The Siemens 3RG7642-0AA00 is a SIMATIC PXO230 M18S thru-beam sensor receiver, straight optics, in a M18×52 housing. It runs on 10-30V DC, outputs PNP dark-on at 150mA, and has a sensing range of 6m. The cable is 2m PUR, 3×0.34mm², with IP67 protection.
The 6m sensing range is the maximum specified distance between emitter and receiver for reliable detection. The PNP dark-on output means the load is switched on when the light beam is blocked — typical for presence detection in industrial automation. IP67 lets it handle washdown and dust without a secondary enclosure.