Omron CJ Series Instruction Manual

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OTHER SYMBOLS:
3G3AX-MX2-EIO15-E
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CJ Series
General-purpose Serial
Connection Guide
(RS-485 Modbus Communication)
P641-E1-01
OMRON Corporation
Multi-function Compact Inverter
(3G3MX2 Series Type V1)

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 the 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 system 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.
The table below lists the manuals related to this document.
Cat. No. Model Manual name
W472 CJ2H-CPU6[]-EIP
CJ2H-CPU6[]
CJ2M-CPU[][]
CJ Series
CJ2 CPU Unit Hardware USER’S MANUAL
W473 CJ2H-CPU6[]-EIP
CJ2H-CPU6[]
CJ2M-CPU[][]
CJ Series
CJ2 CPU Unit Software USER’S MANUAL
W336 CJ1W-SCU[]1-V1
CJ1W-SCU[]2 CJ Series Serial Communications Units
OPERATION MANUAL
W446 - CX-Programmer OPERATION MANUAL
W342 CJ2[]-CPU[][] CJ Series
Communications Commands
REFERENCE MANUAL
W474 CJ2[]-CPU[][] CJ Series
Programmable Controllers
INSTRUCTIONS REFERENCE MANUAL
I585 3G3MX2-A[][][][]-V1 Multi-function Compact Inverter
MX2 Series Type V1 User’s Manual

2
．
Terms and Definitions
2
2. Terms and Definitions
Term Explanation and Definition
Serial Gateway
mode This is a function of PLC that performs serial communications 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.

3
．
Precautions
3
3. Precautions
(1) Understand the specifications of devices which are used in the system. Allow some
margin for ratings and performance. Provide safety measures, such as installing safety
circuit, in order to ensure safety and minimize risks of abnormal occurrence.
(2) To ensure system 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 Corporation.
(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 document.
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury or property damage.
Precautions for Safe Use
Precautions on what to do and what not to do to ensure safe usage of the product.
Precautions for Correct Use
Precautions on what to do and what not to do to ensure proper operation and performance.
Additional Information
Additional information to read as required.
This information is provided to increase understanding or make operation easier.
Symbol
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 indicates operations that you must do.
The specific operation is shown in the circle and explained in text.
This example shows a general precaution for something that must do.

4
．
Overview
4
4. Overview
This document describes the procedures for 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 to as PLC) of OMRON using serial
communications as well as the procedures for checking their connections.
Refer to Section 6. Serial Communications Settings 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-Programmer 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''
PLC
Serial communications
(RS-485)
Inverter
Sending the command data Executing the command
Receiving the response data
and storing in memory Returning the response data
Prepare a latest CX-Programmer project file beforehand. To obtain a project file, contact your
OMRON representative.
Name File name Version
CX-Programmer project file
(extension: cxp) OMRON_3G3MX2-V1_Mod485_EV100.cxp Ver.1.00
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 check if the
connection was properly established and is not designed to be constantly used
at a site. Therefore, functionality and performances are not sufficiently taken
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.
Command data
Response data

5
．
Applicable Devices and Device Configuration
5
5. Applicable Devices and Device Configuration
5.1. Applicable Devices
The applicable devices are as follows:
Manufacturer Name Model
OMRON
CJ2 CPU Unit
CJ2
□
-CPU[][]
OMRON
Serial Communications Unit
CJ1W-SCU[]1-V1
CJ1W-SCU[]2
OMRON
Inverter
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 the manuals before operating
the devices.
Additional Information
This document describes the procedure to establish 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 procedure. Refer to the manuals or contact
your OMRON representative.

5
．
Applicable Devices and Device Configuration
6
5.2. Device Configuration
The hardware components to reproduce the connection procedures of this document are as
follows:
Manufacturer Name Model Version
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
Prepare a latest project file beforehand.
To obtain a project file, contact your OMRON representative.
Precautions for Correct Use
Update CX-Programmer to the version specified in this clause or higher version.
If you use a version higher than the one specified in this clause, the procedures and related
screenshots described in Section 7. and subsequent sections may not be applicable. In that
case, use the equivalent procedures described in this document by referring to the
CX-Programmer OPERATION MANUAL (Cat. No. W446).
Precautions for Correct Use
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.
Serial cable
(RS-485)
CJ2M-CPU12+
CJ1W-SCU42
Personal computer
(CX-One installed,
OS: Windows 7)
USB cable
3G3MX2
-A2002-
V1

5
．
Applicable Devices and Device Configuration
7
Precautions for Correct Use
The maximum length of communications cable for Inverter is 500m.
Make sure to connect Serial Communications Unit and Inverter with a 500m or less serial
cable (RS-485).
Additional Information
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 Units OPERATION MANUAL (Cat. No. W336).
Additional Information
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 the
USB Driver in Appendices of the CJ-series CJ2 CPU Unit Hardware USER'S MANUAL (Cat.
No. W472).

6
．
Serial Communications Settings
8
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 PLC (Serial Communications Unit) Inverter
Unit number 0 -
Address number
(Slave address)
- 1 (Default)
(C072: Communication Station No.
Selection =1.)
Communications (Connection)
port
Port 1 (RS-422/485) -
Terminating resistor Yes (TERM: ON) No
(Terminating register selector switch OFF)
2-wire or 4-wire 2-wire (WIRE: 2) 2-wire (Fixed)
Serial communications mode Serial Gateway -
Data length
(Transmission character)
8 bits 8 bits (Fixed)
Stop bit 1 bit 1 bit (Default)
(C075: Communication Stop Bit Selection
= 01)
Parity (Parity bit) No No (Default)
(C074: Communication Parity Selection =
00)
Transmission rate (Baud rate) 9,600 bps (Default) 9,600 bps (Default)
(C071: Communication Speed Selection
= 05)
Communication selection - Modbus communication (Default)
(C096: Communication Selection = 00)
Precautions for Correct Use
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 word of CMND instruction used in
the program. Refer to Section 9. Program for details.

6
．
Serial Communications Settings
9
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 lines (pin assignments) before wiring.
■Connector configurations and signal lines (pin assignments)
CJ1W-SCU42 Serial Communications Unit applicable connector: Terminal block
Pin No.
Symbol
Signal name
Input/Output
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 pins 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
■Cable/Pin assignments
Serial Communications Unit
(CJ1W-SCU42).
Inverter (3G3MX2-A[][][][]-V1)
RS-422A/
485
interface
Signal
name Pin No. Terminal block Signal name RS-485 interface
RDA- 1 A1 RS-
RDB+ 2 B1 RS+
SDA- 3
SDB+ 4
FG 5
Terminal block Terminal block
Control Circuit Terminal
Terminating resistor

7
．
Serial Communications Connection Procedure
10
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 initialization, 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. Setting up Inverter
Set up Inverter.
↓
7.2.1. Hardware Settings
Set the hardware switches on Inverter and connect
the cables.
↓
7.2.2. Parameter Settings
Set the parameters for Inverter.
↓
7.3. Setting up PLC
Set up PLC.
↓
7.3.1. Hardware Settings
Set the hardware switches on Serial Communications
Unit and connect the cables.
↓
7.3.2. Opening the Project File and
Connecting Online with PLC
Start CX-Programmer, open the project file, and
connect online with PLC.
↓
7.3.3. Creating the I/O Table
Create the I/O table for PLC.
↓
7.3.4. Parameter Settings
Set the parameters for Serial Communications Unit.
↓
7.3.5. Transferring the Project Data
Transfer the project data to PLC.
↓
7.4. Checking the Serial
Communications
Start the send/receive processing and check that
serial communications are normally performed.
↓
7.4.1. Checking the Receive Data
Check that the correct data is written to the I/O
memory of PLC by using CX-Programmer.

7
．
Serial Communications Connection Procedure
11
7.2. Setting up Inverter
Set up Inverter.
7.2.1. Hardware Settings
Set the hardware switches on Inverter and connect the cables.
Precautions for Correct Use
Make sure that the power supply is OFF when you perform the setting up.
1
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
following procedure.
2
Remove Option Unit Cover from
the Inverter front panel as
shown in the right figure.
1: Loosen the mounting screw (x 1) from Option Unit Cover of the Inverter
front panel.
2: Remove Option Unit Cover.
3
Check that Terminating Resistor
Selector Switch inside of the
terminal block cover is OFF.
4
Connect a Serial cable to
RS-485 terminal (RS-, RS+).
Connect Terminating resistor
(120Ω 1/2W) to RS-485 terminal
(RS-, RS+).
RS-485 terminal
Terminating resistor
Option Unit Cover
Mounting screw
Control Circuit
Terminal Block A
Control Circuit
Terminal Block B
SDB+
SDA-
Serial cable

7
．
Serial Communications Connection Procedure
12
5
Connect 3-Phase 200 VAC
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.
No. I585).
6
Mount Option Unit Cover on the
Inverter front panel.
Main power supply input
terminal
3-Phase 200 VAC
power supply
Power supply
cable

7
．
Serial Communications Connection Procedure
13
7.2.2. Parameter Settings
Set the parameters for Inverter.
1
Check the positions of Data
display and Operation keys on
Digital Operator.
Digital Operator
2
Turn ON the power supply to
Inverter.
3
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
output frequency.
0.00
Press the Mode Key 5 times.
c001
Data display
Operation keys
C001 parameter is displayed.
The output frequency is displayed in
Data display.

7
．
Serial Communications Connection Procedure
14
4
Use the procedure on the right
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
c001
Press the Increment Key or
the Decrement Key to display
C071 parameter.
c071
Press the Enter Key.
05
Press the Enter Key.
c071
5
Use the procedure on the right
to set the parameters as follows:
C072 (Communication Station
No. Selection): 1.
Slave address: 1.
Setting range 1. to 247.
c071
Press the Increment Key.
c072
Press the Enter Key.
1.
Press the Enter Key.
c072
C071 parameter is displayed.
Check that the displayed value is the
default value ''05''.
*If the setting is different, change the
set value.
C071parameter is displayed again.
C072 parameter is displayed.
Check that the displayed value is the
default value ''1.''.
*If the setting is different, change the
set value.
C072 parameter is displayed again.

7
．
Serial Communications Connection Procedure
15
6
Use the procedure on the right
to set the parameters as follows:
C074 (Communication Parity
Selection): 00 (No parity)
00: No parity
01: Even parity
02: Odd parity
c072
Press the Increment Key.
c074
Press the Enter Key.
00
Press the Enter Key.
c074
7
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
c074
Press the Increment Key.
c075
Press the Enter Key.
01
Press the Enter Key.
c075
C074 parameter is displayed.
Check that the displayed value is the
default value ''00''.
*If the setting is different, change the
set value.
C074 parameter is displayed again.
C075 parameter is displayed.
Check that the displayed value is the
default value ''01''.
*If the setting is different, change the
set value.
C075 parameter is displayed again.