The Siemens 3RG7401-7CH00 is a SIMATIC PXO320 K20 retro reflective sensor with a built-in polarization filter, sized 31x20x12 mm. It runs on 10-30 VDC, has a sensing range of 0.1-2.5 m, and outputs PNP at 100 mA through an M8 4-pole connector. Light-on or dark-on is programmable on the fly. IP67 rating means it handles washdown environments without a second thought.
The 0.1-2.5 m range with a polarization filter means this sensor rejects false triggers from shiny targets — it's the right pick for detecting reflective objects like polished metal or clear packaging on a conveyor. The 10-30 VDC supply and PNP output match standard PLC inputs; the 100 mA load capacity drives a small relay or PLC input directly. M8 4-pole connector keeps wiring clean on a compact machine frame.