420mA signals can be used to make analog measurements such as tank levels, pH, pressure, speed, etc, yet 420mA current loop transmitters are one of the most misunderstood control signals when it comes to wiring and analog scaling. We are going to discuss how to wire 2 wire current loops, 4 wire current sources, how to determine your PLC's analog input raw scaling, how to convert it into engineering units, and how to troubleshoot a 420mA analog signal.

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PLC Trainer https://twcontrols.com/plctrainers
PLC Tools SIMALP2 https://plctools.com/plctoolssimal...

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00:00:00 Introduction
00:10:08 Difference Between Analog and Discrete Inputs and Outputs
00:15:36 Studio 5000 Analog Configuration
00:21:13 2 Wire Current Loop vs 4 Wire Current Source
00:27:58 4 Wire 420mA Wiring
00:37:09 2 Wire 420mA Wiring
00:44:44 y=mx+b Explained
00:54:40 Scaling 420mA in Ladder
00:58:45 DINT vs REAL in Compute Results
01:06:12 Measuring 420mA signals
01:24:08 Programming 420mA Level to Run Pump
02:05:32 Programming 420mA to Heat and Cool
02:19:21 Scaling 420mA in Function Block
02:31:30 Scaling 420mA in Structured Text
02:38:48 420mA Function Block Heat and Cool Programming
02:52:40 420mA Structured Text Heat and Cool Programming