Type 4 safety light curtain receiver for PROFIsafe bus systems
The Siemens 3SF7844-8BD26-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, designed for guarding hazard zones on automated machinery. It provides a 30 mm resolution over an 1800 mm protected height with a sensing range of 0 to 18 m, and connects directly to a PROFIsafe bus network for safety-related data exchange. Type 4 per IEC 61496-1 means this receiver is rated for the highest level of detection reliability — it can be used in safety circuits up to SIL 3 / PL e, suitable for guarding robotic cells, assembly stations, and packaging lines where personnel access must be detected reliably.
Integration notes for the controls integrator
The PROFIsafe bus connection integrates directly into a SIMATIC FS420I safety controller or F-CPU. The 30 mm resolution catches fingers reaching into the hazard zone. The 1800 mm protected height covers a typical conveyor or machine access opening; the 0 to 18 m range allows placement at the far end of a long guarded area. Blanking capability (noted in the description) permits fixed objects like machine frames to pass through the detection field without triggering a stop.