The Siemens 3RG7240-3CH00 is a SIMATIC PXO510 C40 diffuse sensor with background suppression, housed in a 40x40x55 mm rectangular body. It operates on DC 10-30 V and provides a PNP output rated at 200 mA, with a sensing range of 70 cm. The output is programmable for light-on or dark-on operation, and the connection is via a 4-pole M12 connector. The IP67 rating means it handles washdown and dusty environments without an enclosure.
The 70 cm sensing range is the rated maximum for a standard white target; real-world range on dark or angled surfaces will be shorter. The PNP output is sourcing type — verify your PLC input card is sinking (NPN) or use an interposing relay if the card expects NPN. The M12 connector is standard 4-pin; pin 1 is brown (L+), pin 3 blue (L-), pin 4 black (output), pin 2 white (programming/teach). The light/dark-on programming is done via the teach line or a button on the sensor body, depending on the variant.