{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD11-1SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD11-1SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD11-1SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD11-1SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I safety light curtain, Type 4 host receiver, 30 mm resolution, 750 mm protected height, blanking, 0 to 18 m range, PROFIsafe bus connection.","salesMarkdown":"The Siemens 3SF7844-8BD11-1SS1 is a Type 4 safety light curtain configured as the host receiver in a SIMATIC FS420I system. It provides a 30 mm resolution over a 750 mm protected height with a sensing range from 0 to 18 m, and integrates via PROFIsafe bus connection for direct communication with a safety-rated PLC. Type 4 per IEC 61496-1/2 means it is rated for the highest level of fault tolerance and detection reliability — suitable for guarding hazardous machinery where a failure could cause serious injury. The 30 mm resolution catches fingers approaching the hazard zone, while the 750 mm height covers a typical standing operator's reach zone. Blanking capability allows fixed or floating obscuration within the field, so the curtain can ignore a fixture or workpiece that passes through the beam pattern without disabling the safety function. ## Deployment context The receiver mounts to a machine frame or standoff using the standard FS420I bracket kit. PROFIsafe connection runs to a safety CPU (e.g., SIMATIC S7-1200F or S7-1500F) over a shielded M12 bus cable. The 0–18 m range covers most press, robot cell, and conveyor guarding layouts without a repeater.","metaTitle":"Siemens 3SF7844-8BD11-1SS1 Safety Light Curtain, Type 4, 750","metaDescription":"Siemens 3SF7844-8BD11-1SS1 Type 4 safety light curtain, host receiver, 30 mm resolution, 750 mm height, 0–18 m range, PROFIsafe. Current lifecycle stage. 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/3SF7844-8BD11-1SS1/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SF7844-8BD11-1SS1?","answer":"The part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What does Type 4 mean for this light curtain?","answer":"Type 4 per IEC 61496-1/2 is the highest safety integrity level for electro-sensitive protective equipment, meaning it can tolerate a single fault and still function safely — required for guarding applications with severe injury risk."},{"question":"What is the resolution and range of 3SF7844-8BD11-1SS1?","answer":"30 mm resolution (finger detection), 750 mm protected height, sensing range 0 to 18 m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD11-1SS1","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/3SF7844-8BD11-1SS1 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}}