3. Communication application note
3.1 Modbus communication protocol
The embedded PLC supports Modbus RTU and Modbus ASCII protocol for communication to read and
write software devices.
Modbus address of bit soft device is divided into group address and address. The operation of the group
address is to read and write 16-bit soft devices at the same time. Up to 416 address operations can be
read and written at a time. Word soft devices have only group addresses, and up to 20 read and write at
a time. When writing parameter D during communication, ensure that the inverter is in communication
mode.
PLC soft device Modbus communication address
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