I've got 2 pressure signals coming from the field to a honeywell PLC and from there to ABB DCS. If i'm injecting 4-20mA from ABB marshalling cabinet or from the honeywell PLC cabinet i'm able to get correct value reading in the HMI of ABB. but when the loop is powered (when actual transmitter is sending 4-20mA) i'm not able to get correct values in HMI, one signal is showing over range and other one under range in the HMI while 4 mA is coming. How to solve this issue ??? pls give suggessions....