{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD04-1SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD04-1SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD04-1SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD04-1SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I, Type 4 safety light curtain host receiver, 30 mm resolution, 300 mm blanking, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8BD04-1SS1.","salesMarkdown":"The Siemens 3SF7844-8BD04-1SS1 is a Type 4 safety light curtain host receiver from the SIMATIC FS420I family, with 30 mm resolution, 300 mm blanking capability, and a detection range of 0 to 18 meters. Type 4 per IEC 61496-1 means it can be used for finger and hand protection in high-risk guarding applications — the 30 mm resolution catches fingers reaching into the hazard zone, while the 18 m range covers longer access points on a conveyor or machine perimeter. ## Deployment Context This host receiver is the PROFIsafe bus-connected half of a Type 4 light curtain pair — it handles the safety logic communication back to the F-CPU or safety drive, so the emitter (ordered separately) completes the pair. The 300 mm blanking feature lets you program fixed or floating blanking zones to ignore small objects (like a part on a conveyor) without disabling the entire curtain. Mounting hardware and alignment aids are standard for the FS420I family; the PROFIsafe connection uses a standard M12 bus connector, which keeps field wiring consistent with the rest of a Siemens safety network.","metaTitle":"Siemens 3SF7844-8BD04-1SS1 Safety Light Curtain, Type 4 Host","metaDescription":"Siemens 3SF7844-8BD04-1SS1 Type 4 safety light curtain host receiver, 30 mm resolution, 300 mm blanking, 0 to 18 m range, PROFIsafe bus connection for SIMATIC FS420I. Current lifec","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/3SF7844-8BD04-1SS1/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3SF7844-8BD04-1SS1?","answer":"Pricing and availability are confirmed at quote time against an RFQ through independent distribution. Submit an RFQ for current figures."},{"question":"What is 3SF7844-8BD04-1SS1's listed description?","answer":"The listed description is: LIGHT CURTAIN TYPE 4 HOST RECEIVER 30 MM 300 MM BLANKING 0 TO 18 M PROFISAFE BUS CONNECTION SIMATIC FS420I."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD04-1SS1","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/3SF7844-8BD04-1SS1 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}}