What it is and what it does
The Siemens 3RG7650-3GA00 is a SIMATIC PXO210 M18S diffuse photoelectric sensor with energetic, rectangled optics. It detects objects at up to 500 mm, outputs NPN dark-on, and runs on 10-30V DC. The M12 4-pole connector and IP67 rating suit it for panel or machine mounting in industrial environments.