Safety light curtain receiver — Type 4, 14 mm, PROFIsafe
The Siemens 3SF7844-8BB22-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, with 14 mm resolution and a 1500 mm protected height. The 14 mm detection capability means it catches fingers reaching into the hazard zone — finger-protection class per IEC 61496-1 — making it suitable for guarding access points on assembly lines, packaging machines, and robotic cells where hand entry must be detected without allowing a full body pass-through. Operating range spans 0 to 6 m, and the unit communicates via PROFIsafe bus connection, integrating directly into a Siemens safety PLC architecture without a separate safety relay. The receiver pairs with a matching emitter (same resolution and height) to form a complete light curtain set.
Integration notes
The receiver mounts in the standard safety light curtain column profile; alignment brackets and cable glands are ordered separately per the FS420I system manual. PROFIsafe wiring uses an M12 bus connector — verify the pinout matches the safety PLC's F-host module before terminating. Blanking function is supported (noted in the description), allowing fixed or floating blanking of up to two beams for workpiece pass-through without stopping the machine. Configuration is done via the Siemens safety configuration tool (S7 F/FH systems).