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npn vs pnp sensors

1 article tagged “npn vs pnp sensors”.

Flat vector wiring diagram comparing NPN and PNP sensor connections to a PLC digital input module showing current flow direction for each type
npn vs pnp sensorssensor wiringplc inputs

NPN vs PNP Sensors: Wiring and PLC Connection

NPN and PNP sensors switch current in opposite directions. Get the wrong one for your PLC input card and the signal never works. Here is how to tell them apart and wire each type correctly.

Aug 5, 2026 · 8 min read

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