The Siemens 3RG7640-3CC00 is a SIMATIC PXO210 M18S diffuse photoelectric sensor with energetic straight optics. It operates on 10–30 V DC, has a sensing range of 500 mm, and outputs PNP antivalent (complementary) at 150 mA. The housing is M18×65 with an M12 4-pole connector and IP67 rating.
The 500 mm sensing range is the rated detection distance for a standard diffuse target (90% reflectance white card). Real-world range on dark or matte surfaces will be shorter — plan for 60–70% of rated. The PNP antivalent output gives both normally-open and normally-closed signals on separate pins, useful for dual-channel safety or status feedback without an external inverter. The M12 connector, 4-pole, carries power and both outputs; verify your cable pinout matches the Siemens standard (pin 1 = brown +, pin 3 = blue –, pin 4 = black NO, pin 2 = white NC).
The IP67 enclosure handles washdown and dusty environments — suitable for conveyor lines, packaging machinery, or material handling where coolant or occasional hose-down is present. The M18 threaded barrel fits standard mounting brackets and through-hole installations.