Modbus Exception: Unsupported Function Code

What does 01 hex mean?

This Modbus exception indicates that the master device has sent a function code that the inverter (slave) does not recognize or support. It means the Modbus request is invalid because it's asking the inverter to perform an operation it's not designed for, preventing the command from being executed.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Consult the inverter's Modbus communication protocol section (8-5) in the manual for a list of valid function codes.