Photoelectric sensors, W9, WL9G-3N1234S02, Functional principle: Photoelectric retro-reflective sensor, Functional principle detail: Without reflector minimum distance (autocollimation/coaxial optics), Switching output: NPN, Switching mode: Light switching, Connection type: Cable, 4-wire, 5 m, Light source: PinPoint LED, Adjustment: Teach-in button, Communication interface: -