![]() These loops have the advantages of simplicity and noise immunity, and have a large international user and equipment supplier base. They are also used to transmit controller outputs to the modulating field devices such as control valves. Only one current level can be present at any time.Ī major application of current loops is the industry de facto standard 4–20 mA current loop for process control applications, where they are extensively used to carry signals from process instrumentation to PID controllers, SCADA systems, and programmable logic controllers (PLCs). ![]() In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. For the network analysis variable, see loop current. For the oceanic phenomenon, see Loop Current. ![]() For digital serial communications, see Digital current loop interface. This article is about an analog electrical signaling scheme.
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