The Siemens 3RG7650-3CD00 is a SIMATIC PXO210 M18S diffuse sensor with energetic rectangular optics. It operates on 10-30V DC, offers a 500mm sensing range, and outputs PNP light-on logic at up to 150mA. The M12 4-pole connector makes for a quick field swap, and the IP67 rating handles washdown environments without a secondary enclosure.
The 500mm range is the maximum detection distance for a standard white target; real-world range on dark or matte surfaces will be shorter. The PNP light-on output means the load is energized when the sensor sees the target — verify your PLC input type before wiring. The M12 connector is a standard 4-pole A-coded; any M12 cordset with the same pinout works.