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sensor wiring

2 articles tagged “sensor wiring”.

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

PNP and NPN 3-wire sensor wiring diagram to PLC input terminals
sensor wiringplc inputspnp npn

3-Wire Sensor Wiring: PNP vs NPN to PLC Inputs

PNP or NPN sensor, sinking or sourcing input? Learn exactly how to wire 3-wire sensors to any PLC input card with real wiring rules and common mistakes.

Jul 1, 2026 · 9 min read

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