In the case of a programmable logic controller (PLC) digital output card, the card turns on an LED inside the card, which switches on the field current using a phototransistor. For a PLC digital input ...
The answer is B, “+24 VDC.” A sinking digital input on a PLC I/O card is looking for positive 24 VDC at the input terminal. This configuration is most commonly used because +24 VDC at the digital ...
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