The 3SF7844-8BB11-1SS1 is a Siemens SIMATIC FS420I Type 4 safety light curtain configured as the host receiver. It provides a 14 mm resolution over a 750 mm protected height, with a sensing range of 0 to 6 meters, and integrates via PROFIsafe bus connection.
14 mm resolution means it detects fingers reaching into the hazard zone, meeting finger-protection class per IEC 61496-1. The 750 mm height covers a typical vertical guarding aperture on a small assembly or packaging line. PROFIsafe bus connection eliminates point-to-point safety wiring — the host receiver communicates safety status and diagnostic data directly to an F-CPU over the PROFINET network.