4-Wire Slot Type Photoelectric Switch

DFRobot 4-Wire Slot Type Photoelectric Switch is a compact optical detection component designed for precise object sensing in automation and motion systems. An integrated optical transmitter and receiver create a stable light barrier across a 5mm slot, enabling reliable detection when objects interrupt the beam. Operating from a wide 10–30V DC supply, this industrial-grade slot sensor offers strong anti-interference capability and fast response suitable for high-speed detection tasks. A built-in indicator provides real-time working status feedback, while the compact housing simplifies integration into machinery, robotics mechanisms, material counting setups, and automated control equipment.

Figure: Product dimensions

Stable Optical Slot Detection

This slot-type photoelectric sensing module integrates an optical transceiver pair within a 5mm gap to form a precise light-interruption detection zone. When objects pass through the slot and block the beam, the sensor immediately triggers a switching output. Strong resistance to electrical noise improves reliability in industrial environments, while a fast response time under 1.5ms and a switching frequency up to 500Hz enable accurate monitoring of rapidly moving parts, thin materials, or small mechanical components.

Dual Output Modes for Flexible Integration

A 4‑wire PNP output architecture provides both normally open and normally closed signal outputs simultaneously. Brown and blue wires supply power, while black and white lines provide switching outputs that allow flexible control logic integration. This configuration simplifies connection to controllers, PLC systems, automation circuits, and counting devices without requiring additional signal inversion hardware. Onboard indicator feedback helps confirm operating status during installation and maintenance.

Industrial Protection and Reliable Operation

This compact optical detection unit incorporates multiple electrical protection mechanisms to improve durability in real-world systems. Built‑in safeguards include short-circuit protection, overload protection, and reverse polarity protection, reducing the risk of damage caused by wiring errors or abnormal loads. An IP50 protection level and durable enclosure design allow stable operation in equipment housings, mechanical assemblies, and factory automation environments where dependable switching performance is essential.

Common uses for this slot photoelectric sensing module include material counting, transparent object detection, edge positioning, and motion monitoring in automated systems. The compact optical switch is suitable for robotics mechanisms, conveyor equipment, packaging machines, and small electromechanical devices where reliable beam-interruption sensing is required for precise control or event triggering.