Generic E3F-DS30C4 Photoelectric Sensor, NPN NO, DC 6-36V, 30 cm Detection

The E3F-DS30C4 has an NPN (sinking) output. This means the output transistor switches the signal wire to ground (0V) when activated. It is typically connected to a PLC input module that provides a positive voltage source. A PNP (sourcing) output would switch the positive voltage instead. Always verify your controller's input type (sink or source) for compatibility.

The NPN open-collector output of this sensor can switch a maximum load current of 200 mA. This is sufficient to directly drive small relays, PLC digital inputs, or indicator lamps. Ensure the total load connected does not exceed this rating to prevent damage to the sensor's output transistor.

As a diffuse reflective sensor, detection of transparent objects (like glass) or highly reflective surfaces can be unreliable because they may not scatter enough light back to the receiver. For such applications, a through-beam sensor (separate emitter and receiver) or a polarized retro-reflective sensor is a more suitable choice.

For a 5V system like Arduino: Connect the sensor's brown wire to 5-36V DC+, blue wire to GND, and black (output) wire to your digital input pin. You will need a pull-up resistor (e.g., 10kΩ) between the black wire and 5V, as the NPN output can only pull the line low. The input pin will read LOW when an object is detected.