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sonia

OMRON CJ1W-SCU31-V1 modbus card programming example

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Hi Everyone, I am currently working on a OMRON CJ2M-33CPU PLC that has a CJ1W-SCU31-V1 serial modbus card. The device is configured as a slave and must communicate to an allen bradley Micro850 PLC (master). On the allen bradley side I got some examples and instructions how to send data (write to the OMRON). I am using MSG_MODBUS block. What do I do in the OMRON side to read data coming from the allen bradley PLC? I have already done the configurations: Modbus RTU slave, baud rate etc. just not very sure how to read data from the ladder programming side of my OMRON. Can anyone assist please? Sonia

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Write everything to DM0 up in the Omron if you have set that as the Modbus slave area. Then read holfing registers starting at 0 from the AB. I do this for BMS systems all the time.

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Thank you very much BobB. As I was about to test, I got an error on the Micro850 AB PLC. The program that must write to the OMRON PLC gives me an errorID 21 on the MSG_MODBUS Block: A local channel configuration parameter error exists. Does anyone know what does this mean?

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