SN04-P PNP Inductive Proximity Sensor Switch - DC 10-30V, 5mm Range, 150cm Cable

The SN04-P features a PNP (sourcing) output. In a PNP sensor, the signal wire (black) switches to a positive voltage (matching the supply) when a target is detected, providing a 'high' signal to the PLC input. This contrasts with NPN (sinking) outputs, which switch the signal to ground. PNP sensors are commonly used in systems where the PLC input module is designed to receive a sourcing signal.

This sensor is designed to detect ferrous metals, such as steel and iron. The sensing distance is calibrated for standard mild steel. Non-ferrous metals like aluminum, copper, or brass will have a significantly reduced effective sensing range, typically 30-50% of the nominal 5mm distance, and may not be reliably detected in all applications.

Connect the brown wire to your system's positive supply (10-30V DC), the blue wire to ground (0V), and the black signal wire to your microcontroller's digital input pin. Since the PNP output can provide up to the supply voltage, you must use a voltage divider or an opto-isolator module to step the signal down to a safe 5V or 3.3V level for the microcontroller's input pin to prevent damage.

IP67 signifies a high degree of environmental protection. The '6' indicates complete protection against dust ingress. The '7' means the sensor can withstand immersion in water up to 1 meter deep for 30 minutes. This makes the SN04-P suitable for washdown areas, outdoor use, and environments with oil mist or heavy dust.