Omron CJ, CJ2*-CPU, CJ2H-CPU6, CJ2M-CPU, 3G3MX2 V1 Connection Manual

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3G3AX-MX2-EIO15-E

OMRON

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CJ Series

(RS-485 Modbus Communication)

(3G3MX2 Series Type V1)

General-purpose Serial
Connection Guide

OMRON Corporation
Multi-function Compact Inverter

P641-E1-01

About Intellectual Property Rights and Trademarks

Microsoft product screen shots reprinted with permission from Microsoft Corporation.
Windows is a registered trademark of Microsoft Corporation in the USA and other countries.
Company names and product names in this document are t he trademarks or registered
trademarks of their respective companies.

Table of Contents

1. Related Manuals ........................................................................................ 1

2. Terms and Definitions ............................................................................... 2

3. Precautions ................................................................................................ 3

4. Overview .................................................................................................... 4

5. Applicable Devices and Device Configuration ....................................... 5

5.1. Applicable Devices ............................................................................. 5

5.2. Device Configuration .......................................................................... 6

6. Serial Communications Settings ............................................................. 8

6.1. Parameters ........................................................................................ 8

6.2. Cable Wiring Diagram ........................................................................ 9

7. Serial Communications Connection Procedure ................................... 10

7.1. Work Flow ........................................................................................ 10

7.2. Setting up Inverter ............................................................................. 11

7.3. Setting up PLC ................................................................................. 17

7.4. Checking the Serial Communications .............................................. 31

8. Initialization Method ................................................................................ 35

8.1. Initializing PLC ................................................................................. 35

8.2. Initializing Inverter ............................................................................ 36

9. Program .................................................................................................... 37

9.1. Overview .......................................................................................... 37

9.2. Destination Device Command .......................................................... 42

9.3. Error Detection Processing .............................................................. 44

9.4. Memory Maps .................................................................................. 45

9.5. Ladder program ............................................................................... 48

9.6. Timing Chart ..................................................................................... 54

9.7. Error processing ............................................................................... 55

10. Revision History .................................................................................. 57

1．Related Manuals

1

1. Related Manuals

To ensure syst em safety, make sure to always read and heed the information provided in all
Safety Precautions and Precautions for Saf e Use of manuals for each device which is used in
the system.
The table below lists the manuals related to thi s document.

Cat. No. Model Manual name

W472 CJ2H-CPU6[]-EIP

CJ2H-CPU6[]
CJ2M-CPU[][]

W473 CJ2H-CPU6[]-EIP

CJ2H-CPU6[]
CJ2M-CPU[][]

W336 CJ1W-SCU[]1-V1

CJ1W-SCU[]2

W446 - CX-Programmer OPERATION MANUAL
W342 CJ2[]-CPU[][] CJ Series

W474 CJ2[]-CPU[][] CJ Series

I585 3G3MX2-A[][][][]-V1 Multi-function Compact Inverter

CJ Series
CJ2 CPU Unit Hardware USER’S MANUAL

CJ Series
CJ2 CPU Unit Software USER’S MANUAL

CJ Series
Serial Communications Units
OPERATION MANUAL

Communications Commands
REFERENCE MANUAL

Programmable Controllers
INSTRUCTIONS REFERENCE MANUAL

MX2 Series Type V1 User’s Manual

2

2. Terms and Definitions

Term Explanation and Definition
Serial Gateway
mode

This is a function of PLC that performs serial communic ations by
automatically converting a message (command data) to a specified
protocol (either CompoWay/F, Modbus-RTU, or Modbus-ASCII)
depending on a type of message.

2．Terms and Definitions

3．Precautions

3

Precautions for Safe Use

Precautions for Correct Use

Additional Information

Symbol

3. Precautions

(1) Understand the specifications of devices which are used in the system. Allow some

margin for ratings and performance. Provide saf ety measures, such as installing safety
circuit, in order to ensure safety and minimize ri sks of abnormal occurrence.

(2) To ensure syst em safety, make sure to always read and heed the information provided in

all Safety Precautions and Precautions for Safe Use of manuals for each device which is
used in the system.

(3) The user is encouraged to confirm the standards and regulations that the system must

conform to.

(4) It is prohibited to copy, to reproduce, and to distribute a part or the whole of this

document without the permission of OMRON Corporat ion.

(5) The information contained in this document is current as of November 2015. It is subject

to change without notice for improvement.

The following notations are used in this docum ent.

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

Precautions on what to do and what not to do to ensure saf e usage of the product.

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

Additional information to read as required.
This information is provided to increase unders tanding or make operation easier.

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

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

4

4. Overview

Serial communications

(RS-485)

Command data

Response data

This document describes the procedures f or connecting 3G3MX2 Series Type V1
Multi-function Compact Inverter (hereinafter referred to as Inverter) of OMRON Corporation
(hereinafter referred to as OMRON) to CJ-series Programmable Controller + Serial
Communications Unit (hereinafter referred t o as PLC) of OMRON using serial
communications as well as the procedures for checking their connections.
Refer to Section 6. Serial Communications Set tings and Section 7. Serial Communications
Connection Procedure to understand setting methods and key points to send or receive
messages using serial communications.
The ladder program in a prepared CX-Programm er project file is used to check the serial
connection by sending or receiving the messages of ''Total Power ON Time Monitor'' to/from
Inverter.

■Send/Receive messages of ''Total Power ON Time Monitor''

4．Overview

PLC

Sending the command data Executing the command

Receiving the response data

and storing in memory

Prepare a latest CX-Programmer project file bef orehand. To obtain a project file, contact your
OMRON representative.

Name File name Version
CX-Programmer project file
(extension: cxp)

This document aims to explain the wiring methods and communications settings
necessary to connect the corresponding devices and provide the setting
procedures. The program used in this document is designed to chec k if the
connection was properly established and i s not designed to be constantly used
at a site. Therefore, functionality and performances are not sufficiently t aken
into consideration.
When you construct an actual system, please use the wiring methods,
communications settings, and setting procedures described in this document as
a reference and design a new program according to your application needs.

OMRON_3G3MX2-V1_Mod485_EV100.cxp Ver.1.00

Returning the response data

Inverter

5．Applicable Devices and Device Configuration

5

OMRON

CJ2 CPU Unit

CJ2□-CPU[][]

OMRON

Serial Communications Unit

CJ1W-SCU[]1-V1
CJ1W-SCU[]2

OMRON

Inverter

your OMRON representative.

5. Applicable Devices and Device Configuration

5.1. Applicable Devices

The applicable devices are as follows:

Manufacturer Name Model

3G3MX2-A[][][][]-V1

Precautions for Correct Use

As applicable devices above, the devices with the models and versions listed in 5.2. Device
Configuration are actually used in this document to describe the procedure for connecting

devices and checking the connection.
You cannot use devices with versions lower than the versions listed in 5.2.
To use the above devices with models not listed in 5.2. or versions higher than those listed in

5.2., check the differences in the specifications by referring to t he manuals before operating
the devices.

Additional Information

This document describes the procedure to es tablish the network connection. It does not
provide information on operation, installation, wiring method, device functionality or device
operation which is not related to the connection pr ocedure. Refer to the manuals or contact

5．Applicable Devices and Device Configuration

6

OMRON

Serial Communications Unit

CJ1W-SCU42

Ver.2.0

OMRON

CPU Unit

CJ2M-CPU12

Ver.2.0

OMRON

Power Supply Unit

CJ1W-PA202

OMRON

CX-One

CXONE-AL[][]C-V4

/AL[][]D-V4

Ver.4.[][]
OMRON

CX-Programmer

(Included in CX-One)

Ver.9.54

OMRON

CX-Programmer project file

OMRON_3G3MX2-V1_M
od485_EV100.cxp

Ver.1.00

-

Personal computer
(OS: Windows 7)

- -

USB cable
(USB 2.0 type B connector)

-

-

Serial cable (RS-485)

- OMRON

Inverter

3G3MX2- A2002-V1

V2.0

Precautions for Correct Use

Precautions for Correct Use

Precautions for Correct Use

Serial cable

(RS-485)

CJ2M-CPU12+
CJ1W-SCU42

Personal computer

3G3MX2

V1

5.2. Device Configuration

The hardware components to reproduce the connect i on procedures of this document are as
follows:

(CX-One installed,
OS: Windows 7)

Manufacturer Name Model Version

USB cable

- A2002-

Prepare a latest project file beforehand.
To obtain a project file, contact your OMRON representative.

Update CX-Programmer to the version specifi ed i n thi s clause or higher version.
If you use a version higher than the one specified in this clause, the procedures and related
screenshots described in Sect ion 7. and subsequent sections may not be applicable. In that
case, use the equivalent procedures described i n this document by referring to the
CX-Programmer OPERATION MANUAL (Cat. No. W446).

Turn ON the terminating resistance switch on Serial Communications Unit and connect a 100
to 125Ω(1/2W) terminating resistor to the end of Inverter on RS-422A/485 port.

5．Applicable Devices and Device Configuration

7

Precautions for Correct Use

Additional Information

Additional Information

The maximum length of communications c able for Inverter is 500m.
Make sure to connect Serial Communications Uni t and Inverter with a 500m or less serial
cable (RS-485).

For information on the serial cable (RS-485), refer to 3-4 RS-232C and RS-422A/485 Wiring
of the CJ Series Serial Communications Unit s OPERATION M ANUA L (Cat. No. W336).

The system configuration in this document uses USB for the connection between Personal
computer and PLC. For information on how to install a USB driver, refer to A-5 Installing t he
USB Driver in Appendices of the CJ-series CJ2 CPU Unit Hardware USER'S MANUAL (Cat.
No. W472).

6．Serial Communications Settings

8

Precautions for Correct Use

6. Serial Communications Settings

This section describes the specifications of parameters and wirings that are set in this
document.

6.1. Parameters

The parameters required for connecting PLC and Inverter using serial communications are
shown below.

Item
Unit number 0 ­Address number
(Slave address)

Communications (Connection )
port
Terminating resistor Yes (TERM: ON) No

2-wire or 4-wire 2-wire (WIRE: 2) 2-wire (Fixed)
Serial communications mode Serial Gateway ­Data length
(Transmission character)
Stop bit 1 bit 1 bit (Default)

Parity (Parity bit) No No (Default)

Transmission rate (Baud rate) 9,600 bps (Default) 9,600 bps (Default)

Communication selection - Modbus communication (Default )

PLC (Serial Communications Unit)

- 1 (Default)
(C072: Communication Station No.
Selection =1.)

Port 1 (RS-422/485)

8 bits 8 bits (Fixed)

-

(Terminating register selector switch OFF)

(C075: Communication Stop Bit Selection
= 01)

(C074: Communication Parity Selec tion =

00)

(C071: Communication Speed Select i on
= 05)

(C096: Communication Selection = 00)

Inverter

This document describes the setting procedures of CJ1W-SCU42 Serial Communications
Unit with unit number 0 and communications (connection) port 1. To connect devices under
different conditions, change the CIO area and the control wor d of CMND instruction used in
the program. Refer to Section 9. Program for details.

6．Serial Communications Settings

9

Pin No.

Symbol

Signal name

Input/Output

(CJ1W-SCU42).

Terminating resistor

6.2. Cable Wiring Diagram

Refer to SECTION 3 Installation and Wiring of the CJ Series Serial Communications Units
OPERATION MANUAL (Cat. No. W336) for details on cable wirings.

Check connector configurations and signal li nes (pin assignments) before wiring.

■Connector configurations and signal lines (pin assignments)
CJ1W-SCU42 Serial Communications Unit applicable connector: Terminal block

1(See note 1.) RDA Receive data - Input
2(See Note 1.) RDB Receive data + Input
3(See Note 1.) SDA Send data - Output
4(See Note 1.) SDB Send data + Output
5(See Note 2.) FG Shield -

Note 1: For 2-wire connection, use either pins 1 and 2 or pi ns 3 and 4.
Note 2: Pin 5 (Shield) is connected to the GR terminal on Power Supply Unit though Serial

Communications Unit. The cable shield can thus be grounded by grounding the GR
terminal of Power Supply Unit.

Inverter (3G3MX2-A[][][][]-V1) applicable connector: Terminal block

Control Circuit Terminal

■Cable/Pin assignments
Serial Communications Unit

RS-422A/
485
interface

Terminal block Terminal block

Signal
name
RDA- 1 A1 RS­RDB+ 2 B1 RS+
SDA- 3
SDB+ 4
FG 5

Pin No. Terminal

Inverter (3G3MX2-A[][][][]-V1)

Signal

block

name

RS-485
interface

7．Serial Communications Connection Procedure

10

7.2. Setting up Inverter

Set up Inverter.

Set the hardware switches on Inverter and connect
the cables.

Set the parameters for Inverter.

7.3. Setting up PLC

Set up PLC.

Set the hardware switches on Serial Communicati ons
Unit and connect the cables.

Start CX-Programmer, open the project file, and
Create the I/O table for PLC.

Set the parameters for Serial Communications Uni t.

7.3.5. Transferring the Project Data

Transfer the project data to PLC.

Communications

Start the send/receive processing and check that
Check that the correct data is written to the I/O

memory of PLC by using CX-Programmer.

7. Serial Communications Connection Procedure

This section describes the procedures for connecting PLC to Inverter using serial
communications.
In this document, the explanations of procedures for setting up PLC and Inverter are based on
the factory default settings. For the initializ ation, refer to Section 8. Initialization Method.

7.1. Work Flow

Take the following steps to connect PLC to Inverter using serial communications, and send
and receive messages.

↓

7.2.1. Hardware Settings
↓

7.2.2. Parameter Settings

↓

↓

7.3.1. Hardware Settings
↓

7.3.2. Opening the Project File and

Connecting Online with PLC

↓

7.3.3. Creating the I/O Table
↓

7.3.4. Parameter Settings
↓

connect online with PLC.

↓

7.4. Checking the Serial

↓

7.4.1. Checking the Receive Data

serial communications are normally performed.

7．Serial Communications Connection Procedure

11

1

following procedure.

2

1: Loosen the mounting screw (x 1) from Option Unit Cover of the Inverter

3

Check that Terminating Resistor

4

Connect a Serial cable to

RS-485 terminal

Terminating resistor

Option Unit Cover

Mounting screw

Control Circuit
T erminal Block A
Control Circuit
Terminal Block B

SDB+
SDA-

7.2. Setting up Inverter

Set up Inverter.

7.2.1. Hardware Settings

Set the hardware switches on Inverter and connect the c abl es.

Precautions for Correct Use

Make sure that the power supply is OFF when you perform the setting up.

Make sure that the power supply
to Inverter is OFF.

*If the power supply is turned

ON, settings may not be
applicable as described in the

Remove Option Unit Cover from
the Inverter front panel as
shown in the right figure.

front panel.

2: Remove Option Unit Cover.

Selector Switch inside of the
terminal block cover is OFF.

RS-485 terminal (RS-, RS+).
Connect Terminating resistor
(120Ω 1/2W) to RS-485 terminal
(RS-, RS+).

Serial cable

12

Connect 3-Phase 200 VAC

No. I585).

6

Main power supply input

3-Phase 200 VAC

Power supply

5

power supply to Main power
supply input terminal on Inverter
with a Power supply cable.

*For details on wiring

specifications of the power
supply, refer to 2-3 Wiring of
the Inverter Multi-function

Compact Inverter MX2 Series
Type V1 User’s Manual (Cat.

7．Serial Communications Connection Procedure

terminal

cable

power supply

Mount Option Unit Cover on the
Inverter front panel.

13

7.2.2. Parameter Settings

1

2

3

output frequency.

0.00

Data display

Operation keys

Data display.

Set the parameters for Inverter.

Check the positions of Data
display and Operation keys on
Digital Operator.

7．Serial Communications Connection Procedure

Digital Operator

Turn ON the power supply to
Inverter.
Use the procedure on the right
to display the parameters in the
extended function mode C.

*If the output frequency is not

displayed in Data display, press
and hold the Mode Key for 3
seconds or more to display the

The output frequency is displayed in

Press the Mode Key 5 times.

C001 parameter is displayed.

c001

14

Use the procedure on the right

c001

c071

c071

c072

Check that the displayed value is the

Check that the displayed value is the

4

to set the parameters as follows:

C071 (Communication Speed
Selection): 05 (9600bps)

03: 2400bps 07: 38.4kbps
04: 4800bps 08: 57.6kbps
05: 9600bps 09: 76.8kbp
06: 19.2kbps 10: 115.2kbps

7．Serial Communications Connection Procedure

Press the Increment Key or

the Decrement Key to display
C071 parameter.

c071

05

Press the Enter Key.

C071 parameter is displayed.

Press the Enter Key.

default value ''05''.
*If the setting is different, change the

set value.

C071parameter is displayed again.

Use the procedure on the right

5

to set the parameters as follows:

C072 (Communication Station
No. Selection): 1.

Slave address: 1.

Setting range 1. to 247.

Press the Increment Key.

c072

Press the Enter Key.

1.

Press the Enter Key.

C072 parameter is displayed.

default value ''1.''.
*If the setting is different, change the

C072 parameter is displayed again.

set value.

15

Use the procedure on the right

c072

c074

7

c074

c075

Check that the displayed value is the

set value.

Check that the displayed value is the

set value.

6

to set the parameters as follows:

C074 (Communication Parity
Selection): 00 (No parity)

00: No parity
01: Even parity
02: Odd parity

7．Serial Communications Connection Procedure

Press the Increment Key.

C074 parameter is displayed.

c074

Press the Enter Key.

default value ''00''.

00

Press the Enter Key.

*If the setting is different, change the

C074 parameter is displayed again.

Use the procedure on the right
to set the parameters as follows:

C075 (Communication Stop
Bit Selection): 01 (1 bit)

01: 1 bit
02: 2 bits

Press the Increment Key.

c075

Press the Enter Key.

01

Press the Enter Key.

C075 parameter is displayed.

default value ''01''.
*If the setting is different, change the

C075 parameter is displayed again.