Allen-Bradley 42SPI-4000 Photoelectric Sensor

Allen-Bradley 42SPI-4000 PhotoSwitch Photoelectric Sensor is a PHOTOSWITCH device from Rockwell Automation that provides non-contact object detection in industrial environments. This sensor uses light to detect the presence or absence of objects, enabling automated control decisions in manufacturing, packaging, and materials handling lines. As part of the PHOTOSWITCH family, the 42SPI-4000 is designed for reliable operation in settings where physical contact is undesirable, offering consistent sensing performance across a range of target materials and colors. The model name places it in Allen-Bradley’s line of 42-series compact sensors, configured for integration with Rockwell control ecosystems and standard sensor cabling. Common use cases include detecting stock at conveyors, ensuring parts are present before a downstream operation, or triggering downstream equipment based on object passage. Specific electrical ratings, mounting options, and output configurations vary by exact variant, so consult the official Rockwell Automation documentation or an authorized distributor listing for the precise specifications and connection type for your installation.