A 4-wire transmitter has 2 wires connected to a power supply, and 2 signal wires connected to the PLC.
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Wiring of 2 Wire & 4 Wire transmitters of DCS\PLC in Analog Input! Electrical & Automation
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The power supply can be AC or DC depending upon the vendor and model.
In a 2-wire current loop, the transmitter, DC power supply, and PLC are connected in series. Not only are the 2 wires providing power for the transmitter, but they are also the signal lines!
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