This method of testing would not cover the Modbus mapping within the PLC but this testing would be carried out during FAT and test documentation completed.

Не пойму((((

A modbus map is simply a list for an individual slave device that defines
- what the data is (eg. pressure or temperature readings)
- where the data is stored (which tables and data addresses)
- how the data is stored (data types, byte and word ordering)