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Dear Gentlemen, I'm rather new to Unitronics. Worked with Vision 230 couple of months on some simple control system. Now am working with Jazz-10-UA24Z. Making constant pressure boosting pump set control system. 2 pumps in parallel configuration which run on vfds, Feedback from a pressure transducer on the discharge manifold as PV, input. Analogue out from plc to vfds as speed reference, paralleled. I've got the pid part sorted out. Can anyone assist on 1. How to incorporate the cascading function to the program? Thanks, Moorthy.