{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD11-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD11-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD11-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD11-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I, Type 4 safety light curtain receiver, 30 mm resolution, 750 mm protected height, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8BD11-0SS1.","salesMarkdown":"## Safety light curtain receiver, Type 4, 30 mm resolution, PROFIsafe The Siemens 3SF7844-8BD11-0SS1 is a Type 4 safety light curtain receiver in the SIMATIC FS420I family, with 30 mm resolution, 750 mm protected height, and a sensing range of 0 to 18 m. It connects via PROFIsafe bus, making it a drop-in receiver for a safety-rated light curtain guarding a hazard zone up to that height and range. The 30 mm resolution catches fingers (finger protection) reaching into the guarded area. ## Integration notes Mounts as the receiver half of a Type 4 safety light curtain system. PROFIsafe bus connection integrates directly into a SIMATIC safety PLC or F-CPU, eliminating the need for a separate safety relay for the bus interface. The 750 mm protected height covers a typical conveyor infeed or machine access point; pair with the matching emitter for the full 0-18 m range.","metaTitle":"Siemens 3SF7844-8BD11-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-8BD11-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 750 mm height, 0-18 m range, PROFIsafe bus. Current lifecycle stage. Available 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/3SF7844-8BD11-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the 3SF7844-8BD11-0SS1 used for?","answer":"It is a Type 4 safety light curtain receiver (30 mm resolution, 750 mm height, 0-18 m range) with PROFIsafe bus connection, used for guarding hazard zones in automated machinery."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD11-0SS1","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/3SF7844-8BD11-0SS1 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}}