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Remote terminal unit
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===Digital (control relay) outputs=== RTUs may drive high current capacity relays to a digital output (or "DO") board to switch power on and off to devices in the field. The DO board switches voltage to the coil in the relay, which closes the high current contacts, which completes the power circuit to the device. RTU outputs may also consist of driving a sensitive logic input on an electronic [[Programmable logic controller|PLC]], or other electronic device using a sensitive 5 V input.
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