Type 4 Safety Light Curtain Host Receiver
The Siemens 3SF7844-8BD20-1SS1 is a Type 4 host receiver in the SIMATIC FS420I light curtain family, configured for a 30 mm resolution, 1350 mm protective height, and a 0 to 18 m operating range with PROFIsafe bus connection.
Safety Application Context
As a Type 4 device per IEC 61496-1/2, this light curtain is rated for use in safety circuits up to SIL 3 / PL e, suitable for guarding hazard zones where a 30 mm resolution detects fingers reaching into the protected area.