Types of PLC Input Sources: SINK and SOURCE and Their Wiring Methods
1. Overview The digital input interface of a PLC is not complex. To enhance anti-interference capability, PLCs use optocouplers to isolate the input signals from the internal processing circuits. Therefore, the signal at the input end only needs to drive the internal LED of the optocoupler to turn on, and the phototransistor of the optocoupler … Read more
