Invalid Modbus Value

What does 3 mean?

The Modbus request included a bit or word value that is outside the permissible range or format for the specified address in the slave device. This indicates the data being written is unacceptable for that particular register. Writing invalid values can cause unexpected behavior, misconfiguration, or failure of the slave device to operate correctly.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check for data type mismatches or endianness issues between the master and slave.