Good friend how to program in the Onrom clp with the COMPARE and MOVE function, alternation of 3 pumps and in case of any defect the other two take turns? GratefulOkay, I think you must be working on a real-life problem, so here is my version of a relay-logic sequencer (no PLC) for 3 pumps with 1 standby, with the standby pump selected manaully OR by when 1 pump fails to start.
It could be done with fewer rungs with PLC logic Sequencer instructions.