{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BB17-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BB17-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BB17-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BB17-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 14 mm resolution, 1200 mm protected height, 0 to 6 m range, PROFIsafe bus connection, order code 3SF7844-8BB17-0SS1.","salesMarkdown":"The Siemens 3SF7844-8BB17-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, designed for finger-protection applications with 14 mm resolution over a 1200 mm protected height. The 14 mm detection gap means it catches fingers reaching into the hazard zone (finger-protection class per IEC 61496-1), making it suitable for guarding press brakes, assembly stations, and robotic cells where hand access must be detected before a dangerous motion completes. Communication is via PROFIsafe bus connection, integrating directly into a SIMATIC safety PLC without a separate safety relay or interface module. The operating range spans 0 to 6 m, and blanking capability allows fixed or floating object suppression for workpiece pass-through without disabling the safety function. ## Integration Notes Mounts as the receiver half of a through-beam pair; the emitter (order code 3SF7844-8AA17-0SS1) is ordered separately. The PROFIsafe connection uses a standard M12 bus connector — verify the device-specific GSDML file is loaded into your TIA Portal project before commissioning. The 14 mm resolution and Type 4 architecture (SIL 3 / PL e per IEC 62061 / ISO 13849-1) mean this curtain is rated for the highest risk-reduction category in point-of-operation guarding. Blanking is configured via the FS420I parameterization tool, not hard-wired.","metaTitle":"Siemens 3SF7844-8BB17-0SS1 Safety Light Curtain Receiver, 14","metaDescription":"Siemens 3SF7844-8BB17-0SS1 Type 4 safety light curtain receiver, 14 mm resolution, 1200 mm height, 0-6 m range, PROFIsafe, SIMATIC FS420I. Current lifecycle stage. Quoted on reques","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/3SF7844-8BB17-0SS1/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SF7844-8BB17-0SS1 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — no stock count or price is carried on this listing."},{"question":"What is 3SF7844-8BB17-0SS1's listed description?","answer":"The description is: LIGHT CURTAIN TYPE 4 STANDARD RECEIVER 14 MM 1200 MM BLANKING 0 TO 6 M PROFISAFE BUS CONNECTION SIMATIC FS420I."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BB17-0SS1","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/3SF7844-8BB17-0SS1 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}}