CJ1­H, and CJ1M CPU Units only.)

Protocol Overview Section 1-3

Note *The CS-series Serial Communications Boards/Units without the “-V1” suffix

do not support this Simple Backup Function, but the CJ1W-SCU21/41 does
support this function even though the model number lacks the “-V1” suffix.

1-3 Protocol Overview

A Serial Communications Board is an Inner Board for CS-series CPU Units
that provides RS-232C and/or RS-422A/485 serial ports. An Inner Board is an
option and is installed in the CPU Unit.

A Serial Communications Unit is a CPU Bus Unit that provides two RS-232C
serial ports or one RS-232C and one RS-422A/485 port. The following eight
serial communications modes can be used as required for each serial port.

• Host Link: For connections between host computers and PLCs

• Protocol macro: For communications between PLCs and general-purpose
external devices

• 1:N NT Link: For communications between PLCs and Programmable
Terminals (PTs)

• Loopback test: For testing the communications ports

•Serial Gateway

• No-protocol

• 1:1 Host Link

• Modbus-RTU slave mode

Note (1) The Serial Gateway can also be executed in protocol macro mode.

(2) Modbus-ASCII mode is not supported.

PLC

Series

CS Serial

CJ Serial

--- Device to be connected Host computer

Supporting unit versions All unit versions Unit version 1.2 or later Unit version 1.3

Product Model

Communi­cations
Boards

Serial
Communi­cations Unit

Communi­cations Unit

number

CS1W­SCB21-V1

CS1W­SCB41-V1

CS1W­SCU21-V1

CS1W­SCU31-V1

CJ1W­SCU21-V1

CJ1W­SCU31-V1

CJ1W­SCU41-V1

Serial ports Serial communications mode

Host Link Protocol

RS-232C OK OK OK OK OKOKOKOKOK

RS-232C OK OK OK OK OKOKOKOKOK

RS-232C OK OK OK OK OKOKOKOKOK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-232C OK OK OK OK OKOKOKOKOK

RS-232C OK OK OK OK OKOKOKOKOK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-232C OK OK OK OK OKOKOKOKOK

RS-232C OK OK OK OK OKOKOKOKOK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-422A/485 OK (See note 1.) OK OK OK OK OK OK OK OK

RS-232C OK OK OK OK OKOKOKOKOK

or Programming
Device

macro

General­purpose
external
device

1:N NT Link

(See note 2.)

PT None Depends on the

Loop-

back

test

Serial

Serial

Gate-

Gate-

way

way in
proto-

col

macro

mode

protocol used at
the conversion
destination

No-

proto-

col
(See
note

3.)

Gen­eral­pur­pose
exter­nal
device

1:1

Mod-

Host

bus-

Link

RTU

slave

Host Link com­puter

or later

Note 1. A 4-wire connection must be used when using Host Link communications

for an RS-422A/485 connector.

7

Protocol Overview Section 1-3

2. A 1:1 NT Link is not supported.

3. No-protocol mode can be used with CS/CJ-series CPU Units with Unit Ver.

3.0 or later only.

A connection example for each serial communications mode is shown in the
following sections for a Serial Communications Unit. The examples apply
equally as well to the Serial Communications Boards.

1-3-1 Host Link Mode

In Host Link mode, C-mode commands (Host Link commands) or FINS com­mands can be sent from a host computer to read or write I/O memory in the
PLC or to control the PLC’s operating modes. The host computer can be a
personal computer or a Programmable Terminal. The FINS commands are
sent with other data, such a Host Link header and terminator.

In Host Link mode, SEND(090), RECV(098), and CMND(490) instructions can
be used to send FINS commands from PLC to the host computer to read
data, write data, or perform other operations. This is called slave-initiated
communications or unsolicited communications. The FINS commands are
sent with other data, such a Host Link header and terminator.

Note 1. FINS commands can be sent across up to three different networks (count-

ing the local network) to a PLC on a remote network or to a host computer
connected to a PLC on a remote network.

2. Programming Devices can also be connected in Host Link mode.

Sending C-mode Commands

Sending FINS Commands

Host Link

FINS
command

Host Link
header

Host Link
terminator

Host Link

C-mode (Host Link)
command

FINS commands can also be sent to
PLCs on remote networks.

Host Link

FINS
command

Host Link
header

Host Link
terminator

Remote network
(Controller Link or
Ethernet)

FINS command

8

Protocol Overview Section 1-3

Slave-initiated Communications

Host Link

FINS
command

Host Link
terminator

Host Link
header

Slave-initiated FINS commands can also
be sent from PLCs on remote networks.

Host Link

FINS
command

Host Link
header

Host Link
terminator

Remote network
(Controller Link
or Ethernet)

Unit Ver. 1.2 or later supports the 1:1 Host Link protocol for C200H, C1000H,
and C2000H CPU Units, which enables the use of host programs for 1:1 Host
Links created for these PLCs. A Host Link-compatible device selection func­tion is also provided for complete compatibility with the C-series Host Link and
CVM1/CV-series Host Link.

SEND(090),
RECV(098),
CMND(490)

FINS

command

SEND(090): Sends data to host computer
RECV(098): Reads data from host computer
CMND(490): Executes any FINS command

SEND(090),
RECV(098),
CMND(490)

1-3-2 Protocol Macros

Data transfer procedures (protocols) with general-purpose external devices
are created using the CX-Protocol to match the communications specifica­tions (half-duplex or full-duplex, and start-stop synchronization) of the external
device.

These protocols are stored in the Serial Communications Boards or the Serial
Communications Unit, and enable data to be exchanged with general-pur­pose external devices simply by executing the PMCR(260) instruction in the
CPU Unit.

Standard system protocols for exchanging data with OMRON devices (such
as Temperature Controllers, Intelligent Signal Processors, Bar Code Readers,
and Modems) are provided as a standard feature in the Serial Communica­tions Boards, the Serial Communications Unit, and the CX-Protocol. The CX­Protocol can also be used to change the standard system protocols according
to user requirements.

PMCR(260)

Serial Communications Unit

Communications sequence

Protocol

General-purpose external device

9

Protocol Overview Section 1-3

The following additional functions are supported for unit Ver. 1.2 or later.

• Serial Gateway can be executed during protocol macro execution.

• An new I/O refresh method is provided for constant data conversion of
link words.

• The contents of the reception buffer can be held while the PMCR(260)
instruction is executing.

• A baud rate of 57,600 bps is possible (115,200 bps is not possible).

1-3-3 1:N NT Links

A PLC can be connected to one or more Programmable Terminals (PTs)
using an RS-232C or RS-422A/485 port. The I/O memory of the PLC is allo­cated to the Status Control Areas and the Status Notification Areas used by
the PTs, as well as to display objects, such as touch switches, lamps, and
memory tables. This enables the status of the I/O memory in the PLC to be
controlled and monitored by operations from the PTs, without the use of a lad­der diagram programming in the PLC. Up to eight PTs can be connected to a
PLC.

Note The user does not need to be aware of NT Link commands. The user only has

to allocate the PLC memory to the PTs.

Serial Communications Unit

NT Link
(Set to 1:N)

PT

Serial Communications Unit

1:N NT Link

PT

Note 1. The serial port on the PT must be set to a 1:N NT Link.

2. The Serial Communications Boards and Units do not support 1:1 NT Links.
The NT Link must be set to 1:N even if only one PT is connected. Connec­tion is not possible to PTs that do not support 1:N NT Links.

3. The NT20S, NT600S, NT30, NT30C, NT620, NT620C, and NT625C can­not be used if the cycle time of the CPU Unit is 800 ms or longer (even if
only one of these PTs is used in a 1:N NT Link).

4. The Programming Console functions of the PT (Expansion Mode) cannot
be used when connected to Serial Communications Board or Unit ports.
They can be used only by connecting to the peripheral port or RS-232C
port on the CPU Unit.

5. Set a unique unit number for each PT connected to the same PLC. If the
same unit number is set for more than one PT, malfunctions will occur.

6. NT Link serial communications are unique and are not compatible with oth­er serial communications modes.

10

Protocol Overview Section 1-3

1-3-4 Loopback Test

A connector with a loopback connection is attached to the specified serial port
to perform loopback tests. Data is sent to this port, and the communications
circuit is tested by comparing the transmitted data and the data returned by
loopback.

Note This loopback test is performed inside the specified serial port. It is not a loop-

back test using the RS-232C or RS-422A/485 communications path.

Loopback test

1-3-5 Serial Gateway Mode

The received FINS message is automatically converted to either Compo­Way/F, Modbus-RTU, Modbus-ASCII, or Host Link FINS, depending on the
type of message.

CompoWay/F, Modbus-RTU, and Modbus-ASCII

Serial
Communications
Unit

Serial
Gateway

CompoWay (See note.)

CompoWay-compatible
OMRON component,
Modbus-RTU-, or Modbus
ASCII-compatible device

FINS Host Link

FINS

Network

FINS

CompoWay/F (See note.)

Network

FINS

CompoWay/F (See note.)

Note: Or Modbus-RTU

Send FINS

CMND

command

CMND

commands or Modbus
ASCII commands

Send FINS command

Loopback test switch

The loopback test results
are stored.

CX-Programmer or other
Programming Device for
using CX-Server as a
communications driver

1-3-6 No-protocol Mode

No-protocol mode supports data receiving or data sending using data receive
or send commands, respectively (see note). No-protocol mode, however, can
be used only with CS/CJ-series CPU Units with unit Ver. 3.0 or later in which a
Serial Communications Board or Unit with Unit Ver. 1.2 or later is installed.
Use the no-protocol mode when the data send and receive protocols are to be
created by the user, or when connecting to devices that only receive or send
data, such as bar code readers, or printers.

Serial
Gate­way

FINS

FINS

Host Link
header

Host link
terminator

FINS

Host Link
header

PLC (Host Link)

Host link terminator

11

Fe at ur es Section 1-4

Note Serial Communications Boards send/receive data using TXD(236)/RXD(235)

instructions. Serial Communications Units send/receive data using
TXDU(256)/RXDU(255) instructions.

Serial Communications Unit

No-protocol

1-3-7 Modbus-RTU Slave Mode

Modbus-RTU slave mode enables sending Modbus-RTU commands from the
host computer to read and write PLC I/O memory.

Modbus-RTU

Modbus command

1-4 Features

This section describes the features of the Serial Communications Boards, the
Serial Communications Unit, and the protocols.

ST

Tex t

Note: Start code and end code can be specified.

General-purpose external device

Serial Communications Unit

E.g., TXDU

E.g., Execute data transmission

CR+LF

1-4-1 Serial Communications Boards and Units

Serial Communications
Boards (CS Series Only)

Serial Communications
Unit (CS/CJ Series)

A Serial Communications Board is installed as an option in a CPU Unit. Two
serial ports can thus be added without using an I/O slot.

There are two types of Serial Communications Boards: One with two RS­232C ports and one with one RS-232C and one RS-422A/485 port. The RS­422A/485 port can be used for a 1:N connection with general-purpose exter­nal devices without using Link Adapters to support the protocol macro func­tion or NT Link function.

A total of up to 16 CPU Bus Units can be mounted on the CPU Rack or an
Expansion Rack. The total of 16 must include all Serial Communications Units
and all other CPU Bus Units. The PLC can thus be expanded to provide addi­tional serial ports as required by the system.

1-4-2 Protocols

Host Link Communications

Host Link communications are supported by all CS/CJ-series CPU Units.
Serial Communications Boards and Units can be used to connect a single
PLC to more than one host computer for Host Link communications, including
slave-initiated communications. Host Link communications provide the follow­ing features.

Connect One Computer to
Multiple PLCs

An RS-422A/485 port can be used to connect one host computer to up to 32
CS/CJ-series PLCs.

12

Fe at ur es Section 1-4

Computer Monitoring and
Control of PLCs

FINS Commands for
Complete Control

Redundant Error
Checking

Simultaneous Usage of
Both Ports

Slave-initiated
Communications

Send FINS Commands to
Remote Networks

Host Link communications enable the host computer to monitor or control
PLC operations and to read and write I/O memory in the PLCs.

In addition to C-series (Host Link) commands, FINS commands are also sup­ported. FINS commands give you the power to control CS/CJ-series PLC
functionality.

Both vertical and horizontal (FCS) parity checks are performed on communi­cations data to achieve essentially error-free communications. Combining
error checking and retry processing goes one step further to eliminate nearly
all the effects of communications problems.

Each Serial Communications Board and Unit provides two serial ports that
can be used simultaneously to connect to two different host computers. A total
of up to 16 CPU Bus Units, including the Serial Communications Units, can be
mounted to one PLC. If all 16 CPU Bus Units are Serial Communications
Units, then up to 32 ports can be added.

Communications can be performed either by sending a command from a host
computer and having the PLC return a response, or by sending a command
from a PLC and having the computer send a response. Starting communica­tions from a slave is called unsolicited communications, and is made possible
through the SEND(090), RECV(098), and CMND(490) instructions. These
can be used to send FINS commands to a host computer connected locally or
to a host computer connected to a remote network up to three networks away
(counting the local network).

A FINS command contained within a Host Link header and terminator can be
sent using Host Link communications to PLCs connected not only on Host
Link networks, but also other interconnected remote networks up to three net­works away (counting the local network). Various types of networks can exist
between the source of the command and the destination of the command.

Send FINS Commands to
Computers Connected to
Remote PLCs

Host Link

Controller Link Network

Bridge

Controller Link Network

Ethernet Network

Gateway

A FINS command contained within a Host Link header and terminator can be
sent using Host Link communications to a host computer connected to a PLC
on a remote network up to three networks away (counting the local network,
but not counting the final Host Link connection). Various types of networks
can exist between the PLC sending the command and the destination of the
command.

13

Fe at ur es Section 1-4

Host Link

Controller Link Network

Bridge

Controller Link Network

Ethernet Network

Gateway

SEND(090),
RECV(098),
CMND(490)

Protocol Macros

The main features of the protocol macro functions are described below. For
details, refer to the CX-Protocol Operation Manual (W344).

Wide Range of
Communications
Protocols

Send Frames and Receive
Frames Matching
Specifications

Communications-related
Functions

Send/Receive Monitoring Receive wait monitoring, receive completion monitoring, and send completion

Retry Processing Send/receive retry processing can be automatically executed when an error

PLC Read/Write Variables
in Send Frames and
Receive Frames

Switch 1:N
Communications or the
Data Write Destinations
Using Repeat Processing

PLC Interrupts During
Data Reception

Next Process Switching
According to Receive Data

New Error Check Codes LRC2 (two’s complement of LRC), and SUM1 (one’s complement of SUM)

Step Queuing for Sync
Signal from the PLC

Half-duplex or Full-duplex
Transmissions

Communications are possible with virtually any general-purpose external
device, provided it has an RS-232C or RS-422A/485 port, supports half­duplex or full-duplex communications, and supports start-stop synchroniza­tion.

Send frames (command + data and other send frames) and receive frames
(response and other frames) can be created and registered according to the
communications frame specifications of the external device.

Error check code calculations, frame length calculations during sending, and

⇔Hexadecimal conversion of numeric data are supported.

ASCII

monitoring are supported. If monitoring times are exceeded, send/receive can
either be terminated, or retry processing can be performed.

occurs, simply by setting the number of retries.
Variables for reading PLC memory can be included in the actual send frames.

These can be used as destination addresses or data when reading PLC data
while sending. Variables for writing to PLC memory can be also included in
the actual receive frames. These can be used to write the contents of destina­tion addresses or data to the PLC during reception.

Repeat processing (repeat counters) for send/receive processing can be
specified in communications sequences. This enables the same data to be
sent by switching destination addresses during communications 1:N (N = 32
max. due to restrictions in the physical layer) or by switching the PLC memory
write destination addresses during data reception.

An interrupt can be created in the PLC’s CPU Unit during data reception, and
an interrupt program can be executed in the CPU Unit. (The PLC interrupt
function is supported only for the Serial Communications Boards. This func­tion cannot be used with Serial Communications Units.)

The contents of up to 15 set of expected receive data can be compared with
the receive data to determine the next process.

have been added to the error check codes.
At any step of the communications sequence, the next process can be made

to wait until a sync signal from the PLC’s CPU Unit has been input. This
enables processing, such as data manipulations, to be performed in the CPU
Unit during the communications sequence.

With the conventional protocol macro functions, only half-duplex transmis­sions were possible. With half-duplex mode, the reception buffer is cleared

14

Fe at ur es Section 1-4

immediately after the send operation is completed. Therefore, if there was a
rapid response from the remote device, for example, the data received
between data sending and the completion of the send operation could not be
accessed as receive data by the next receive operation.

Support for the full-duplex transmissions enables all the data received in a
sequence to be accessed. Data can also be received from a remote device
while sending.

Note Full-duplex transmissions can be used with either RS-232C or RS-422A/485

as long as 1:1, 4-wire connections are used. Full-duplex transmissions cannot
be used with 1:N connections or 2-wire connections.

Clear Reception Buffer at
Any Time

Control ER Signal at Any
Time

With full-duplex mode, the reception buffer is cleared only immediately before
a communications sequence is executed. When a reception or other fault
occurs, the receive data can be cleared at any time using the reception buffer
clear (FLUSH) command.

With a connection to a modem, the ER signal is used to show the communica­tions enabled status of a Serial Communications Board or Unit (Data Terminal
Equipment (DTE)). In conventional operations, the ER signal could be turned
ON only while a communications sequence was being executed.

Improving this function has enabled the ER signal to be turned ON or OFF at
any time during a communications sequence. This enables modem connec­tions and disconnections to be performed by a protocol macro.

The ER signal can also be kept ON, even after a communications sequence
has been completed. In this case, the ER signal remains ON, even after it has
been switched to a different serial communications mode (for example, Host
Link). This function enables remote programming and monitoring to be per­formed using remote Programming Devices, by switching to the Host Link
mode with the STUP(237) instruction once the connection has been made
with the modem.

15

System Configurations Section 1-5

1-5 System Configurations

This section explains the system configuration supported by each serial com­munications mode.

Host Link Communications

PLC:
Com­puter

1:1
Por t:

RS-232C

Connection to Serial Communications Board.

Connection configuration Required

CS1W-SCB21-V1Port 1 or 2 Host computer

Note 1.

CS1W-SCB41-V1Por t 1

NT-AL001-E
Converting
Link Adapter

Note 3.

Note 2.

NT-AL001-E NT-AL001-E

Note 3.

5-V power
supply

devices

Connected

serial

port/Remarks

Converts
between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

Possible com-

mand flow

to PLC:
C-mode or
FINS
commands

PLC to Host
computer:
FINS
commands only

1:1
Por t:

RS-422A/
485

Resistance ON,
5-V power

Connection to Serial Communications Unit.

Resistance ON

Note 1.

CS1W-SCU21-V1Por t 1 or 2

CJ1W-SCU21-V1Por t 1 or 2

CJ1W-SCU41-V1Por t 2

Note 3.

Note 2.

NT-AL001-E NT-AL001-E

Resistance ON,
5-V power

Resistance ON

Note 3.

NT-AL001-E
Converting
Link Adapter

5-V power
supply

Converts
between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

Connection to Serial Communications Board CS1W-SCB41-V1Port 2 Host computer

Note 3.

NT-AL001-E

Resistance ON,
5-V power

Note 2.

Resistance ON

NT-AL001-E
Converting
Link Adapter

5-V power
supply

RS-232C
RS422A/485

For NT-AL001-E
Link Adapter

Connection to Serial Communications Unit CS1W-SCU31-V1Por t 1 or 2

Note 3.

NT-AL001-E

Resistance ON,
5-V power

Note 2.

Resistance ON

CJ1W-SCU31-V1Por t 1 or 2

CJ1W-SCU41-V1Por t 1

NT-AL001-E
Converting

RS-232C
RS422A/485

⇔

⇔

to PLC
(4-wire only):
C-mode or
FINS
commands

PLC to Host
computer
(4-wire only):
FINS
commands only

Link Adapter
5-V power

supply

For NT-AL001-E
Link Adapter

16

System Configurations Section 1-5

PLC:
Com­puter

1:N
Por t:

RS-232C

1:N
Por t:

RS-422A/
485

Connection configuration Required

devices

Connected

serial

Possible com-

mand flow

port/Remarks

Connection to Serial Communications Board.

Note 3. Note 2.

NT-AL001-E

Resistance ON,
5-V power

Resistance
ON

Connection to Serial Communications Unit.

Note 3. Note 2.

CS1W-SCB21-V1Port 1 or 2 Host computer

to PLC

CS1W-SCB41-V1Por t 1

NT-AL001-E
Converting
Link Adapter

Converts
between
RS-232C and
RS-422A/485

5-V power
supply

For NT-AL001-E
Link Adapter

(RS-422A/485
section: 4-wire):
C-mode or
FINS
commands

PLC to Host
computer:
Commands
cannot be sent.

CS1W-SCU21-V1Por t 1 or 2

CJ1W-SCU21-V1Por t 1 or 2

NT-AL001-E

Resistance ON,
5-V power

Resistance
ON

CJ1W-SCU41-V1Por t 2

NT-AL001-E
Converting
Link Adapter

Converts
between
RS-232C and
RS-422A/485

5-V power
supply

For NT-AL001-E
Link Adapter

Connection to Serial Communications Board CS1W-SCB41-V1Port 2 Host computer

Note 3.

Resistance ON,
5-V power

Note 4.

Note 2.

Resistance ON

NT-AL001-E
Converting
Link Adapter

5-V power
supply

RS-232C
RS422A/485

For NT-AL001-E
Link Adapter

Connection to Serial Communications Unit CS1W-SCU31-V1Por t 1 or 2

Note 3.

CJ1W-SCU31-V1Por t 1 or 2

⇔

to PLC
(4-wire only):
C-mode or
FINS
commands

PLC to Host
computer:
Commands
cannot be sent.

Resistance ON,
5-V power

Note 4.

Note 2.

Resistance ON

CJ1W-SCU41-V1Por t 1

NT-AL001-E
Converting

RS-232C
RS422A/485

Link Adapter
5-V power

supply

For NT-AL001-E
Link Adapter

⇔

17

System Configurations Section 1-5

PLC:
Com­puter

Host
computer
to
Network
PLCs, 1:N

Connection configuration Required

Connection to Serial Communications Board or Serial
Communications Unit

Controller Link or
Ethernet network

Communications can be sent across three different networks (counting the local network, but not including a
Host Link connection). Routing tables must be set in the PLCs.

Host Link

Network 1

Gateway or bridge

devices

Any Serial
Communica­tions Board or
Unit

Communica­tions Unit:
Controller Link
Unit or Ether­net Unit

Connected

serial

port/Remarks

Port 1 or 2 Host computer

or

Network 3

Possible com-

mand flow

to PLC:
FINS
commands only

PLC to Host
computer:
FINS
commands only
(RS-422A/485:
4-wire only)

Network 2

Gateway

Note 1. The maximum cable length for RS-232C is 15 m. The RS-232C standard,

however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.

2. The combined cable length for RS-422A/485 is 500 m including branch
lines.

3. The maximum cable length is limited to 2 m when an NT-AL001-E Link
Adapter is connected.

4. Branch lines must be a maximum of 10 m long.

5. Four-wire connections must be used for RS-422A/485 connections with
Host Link communications.

6. “Resistance ON” indicates that the terminating resistance must be turned
ON.

7. “5-V power” indicates that a 5-V power supply is required for the Link
Adapter. Refer to the Link Adapter manual for details. Be sure that the pow­er supply has sufficient capacity and accuracy and wire it away from high­power lines and another sources of noise. A 5-V power supply is not re­quired for a Link Adapter connected to a Serial Communications Board or
Unit because power is supplied from pin 6 of the connector.

8. The maximum baud rate of the NT-AL001-E Link Adapter is 64 Kbps. Do
not use 115.2 Kbps when a Link Adapter is connected.

18

System Configurations Section 1-5

Protocol Macros, Serial Gateway, No-protocol, or Modbus-RTU Slave

PLC:

External

device

1:1
Por t:

RS-232C

Connection of a Serial Communications Board to a device with an
RS-232C or RS-422A/485 port.

Connection of a Serial Communications Unit to a device with an
RS-232C or RS-422A/485 port.

Connection configuration Required

devices

CS1W-SCB21-V1Por t 1 or 2

Note 1.

RS-232C

CS1W-SCB41-V1Por t 1

NT-AL001-E

RS-232C
interface

Note 2.Note 3.

NT-AL001-E

RS-232C RS-422A/485

Resistance
ON

Note 3.

NT-AL001-E

RS-232C RS-422A/485

Resistance
ON

Note 2.

Resistance
ON

NT-AL001-E
Resistance ON
5-V power

RS-232C
interface

RS-422A/485
interface

Converting Link
Adapter

5-V power
supply

CS1W-SCU21-V1Por t 1 or 2

Note 1.

RS-232C

CJ1W-SCU21-V1Por t 1 or 2

CJ1W-SCU41-V1Por t 2

RS-232C
interface

Note 2.Note 3.

NT-AL001-E
Converting Link
Adapter

NT-AL001-E

RS-232C

Resistance ON

Note 3.

RS-232C RS-422A/485

RS-422A/485

Note 2.

NT-AL001-E

Resistance ON

Resistance
ON

NT-AL001-E
Resistance ON
5-V power

RS-232C
interface

RS-422A/485
interface

5-V power
supply

Connected serial

port/Remarks

Converts between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

Converts between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

19

System Configurations Section 1-5

PLC:

External

device

1:1
Por t: RS-

422A/ 485

Connection configuration Required

Connection of a Serial Communications Unit to a device with an RS­232C or RS-422A/485 port

Note 2.

RS-422A/485 interface

Resistance ON

RS-232C

RS-232C interface

Resistance ON

Resistance ON

RS-422A/485

Note 2. Note 3.

NT-AL001-E

RS-422A/

Resistance ON

485

5-V power

Connection of a Serial Communications Board to a device with an RS­232C or RS-422A/485 port

Note 2.

RS-422A/485 interface

Resistance ON

RS-232C

RS-232C interface

Resistance ON

Resistance ON

RS-422A/485

Note 2. Note 3.

NT-AL001-E

RS-422A/

Resistance ON

485

5-V power

devices

port/Remarks

CS1W-SCU31-V1Por t 1 or 2

CJ1W-SCU31-V1Por t 1 or 2

CJ1W-SCU41-V1Por t 1

Connected serial

NT-AL001-E
Converting Link
Adapter

5-V power
supply

Convert between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

CS1W-SCB41-V1Por t 2

NT-AL001-E
Converting Link
Adapter

5-V power
supply

Convert between
RS-232C and
RS-422A/485

For NT-AL001-E
Link Adapter

20

System Configurations Section 1-5

PLC:

External

device

1:N
Por t: RS-

232C

Connection configuration Required

Connection of a Serial Communications Board to devices with
RS-232C or RS-422A/485 ports

Note 3.

NT-AL001-E

RS-232C RS-422A/485

Resistance ON

Note 3.

RS-232C

Note 3.

NT-AL001-E

RS-232C

NT-AL001-E

Resistance
ON

Resistance
ON

RS-422A/485

B600-AL001

RS-422A/485

Note 2.

NT-AL001-E

Note 2.

Note 2.

RS-422A/485 interface

Note 4.

RS-232C

RS-232C

RS-422A/485 interface

Resistance ON

Resistance ON

RS-232C interface

devices

port/Remarks

CS1W-SCB21-V1Por t 1 or 2

CS1W-SCB41-V1Por t 1

Connected serial

NT-AL001-E
Converting Link
Adapter

B500-AL001
Link Adapter

5-V power
supply

Converts between
RS-232C and
RS-422A/485

For RS-422A/485
branching

For NT-AL001-E
Link Adapter

Resistance ON
5-V power

RS-232C

Note 3.

Connection of a Serial Communications Unit to devices with
RS-232C or RS-422A/485 ports.

Note 3. Note 2.

NT-AL001-E

RS-232C

Resistance ON

Note 3.

NT-AL001-E

RS-232C

Note 3.

RS-232C

Resistance
ON

NT-AL001-E

Resistance
ON

RS-422A/485

RS-422A/485

Note 2.

Note 2.

Resistance ON
5-V power

RS-422A/485

B500-AL001

NT-AL001-E

RS-422A/485 interface

Resistance ON

RS-422A/485 interface

Resistance ON

Note 4.

RS-232C interface

RS-232C

RS-232C

RS-232C

Note 3.

CS1W-SCU21-V1Por t 1 or 2

CJ1W-SCU21-V1Por t 1 or 2

CJ1W-SCU41-V1Por t 2

NT-AL001-E
Converting Link
Adapter

B500-AL001
Link Adapter

5-V power
supply

Converts between
RS-232C and
RS-422A/485

For RS-422A/485
branching

For NT-AL001-E
Link Adapter

21

System Configurations Section 1-5

PLC:

External

device

1:N
Por t: RS-

422A/485

Connection configuration Required

Connection of a Serial Communications Board to devices with RS­232C or RS422A/485 ports

RS-422A/485 interface

Resistance ON

Resistance ON

Resistors ON

RS-422A/485

Note 2.

RS-422A/485

Note 2.

RS-422A/485

B500-AL001

Note 2.

NT-AL001-E

Resistance ON
5-V power

Resistance ON

RS-422A/485 interface

Resistance ON

Note 4.

RS-232C interface

RS-232C

RS-232C

RS-232C

Note 3.

Connection of a Serial Communications Board to devices with RS­232C or RS422A/485 ports

RS-422A/485 interface

devices

port/Remarks

CS1W-SCB41-V1Por t 2

Connected serial

NT-AL001-E
Converting Link
Adapter

B500-AL001
Link Adapter

5-V power
supply

Converts between
RS-232C and
RS-422A/485

For RS-422A/485
branching

For NT-AL001-E
Link Adapter

CS1W-SCU31-V1Por t 1 or 2

CJ1W-SCU31-V1Por t 1 or 2

Resistance ON

Resistance ON

Resistors ON

RS-422A/485

Note 2.

RS-422A/485

Note 2.

RS-422A/485

B500-AL001

Note 2.

NT-AL001-E

Resistance ON
5-V power

Resistance ON

RS-422A/485 interface

Resistance ON

Note 4.

RS-232C interface

RS-232C

RS-232C

RS-232C

Note 3.

CJ1W-SCU41-V1Por t 1

NT-AL001-E
Converting Link
Adapter

B500-AL001
Link Adapter

5-V power
supply

Converts between
RS-232C and
RS-422A/485

For RS-422A/485
branching

For NT-AL001-E
Link Adapter

Note 1. The maximum cable length for RS-232C is 15 m. The RS-232C standard,

however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.

2. The combined cable length for RS-422A/485 is 500 m including branch
lines.

22

Specifications Section 1-6

3. The maximum cable length is limited to 2 m when an NT-AL001-E Link
Adapter is connected.

4. Branch lines must be a maximum of 10 m long.

NT Link Communications NT Link communications are used to connect an OMRON Programmable

Controller (PLC) and Programmable Terminal (PT). Up to 8 PTs can be con­nected to one PLC. For details on the system configuration, refer to the user’s
manual for the PT.

1-6 Specifications

1-6-1 Serial Communications Boards and Unit

CS Series

Device name Serial Communications Boards Serial Communications Unit

Classification Inner Board CPU Bus Unit
Model number CS1W-SCB21-V1 CS1W-SCB41-V1 CS1W-SCU21-V1 CS1W-SCU31-V1
Serial ports Port 1 RS-232C RS-232C RS-232C RS-422A/485

Port 2 RS-232C RS-422A/485 RS-232C RS-422A/485

Protocol Port 1 Host Link, protocol macro, NT Link, or loopback test can be selected for each port.

Port 2

Number of
mountable
Boards/Units

Data exchange
with the CPU
Unit

Supporting CPU Units CS1 CPU Units

Simple Backup Function The CPU Unit’s Simple Backup Function can be used to backup the Protocol Macro

CPU Unit One Board per Inner Board slot None
CPU Rack None A total of up to 16 Units, including all other
Expansion Rack None

Ordinary
refreshing of
software
switches and
status

Transfer from the
CPU Unit set by
the system

Unit Ver. 1.2 or later also supports Serial Gateway, no-protocol, and 1:1 Host Link
modes. (Note: The Serial Gateway can also be executed in protocol macro mode.)

Unit Ver. 1.3 or later also supports Modbus-RTU slave mode.

CPU Bus Units. No restrictions on the
mounting location.

Allocated 25 words of the 100 words in
the Inner Board CIO Area (constant
data exchange with the CPU Unit)

Of the 768 words in the Inner Board DM
Area, each serial port is allocated 10
words (total 20 words).

Data is transferred from the CPU Unit
at the following times:

• Startup or restart

• Ladder instruction: STUP(237)

• Port Settings Changing Flag turns ON

(Auxiliary Area)

High-speed: CS1H-CPU67-V1/CPU66-V1/CPU65-V1/CPU64-V1/CPU63-V1
Standard: CS1G-CPU45-V1/CPU44-V1/CPU43-V1/CPU42-V1

CS1-H CPU Units

High-speed: CS1H-CPU67H/CPU66H/CPU65H/CPU64H/CPU63H
Standard: CS1G-CPU45H/CPU44H/CPU43H/CPU42H

Note A CS1-H CPU Unit with Unit Ver. 3.0 or later is required to use the no-proto-

col mode.

data in the Serial Communications Board/Unit to the CPU Unit’s Memory Card. The
backed-up data can be restored or compared.

(The Simple Backup Function can be used with CS1-H CPU Units only.)

Allocated 25 words of the 25 words in the
CPU Bus Unit CIO Area (constant data
exchange with the CPU Unit)

Of the CPU Bus Unit DM Area, each
serial port is allocated 10 words (total 20
words).

Data is transferred from the CPU Unit at
the following times:

• Startup or restart

• Ladder instruction: STUP(237)

• Port Settings Changing Flag turns ON

(Auxiliary Area)

23

Specifications Section 1-6

Device name Serial Communications Boards Serial Communications Unit

Applicable Backplanes None CPU Backplanes:

CS1W­BC103/BC083/BC053/BC033/BC023

CS Expansion Backplanes:

CS1W-BI103/BI083/BI053/BI033

Current consumption (See note.) 280 mA + x 360 mA + x 290 mA + x 400 mA
Weight 100 g max. 110 g max. 200 g max. 250 g max.

Note The current consumption is for one Serial Communications Board or Unit.

When an NT-AL001-E Link Adapter is connected to the Serial Communica­tions Board or Unit, power is supplied to the Link Adapter from the Board or
Unit. A current consumption of 150 mA must be added for each Link Adapter
that is connected. In the above specifications, “x” indicates that 150 mA must
be added for each port to which an NT-AL001-E Link Adapter is connected to
provide the required 5-V power supply.

24

Specifications Section 1-6

CJ Series

Device name Serial Communications Unit

Classification CPU Bus Unit
Model number CJ1W-SCU21-V1 CJ1W-SCU31-V1 CJ1W-SCU41-V1
Serial ports Port 1 RS-232C RS-422A/485 RS-422A/485

Port 2 RS-232C RS-422A/485 RS-232C

Protocol Port 1 Host Link, protocol macro, NT Link, or loopback test can be selected for

Port 2

Number of mount­able Units

Data exchange
with the CPU Unit

Supporting CPU Units CJ1 CPU Units

Simple Backup Function The CPU Unit’s Simple Backup Function can be used to backup the Pro-

Current consumption (See note.) 280 mA + x 380 mA 380 mA + x
Weight 110 g max. 110 g max. 110 g max.

CPU Unit None
CPU Rack A total of up to 16 Units, including all other CPU Bus Units. No restrictions
Expansion Rack
Ordinary

refreshing of software
switches and status

Transfer from the CPU
Unit set by the system

each port.
Unit Ver. 1.2 or later also supports Serial Gateway, no-protocol, and 1:1

Host Link modes. (Note: The Serial Gateway can also be executed in pro­tocol macro mode.)

Unit Ver. 1.3 or later also supports Modbus-RTU slave mode.

on the mounting location.

Allocated 25 words of the 25 words in the CPU Bus Unit CIO Area (con­stant data exchange with the CPU Unit)

Of the CPU Bus Unit DM Area, each serial port is allocated 10 words
(total 20 words).

Data is transferred from the CPU Unit at the following times:

• Startup or restart

• Ladder instruction: STUP(237)

• Port Settings Changing Flag turns ON (Auxiliary Area)

CJ1G-CPU45/CPU44

CS1-H CPU Units

High-speed: CJ1H-CPU67H/CPU66H/CPU65H
Standard: CJ1G-CPU45H/CPU44H/CPU43H/CPU42H

CJ1M CPU Units

CJ1M-CPU23/CPU22/CPU21/CPU13/CPU12/CPU11

Note A CS1-H CPU Unit with Unit Ver. 3.0 or later is required to use the

no-protocol mode.

tocol Macro data in the Serial Communications Board/Unit to the CPU
Unit’s Memory Card. The backed-up data can be restored or compared.

(The Simple Backup Function can be used with CJ1-H and CJ1M CPU
Units only.)

Note The current consumption is for one Serial Communications Unit. When an NT-

AL001-E Link Adapter is connected to the Serial Communications Board or
Unit, power is supplied to the Link Adapter from the Board or Unit. A current
consumption of 150 mA must be added for each Link Adapter that is con­nected. In the above specifications, “x” indicates that 150 mA must be added
for each port to which an NT-AL001-E Link Adapter is connected to provide
the required 5-V power supply.

1-6-2 General Specifications

The general specifications of the CS-series Serial Communications Boards
and Serial Communications Unit conform to the general specifications of the
CS-series CPU Unit.

The general specifications of the CJ-series Serial Communications Unit con­form to the general specifications of the CJ-series CPU Unit.

25

Specifications Section 1-6

1-6-3 Protocol Specifications

Host Link Specifications

Item Description

Communications mode Half-duplex (Full-duplex for slave-initiated communications)
Synchronous mode Start-stop synchronization (asynchronous mode)
Baud rate (see note 1) RS-232C port and RS-422A/485 ports:

Communications
distance (see note 1)

Connection
configuration

Number of connected
Units

Frame structure C-mode

Error check codes Vertical parity: Even, odd. or none

Command flow and
support

1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps
Default setting: 9,600 bps
RS-232C port: 15 m max. (see note 2)
RS-442A/485 port: 500 m max. (The total combined cable length is 500 m max. T-branch lines

must be a maximum of 10 m long.)
RS-232C port: 1:1 (1:N (N = 32 Units max.) is possible using an Converting Link Adapters.)
RS-422A/485 port: 1:N (N = 32 Units max.)
32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)

commands
FINS

commands

FCS (horizontal parity converted to ASCII)

Command flow Commands Contents

Host computer
to PLC

PLC to host
computer

Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
code + text, error check code: FCS, terminator: *+CR

Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
code (always “FA”) + FINS header + FINS command + text, error check
code: FCS, terminator: *+CR

C-mode commands 1:1 or 1:N communications with directly connected

FINS commands (in
Host Link protocol)

FINS commands (in
Host Link protocol)

PLCs (The specified frame format must be prepared
on the host computer and then sent.)

1:1 or 1:N communications with directly connected
PLCs.

Communications using SEND(090), RECV(098),
and CMND(490) from CPU Unit.

The host computer must interpret the commands
and return a response in the correct format.

Connection between the host computer and PLC
must be 1:1.

26

Note 1. Confirm the baud rates and communications distance supported by con-

nected devices.

2. The maximum cable length for RS-232C is 15 m. The RS-232C standard,
however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.

Specifications Section 1-6

Protocol Macro Function Specifications

Item Description

Number of protocols 20 max. Can be created and registered with the Protocol Support Tool

Number of sequences 1,000 max.

Per protocol Number of

sequences

Number of mes­sages

Number of recep­tion matrixes

Sequence execution condition Using the CPU Unit’s PMCR(260) instruction (specifying the sequence

Communications mode Half-duplex or full-duplex
Synchronous mode Start-stop synchronization (asynchronous mode)
Baud rate (see note 1) RS-232C port and RS-422A/485 ports:

Communications distance (see note 1) RS-232C port: 15 m max.

Connection configuration RS-232C port: 1:1 (1:N (N = 32 Units max.) is possible using a Convert-

Number of connected Units 32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connec-

Maximum number of
data exchange words
between PLC and
protocol macro
function

Operand setting 250 words Including the word that specifies the number of

Link word setting 500 words O1, O2, I1, and I2: 500 words total
Direct setting 500 words Maximum number of words per data attribute

(CX-Protocol).

60 max.

300 max.

100 max.

number)

1,200/2,400/4,800/9,600/19,200/38,400 bps
Default setting: 9,600 bps

Note A baud rate of 57,600 bps can be selected when using Unit Ver.

1.2 or later (115,200 bps is not possible).

RS-442A/485 port: 500 m max. (The total combined cable length is
500 m max. T-branch lines must be a maximum of 10 m long.)

ing Link Adapter.)
RS-422A/485 port: 1:N (N = 32 Units max.)

tion)

words (1 word)

27

Specifications Section 1-6

Item Description

Sequence contents
(step common
parameters)

Number of steps
per sequence

Transmission con­trol parameters

Response notifica­tion method (oper­and)

Monitoring time
during
send/receive
processing

Link word setting Area in which data is exchanged between the CPU Unit and the Serial

16 max.

X-on/X-off flow, RS/CS flow, delimiter control, or contention control, and
modem control can be selected.

Scan notification or interrupt notification (i.e., writing the receive data in
the I/O memory area specified in the 4th operand of the PMCR(260)
instruction) can be selected.

Scan notification:
Writes the receive data to I/O memory during CPU Unit scanning.

Interrupt notification:
Writes the receive data to I/O memory as soon as it is received, and at
the same time specifies the execution of the interrupt program for the
CPU Unit.

Note The interrupt notification method can be executed only by a

Serial Communications Board. It cannot be used for a Serial

Communications Unit.
Scan method (fixed) Board and Unit
Interrupt notification Board only (see note 2)
Interrupt notification

for reception case
number

Receive wait, receive completion, or send completion can be monitored.
Setting range: 0.01 to 0.99 s, 0.1 to 9.9 s, 1 to 99 s, or 1 to 99 minutes

Communications Board or Unit during Communications Board or Unit
refreshing. Two areas are possible for each device: An area for storing
receive data and an area for storing send data.

Note Unit Ver. 1.2 or later supports continuous I/O refreshing in addition

to the previous on-request I/O refreshing.

Board only (see note 2)

28

Specifications Section 1-6

Item Description

Step contents Commands Send only (SEND), receive only (RECV), send and receive

Repeat counter 1 to 255 times
Retry count 0 to 9

Send wait time 0.01 to 0.99 s, 0.1 to 9.9 s, 1 to 99 s, or 1 to 99 minutes

With or without
response write
(operand)

Next processing When a step has ended normally, End (sequence completed), Next (pro-

Error processing When a step has ended abnormally, End, Next, Goto, or Abort can be

Send message Data sent to the

Receive message Data sent from the

Reception matrix When the command

(SEND&RECV), wait (WAIT), reception buffer clear (FLUSH), ER-ON
(OPEN), or ER-OFF (CLOSE)

(Only when the command is SEND&RECV)

(Only when the command is SEND or SEND&RECV)
When receive processing is completed (when the receive data is stored

in the area specified in the 4th operand of the PMCR(260) instruction),
whether or not to store the received messages can be selected.

ceed to the next step No.), Goto (go to the specified step No.), or Abort
(interrupt the step and terminate that sequence) can be selected.

selected.

specified address
when the command
is SEND or
SEND&RECV.

specified address
when the command
is RECV or
SEND&RECV.

is RECV or
SEND&RECV, sets
the expected
receive messages
(15 max.), and
switches to the next
processing accord­ing to the message
received.

Consists of a header (*1), address (*2), length,
data (*2), error check code (*3), and terminator
(*1).

For an explanation of *1, *2, and *3, see the next
page.

Specifies the receive messages and the next pro­cessing for each of cases No. 00 to No. 15. Of the
maximum 16 cases, one case must be set as
“Other” in the receive messages (in addition to the
set receive messages).

Note 1. The baud rate and the communications distance sometimes depend on the

remote device.

2. A macro syntax error will occur if the interrupt notification method is exe­cuted for a Serial Communications Unit.

3. When using 2-wire RS-422A/485 communications in Protocol Macro
Mode, set only modem controls for the send control parameters, and do
not use RS/CS flow controls.

29

Specifications Section 1-6

Item Description

Message unit
contents

*1:
Header and
terminator
data attributes

*2:
Data
attributes of
addresses
and data in
send/receive
messages

Con­stant

Con­stant

Var i ­able

ASCII data, hexadecimal data, or control code

ASCII data, hexadecimal data, or control code (with an address, no control
code is possible)

No conversion, conversion to ASCII data, or conversion to hexadecimal data
(the read/write direction can be specified)

Designa­tion
method

X Word designa-

(X, Y)
X: Effective address (where read from, or where written to)

Y: Data size (1 to 1,000)
Note The data size is the number of bytes on the transmission

path.

Word read (I/O

tion

Wild card * Any data or address can be

Repeat counter N

memory to
send data)

Word wr ite
(receive data to
I/O memory)

Specify using
the 3rd oper­and of the
PMCR(260)
instruction.

Specify using a
link word.

I/O memory
direct designa­tion

Specify using
the 4th oper­and of the
PMCR(260)
instruction.

Specify using a
link word.

I/O memory
direct designa­tion

received (only in receive mes­sages)

Set leading
address + n
(The linear
expression aN
+ b, including
repeat counter
N, is also pos­sible for n.)

30

Specifications Section 1-6

Item Description

Message unit
contents

Trace function A total of up to 1,700 bytes (characters) of time-series data can be traced in

*2:
Data
attributes of
addresses
and data in
send/receive
messages

*3:
Error check codes

Maximum length of
send/receive mes­sages

Maximum number of
data attributes regis­tered in one message

Maximum number of
write data attributes
registered in one mes­sage

Var i ­ables

Y Linear expres-

sion including
repeat counter

Wild card * Can be received regardless of

Word designa­tion

LRC, LRC2, CRC-CCITT, CRC-16, SUM, SUM1, and SUM2 can be calcu­lated.

1,000 bytes. (A maximum length between 200 and 1,000 bytes can be set in
the Setup Area.)

96 attributes (see note 1)

30 attributes (see note 2)

send and receive messages.
Changes to the step No. and control signals such as RS and CS can also be

traced.

aN + b a: 0 to 1000; b: 1 to 1000

N: Repeat counter value

the length (only in receive mes­sages)

Word read (I/O
memory to
send data)

Specify using
the 3rd oper­and of the
PMCR(260)
instruction.

Specify using a
link word.

I/O memory
direct designa­tion

Set leading
address + n
(The linear
expression aN
+ b, including
repeat counter
N, is also pos­sible for n.)

Note 1. The CX-Protocol can be used to register up to 96 attributes per message.

2. A macro syntax error will occur when the protocol macro is executed if

Serial Gateway Specifications

Conversion source FINS commands (received through network (including Host

Conversion functions • The received FINS command sent to the Board/Unit’s serial

more than 31 write attributes are registered in one message.

Item Description

Link FINS) or CPU bus)

port is converted according to the FINS command code as
follows:
2803 hex: FIN header removed and converted to Compo­Way/F command.
2804 hex: FIN header removed and converted to Modbus­RTU command.
2805 hex: FIN header removed and converted to Modbus­ASCII command.
The converted command is sent to the serial port.

• When the received FINS command is sent to the Board or
Unit (user-specified FINS command code), the FINS com­mand is enclosed in a Host Link header and terminator.

31

Specifications Section 1-6

Item Description

Converted format • CompoWay/F commands

• Modbus-RTU commands

• Modbus-ASCII commands

• Host Link FINS commands

Enabled serial com­munications mode

Queuing functions Up to five FINS commands can be converted and then queued

Protocol macro exe­cution processing

Response timeout
monitoring

Send start timeout
monitoring

Send delay The time can be set from when the message is converted into

Serial Gateway mode or protocol macro mode

for processing.
When a FINS command is received during protocol macro

execution, the Serial Gateway is executed using an interrupt
between steps in the communications sequence. If the next
step is a RECEIVE command, the Serial Gateway will not be
executed until the next step. For other conditions, the interrupt
is executed immediately.

Note The reception buffer is cleared during Serial Gateway

execution.

Note The Serial Gateway can be prohibited in protocol macro

mode by turning ON the Serial Gateway Prohibit Switch
in the CIO Area.

The time is monitored from when the message is converted
into the specified protocol using the Serial Gateway until the
response is received (in Serial Gateway mode or protocol
macro mode).

Default: 5 s (setting range: 0.1 to 25.5 s)

Note When a timeout occurs, the FINS end code (0205 hex:

Response timeout) is returned to the source of the FINS
command and a response is received after a timeout
occurs.

The time is monitored from when the FINS command is
received until it is converted into the specified protocol and
starts to be sent (in protocol macro mode only).

Default: 5 s (setting range: 0.1 to 25.5 s)

Note When a timeout occurs, the FINS end code (0204 hex:

Remote node busy) is returned to the source of the
FINS command. The send processing will not be exe­cuted and the received FINS command will be dis­carded.

another protocol using Serial Gateway conversion until the
data is actually sent. (Serial Gateway or protocol macro mode)

Default: 0 s (setting range: 0.01 to 300.00 s)

32

Specifications Section 1-6

No-protocol Specifications

Item Description

Communications
mode

Baud rate RS-232C port and RS-422A/485 ports:

Messages (commu­nications frame
structure)

Sending messages • Serial Communications Board: TXD(236) instruction

Receiving messages • Serial Communications Board: RXD(235) instruction

Maximum message
length

Data conversion No conversion
Communications

protocol
Message delay time When the TXD(236) or TXDU(256) instruction is executed,

Receive counter The number of data bytes (0 to 256) received at the port can

Reception buffer
clear timing

Full-duplex

1,200/2,400/4,800/9,600/19,200/38,400/57,600 bps
Default setting: 9,600 bps
Set either of the following types in the Setup Area in the allo-

cation DM Area.

1. Data only (without start code and end code)

2. Start code + data

3. Data + end code

4. Start code + data + end code

5. Data + CR + LF

6. Start code + data +CR + LF

Set in allocated DM Area
(The start code can be included by setting it to between 00
and FF hex, and the end code can be included by setting it to
between 00 and FF hex. To exclude the end code, set the
number of receive data bytes.)

Start code None or 00 to FF hex
End code None, 00 to FF hex, or CR + LF
Number of receive

data bytes during
reception

• Serial Communications Unit: TXDU(256) instruction

• Serial Communications Unit: RXDU(255) instruction

Sending and receiving: Up to 259 bytes including the start
code and end code (up to 256 bytes excluding start/end
codes)

None

after the send delay time, the data is sent from the port.
0 to 300 s (0 to 300,000 ms)

(Can be set in 10-ms units depending on the DM Area set­tings)

be counted.
The reception buffer is cleared immediately after executing the

RXD(235)/RXDU(255) instruction

Set the number of receive data bytes
between 1 and 256 bytes (according to
the DM Area settings) when frame struc­ture 1 or 2 above is used.

33

Specifications Section 1-6

Modbus-RTU Specifications

Item Description

Mode Modbus-RTU slave mode (See note.)
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps

Default: 19,200 bps
Data length 8 bits
Parity Odd, even, or none

Stop bits Odd or even parity:1 bit

Address setting
range

Frame format Slave address: 1 byte

Note Modbus-ASCII mode is not supported.

Supported Commands

Function code

(hexadecimal)

01 Reads multiple bits from the CIO, Work,

02 Reads multiple bits from the CIO Area of

03 Reads multiple words from the DM or EM

04 Reads multiple words from the CIO,

05 Writes a bit in I/O memory. Write Single Coil
06 Writes a word in the DM or EM Area of

08 Executes an echoback test. Diagnostic
0F Writes multiple bits in I/O memory. Write Multiple Coils
10 Writes multiple words in the DM or EM

Default: Even

No parity: 2 bits

1 to 247 (broadcasting: 0)

Function code: 1 byte

Data: 0 to 252 bytes

CRC code: 2 bytes

Function Modbus name

Read Coils

Holding, or Auxiliary Area of I/O memory.

Read Discrete Inputs

I/O memory.

Read Holding Registers

Area of I/O memory.

Read Input Registers
Work, Holding, or Auxiliary Area of I/O
memory.

Write Single Register
I/O memory.

Write Multiple Registers
Area of I/O memory.

34

Comparison to Previous Products Section 1-7

1-7 Comparison to Previous Products

The following tables show a comparison between the CS/CJ-series Serial
Communications Boards and Unit and the C200HX/HG/HE Communications
Boards and Host Link Units.

Item C200HX/HG/HE CS CJ

Model Boards C200HW-

Units C200H-LK101-PV1/LK201-

Communica­tions ports

Number mount­able per PLC

Boards 2 RS-232C ports

Units 1 RS-232C port

Boards 1 Board 1 Board NA
Units 2 Units (CPU Rack or

COM02/COM03/COM04­E/COM05-E/COM06-E
Communications Boards

V1 Host Link Unit

or
1 RS-232C and 1

RS422A/485 port
or
1 CPU bus I/F and 1 RS-

232C port
or
1 RS-232C port
or
1 RS-422A/485 port

or
1 RS-422A port
or
1 optical fiber port

Expansion I/O Rack, but not
two slots next to CPU Unit)

Up to 4 ports maximum, 6
ports including those on
CPU Unit.

CS1W-SCB21-V1/SCB41­V1
Serial Communications
Board

CS1W-SCU21-V1/SCU31­V1
Serial Communications Unit

2 RS-232C ports
or
1 RS-232C and 1

RS422A/485 port

2 RS-232C ports
or
2 RS-422A/485 ports

16 Units (CPU Rack or CS
Expansion Rack, but total of
all CPU Bus Units must be
16 or less)

Up to 32 ports maximum, 34
ports including those on CPU
Unit.

None

CJ1W-SCU21-V1
CJ1W-SCU31-V1
CJ1W-SCU41-V1
Serial Communications Unit

NA

2 RS-232C ports,
1 RS-232C and 1
RS422A/485 port,
or 2 RS-422A/485 ports

16 Units (CPU Rack or CJ
Expansion Rack, but total of
all CPU Bus Units must be
16 or less)

Up to 32 ports maximum, 34
ports including those on CPU
Unit.

35

Comparison to Previous Products Section 1-7

Item C200HX/HG/HE CS CJ

Serial
com­muni­cations
modes

Boards Host Link

communica­tions

Protocol
macros

NT Link
communica­tions

No-protocol
communica­tions

1:1 Links Supported. Not supported (supported by Controller Link Units or PLC

Loopback
tests

Serial Gate­way

Modbus­RTU slave

Units Host Link

communica­tions

Protocol
macros

NT Link
communica­tions

No-protocol
communica­tions

1:1 Links Not supported. Not supported (supported by Controller Link Units or PLC

Loopback
tests

Serial Gate­way

Modbus­RTU slave

Supported. (See note 1.) Supported. (1:1 Host Link communications can be selected

Supported (except
COM02/COM03)

Supported. Supported (unified with 1:N NT Links).

Supported. Pre-Ver. 1.2: Not supported.

Not supported. Supported.

Not supported. Pre-Ver. 1.2: Not supported.

Not supported. Pre-Ver. 1.2: Not supported.

Supported. Supported. (1:1 Host Link communications can be selected

Not supported. Supported.

Not supported. Supported (unified with 1:N NT Links).

Not supported. Pre-Ver. 1.2: Not supported.

Not supported. Supported.

Not supported. Pre-Ver. 1.2: Not supported.

Not supported. Pre-Ver. 1.2: Not supported.

when using Unit Ver. 1.2 or later, which enables reuse of
host programs created using the C200H, C1000H, or
C2000H Series.)
A compatible device selection function has also been
added. (See note 1.) This enables Host Link functionality
that is fully compatible with C-series Host Links and
CVM1/CV-series Host Links.

Supported.

Unit Ver. 1.2 or later: Supported.

Link Units).

Unit Ver. 1.2 or later: Supported.

Unit Ver. 1.2: Not supported.
Unit Ver. 1.3 or later: Supported.

when using Unit Ver. 1.2 or later, which enables reuse of
host programs created using the C200H, C1000H, or
C2000H Series.)
A compatible device selection function has also been
added. (See note 1.) This enables Host Link functionality
that is fully compatible with C-series Host Links and
CVM1/CV-series Host Links.

Unit Ver. 1.2 or later: Supported.

Link Units).

Unit Ver. 1.2 or later: Supported.

Unit Ver. 1.2: Not supported.
Unit Ver. 1.3 or later: Supported.

36

Comparison to Previous Products Section 1-7

Item C200HX/HG/HE CS CJ

Baud rate Host Link

communica­tions

Protocol
macros

NT Link
(1:N mode)

No-protocol
communica­tions

Serial Gate­way

Host Link com­munications

Sup­ported
com­mands

Slave-initi­ated com­munications

Modbus­RTU slave

19,200 bps max. 115,200 bps max.

19,200 bps max. 38,400 bps max. (57,600 bps max. for Unit Ver. 1.2 or later)

Standard NT Link Standard NT Link, high-speed NT Link (See note 2.)

19,200 bps max. 57,600 bps max.

Not supported. 115,200 bps max.

C-

Supported. Supported.

mode
(Host
Link)
com­mands

FINS

Not supported. Supported.

com­mands

Boards: Data can be sent
with TXD(236) instruction.

Boards and Units: FINS commands can be sent using

SEND(090), RECV(098), and CMND(490).
Units: Not supported.
Not supported. Pre-Ver. 1.2: Not supported.

Unit Ver. 1.2: Not supported.

Unit Ver. 1.3 or later: 115,200 bps max.

Note 1. For pre-Ver. 1.2 Units, the number of words that can be read and written

per frame (i.e., the text lengths) when using C-mode commands is different
for C-series Host Link Units and CS/CJ-series Serial Communications
Boards or Serial Communications Units. A host computer program previ­ously used for C-series Host Link Units may not function correctly if it is
used in CS/CJ-series PLCs. When using Serial Communications
Boards/Units with Unit Ver. 1.2 or later, these programs can be reused by
setting the Host Link compatible device mode to mode C (C500/120) or
mode D (D200H). (Alternatively, check the host computer program before
using it and make any corrections required to handle different frame text
lengths. Refer to the CS/CJ-series Communications Commands Refer-
ence Manual (W342) for details.)

2. For CS-series PLCs, a high-speed NT Link is available only with Serial
Communications Boards/Units manufactured on or after December 20,

1999. With earlier models, only the standard NT Link is available.

Lot No: 20Z9

NT31/631(C)-V2 are the only PTs for which high-speed NT link is supported.

Manufactured on December 20th, 1999

The year is indicated with the last digit. In this case, "9" indicates "1999."

Month of manufacture. October, November, and December are indicated
with X, Y, and Z respectively. In this case, the month is "December."

Day of manufacture. In this example, the day is "20."

The following tables shows the improvements made in the protocol macro
function.

37

Comparison to Previous Products Section 1-7

Protocol Macro Comparison

Item C200HX/HG/HE CS/CJ

Transmission mode Half-duplex Half or full-duplex
Commands Send only: SEND, receive only:

Reception buffer (per port) 256 bytes 2.5 Kbytes
Reception buffer flow con-

trol at Board/Unit (RS/CS
or Xon/Xoff)

Send/receive message
length

Reception message
length when using wild­card (*) for data length

Send/
receive
data stor­age loca­tions and
data capac­ity

Operand
specification

Link word
specification

Direct speci­fication (vari­able)

Start (CTS signal OFF to
request canceling send
from remote device)

Clear (CTS signal ON to
request restarting send
from remote device)

Bytes per send 256 bytes max. 1,000 bytes max.
Bytes per

receive

For RS/CS flow, Xon/Xoff
flow, or delimiter control

Other 256 bytes max.

Maximum send data size 127 words max. (not including

Maximum receive data
size

Area 1 IN 128 words max. total 500 words max. total

Area 2 IN

Max. send or receive
data size

For RS/CS
flow,
Xon/Xoff
flow, or
delimiter
control

Other 256 bytes max.

OUT

OUT

RECV, or send and receive:
SEND and RECEIVE

200 bytes 2 Kbytes

At step transition 0.5 Kbytes

200 bytes max.

200 bytes max. As set above.

word specifying the number of
send words)

127 words max. (not including
word specifying the number of
receive words)

128 words max. (no conversion) 500 words max. (no conversion)

Send only: SEND, receive only:
RECV, send and receive: SEND
and RECEIVE, wait: WAIT, clear
reception buffer: FLUSH,
ER-ON: OPEN, and ER-OFF:
CLOSE

WAIT: Progressing to next
process controlled by signal
from CPU Unit.

FLUSH: Clears contents of
reception buffer.

OPEN: Used for modem control.
Keeps ER signal ON even after
end of sequence.

CLOSE: Used for modem
control. Turns OFF ER signal.

Default: 200 bytes. Setting
range: 200 to 1,000 bytes.

Reception data is removed from
the reception buffer in incre­ments of the size set here.

Default: 200 bytes
Setting range: 200 to 1,000
bytes.

250 words max. (including word
specifying the number of send
words)

250 words max. (including word
specifying the number of
receive words)

(Unit Ver. 1.2 or later supports a
continuous I/O refreshing
(selected in DM Area settings)
in addition to the on-request I/O
refreshing available in earlier
models).)

38

Comparison to Previous Products Section 1-7

Item C200HX/HG/HE CS/CJ

Reception buffer clearing
timing

Reception buffer recep­tion processing

Character trace reception
records

Transmission control
signal operations

Synchronization with CPU Unit after start of sequence
execution

Half-duplex Before executing sequences.

Before executing RECV
processing.

Full-duplex None Before executing sequences.

Half-duplex Only during RECV processing. Except when executing SEND

Full-duplex None During sequence execution

Half-duplex Recorded except during SEND

processing.
Full-duplex None
RTS signal RTS/CTS flow control: RTS sig-

nal turned ON when reception

buffer reaches 200 bytes.

Modem control: RTS signal

turned ON when data is sent

and turned OFF when send is

completed.

CTS signal RTS/CTS flow control: Data

send is on standby when CTS

signal turns ON; data can be

sent when CTS signal turns

OFF.
ER signal Modem control: ON when

sequence execution is started,

OFF when completed.

Turns ON only for modem con-

trols.

During RTS/CTS flow control and modem control, the ER signal

will be controlled according to modem control operations, the RTS

signal will turn ON when sending, and the RTS/CTS flow control

operations will be used for the RTS and CTS signals for

receptions.

None The WAIT command can be

Before executing sequences.
After executing SEND

processing.
Upon FLUSH command

execution.

Upon FLUSH command
execution.

(Unit Ver. 1.2 or later: Either
clear or hold before executing
sequences.)

processing.

(reception processing not
performed except during
sequence execution).

During sequence execution
(even during SEND processing)

RTS/CTS flow control: RTS sig­nal turned ON when reception
buffer reaches approximately
2Kbytes.

Modem control: RTS signal
turned ON when data is sent
and turned OFF when send is
completed.

RTS/CTS flow control: Data
send is on standby when CTS
signal turns ON; data can be
sent when CTS signal turns
OFF.

Modem control: ON when
sequence execution is started,
OFF when completed. Also can
be turned ON or OFF as
required during modem control
by executing OPEN to turn ON
the ER signal or by executing
CLOSE to turn OFF the ER sig­nal in sequence steps. The ER
signal can also be controlled
across multiple steps.

used to stop transitions between
steps to allow transitions from
the CPU Unit.

This is useful, for example, to
perform processing in the CPU
Unit after a specific step but
before executing the next step.

39

Comparison to Previous Products Section 1-7

Item C200HX/HG/HE CS/CJ

Send/receive messages Reception length No check. The length of data set in the

Error check codes No LRC2 or SUM1 checks. LRC2 and SUM1 supported.

Interrupt notification function Supported. Boards: Supported.

Simple Backup Function None The CPU Unit’s Simple Backup

expected reception message
will be fetched from the recep­tion buffer as the message.

Units: Not supported.

Function can be used to backup
the Protocol Macro data in the
Serial Communications
Board/Unit to the CPU Unit’s
Memory Card. The backed-up
data can be restored or com­pared.

(When a CS1-H CPU Unit is
being used, this function is sup­ported by the CS1W-SCB21­V1, CS1W-SCB41-V1, CS1W­SCU21-V1, and CS1W-SCU31­V1. When a CJ1-H CPU Unit is
being used, this function is sup­ported by the CJ1W-SCU21(­V1), CJ1W-SCU31-V1 and
CJ1W-SCU41(-V1).)

40

Selecting the Serial Communications Mode Section 1-8

1-8 Selecting the Serial Communications Mode

Connect Device

• Host computer Communicating

• OMRON

component

• OMRON
component

• Modbus-com­patible device
(including
OMRON
components)

using an OMRON
protocol

Creating
communications
frame for a host
computer protocol

Standard system
protocol

User-created
protocol

CompoWay/
F-compatible

Modbus-RTU­compatible

Serial Communications Mode

Host Link

Protocol macro

Modbus-RTU
Slave

Protocol macro

Protocol macro

Execute using PMCR instruction.
Execute using CMND instruction.

Through network

Execute using CMND instruction.

Through network

Host computer (Host computer:PLC

Command
interpretation
by PLC

PLC

Command sent
to host computer

Use a standard
system protocol.

Use the CX-Protocol to
change a standard
system protocol.

= 1:1 or 1:N)
C-mode commands
or FINS commands

(Host computer:PLC
= 1:1) FINS
commands

Modbus-RTU
commands
sent from host

Reference

• Communications
Commands Reference
Manual (W342)

• Section 4 Using Host
Link Communications

• Section 5 Using
Protocol Macros

• CX-Protocol Operation
Manual (W344)

Section 9 Using Modbus­RTU Slave Mode
(Unit Version 1.3 or later)

• Section 5 Using
Protocol Macros

• Appendices B to O

• Section 5 Using

Protocol Macros

• CX-Protocol Operation
Manual (W344)

Serial Gateway
Serial Gateway

Serial Gateway

Serial Gateway

• Modbus-com­patible device
(including
OMRON
components)

• OMRON PLC

• Reusing host

computer
programs for
existing PLC

• General­purpose
external device

• General-

purpose
external device

Modbus-ASCII­compatible

CS/CJ Series or
CVM1/CV Series

• Reusing host computer programs for 1:1 Host Link
created using C200H/C1000H/C2000H PLCs

• Reusing host computer programs for Host Link created

using CVM1-series PLCs

Protocol (including
no-protocol) used
mainly for stop-start
synchronous data
sending and reception

Sending/receiving
data in a single
direction from/to a
device such as a bar
code reader or printer

User-created protocol
using ladder program

Execute using CMND instruction.

Through network

Execute using CMND/SEND/RECV
instruction.

Protocol macro

No-protocol

Use the CX-Protocol to
create a new protocol.

Serial Gateway

Serial Gateway

Serial GatewayThrough network

1:1 Host Link
Used with Host Link compatible

device selection function (Select
C mode or D mode)

Host Link compatible device
selection function (Select B mode)

• Section 5 Using
Protocol Macros

• CX-Protocol Operation
Manual (W344)

41

Basic Operating Procedure Section 1-9

• Programming
Device (but not a

Programming
Console)

• OMRON
Programmable

Terminal (PT)

Remote
programming and
monitoring via a
modem

High-speed
communications
for multiple PTs
(up to eight).

Low-speed
communications
and only one PT

Host Link

Note When a Programming Device is connected

to the PLC, the Peripheral Bus can be used
by connecting to the ports on the CPU Unit.
This is faster than using Host Link commu­nications.

1:N NT Link

Note The PT must also be set for a 1:N NT Link.

Communications will not be possible if the
PT is set for a 1:1 NT Link.

Host Link

1-9 Basic Operating Procedure

1-9-1 Overview

An overview of the basic operating procedure is provided here. Refer to the
following pages for details.

1,2,3... 1. Turn OFF the power supply to the PLC.

2. Set the unit number if a Serial Communications Unit is being used.
Set the unit number using the rotary switch on the front panel of the Unit.

3. Install the Board or Unit.

4. Connect the Unit and the external device(s).

5. Turn ON the power supply to the PLC

6. Create the I/O tables if a Serial Communications Unit is being used.
Create the I/O tables using a Programming Device, such as a Program-

ming Console.
I/O tables must be created when a Serial Communications Unit (CPU Bus

Unit) is used with a CS/CJ-series PLC. (This aspect of operation is different
from using Communications Boards with the C200HX/HG/HE, C200H, or
C200HS.)

7. Set the Setup Area allocated in the DM Area.
Make settings using a Programming Device, such as a Programming Con-

sole, or the CX-Protocol.
The following words are allocated as the Setup Area in the DM Area:

Board:20 words beginning at D32000
Unit: 20 of the 100 words starting from (D30000 + 100

Make the following settings:

• Serial communications mode (Host Link, protocol macro, NT Link,
loopback test, Serial Gateway, or no-protocol)

• Baud rate

• Transmission mode for protocol macros (half-duplex or full-duplex), the
maximum length of send/receive data, etc.

8. Make the new settings in the Setup Area valid by performing one of the fol­lowing.

• Turn the power OFF and then ON again.

• Section 4 Using Host
Link Communications

• Communications
Commands Reference
Manual (W342)

• Section 8 Using 1:N
NT Links

• Section 4 Using Host
Link Communications

× unit number)

42

Basic Operating Procedure Section 1-9

F

E

D

C

B

A

9

8

7

6

5

4

3

2

1

0

• Restart the Board by turning ON the Inner Board Restart Bit (A60800)
or restart the Unit turning ON one of the CPU Bus Unit Restart Bits
(A50100 to A50115, where the bit number corresponds to the unit
number).

• Restart the port on the Serial Communications Board by turning ON
one of the Communications Board Port Settings Change Bits (A63601
for port 1 and A63602 for port 2) or restart the port on the Serial Com­munications Unit by tuning ON one of the Communications Unit Port
Settings Change Bits (A620 to A635: The word will be A620 + unit
number and the bit will be bit 01 for port 1 and bit 02 for port 2).

• Execute the STUP(237) instruction. The STUP(237) instruction is ex­ecuted in the ladder program to change the serial communications
mode of a serial port. See Appendix O Changing Port Settings Using

STUP(237).

9. Execute communications.
Use the software switches or the allocated flags and words allocated in the

CIO Area in the ladder program to control communications.
The following words are allocated in the CIO Area:

Board: 25 words from CIO1900
Unit: 25 words from CIO 1500 + 25

× unit number

1-9-2 Explanation of Procedure

Turning OFF the Power Check that the PLC power has been turned OFF. If the power is ON, turn it

OFF.

Setting the Unit Number
for Serial
Communications Units

When a Serial Communications Unit is used, set the unit number switch at the
top of the front panel of the Unit to between 0 and F. The number that is set
will determine which words are allocated as the Setup Area in the DM Area
and which words are allocated in the CIO Area.

CS-series Units

SCU21-V1

RUN
ERC

SD1

RD1

UNIT
No.

RDY
ERH
SD2
RD2

Unit number switch

CJ-series Units

SCU41

RUN

ERC

RD1

SD1

SD2

RD2

ERH

RDY

TERM

OFF

WIRE

2ON4

5

4

3

2

1

0

F

E

D

TER1

UNIT

6

7

Unit number switch

8

9

A

NO.

B

C

43

Basic Operating Procedure Section 1-9

First word in Setup Area allocated in DM Area:
m = D30000 + 100 × unit number
(20 words are used beginning from m,
10 words for each port)

Unit No. Words Unit No. Words

Unit No. 0 D30000 to D30099 Unit No. 0 CIO 1500 to CIO 1524
Unit No. 1 D30100 to D30199 Unit No. 1 CIO 1525 to CIO 1549
Unit No. 2 D30200 to D30299 Unit No. 2 CIO 1550 to CIO 1574
Unit No. 3 D30300 to D30399 Unit No. 3 CIO 1575 to CIO 1599
Unit No. 4 D30400 to D30499 Unit No. 4 CIO 1600 to CIO 1624
Unit No. 5 D30500 to D30599 Unit No. 5 CIO 1625 to CIO 1649
Unit No. 6 D30600 to D30699 Unit No. 6 CIO 1650 to CIO 1674
Unit No. 7 D30700 to D30799 Unit No. 7 CIO 1675 to CIO 1699
Unit No. 8 D30800 to D30899 Unit No. 8 CIO 1700 to CIO 1724
Unit No. 9 D30900 to D30999 Unit No. 9 CIO 1725 to CIO 1749
Unit No. A D31000 to D31099 Unit No. A CIO 1750 to CIO 1774
Unit No. B D31100 to D31199 Unit No. B CIO 1775 to CIO 1799
Unit No. C D31200 to D31299 Unit No. C CIO 1800 to CIO 1824
Unit No. D D31300 to D31399 Unit No. D CIO 1825 to CIO 1849
Unit No. E D31400 to D31499 Unit No. E CIO 1850 to CIO 1874
Unit No. F D31500 to D31599 Unit No. F CIO 1875 to CIO 1899

First word allocated in the CIO Area:
n = CIO 1500 + 25 × unit number
(all words are used beginning with n)

Setup Area in the DM Area:
D32000 to D32767

D32000 to D32009 Port 1 Setup Area CIO 1900 Software switch
D32010 to D32019 Port 2 Setup Area CIO 1901 to CIO 1904 Board status
D32020 to D32767 Reserved for the system CIO 1905 to CIO 1914 Port 1 status

Installing the Board or
Unit

1,2,3... 1. Press in the lever on the Inner Board installation cover, first on the top and

With a Serial Communications Board, the following words are always allo­cated.

Words allocated in the CIO Area:
CIO 1900 to CIO 1999

CIO 1915 to CIO 1924 Port 2 status
CIO 1925 to CIO 1999 Reserved for the system

Serial Communications Board (CS Series Only)

then on the bottom, and remove the cover.

44

Press in the lever on the top. Press in the lever on the bottom.

Basic Operating Procedure Section 1-9

2. Install the Serial Communications Board.

CS-series Serial Communications Unit

1,2,3... 1. Catch the hook on the top of the back of the Unit on the Backplane, and

then rotate the Unit downward to mount it.

Hook

Phillips
screwdriver

Backplane

2. Insert the Unit firmly into the Backplane connector.

3. Tighten the screw at the bottom of the Unit with a Phillips screwdriver to a
torque of 0.4 N

•m. For this operation, the Phillips screwdriver must be

placed at a slight angle. Therefore, leave sufficient space at the bottom of
the Unit.

Duct

CPU Unit

I/O Power
Supply Unit

Remote I/O
Unit

Duct

At least 20 mm

Backplane

At least 20 mm

45

Basic Operating Procedure Section 1-9

CJ-series Serial Communications Unit

1,2,3... 1. Align the connectors properly and then press in on the Unit to connect it.

Connector

P

A

2

0

5

R

POWER

L1

A

C

1

0

0

-2

4

0

V

IN

P

U

T

L2/N

R

U

N

O

U

T

P

U

T

A

C

2

4

0

V

D

C

2

4

V

2. Slide the sliders on the top and bottom of the Unit until they lock the Units

P

A

2

0

5

R

POWER

L1

A

C

1

0

0

-2

4

0

V

IN

P

U

T

L2/N

S

Y

S

C

J

1

P

R

O

G

C

O

N
T

together.

S

Y

S

M

A

C

C

J

1

G

-

C

P

U

4

4

P

R

O

G

R

A

M

M

A

B

L

E

C
O

N

T

R

O

L

L

E

R

OPEN

M

C

P

W

R

B

U

S

Y

RUN

M

A

C

ERR/ALM

G

-

C

P

U

4

4

INH

R

A

M

M

A

B

L

E

PRPHL

R

O

L

L

E

R

COMM

OPEN

M

C

P

W

R

B

U

S

Y

PERIPHERAL

P

O

R

T

SCU41

TERM

WIRE

RUN

ERC

SD1

RD1

TER1

RDY

ERH

SD2

RD2

OFF

ON

UNIT

5

4

6

3

7

2

8

1

9

NO.

0

A

F

B

E

C

D

2

4

PORT1
(RS422
/485)

PORT2

Slider

RUN

ERR/ALM

INH

PRPHL

COMM

SCU41

TERM

OFF

WIRE

RUN

ERC

SD1

RD1

TER1

RDY

ERH

SD2

RD2

ON

UNIT

5

4

6

3

7

2

8

1

9

NO.

0

A

F

B

E

C

D

2

4

PORT1
(RS422
/485)

Release

Lock

PERIPHERAL

R

U

N

O

U

T

P

U

T

A

C

2

4

0

V

D

C

2

4

V

P

O

R

T

PORT2

Note If the sliders are not locked properly, the Serial Communications Units may

not function correctly.

Connections Connect the external devices using RS-232C or RS-422A cables. For details

on the connector pin layout and the connection methods, see Section 3 Instal-
lation and Wiring, and refer to the relevant manuals for the external devices to
be connected.

Types of Port for Different Models

The types of port for the different models of Serial Communication Boards
and Units are shown in the following table.

PLC Series Type of Unit Model Port 1 Port 2

CS Series Serial Communica-

tions Board

Serial Communica­tions Unit

CJ Series CJ1W-SCU21-V1RS-232C RS-232C

CS1W­SCB21-V1

CS1W­SCB41-V1

CS1W­SCU21-V1

CS1W­SCU31-V1

RS-232C RS-232C

RS-232C RS-422A/485

RS-232C RS-232C

RS-422A/485 RS-422A/485

46

CJ1W-SCU31-V1RS-422A/485 RS-422A/485

CJ1W-SCU41-V1RS-422A/485 RS-232C

Basic Operating Procedure Section 1-9

When an RS-422A/485 port is used, the following setting is required.

• TERM: Terminating resistance ON/OFF switch
OFF: Terminating resistance OFF
ON: Terminating resistance ON

• WIRE: 2-wire or 4-wire selector switch
2: 2-wire; 4: 4-wire

OFF

2

ON
4

TERM
WIRE

Connection Example for Host Link Communications

The host computer can be connected to a PLC 1:1, or NT-AL001-E Convert­ing Link Adapters can be used to convert from RS-232C to RS-422A/485 to
connect the host computer to PLCs 1:N.

Serial Commu­nications Board

NT-AL001-E
Terminating resis­tance ON, 5-V power
supply required

Terminating resistance
ON

Serial Commu­nications Unit

Also perform other required processing, such as setting switches on the exter­nal device(s).

Connection Example for Protocol Macros, Serial Gateway, No-protocol
Mode, and Modbus-RTU Slave

Serial Communications
Board

Terminating
resistance ON

RS-232C

RS-422A/485

Terminating
resistance ON

General-purpose
external device

Also perform other required processing, such as setting switches on the exter­nal device(s).

Connection Example for 1:N NT Links

Refer to the manual for the PT.

Connecting Programming Devices

Connect the Programming Console, CX-Programmer, or CX-Protocol to the
CPU Unit as required.

Turning ON Power Turn ON the PLC power supply to the PLC.

General-purpose
external device

General-purpose
external device

General-purpose
external device

47

Basic Operating Procedure Section 1-9

Creating I/O Tables for
Serial Communications
Units

Setting the Setup Area in
the DM Area

I/O tables must be created for Serial Communications Units. Create the I/O
table using a Programming Device, such as a Programming Console or CX­Programmer.

Set the serial communications mode and the communications specifications
for the Board or Unit. Use a Programming Device, such as a Programming
Console or CX-Programmer, or the CX-Protocol to set the Setup Area.

Host Link Communications

The following table shows the default (standard) settings for Host Link com­munications.

m = D30000 + 100

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m+10 15 0 Start bit: 1 bit

D32001 D32011 m+1 m+11 00 to 03 0 The baud rate setting is disabled when the

D32002 D32012 m+2 m+12 15 0 Send delay: 0 ms
D32003 D32013 m+3 m+13 15 0 CTS control: No

Unit

(CS/CJ Series)

Bit Setting Meaning

Data length: 7 bits
Parity: Even
Stop bits: 2 bits
Baud rate: 9,600 bps

08 to 11 5 Host Link mode

default settings are used.

00 to 07 00 Host Link unit number: 0

× unit number

1:1 Host Link Mode

Example: When using a Serial Communications Board/Unit with Unit Ver. 1.2
or later, host computer programs that were created using the earlier models
C500-LK101, C500-LK201, C500-LK103, or C500-LK203 can be executed
using 1:1 Host Link protocol.

m = D30000 + 100

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32003 D32013 m+3 m+13 14 1 1:N/1:1 Host Link setting: 1:1 Host Link
D32003 D32013 m+3 m+13 10-08 3 hex Host Link compatible device mode: C mode

Unit

(CS/CJ Series)

Bit Setting Meaning

(C500/120)

× unit number

Protocol Macros

The following table shows the default (standard) settings for protocol macros.

m = D30000 + 100 × unit number

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m + 10 15 0 Start bit: 1 bit

D32001 D32011 m + 1 m + 11 03 to 00 0 9,600 bps when the default settings are

Unit

(CS/CJ Series)

Bit Setting Meaning

Data length: 7 bits
Parity: Even
Stop bits: 2 bits
Baud rate: 9,600 bps

11 to 08 6 Protocol Macro mode

used.

48

Basic Operating Procedure Section 1-9

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32008 D32018 m + 8 m + 18 15 0 Half-duplex
D32009 D32019 m + 9 m + 19 15 to 00 00C8 hex Maximum number of bytes in protocol

Unit

(CS/CJ Series)

Bit Setting Meaning

macro send/receive data: 200 bytes

NT Link Mode

The following table shows the default (standard) settings for NT link when the
maximum PT unit number is 5.

m = D30000 + 100

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m + 10 11 to 08 2 1:N NT Link
D32001 D32011 m + 1 m + 11 03 to 00 0 The baud rate is set to the standard NT link

D32006 D32016 m + 6 m + 16 02 to 00 5 1:N NT Link maximum unit number

Unit

(CS/CJ Series)

Bit Setting Meaning

setting when the default settings are used.

(example)

× unit number

Serial Gateway

Using Serial Gateway Alone

1. Make the settings in the Setup Area.
m = D30000 + 100

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m+10 15 0 Start bits: 1 bit

D32002 D32012 m+2 m+12 15 0 Send delay: 0 ms
D32003 D32013 m+3 m+13 15 0 CTS control: No
D32007 D32017 m+7 m+17 15 to 08 00 hex Response timeout monitoring time: 5 s

Unit

(CS/CJ Series)

Bit Setting Meaning

Data length: 7 bits
Parity: Even
Stop bits: 2
Baud rate: 9,600 bps

11 to 08 9 hex Serial communications mode: Serial Gate-

way

× unit number

2. Set the local network table in the routing tables as required (using CX-Net).

Using Serial Gateway During Protocol Macro Execution

1. Make the settings in the Setup Area.
m = D30000 + 100

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m+10 11 to 08 6 hex Serial communications mode: Protocol

D32002 D32012 m+2 m+12 15 0 Send delay: 0 ms
D32003 D32013 m+3 m+13 15 0 CTS control: No
D32007 D32017 m+7 m+17 15 to 08 00 hex Response timeout monitoring time: 5 s

Unit

(CS/CJ Series)

Bit Setting Meaning

macro

07 to 00 00 hex Serial Gateway send start timeout monitor-

ing time: 5 s

× unit number

49

Basic Operating Procedure Section 1-9

2. Set the allocated Software Switches.

n = 1500 + 25

Board

(CS Series only)

1900 n 12 Port 2 Serial Gateway Prohibit Switch (protocol mac-

Unit

(CS/CJ Series)

Bit Function

ros)
0: Serial Gateway not prohibited
1: Serial Gateway prohibited

04 Port 1 Serial Gateway Prohibit Switch (protocol mac-

ros)
0: Serial Gateway not prohibited
1: Serial Gateway prohibited

The enable/disable status for the Serial Gateway is automatically indicated
by the following flag.

× unit number

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

1909 1919 n+9 n+19 08 Serial Gateway Prohibited Flag

Unit

(CS/CJ Series)

Bit Meaning

1: Serial Gateway prohibited
1: Serial Gateway not prohibited

3. Set the local network table in the routing tables as required (using CX-Net).

No-protocol Mode

The following example is for the default (standard) communications condi­tions, with the send delay set to 100 ms, start code included (e.g., @), end
code included (CR + LF), and number of receive bytes set to 100 bytes.

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m+10 15 0 Start bits: 1 bit

D32001 D32011 m+1 m+11 03 to 00 0 hex The baud rate is 9,600 bps when the default

D32002 D32012 m+2 m+12 15 1 Send delay: User-specified

D32003 D32013 m+3 m+13 15 1 CTS control 1: Yes
D32004 D32014 m+4 m+14 15 to 08 40 hex Start code: @ (40 hex)
D32005 D32015 m+5 m+15 12 1 Start code: Yes

Unit

(CS/CJ Series)

Bit Setting Meaning

Data length: 7 bits
Parity: Even
Stop bits: 2 bits
Baud rate: 9,600 bps

11 to 08 3 hex No-protocol

settings are used.

11 to 00 00 hex Send delay setting range: 10 decimal (000A

hex), Unit: 10 ms

09 to 08 10 End code: CR + LF
07 to 00 64 hex Number of receive data bytes: 100 bytes

50

Basic Operating Procedure Section 1-9

Modbus-RTU Slave Mode

The following example is for the default (standard) communications condi­tions, with the Modbus slave address set to 1 and the default allocation areas
for Coils, Input Registers, and Holding Registers.

m = D30000 + 100

× unit number

Board

(CS Series only)

Port 1 Port 2 Port 1 Port 2

D32000 D32010 m m+10 15 0 Defaults

D32001 D32011 m+1 m+11 03 to 00 0 hex Disabled for default communications condi-

D32006 D32016 m+6 m+16 15 to 08 1 hex Modbus slave address: 1
D32020 D32030 m+20 m+30 07 to 00 0 hex Coils allocation area: CIO Area
D32021 D32031 m+21 m+31 15 to 08 0 hex Input Registers allocation area: CIO Area

Unit

(CS/CJ Series)

Bit Setting Meaning

Parity: Even
Stop bits: 1 bit
Baud rate: 19,200 bps
(Start bits: 1 bit, Data length: 8 bits)

11 to 08 A hex Modbus-RTU slave

tions (baud rate: 19,200 bps)

07 to 00 0 hex Holding Registers allocation area: DM Area

Validate the New Settings Make the new settings in the Setup Area valid by performing one of the follow-

ing.

• Turn the power OFF and then ON again. The Setup Area allocated in the
DM Area will be read when the power is turned ON.

• Restart the Board by turning ON the Inner Board Restart Bit (A60800) or
restart the Unit turning ON one of the CPU Bus Unit Restart Bits (A50100
to A50115, where the bit number corresponds to the unit number). (See
following table.)

• Restart the port on the Serial Communications Board by turning ON one
of the Communications Board Port Settings Change Bits (A63601 for port
1 and A63602 for port 2) or restart the port on the Serial Communications
Unit by tuning ON one of the Communications Unit Port Settings Change
Bits (A620 to A635: The word will be A620 + unit number and the bit will
be bit 01 for port 1 and bit 02 for port 2).

51

Basic Operating Procedure Section 1-9

Inner Board Restart Bit and CPU
Bus Unit Restart Bits

Board A60800 Unit number Port 1 Port 2

Units A50100 (Unit No. 0) Board A63601 A63602

A50101 (Unit No. 1) Units Unit No. 0 A62001 A62002

A50102 (Unit No. 2) Unit No. 1 A62101 A62102

A50103 (Unit No. 3) Unit No. 2 A62201 A62202

A50104 (Unit No. 4) Unit No. 3 A62301 A62302

A50105 (Unit No. 5) Unit No. 4 A62401 A62402

A50106 (Unit No. 6) Unit No. 5 A62501 A62502

A50107 (Unit No. 7) Unit No. 6 A62601 A62602

A50108 (Unit No. 8) Unit No. 7 A62701 A62702

A50109 (Unit No. 9) Unit No. 8 A62801 A62802

A50110 (Unit No. A) Unit No. 9 A62901 A62902

A50111 (Unit No. B) Unit No. A A63001 A63002

A50112 (Unit No. C) Unit No. B A63101 A63102

A50113 (Unit No. D) Unit No. C A63201 A63202

A50114 (Unit No. E) Unit No. D A63301 A63302

A50115 (Unit No. F) Unit No. E A63401 A63402

Communications Board/Unit Port Settings
Change Bits

Unit No. F A63501 A63502

Executing
Communications

• Execute the STUP(237) instruction. The Board or Unit Setup Area can be
changed while the PLC power supply is ON. The STUP(237) instruction
can be used, for example, when a communications sequence for a
modem connection is executed in Protocol Macro Mode to switch the
operating mode to Host Link Mode when a certain condition is estab­lished. This enables monitoring or programming of the CPU Unit to be
carried out from a host computer. See Appendix O Changing Port Set-

tings Using STUP(237).

The required data and ladder program are created to perform communica­tions in the serial communications mode that has been set.

Host Link Communications

Sending C-mode and FINS Commands from Host Computers to PLCs

To send C-mode commands or FINS commands, programs must be created
on the host computer to send commands to PLCs and to receive responses
back from the PLCs. Refer to the CS/CJ-series Communications Commands
Reference Manual (W342) for details.

Programming to
send commands and
receive responses.

Host computer

Serial Communications Board/Unit

Command

52

Sending FINS Commands from PLCs to Host Computers

SEND(090), RECV(098), and CMND(490) can be used to execute slave-initi­ated communications. Also, programming is required at the host computer to

Basic Operating Procedure Section 1-9

received data and return responses. An example is provided below for
SEND(090).

Programming to
return responses.

SEND(090) can be used to send data from the PLC to a host computer. If the
input condition turns ON when the Communications Port Enabled Flag is ON,
10 words of data from CIO 0100 to CIO 0109 will be sent to the host computer
connected to port 1 on the Serial Communications Unit with network address
0, node address 0, and unit address 10 Hex.

Communications Port

Input condition A20200

Enabled Flag for Port 0

The control data for the above instruction is shown in the following table.

D00200 000A Number of send words: 10
D00201 0100 Bits 00 to 07: Destination network address 0

D00202 0010 Bits 00 to 07: Destination unit address 10 Hex

D00203 0000 Bits 00 to 04: Number of retries is 0

D00204 0000 Response monitoring time: 2 s (default value for 0000)

Host computer

Command

@SEND (90)

D00200

Serial Communications
Board/Unit

CPU Unit

0100

First send word: CIO 0100
"0000" used to send to a host computer.

0000

First control data word: D00200

Word Contents Meaning

Bits 08 to 10: Serial Communications Unit port 1

Bits 08 to 15: Destination node address 0

Bits 08 to 11: Communications port 0
Bit 15: Response required

SEND(090),
RECV(098),
CMND(490)

A program would be required at the host computer to receive the above data
and return a response.

Protocol Macros

When a standard system protocol (provided in the Serial Communications
Board, Serial Communications Unit, and CX-Protocol) is executed.

Using Standard System Protocols

Board or Unit

1,2,3... 1. Setting the Send Data

Uses standard system protocol No. 600

Executed
with
PMCR(260)
(237)

CPU Unit

External device
Example: K3N Series

Digital Panel Meter

53

Basic Operating Procedure Section 1-9

Refer to information on the 3rd operand of PMCR(260) in Appendix B
CompoWay/F Master Protocol and set the number of send data words in

S, and set the send data starting in S+1.

2. Coding PMCR(260)
Example:

The following example shows how to use a Serial Communications Board
to read the present value for a K3N-series Digital Panel Meter using the
CompoWay/F Master standard system protocol sequence No. 600:
Send/receive with ASCII conversion and response.

Protocol Macro

Input condition 191915 A20207

Executing Flag

Communications Port
Enabled Flag for Port 7

If the input condition turns ON when the Protocol Macro Executing Flag
(CIO 191915 for Port 2) is OFF and the Communications Port Enabled
Flag (A20207: Internal logic port, communications port 7) is ON, commu­nications sequence No. 600 of the standard system protocol in the Serial
Communications Board is called, and data is sent and received via port 2
of the Serial Communications Board.

Send Data

ER

PMCR(260) (260)

C1
C2

S

D

FAL (006) 01

#72E1

#0258

D00000

D00010

Communications port 7 and serial port 2
Destination unit address E1: Serial Communications Board

Sequence No. 600
First word of send data

First storage word for receive data

S:D00000

D00001
D00002
D00003
D00004
D00005
D00006

0007
0000

0101
000C
C000
0000
0001

7 words from D00000 to D00006
K3N node No. : 00

CompoWay/F command "0101" (reads the K3N present value)
Number of send bytes

CompoWay/F command send data
(Variable type, read start address, 00, number of elements)

Receive Data

D00011

0004

D00012
D00013

4 words from D00010 to D00013D:D00010
Response code is stored.

The read data (in this case, the present value of K3N) is stored.

3. Executing the PMCR(260) Instruction

4. For details on confirming operation, see Section 12 Tracing and I/O Mem-
ory Monitoring in the CX-Protocol Operation Manual (W344).

• Transmission Line Tracing
The data in the send/receive messages flowing over the transmission
line (RS-232C or RS-422A/485) and the control codes are traced.

• I/O Memory Monitoring
Monitors send/receive data and the status of the various flags.

54

Basic Operating Procedure Section 1-9

Executing User-created Protocols

CX-Protocol

Use the CX-Protocol to create
protocols.

Board or Unit

CPU Unit

Section references in the following procedure refer to the CX-Protocol Opera-
tion Manual (W344).

1,2,3... 1. For details on designing protocols, see Section 4 and Section 5.

a. Create a communications sequence status transition chart.
b. From the status transition chart, divide the processing contents into

sequence steps.

c. Determine the communications sequence message contents.

2. Use the CX-Protocol to create and send a project (protocol data).
See 1-10 for the outline flow.

a. Creating a new project:

See 5-1 Creating a New Project or Protocol.

b. Creating a new communications sequence:

See 5-2 Creating a New Sequence or 7.1 Setting a Sequence.

c. Creating steps:

See 5-2 Creating a New Sequence and 8.1 Setting a Step.

d. Creating messages:

See 9-1 Setting a Message.

Note After creating messages, steps can also be created by specifying

message names.

e. Transferring the created project to a Board or Unit:

See 11-1 Transferring and Reading Protocol Data between Personal
Computers and Serial Communications Boards.

3. Create the ladder program.
a. Setting Send Data

• Specifying Operands
Set the send data in the I/O memory after the S+1 operand of the PM­CR(260) instruction. Set the number of send data words (including S
itself) in S.

• Direct Designations
Set the send data in the I/O memory specified by the read variables in
the send message.

• Specifying Link Words
Set the send data in the O1 or O2 area of the Link Word Area.

b. Coding PMCR(260)
Example for a Serial Communications Board

PMCR(260)

External device

55

Basic Operating Procedure Section 1-9

Protocol Macro

Input condition 191915 A20207

Executing Flag

Communications Port
Enabled Flag for Port 7

ER

C1
C2

S
D

PMCR(260)

#72E1

#0064

D00000

D00010

FAL (006) 01

Communications port 7 and serial port 2
Destination unit address E1: Serial Communications Board

Sequence No. 100
First word of send data

First storage word for receive data

If the input condition turns ON when the Protocol Macro Executing Flag
(CIO 191915 for port 2) is OFF and the Communications Port Enabled
Flag (A20207 for internal logic port, communications port 7) is ON, com­munications sequence No. 100 registered in the Serial Communications
Board is called, and data is sent and received via port 2 of the Serial Com­munications Board.

The amount of send data depends on the number of words specified in
D00000 (the number of words after D00001 plus 1 for D00000 itself), and
is sent from the next word after D00001.

S:D00000

D00001

Number of words

Send data

Number of send words plus 1 for D00000

Number of words

The receive data is stored in consecutive words beginning with D00011,
and the number of words actually stored in D00010 (the number of words
after D00011 plus 1 for D00010 itself) is stored.

S:D00000

D00011

Number of words

Receive data

Number of send words plus 1 for D00010

Number of words

c. Execute PMCR(260)

4. For details on the confirming operation, see Section 12 Tracing and I/O
Memory Monitoring.

• Transmission Line Tracing
The data in the send/receive messages flowing over the transmission
line (RS-232C or RS-422A/485) and the control codes are traced.

• I/O Memory Monitoring
Monitors send/receive data and the status of the various flags.

1:N NT Links

Refer to the user’s manual for the PT.

Serial Gateway Mode

• Sending FINS commands from the PLC
Send FINS commands using the CMND(490) instruction. For details, refer
to 6-8-5 Sending Commands Using the CMND(490) Instruction.

• Sending FINS commands from the PT
Execute the PT’s SAP (Smart Active Parts) library.

• Sending FINS commands from a Programming Device that uses CX­Server as the communications driver, such as the CX-Programmer.

56

Basic Operating Procedure Section 1-9

System Configuration Example

Serial Communications Board/Unit with unit Ver. 1.2 or later
(Select SCU (Unit 0 to 15) in the UNIT field.)

Set the relay PLC.
(Select in the Change PLC Dialog Box.)

Serial Gateway function
port (Select port 1/2 in the
PORT field according to the
calculated address.)

Serial

Gate-

way

Host Link FINS

PLC name: PLC2

1. Register the PLC to be connected serially (using Host Link FINS) in the
project gateway (e.g., PLC2).

2. In the Change PLC Dialog Box of the target PLC (e.g., PLC1), select the
relay PLC (gateway PLC) in the Network Type pull-down menu (e.g.,
[PLC2] (See note.)) and click the Settings Button to the right of the Net­work Type pull-down menu.

Note The PLC name enclosed in square brackets (e.g., [PLC2]) indicates

the gateway PLC.

CX-Programmer Ver. 5.0 or later

Network type: Select [PLC2].

Select the Use SYSWAY with the port option in
the Host Link (SYSWAY) settings.

PLC name: PLC1
Target PLC Host Link unit number

Enter the Host Link unit number in the
Host Link Unit Number field for the target
PLC in the Host Link (SYSWAY) settings.

Select the PLC to be used as the
relay PLC (e.g., [PLC2]) in the
Network Type pull-down menu.

3. The Network Settings Dialog Box will be displayed. Click the Guide for Se-
rial Gateway Button. The Serial Gateway Guide Dialog Box will be dis­played.

4. The Serial Gateway Guide Dialog Box will be displayed.
Select the unit and the port number under the Calculate Address Area, the
serial port number address is automatically calculated in the Calculated
Address Field.
Select the Use SYSWAY with the port option, and enter the actual Host
Link unit number for the target (communications partner) PLC in the Host
Link Unit Number field (see note).
Finally, click the Apply Button.

57

Basic Operating Procedure Section 1-9

The Serial
Communications port
address is automatically

Select the Unit.

Select the port.

Select this option.

Enter the unit number for the
actual Host Link (values are
incremented by 1 automatically).

Note When using the CX-Programmer, enter the actual Host Link unit number. Do

not add 1 to the value. The CX-Programmer will automatically add 1 internally.

No-protocol Mode

Use the following procedure when creating ladder programs.

calculated.

a) Sending to Serial Communications Boards

Execute the TXD(236) instruction to send the program to the external
device from the PLC.

Note For the TXD(236) instruction, include a NO condition of the Send

Ready Flag (bit A35605/A35613) in an AND in the input condition.

Execute the RXD(235) instruction to receive the program at the PLC from
the external device.

Note For the RXD(235) instruction, include a NO condition of the Recep-

tion Completed Flag (bit A35606/A35614) in an AND in the input con­dition.

b) Sending to Serial Communications Units

Execute the TXDU(256) instruction to send the program to the external
device from the PLC.

Note For the TXDU(256) instruction, include a NO condition of the Com-

munications Port Enabled Flag (bits A20200 to A20207) and a NC
condition of the TXDU(256) Executing Flag (word n+9/n+19, bit 05)
in an AND in the input condition.

Execute the RXDU(255) instruction to receive the program at the PLC
from the external device.

Note For the RXDU(255) instruction, include NO conditions of the Recep-

tion Completed Flag (word n+9/n+19, bit 06) and the Communica­tions Port Enabled Flags (bits A20200 to A20207) in an AND in the
input condition.

58

Basic Operating Procedure Section 1-9

Modbus-RTU Slave Mode

Modbus-RTU commands are sent from the host computer to the PLC.

Programming to
send commands and
receive responses.

Host computer

Serial Communications Board/Unit

Command

The host computer must be programmed to send the Modbus-RTU com­mands and receive responses.

59

Basic Operating Procedure Section 1-9

60

SECTION 2

Initial Settings and I/O Memory Allocations

This section describes the components of the Serial Communications Boards and the Serial Communications Units, the
settings required for operation, and the memory allocated in the I/O memory of the CPU Unit for controlling and
monitoring communications.

2-1 Component Names and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

2-1-1 Serial Communications Boards (CS Series Only) . . . . . . . . . . . . . . 62

2-1-2 CS-series Serial Communications Unit . . . . . . . . . . . . . . . . . . . . . . 66

2-1-3 CJ-series Serial Communications Unit. . . . . . . . . . . . . . . . . . . . . . . 69

2-2 Data Exchange with the CPU Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

2-2-1 Serial Communications Board (CS Series Only) . . . . . . . . . . . . . . . 72

2-2-2 Serial Communications Units (CS/CJ Series) . . . . . . . . . . . . . . . . . 73

2-3 I/O Memory Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

2-3-1 DM Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

2-3-2 CIO Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

2-3-3 Related Auxiliary Area Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

61

Component Names and Functions Section 2-1

2-1 Component Names and Functions

2-1-1 Serial Communications Boards (CS Series Only)

Indicators

CS1W-SCB21-V1

RDY
COMM1
COMM2

PORT1

PORT2

SCB21-V1

Indicators

Por t 1
RS-232C

Por t 2
RS-232C

CS1W-SCB41-V1

RDY
COMM1
COMM2

PORT1

ON TERM

OFF

4 WIRE

2

PORT2
(RS422/
RS485)

SCB41-V1

Terminating resistance switch

2-wire or 4-wire switch

Por t 2
RS-422A/485

Indicator Color Status Meaning

RDY Green Lit Operating normally, and protocol macro prepara-

tions have been completed.

Flashing Operating normally, and protocol macros are

being prepared. ()

Not lit An error has occurred in the Serial Communica-

tions Board.
Board/Unit error, CPU Unit watchdog timer error,

Board watchdog timer error

COMM1 Yellow Lit Port 1 is being used for sending or receiving.

Not lit Port 1 is not being used for sending or receiving.

COMM2 Yellow Lit Port 2 is being used for sending or receiving.

Not lit Port 2 is not being used for sending or receiving.

Note Depending on the interval of flashing, the meaning is as follows:

Protocol data being initialized: 0.3 s
Protocol data being overwritten: 1.0 s
Protocol data error: 1.0 s and CPU Unit ERR/ALM indicator is flashing

CPU Unit Indicators A Serial Communications Board is mounted as an Inner Board in the CPU

Unit and thus affect the CPU Unit ERR/ALM indicator.

Indicator Color Status Meaning

ERR/ALM Red Lit Fatal error If a fatal error occurs, the CPU

Unit will stop operation in either
RUN or MONITOR mode.

Flashing Non-fatal

error

If a non-fatal error occurs, the
CPU Unit will continue opera­tion in either RUN or MONITOR
mode.

Not lit Normal

operation

The CPU Unit is operating nor­mally.

If an error in the Inner Board is the cause of the error indicated on the ERR/
ALM indicator, information on the error will be stored in A424: Inner Board

62

Component Names and Functions Section 2-1

Error Information. Refer to Inner Board Error Information under 2-3-3 Related
Auxiliary Area Bits.

For actions required when an error occurs, refer to Section 11 Troubleshooting
and Maintenance.

RS-232C Ports

Protocol Host Link Protocol macro 1:N NT Links

Communications
method

Synchronization Start-stop synchronization (asynchronous)
Baud rate 1,200/2,400/4,800/

Connections 1:1 (1:N is possible using Link Adapters)

Transmission
distance

Interface Complies with EIA RS-232C

Note 1. High-speed NT link is only available with Serial Communications Boards/

Units manufactured on or after December 20th, 1999. With earlier models,
only standard NT link is available.

2. The maximum cable length for RS-232C is 15 m. The RS-232C standard,
however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.

Full-duplex Full-duplex or half-

9,600/19,200/
38,400/57,600/
115,200 bps

15 m max. (see note 2)

duplex

1,200/2,400/4,800/
9,600/19,200/
38,400 bps

Half-duplex

Standard NT link or
high-speed NT link

Connector Pin Layout

Pin No. Abbreviation Signal name I/O

1 (see note 1) FG Shield --­2 SD Send data Output
3 RD Receive data Input
4 (see note 2) RTS (RS) Request to send Output
5 (see note 2) CTS (CS) Clear to send Input
6 (see note 3) 5V Power supply --­7 (see note 2) DSR (DR) Data set ready Input
8 (see note 2) DTR (ER) Data terminal ready (see

note 4)
9 SG Signal ground --­Shell (see note 1) FG Shield ---

Output

Note 1. Pin No. 1 and the shell are connected to the ground terminal (GR) of the

Power Supply Unit inside of the Serial Communications Board. Therefore,
the cable shield can be grounded by grounding the GR of the Power Sup­ply Unit.

2. The status of the RTS (RS), CTS (CS), DSR (DR), and DTR (ER) signals
can be monitored in the words allocated in the CIO Area. For details, refer
to 2-3 I/O Memory Allocations.

3. Pin 6 (5 V) is required when the NT-AL001-E Link Adapter is connected.
For details on connection methods, refer to 3-3 Wiring.

4. The DSR signal is used to monitor the signal cable. It can also be used as
a CD (carrier detect) signal. (The DSR signal does not affect system oper­ation, and is available for use by the user.)

63

Component Names and Functions Section 2-1

!Caution Do not connect the 5-V power supply of Pin 6 to any external device other

than an NT-AL001-E Link Adapter. Otherwise, the external device and the
Serial Communications Board or Unit may be damaged.

The following cables are provided for connection to NT-AL001-E Link Adapt­ers. We recommend that these cables be used.
NT-AL001-E connecting cables: XW2Z-070T-1 (0.7 m)

XW2Z-200T-1 (2 m)

Applicable Connectors

Plug: XM2A-0901 (manufactured by OMRON) or equivalent
Hood: XM2S-0911-E (manufactured by OMRON) or equivalent
One plug and one hood are provided for each port.

Recommended Cables

UL2426 AWG28 × 5P IFS-RVV-SB (UL-approved, Fujikura Ltd.)
AWG28

UL2426-SB (MA) 5P × 28AWG (7/0.127) (UL-approved, Hitachi Cable, Ltd.)
CO-MA-VV-SB 5P

Cable length: 15 m max.

RS-422A/485 Port

Communications
method

Synchronization Start-stop synchronous (asynchronous)
Baud rate 1,200/2,400/4,800/

Connections 1:N (N: 32 Units max.) 1:N (N: 8 Units

Transmission dis­tance

Interface Complies with EIA RS-485

× 5P IFVV-SB (not UL-approved, Fujikura Ltd.)

× 28AWG (7/0.127) (not UL-approved, Hitachi Cable, Ltd.)

Protocol Host Link Protocol macro 1:N NT Links

Full-duplex Full-duplex or half-

9,600/19,200/
38,400/57,600/
115,200 bps

500 m max. (The total combined cable length is 500 m max. T­branch lines must be a maximum of 10 m long.)

duplex

1,200/2,400/4,800/
9,600/19,200/
38,400 bps

Half-duplex

Standard NT link or
high-speed NT link
(See note.)

max.)

64

Note High-speed NT link is only available with Serial Communications Boards/Units

manufactured on or after December 20th, 1999. With earlier models, only
standard NT link is available.

Connector Pin Layout

Pin No. Abbreviation Signal name I/O

1 (see note 1) SDA Send data - Output
2 (see note 1) SDB Send data + Output
3 NC Not used --­4 NC Not used --­5 NC Not used --­6 (see note 1) RDA Receive data - Input
7 NC Not used --­8 (see note 1) RDB Receive data + Input
9 NC Not used --­Shell (see note 2) FG Shield ---

Note 1. When 2-wire connections are used, use Pins 1 and 2, or Pins 6 and 8.

Component Names and Functions Section 2-1

2. The shell is connected to the ground terminal (GR) of the Power Supply
Unit inside of the Serial Communications Board. Therefore, the cable
shield can be grounded by grounding the GR of the Power Supply Unit.

3. With SDA/B or RDA/B, the signal polarity may be reversed by the remote
device. Be sure to check the polarity before wiring.

Applicable Connectors

Plug: XM2A-0901 (OMRON) or equivalent
Hood: XM2S-0911-E (OMRON) or equivalent
One plug and one hood are provided for each port.

Recommended Cables

CO-HC-ESV-3P × 7/0.2 (manufactured by Hirakawa Hewtech Corp.)
Cable length: 500 m max. (The total combined cable length is 500 m max. T­branch lines must be a maximum of 10 m long.)

Terminating Resistance
Switch: TERM

2-Wire or 4-Wire Switch:
WIRE

External Dimensions

CS1W-SCB21-V1

The terminating resistance switch is provided on the CS1W-SCB41-V1 only.
When an RS-422/485 port is used, set the switch to ON if the Serial Commu-

nications Board is on the end of the transmission line. Refer to Section 3
Installation and Wiring for the ON/OFF settings.

Label Name Settings Factory setting

TERM Terminating

resistance switch

ON: Terminating

resistance ON

OFF: Terminating

resistance OFF

OFF: Terminating

resistance OFF

Note The status of terminating resistance setting can be monitored in the words

allocated in the CIO Area. For details, refer to 2-3 I/O Memory Allocations.

The 2-wire or 4-wire switch is provided on the CS1W-SCB41-V1 only.
When an RS-422/485 port is used, set the switch to “2” when 2-wire connec-

tions are used, and set the switch to “4” when 4-wire connections are used.
For details, refer to Section 3 Installation and Wiring.

Label Name Settings Factory setting

WIRE 2-wire or 4-wire

switch

CS1W-SCB41-V1

2: 2-wire
4: 4-wire

Mounted in the CPU Unit

2: 2-wire

SCB21-V1

130

SCB41-V1

65

Component Names and Functions Section 2-1

F

E

D

C

B

A

9

8

7

6

5

4

3

2

1

0

F

E

D

C

B

A

9

8

7

6

5

4

3

2

1

0

2-1-2 CS-series Serial Communications Unit

Indicators

CS1W-SCU21-V1

SCU21-V1

RUN

ERC
SD1
RD1

UNIT
No.

RDY
ERH
SD2
RD2

PORT1

Indicators

Unit number
switch

Por t 1
RS-232C

CS1W-SCU31-V1

SCU31-V1

RUN
ERC
SD1
RD1
TER1

TERM OFF

PORT1
(RS422
/485)

UNIT
No.

WIRE 2

RDY
ERH
SD2
RD2
TER2

ON

4

Terminating resistance switch
(for port 1)

2-wire or 4-wire switch
(for port 1)

Port 1
RS-422A/485

Terminating resistance switch

ON

(for port 2)

4

2-wire or 4-wire switch
(for port 2)

Port 2

PORT2

Por t 2
RS-232C

TERM OFF

WIRE 2

PORT2
(RS422
/485)

RS-422A/485

Indicator Color Status Meaning

RUN Green Lit Operating normally

Not lit Unit hardware error.

RDY Green Lit Protocol macro preparations have been com-

pleted.

Flashing Protocol macros are being prepared. (see note

1)

Not lit Hardware error in Serial Communications Unit.

ERH Red Lit CPU Unit error, or this Unit has not been regis-

tered in the I/O table. Routing tables incor-

rectly registered in the Unit.
Flashing System Setup error (see note 2)
Not lit CPU Unit is operating normally and the Setup

Area settings are normal.

ERC Red Lit Unit hardware error, or loopback test error

Flashing Protocol data syntax error or protocol data

error (SUM error).
Not lit Unit is operating normally.

SD1 Yellow Lit Port 1 is being used for sending.

Not lit Port 1 is not being used for sending.

RD1 Yellow Lit Port 1 is being used for receiving.

Not lit Port 1 is not being used for receiving.

TER1 (see
note 3)

Yellow Lit Terminating resistance is connected internally

for port 1.
Not lit Terminating resistance is not connected inter-

nally for port 1.

SD2 Yellow Lit Port 2 is being used for sending.

Not lit Port 2 is not being used for sending.

RD2 Yellow Lit Port 2 is being used for sending.

Not lit Port 2 is not being used for sending.

TER2 (see
note 3)

Yellow Lit Terminating resistance is connected internally

for port 2.
Not lit Terminating resistance is not connected inter-

nally for port 2.

66

Component Names and Functions Section 2-1

Note 1. Depending on the interval of flashing, the meaning is as follows:

Protocol data being initialized: 0.3 s
Protocol data initialized, or being overwritten: 1.0 s
Protocol data error: 1.0 s and CPU Unit ERC indicator is flashing

2. The Setup Area is allocated in the DM Area according to the unit number
setting. For details, refer to 2-3 I/O Memory Allocations.

3. Only the CS1W-SCU31-V1 is equipped with the TER1 and TER2 indica­tors.

For the action required when an error occurs, refer to Section 11 Trouble-
shooting and Maintenance.

UNIT No. Switch: Unit
Number

RS-232C Ports The specifications of the RS-232C are the same as those for the RS-232C

RS-422A/485 Ports The specifications of the RS-422A/485 port are the same as those for the RS-

Set the CPU Bus Unit unit number for the Unit. The CIO Area and DM Area
are allocated according to the unit number setting. The words that are allo­cated are used for the software switches, Status Area, and the System Setup.
Set the unit number between 0 and F. The factory setting is for unit number 0.

port on the Serial Communications Board. See RS-232C Ports on page 63.

422A/485 port on the Serial Communications Board. See RS-422A/485 Port
on page 64.

67

Component Names and Functions Section 2-1

F

E

D

C

B

A

9

8

7

6

5

4

3

2

1

0

F

E

D

C

B

A

9

8

7

6

5

4

3

2

1

0

Dimensions (Unit: mm)

CS1W-SCU21-V1

SCU21-V1

RUN
ERC

SD1

RD1

130

CS1W-SCU31-V1

SCU31-V1

RUN
ERC

SD1
RD1

TER1

TERM OFF

PORT1

130

(RS422
/485)

UNIT
No.

35

UNIT
No.

WIRE 2

RDY
ERH
SD2
RD2

PORT1

PORT2

RDY
ERH
SD2
RD2
TER2

100

ON

4

TERM OFF

WIRE 2

PORT2
(RS422
/485)

35

ON

4

100

68

Component Names and Functions Section 2-1

2-1-3 CJ-series Serial Communications Unit

CJ1W-SCU21-V1

SCU21-V1

RUN

ERC

RD1

SD1

SD2

RD2

ERH

RDY

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1

PORT2

CJ1W-SCU31-V1

SCU31-V1

TERM

WIRE

OFF

RUN

RDY

2ON4

ERC

ERH

TER1

RD1

SD1

SD2

TER2

RD2

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1

(RS422
/485)

Indicators

Unit number switch

Port 1: RS-232C

Port 2: RS-232C

Indicators

Terminating resistance
switch (for port 1)

Unit number switch

2-wire/4-wire switch
(for port 1)

Port 1: RS-422A/485

CJ1W-SCU41-V1

SCU41-V1

TERM

WIRE

OFF

RUN

RDY

2ON4

TER1

ERC

RD1

SD1

SD2

RD2

ERH

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1
(RS422
/485)

PORT2

Magnified view of
bottom-right corner

Indicators

Terminating resistance switch

Unit number switch

2-wire/4-wire switch

Port 1: RS-422A/485

Port 2: RS-232C

Indicators

PORT2

(RS422
/485)

TERM

OFF

WIRE

2ON4

Terminating resistance
switch (for port 2)

Port 2: RS-422A/485

2-wire/4-wire switch
(for port 2)

Indicator Color Status Meaning

RUN Green Lit Operating normally

Not lit Unit hardware error.

RDY Green Lit Protocol macro preparations have been com-

pleted.

Flashing Protocol macros are being prepared (see note

1).

Not lit Hardware error in Serial Communications Unit.

ERH Red Lit CPU Unit error, or this Unit has not been regis-

tered in the I/O table. Routing tables incor-

rectly registered in the Unit.
Flashing System Setup error (see note 1)
Not lit CPU Unit is operating normally and the Setup

Area settings are normal.

69

Component Names and Functions Section 2-1

Indicator Color Status Meaning

ERC Red Lit Unit hardware error

Flashing Protocol data syntax error or protocol data

Not lit Unit is operating normally.

SD1 Yellow Lit Port 1 is being used for sending.

Not lit Port 1 is not being used for sending.

RD1 Yellow Lit Port 1 is being used for receiving.

Not lit Port 1 is not being used for receiving.

TER1
(see note

3)

SD2 Yellow Lit Port 2 is being used for sending.

RD2 Yellow Lit Port 2 is being used for receiving.

TER2
(see note

4)

Yellow Lit Terminating resistance is connected internally

Not lit Terminating resistance is not connected inter-

Not lit Port 2 is not being used for sending.

Not lit Port 2 is not being used for receiving.

Yellow Lit Terminating resistance is connected internally

Not lit Terminating resistance is not connected inter-

error (SUM error).

for port 1.

nally for port 1.

for port 2.

nally for port 2.

Note 1. Depending on the interval of flashing, the meaning is as follows:

Protocol data being initialized: 0.3 s
Protocol data initialized, or being overwritten: 1.0 s
Protocol data error: 1.0 s and CPU Unit ERC indicator is flashing

2. The Setup Area is allocated in the DM Area according to the unit number
setting. For details, refer to 2-3 I/O Memory Allocations.

3. Only the CJ1W-SCU31-V1/41-V1 is equipped with a TER1 indicator.

4. Only the CJ1W-SCU31-V1 is equipped with a TER2 indicator.

For the action required when an error occurs, refer to Section 11 Trouble-
shooting and Maintenance.

Unit Number Switch Set the CPU Bus Unit unit number for the Unit. The CIO Area and DM Area

are allocated according to the unit number setting. The words that are allo­cated are used for the software switches, Status Area, and the System Setup.
Set the unit number between 0 and F. The factory setting is for unit number 0.

RS-422A/485 Port The specifications of the RS-422A/485 port are the same as those for the RS-

422A/485 port on the Serial Communications Board. See RS-422A/485 Port
on page 64.

RS-232C Port The specifications of the RS-232C are the same as those for the RS-232C

port on the Serial Communications Board. See RS-232C Ports on page 63.

70

Component Names and Functions Section 2-1

Dimensions (Unit: mm) CJ1W-SCU21-V1

31 65

SCU21-V1

RUN

ERC

RD1

SD1

SD2

RD2

ERH

RDY

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1

90

PORT2

CJ1W-SCU31-V1

31 65

SCU31-V1

TERM

WIRE

RUN

RDY

OFF

2ON4

TER1

ERC

RD1

SD1

SD2

RD2

TER2

ERH

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1
(RS422
/485)

90

PORT2
(RS422
/485)

TERM

OFF

WIRE

2ON4

CJ1W-SCU41-V1

31 65

SCU41-V1

RUN

RDY

TERM

OFF

WIRE

2ON4

90

TER1

ERC

RD1

SD1

SD2

RD2

ERH

UNIT

5

4

6

3

7

2

8

1

9

0

A

NO.

F

B

E

C

D

PORT1

(RS422
/485)

PORT2

71