Safety light grid receiver for guarded-area access
The Siemens 3SF7844-8MS50-0SS1 is a Type 4 standard receiver for the SIMATIC FS420i safety light grid system, rated for 0 to 18 m range with a 500 mm protective height. Muting function is built in, so the grid can temporarily suppress its output during a material pass-through without interrupting the safety logic. PROFIsafe bus connection via the FS420i interface integrates directly into a Siemens safety PLC or F‑CPU, keeping the safety signal on a dedicated bus rather than hardwired relay logic.
Deployment context
Mounts as the receive side of a Type 4 light grid pair; the emitter (separate order code) and this receiver define a detection plane across a guarded opening up to 18 m wide. The 500 mm protective height covers a vertical zone typical for hand‑and‑arm access — common on palletizers, press brakes, and automated assembly cells. Muting sensors and logic are handled within the grid itself, so no external muting module is required; the PROFIsafe connection carries both the safety status and the muting state to the controller.