kingkumak

RTU Modbus CJ2M CPU34, SCU31-V1,

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Hello everyone. In my project I have to communicate Omron CJ2M-CPU34 PLC with TRANE chiller via Modbus RTU protocol. Unfortunately, I never use this protocol and I have no idea where should I start. I'm looking for examples and advices. If someone has experience in this topic please help me. I attach TRANE chiller documentation. Especially I want to use function 5,6 and 4. 

CGAX-CXAX_Protocole_Datalists.xlsx

CG-SVU007C-GB_0915.pdf

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Never used it, but I think this link can help you:

https://www.myomron.com/index.php?action=kb&article=1243

As I check now on the run, there are some predefined function blocks for modbus  in cx-programmer, go to Help -> Omron FB Library reference, but it seems it's of no use, not sure. But on the above link you have samples, maybe it can help.

regards

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Thank you for help. In 'Downloads' I find "Easy to use Modbus RTU Master' by PMCR. Do you think that solution could work with device which I want to connect to my PLC?

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