The Siemens 3SF7844-8BB13-1SS1 is a Type 4 safety light curtain host receiver from the SIMATIC FS420I family, specified with 14 mm resolution over a 900 mm protected height and a 0 to 6 m operating range. The 14 mm finger-protection resolution (per IEC 61496-1) means it detects a 14 mm diameter object entering the field — standard for hand/finger detection at point-of-entry guarding stations. Blanking capability is built in, allowing fixed or floating objects within the field to be ignored without disabling the safety function.
Deployment context
This host receiver integrates into a safety circuit via PROFIsafe bus connection to a SIMATIC FS420I safety controller. The 14 mm resolution and Type 4 classification (SIL 3 / PL e capable) suit it for guarding robot cells, assembly stations, and automated guided vehicle pathways where hand or finger intrusion must be detected before a hazard can be reached. Blanking allows fixed machine elements (e.g., a conveyor frame) to pass through the field without triggering a stop.