{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BB20-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BB20-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BB20-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BB20-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I safety light curtain receiver, Type 4, 14 mm resolution, 1350 mm protected height, blanking, 0 to 6 m range, PROFIsafe bus connection, order code 3SF7844-8BB20-0SS1.","salesMarkdown":"The Siemens 3SF7844-8BB20-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I series, with a 14 mm resolution and a 1350 mm protected height. It is designed for finger and hand detection in guarding applications, blanking enabled, with a sensing range of 0 to 6 meters and a PROFIsafe bus connection for direct integration into a safety-rated fieldbus network. Type 4 per IEC 61496-1/2 means this light curtain is rated for the highest level of safety integrity — capable of detecting a 14 mm object anywhere in the protected field, even with a single component failure. That 14 mm resolution catches fingers reaching into the hazard zone (finger-protection class), so it suits press brakes, assembly stations, and robotic cells where hand access must be prevented without stopping production flow. The 1350 mm height covers a typical standing operator's reach zone. Blanking allows fixed or floating objects (e.g., a workpiece fixture) to pass through the field without tripping the safety output, which avoids nuisance stops on automated lines. ## Where this class of part is used Safety light curtains guard point-of-operation hazards on machinery — presses, cutters, packaging machines, assembly stations — where an operator or robot arm reaches into the danger area. The PROFIsafe bus connection on this receiver means it communicates safety signals directly to a F-CPU (e.g., SIMATIC S7-1200F/1500F) without hardwired safety relays, reducing panel wiring and enabling diagnostics like blanking status and beam degradation. Mounting columns and brackets are typically sourced separately; the receiver aligns optically with the matching transmitter (3SF7844-8BB20-0SS0 or similar FS420I emitter).","metaTitle":"Siemens 3SF7844-8BB20-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-8BB20-0SS1 Type 4 safety light curtain receiver. 14 mm resolution, 1350 mm height, blanking, 0-6 m range, PROFIsafe. Current lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Safety Interlock Switches"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BB20-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the 3SF7844-8BB20-0SS1 used for?","answer":"It is a Type 4 safety light curtain receiver used for finger and hand detection at machine hazard zones, with a 14 mm resolution, 1350 mm height, blanking capability, and a PROFIsafe bus connection for integration with SIMATIC safety controllers."},{"question":"Where can I buy 3SF7844-8BB20-0SS1 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BB20-0SS1","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3SF7844-8BB20-0SS1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}