A Guide to Identifying and Using PNP Sens…. The wiring diagram of a proximity sensor showing the direction of the current flow out of the sensor, indicating the PNP polarity. If a device sends current out, we call it ‘sourcing’. Therefore a PNP sensor is also called a ‘sourcing’ sensor. This is easy to remember because the sensor is the source of the current.
A Way to Remember NPN and PNP Sensor Wiring. To easily.
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