Safety light curtain receiver — fit and function
The Siemens 3SF7844-8BB15-0SS1 is a Type 4 standard receiver from the SIMATIC FS420I safety light curtain family, with 14 mm resolution over a 1050 mm protected height and a sensing range of 0 to 6 m. Type 4 per IEC 61496-1/2 means it is rated for the highest safety integrity — suitable for guarding hazardous machine zones where a person reaching into the danger area must be reliably detected. The 14 mm finger-protection resolution catches digits before they reach the pinch point. PROFIsafe bus connection integrates directly into a safety-rated PROFINET network, eliminating a separate safety relay module.