Posted 6 Mar 2017 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 Share this post Link to post Share on other sites
Posted 6 Mar 2017 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 Share this post Link to post Share on other sites
Posted 14 Mar 2017 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? Share this post Link to post Share on other sites