Hi, please send more details.
The communication error could be due to many things - wrong cable connection, wrong port settings, wrong communication settings, wrong communication driver, wrong addresses e.t.c.
I have configured the node id and protocol type in panel builder 600
And configured initialization block in ac1131 program (modinit) with parameters as pb600
Cable was fabricated due to pin assignment of the HMI and the controller
Are there any otherthings to check or to configure
Unfortunately I never worked with AC31 series 90, so could not give you any recommendation for it. For CP600 I could recommend to set is as Modbus RTU Master, and try to read MW0.0 from the controller - only one register in the beginning - the first one. It almost always exists, so you will check if the line and COM settings are OK
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