PROTOCOL MACRO SETTING FOR CJ1W-SCU41 AS MODBUS MASTER

This time ill show you how to make your SCU41 module can do as modbus master to connected with various RTU device like Power Meter, remote I/O etc.

Before this article was write, i spent so many day to learning how to connected the SCU with a Power Meter I had. There are no people to asking. Just “Mbah Google” and PLC forum could help my problem.

And now It was clear and I have done with the problem. This my time to share about it.

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DOWNLOAD AND CUSTOM SETTING TO YOUR PLC

Now you must download a file that came from a forum website say mrplc.com. You have to sign up and download this file: EASY To USE RTU MASTER FOR CP1L CP1H CJ1 CJ2 CS1. Note: This file only support for OMRON CPU mention above.

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After you download the File, Open it. CX-Programmer will show you the ladder looks like below:

The picture beside tell you that the default ladder suitable with 4 style module:

a. CJ1/CJ2/CS1 For Single Port b. CP1H / CP1L For Single Port c. CJ1 / CJ2 / CS1 for Dual Port d. CP1H / CP1L for Dual Port.

In this article, I use the module CJ1W-SCU41 with feature Single Port for RS485 port, and the CPU of PLC was using CJ2M-CPU31.

It means you have to use the number 1 and must delete another number ( 2, 3,4 ) look like below:

After you choose the type of your PLC and your port module, it will be looks like below in your windows:

The Next step is you must change the type of your CPU. The picture above said the ladder only for CJ1 CJ2 CS1 but now you must make it special setting to your type of PLC ( in this article are using CJ2M-CPU31 ).

Do change your type of CPU looks like below:

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After you change the type of your PLC, now you setup the communication setting of the SCU module. Do online with your PLC by using USB connection.

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Please change your PLC name for easy settings. Choose the PLC tab> Edit > Information and change the current name of your PLC with new one. Example: YOHAN.

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SET YOUR PORT

Now you must change and set for Port #1 of the SCU’s module. Please go to I/O table and click the SCU41 module. The setting should be like below:

• Displayed Parameter: Port1: Protocol Macro Settings
• Port1: Port Settings: User Settings
• Port1: Serial Communication mode: Protocol Macro
• Port1: Data Lenght: 8 bit
• Port1: Stop bits: 1 bit
• Port1: Parity: None
• Port1: Baud Rate: Default ( 9600 bit per second )
• Port1: Maximum number of bytes in protocol: 1000 Byte

Dont forget to download these settings to PLC. After download has done, Now do set the Protocol Macro of the PLC by running an CX PROTOCOL in your Workstation or laptop.

SET PROTOCOL USING CX-PROTOCOL

Run CX Protocol start with> OMRON> CX One> CX Protocol.

Open your downloaded files from the link.

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After you open the file with extention *.psw, please delete port number 2 . Remove Modbus Application port 2. Then you must setup the type of your PLC. But the first , you must edit the communications settings between PC and PLC. Just right click the PLC and edit as your PLC settings.

Change the type PLC in the example file with your PLC. In this article said that your PLC are CJ2M with CPU number 31. Connection are in USB.

After you change the PLC settings with the real PLC, now you must online with PLC to connect and then to download your communications settings.

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After you Download the hardware settings, you must set the protocol settings too.

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Now your PLC has a protocol macro programed inside.

NEXT : REGISTERING MODBUS ADDRESS OF THE EQUIPMENT OUTSIDE.