Allen-Bradley 42SMU-7201 Photoswitch Polarized Retro Sensor

Allen-Bradley 42SMU-7201 Photoswitch Polarized Retro Sensor is a Series 7000 polarized retroreflective photoelectric sensor that uses a visible red light source and delivers a PNP (source) output. The standard 42SMU-7201 ships with a 3 m (9.8 ft) cable and a 4-pin DC Micro connector, while the 42SMU-7201-QD variant provides a four-pin quick-disconnect connection for easier field wiring. It is designed to detect retroreflective targets with polarization helping to reject ambient light, making it suitable for monitoring reflective labels, marks, or features on conveyorized parts and packaging lines. This model is documented in Rockwell Automation’s PHOTOSWITCH 7000 series literature as polarized retroreflective with visible red emission, and current catalogs note the 42SMU-7201 family as discontinued.