4-20mA signals can be used to make analog measurements such as tank levels, pH, pressure, speed, etc, yet 4-20mA 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 4-20mA analog signal.

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Items used in this video:
PLC Trainer https://twcontrols.com/plc-trainers
PLC Tools SIM-ALP2 https://plctools.com/plc-tools-sim-al...

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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 4-20mA Wiring
00:37:09 2 Wire 4-20mA Wiring
00:44:44 y=mx+b Explained
00:54:40 Scaling 4-20mA in Ladder
00:58:45 DINT vs REAL in Compute Results
01:06:12 Measuring 4-20mA signals
01:24:08 Programming 4-20mA Level to Run Pump
02:05:32 Programming 4-20mA to Heat and Cool
02:19:21 Scaling 4-20mA in Function Block
02:31:30 Scaling 4-20mA in Structured Text
02:38:48 4-20mA Function Block Heat and Cool Programming
02:52:40 4-20mA Structured Text Heat and Cool Programming