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    When using a Unity Premium PLC, what function block would I use for retrieving diagnostic information from a Modbus slave device?


    The SEND_REQ function block is used for retrieving diagnostic and maintenance information from  a Modbus slave device....
     
    Modbus Request
    Function Code / Sub Function Code
    Communication Function
    Exception status
    16#07
    SEND_REQ
    Diagnostics
    16#08/16#xx
    SEND_REQ
    Event counter
    16#0B
    SEND_REQ
    Connection event
    16#0C
    SEND_REQ
    Slave identification
    16#11
    SEND_REQ
     
    The diagnostics and maintenance information are shown below:
    Designation
    Function code / sub-function code
    Read exception status
    16#07
    Echo
    16#08 / 16#00
    Initialize module
    16#08 / 16#01
    Read the diagnostic registers of the PLC
    16#08 / 16#02
    Change end of frame delimiter (ASCII mode)
    16#08 / 16#03
    Switch to listening mode
    16#08 / 16#04
    Reset counters
    16#08 / 16#0A
    Number of messages received without CRC error
    16#08 / 16#0B
    Number of frames received with CRC error
    16#08 / 16#0C
    Number of exceptional responses
    16#08 / 16#0D
    Number of messages addressed to the PLC
    16#08 / 16#0E
    Number of broadcast messages received
    16#08 / 16#0F
    Number of correct responses
    16#08 / 16#10
    Number of messages received in listening mode
    16#08 / 16#11
    Number of invalid characters received
    16#08 / 16#12
    Read event counter
    16#0B
    Read connection event
    16#0C
    Read identification
    16#11



     

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