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    Which driver should be used for a Proface HMI communication with a Modbus master via Modbus TCP?

    A Modbus Slave driver from the manufacturer of Schneider Electric SA needs to be created and configured from GP-Pro Ex. After the driver being created, you can see device addresses from the address window. These addresses can be used for the Modbus Master to read/write values from/to the Pro-face HMI which is Modbus Slave. From the driver settings, you can check IEC61131 syntax to use IEC61131 grammar for variables. Please check the following corresponding table for Modbus and IEC61131 syntax address descriptions:
    Device MODBUS Syntax IEC61131 Syntax
    Format Range First element Format 0-based 1-based
    Range First element Range First element
    Coil 000001+ i i = 0 to 8191 000001 %Mi i = 0 to 8191 %M00000 i = 1 to 8192 %M00001
    Discrete Input 100001+ i i = 0 to 8191 100001          
    Input Register (Word) 300001+ i i = 0 to 9999 300001          
    Input Register (Word bit) 300001+ i, j i = 0 to 9999 j = 0 to 15 300001,0 0          
    Holding Register (Word) 400001+ i i = 0 to 9999 400001 %MWi i = 0 to 9999 %MW00000 i = 1 to 10000 %MW00001
    Holding Register (Word bit) 400001+ i, j i = 0 to 9999 j = 0 to 15 400001,0 0 %MWi: Xj i = 0 to 9999 j = 0 to 15 %MW00000 :X00 i = 1 to 10000 j = 0 to 15 %MW00001 :X00

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