The Siemens 3SF7844-8TB08-0SS1 is a Type 4 safety light curtain receiver with 14 mm resolution and 600 mm protected height, covering a 0 to 6 m operating range. It connects via PROFIsafe bus to a SIMATIC FS420I safety controller. The 14 mm detection capability means it catches fingers reaching into the hazard zone (finger-protection class per IEC 61496-1), making it suitable for guarding access points on automated assembly lines or packaging machinery where hand entry must be prevented.
Integration Notes
The receiver is part of the SIMATIC FS420I safety system and communicates over PROFIsafe, so it requires a compatible safety CPU on the same bus. The 14 mm resolution and 600 mm height define the guarded area: mount the emitter and receiver aligned at the same height, with the receiver's PROFIsafe connection wired to the FS420I interface module. The 0–6 m range covers most machine guarding distances — verify the actual separation against the maximum to avoid signal loss.