The Siemens 3SF7844-8MP50-0SS1 is a Type 4 safety light grid receiver from the SIMATIC FS420I family, designed for guarding hazardous zones on automated production lines. Type 4 per IEC 61496 means it is rated for the highest level of immunity to optical interference and can be used in safety circuits up to SIL 3 / PL e without additional external monitoring.
Mounts in a standard safety light grid column or bracket set; the 800 mm receiver height pairs with a matching emitter (not included) to create a guarded zone. The PROFIsafe connection means it plugs directly into a SIMATIC FS420I safety controller or any PROFIsafe-capable F-host, reducing wiring compared to a dual-channel OSSD interface. Muting capability is built in, so the grid can be temporarily bypassed for material pass-through without breaking the safety circuit — useful on conveyor infeed or palletizing cells.