The Siemens 3SF7844-8BD15-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, specified for applications requiring a 30 mm resolution over a 1050 mm protected height and an operating range of 0 to 18 m. It supports blanking and connects via PROFIsafe bus.
The 30 mm resolution on this receiver provides finger detection (hand protection) per IEC 61496-2, suitable for guarding hazard zones where operators reach toward the danger area. The 1050 mm height covers a typical waist-to-shoulder zone on a standing operator.
As a receiver with PROFIsafe bus connection, it integrates directly into a SIMATIC safety CPU or F-capable controller over the PROFIsafe protocol, eliminating the need for a separate safety relay module. The blanking function allows fixed or floating blanking to ignore stationary objects (e.g., fixture posts) within the field.