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Can we move holding registers to input registers in Unity Pro.

Yes , we can use "WRITE_INPUT_INT"  EF for moving holding registers to input registers but considered the 3X register should not be mapped on IO module or somewhere in configuration to avoid any conflict .

Restrictions with WRITE_INPUT_INT: 
  • The function block provides access to one variable at a time (elementary data types and not arrays of elementary data types). 
  • Only variable addresses are allowed, you cannot use declared variables even if they are mapped on a %IW direct address. 
  • The simulation block WRITE_INPUT_INT does not work if the I/O module is configured in a RIO rack but works properly if the I/O module is configured in a local or DIO rack. 
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