Safety Light Curtains are optoelectronic presence-sensing safeguarding devices designed to protect personnel from moving machinery hazards by creating a planar sensing barrier using multi-beam infrared light arrays. When an opaque object or human limb interrupts any of the light beams, the light curtain immediately transmits a stop signal to the machine control system to halt hazardous motion before access occurs. Key hardware features typically include rugged extruded aluminum housings, optical alignment indicators, integrated muting and blanking function logic, vibration-resistant mounting brackets, and dual-channel safety outputs with M12 quick-disconnect connectors.