Transfering Speed Control on Compressors to DCS


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I'm working on a project to transfer all compressor signals to DCS some of the challenges I found so far are:

1. How to supply Output from DCS to change local set points for compressor engine.

2. How to create control mechanism to automate pressure controlled reset on the compressor engine speed control.

any ideas is very much appreciated.
We are currently using Caterpillar engine speed control for the compressors. Model number is G 3600 series. We need to transfer all this remote control from the caterpillar engine speed control to the DCS. The DCS uses Allen Bradley and Honeywell controllers.