The Omron E3A2-XCM4D is a receiver unit for through-beam photoelectric sensor systems, serving as the detector half of a long-range object detection pair. Working with a separate emitter, it switches its output when the beam is interrupted, using Dark-ON logic to detect objects passing between the units.Its M12 4-pin connector allows quick, tool-free replacement without disturbing hardwired cabling. Although a legacy component, its rugged construction and long sensing range keep it in service on established production lines.Technical Specifications Series E3A2 Unit type Photoelectric sensor receiver (through-beam) Sensing distance 10 m (with matching emitter) Output logic Dark-ON Connection M12 4-pin connector Status Legacy product; sold as replacement stock