Sick W12-3 I/O-Link Photoelectric Sensors. SICK W12-3 photoelectric sensors with I/O-Link. The W12-3 series offers clear advantages over conventional optical sensors in respect of object detection and sensor monitoring. I/O-Link is the new communication standard for the integration of the sensors and actuators into automation systems. W12-3 I/O-Link can be parametrised and monitored via field bus. Preventative maintenance and service measures can be implemented and changeover times for product or format changes can be significantly reduced. Features and Benefits. Reliable object detection Integration into high speed processes Precise and fast switching Diverse target sensing; from dark to transparent Sensor adapts to the machine design Dovetail mounting Plug rotatable through 270° High EMC resistance IP 69K