AC800M Modbus RTU error code :Undefined Function Code 0
We had modbus link to automation, AC800M is slave (ch 3) and link stops occasionally for this kind of messages. AC800M controller log.
Undefined Function Code 0 in GetPendingByteSize()
Incoming Modbus Request Frame is Corrupted
It had worked previously with AC110.
What could be reason ....
Thank for answers.
Sometimes I had problems with a Modbus serial communication due the parameter "Delay of the RTS-signal" was different of zero.
This parameter is in the editor panel of "<Port number> Com" nodes of the hardware structure of the controllers.
I hope this could help you