The 3SF7844-8MB15-0SS1: The 14 mm resolution means the receiver detects objects as small as 14 mm entering the field — this is finger-protection class per IEC 61496-1, so it catches a hand reaching into the hazard zone before the fingers contact a moving part. The 1050 mm protected height defines the vertical coverage; pair it with a matching transmitter of the same height to create a curtain that guards a 1050 mm opening. The 0 to 6 m operating range sets the maximum separation between transmitter and receiver, which governs how far across a machine opening the curtain can span. Type 4 per IEC 61496-2 means the light curtain is rated for the highest safety integrity — it can be used in safety circuits up to SIL 3 / PL e without additional external diagnostics. The PROFIsafe bus connection allows direct integration into a SIMATIC safety controller over the PROFIBUS or PROFINET network, eliminating the need for a separate safety relay module for the safety signal.
Deployment context
Mount the receiver on the opposite side of the hazard zone from the matching transmitter, aligned so the infrared beams form a continuous curtain. The muting function lets the curtain temporarily bypass when a workpiece passes through, so the machine does not stop for every material feed — common on assembly lines and palletizers. The PROFIsafe connection means the safety signal travels over the fieldbus to the safety PLC, so the receiver is wired to the network segment, not to a dedicated safety relay.