Local data of the MODBUS client

The address of the area from which data are to be read or to which data are to be written is specified in the Function Block ETHx_MOD_MAST: ETHx_MOD_MASTModTcpMast at input “Data”, via the ADR operator.

For the AC500, the following areas can be accessed using the ADR operator:

• Inputs area (%I area)
• Outputs area (%Q area)
• Area of non-buffered variables (VAR .. END_VAR or VAR_GLOBAL END_VAR)
• Addressable flag area (also protected areas for %M area)
• Area of buffered variables (VAR RETAIN .. END_VAR or VAR_GLOBAL RETAIN .. END_VAR)