IGV of a compressor is controlled by local PLC(Allen Bradley CompactLogix) and the PLC has its own calculation which takes into account output from DCS (DeltaV).
As there is certain calculation in the PLC, there are offset between DCS and PLC outputs. This output offset sometimes causes overshooting as DCS thinks the output outside didn't reach 100% while output in PLC is sitting at 100%.
There is IGV position feedback available in DCS.
Is there any configuration of DCS which can remove the offset between the DCS and PLC?
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I wanted to disconnect the dotted line from AO1 to BKCAL_IN1 of PID1 and reconnect FY-703B.OUT from PLC to the BKCAL_IN.