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    What are the supported Modbus Function Codes for a M221 controller?

    This table lists the function codes supported by both serial Modbus and Modbus TCP and their effect on controller memory variables:
    Supported Modbus
    Function Code
    Supported Sub-
    Function Code
    1 (0x01)           - Read multiple internal bits %M
    2 (0x02)           - Read multiple internal bits %M
    3 (0x03)           - Read multiple internal registers %MW
    4 (0x04)           - Read multiple internal registers %MW
    5 (0x05)           - Force single internal bit %M
    6 (0x06)           - Write single internal register %MW
    8 (0x08) 0 (0x00), 10
    (0x0A)...18 (0x12)
    15 (0x0F)           - Write multiple internal bits %M
    16 (0x10)           - Write multiple internal registers %MW
    23 (0x17)           - Read/write multiple internal registers %MW
    43 (0x2B) 14 (0x0E) Read device identification (regular service)
    Note: For function code 5 and 6 you must use the EXCH function. These two function codes are not available with the WRITE_VAR function block

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