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I am facing a problem with a 4-20ma control loop. There is a FCV (Flow control valve) which gives (sourcing) 4-20ma signal for its position feedback. This is to be wired to a analog input module of a PLC. The module has 8 no. of isolated channels each having 2 terminals +ve and -ve. There are 24V DC at these two terminals. Now there is a situation that both the transmitter and receiver has 24V DC. How to wire them to get correct current?