Applies To:
  • CitectSCADA 5.31, 5.40, 5.41, 5.42, 5.50, 6.0, 6.1, 7.0
  • CitectHMI 5.31, 5.40, 5.41, 5.42, 5.50, 6.0, 6.1, 7.0
  • CitectFacilities 5.31, 5.40, 5.41, 5.42, 5.50, 6.0, 6.1, 7.0
Summary:

What is the difference between all the variants of the MODBUS/MODNET driver? 

Solution:

From the driver help:

MODNET   -  1-indexed registers/coils with bit access to registers as 1-16.
                  No support for extended registers.
                  Maximum request size of 2000 bits.

MODNET0  -  1-indexed registers/coils with bit access to registers as 1-16.
                  No support for extended registers.
                  Maximum request size of 2000 bits.              

MODNET1  -  0-indexed registers/coils with bit access to registers as 1-16.
                  No support for extended registers.
                  Maximum request size of 2000 bits.

MODNET2  -  1-indexed registers/coils with bit access to registers as 0-15.
                  No support for extended registers.
                  Maximum request size of 2000 bits.

MODNET3  -  0-indexed registers/coils with bit access to registers as 0-15.
                  No support for extended registers.
                  Maximum request size of 2000 bits.

MODNET10 - 1-indexed registers/coils with bit access to registers as 1-16.
                  Support for extended registers.
                  Maximum request size of 1920 bits.

MODNET11 - 0-indexed registers/coils with bit access to registers as 1-16.
                  Support for extended registers.
                  Maximum request size of 1920 bits.

MODNET12 - 1-indexed registers/coils with bit access to registers as 0-15.
                  Support for extended registers.
                  Maximum request size of 1920 bits.

MODNET13 - 0-indexed registers/coils with bit access to registers as 0-15.
                  Support for extended registers.
                  Maximum request size of 1920 bits.

MODNET20 - TSX Quantum Compatability Mode.
                  1-indexed registers/coils with bit access to registers as 0-15.
                  Support for extended registers.
                  Maximum request size of 1920 bits.
                  Forced parameter: RegisterBitReverse=1, FloatMode=0, LongDataType=3

MODNET21 - TSX Quantum Compatability Mode. (superseded by MODNET20)
                  1-indexed registers/coils with bit access to registers as 0-15.
                  No support for extended registers.
                  Maximum request size of 2000 bits.
                  Addressing syntax %M123, %MW123, %MW123.4 etc...
                  Forced parameter: RegisterBitReverse=1, FloatMode=0, LongDataType=3

MODNET30 - TSX Premium Compatability Mode.
                  0-indexed registers/coils with bit access to registers as 0-15.
                  No support for extended registers.
                  Maximum request size of 1024 bits.
                  Forced parameter: RegisterBitReverse=1, FloatMode=0, LongDataType=3

MODNET31 - TSX Premium Compatability Mode. (superseded by MODNET30)
                  0-indexed registers/coils with bit access to registers as 0-15.
                  No support for extended registers.
                  Maximum request size of 1024 bits.
                  Addressing syntax %M123, %MW123, %MW123.4 etc...
                  Forced parameter: RegisterBitReverse=1, FloatMode=0, LongDataType=3 
Keywords:
 

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