Wiring 2 — NPN / PNP (Sinking & Sourcing)

Briefing

PNP and NPN describe which transistor type drives the signal output. **PNP (sourcing):** the output goes HIGH (+24 V) when the sensor detects. **NPN (sinking):** the output goes LOW (0 V) when the sensor detects. Your inductive proximity sensor is **PNP**. It has three wires: - **BN (Brown)** — supply +24 V - **BU (Blue)** — supply 0 V - **BK (Black)** — signal output (PNP → connects to PLC input) Wire it correctly to the PLC input card.

Objectives

• Wire BN (Brown) to the +24 V supply
• Wire BU (Blue) to the 0 V common
• Wire BK (Black) signal to PLC input %I0.0

I/O Table