Hi,
I have:
Omron PLC CJ1M CPU13 and
Omron SYSDRIVE 3G3JV inverter.
I want to establish communication between PLC and inverter with Modbus protocol. So that PLC sent reference speed to inverter and receive frequency and current from inverter. I think that I need serial communication unit in PLC and also serial communication unit on inverter and wire these two devices with RS422A/485, I'm not sure what else I need?
Please any help or advice!
Thanks!