2 Operation 2-5 Modbus TCP Server/Slave Command Examples Objective • Read 10 Coils st arting at CIO 100 2.00 through CIO 1 002.09. PLC Dat a for CIO 10 02 = 0000000000110010 (0032 HEX) Additional Information Function Code 02 (Read Input Status) operates the same as above example. Objective Read 4 channels starting at D1050. PLC data for D1050 = 1234, D1051 = 5678, D1052 = 90AB, D1053 = CDEF 2-14 Grid Connect Modbus/TCP Adapter Application and Setup Guide Function Code 01:
Read Coil Status Command Value Command Value Function Code 01 Function Code 01 Starting Address Hi 00 Byte Count 02 Starting Address Lo 02 Coils 0 - 7 32 Number of Coils Hi 00 Coils 8 - 9 00 Number of Coils Lo 0A Function Code 03: Read Holding Registers Command Value Command Value Function Code 03 Function Code 03 Starting Address Hi 00 Byte Count 08 Starting Address Lo 32 Register Hi D1050 12 Number of Registers Hi 00 Register Lo D1050 34 Number of Registers Lo 04 Register Hi D1051 56 Register Lo D1051 78 Register Hi D1052 90 Register Lo D1052 AB Register Hi D1053 CD Register Lo D1053 EF