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I am working at a pump station trying to get it going, I am a civil engineer not electrical so here's my question - The PLC guy is taking all the analog signals, take for example a pressure transmitter (0 to 150 psi range) and in his program uses some 0 to 4095 range to display the signal where as the telemetry guy uses 819 to 4095 to figure his signal so when the PLC get zero pressure he gets 0 but when the RTU gets zero pressure he gets 819 in some field in his program. Anyway you can see where this could lead to a problem if the signal goes to the RTU first and then the PLC or vice versa. SCADA reads everthing from the RTU whereas the HMI at the site take everything from the PLC and things are not matching up. Someone gotta give but who's right? Where did they come up with 819 to 4095? That's my main question. Any help is appreciated. Thanks [email protected]