{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-6TD11-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-6TD11-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-6TD11-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-6TD11-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS440I, Type 4 safety light curtain receiver, 30 mm resolution, 750 mm protected height, 0 to 18 m range, ASISAFE bus connection, order code 3SF7844-6TD11-0SS1.","salesMarkdown":"## Safety light curtain receiver for point-of-operation guarding The Siemens 3SF7844-6TD11-0SS1 is a Type 4 safety light curtain receiver with 30 mm resolution and a 750 mm protected height, designed for cycle control applications where operator access to a hazard zone must be reliably detected. Sensing range is 0 to 18 m. Detects objects of 30 mm or larger. Communication is via the ASISAFE bus connection, integrating into a SIMATIC FS440I safety system without additional interface modules; the bus carries both safety signals and diagnostic data back to the safety CPU. For BOM-line commitment, the key fit parameters are the 30 mm resolution (determines what size object the curtain detects), the 750 mm protected height (must cover the full hazard opening), and the ASISAFE bus protocol (must match the existing safety controller). ## Integration into a safety circuit Mount the receiver opposite the emitter across the hazard zone, aligned so the optical axis is unobstructed. The 0 to 18 m range covers most machine cells; for longer spans a different curtain family would be needed. The ASISAFE bus connection replaces point-to-point OSSD wiring — the safety signals and configuration data travel on the same two-wire bus cable back to the FS440I controller, reducing panel wiring and simplifying diagnostics. Type 4 per IEC 61496-1 means the curtain is rated for the highest safety integrity (SIL 3 / PL e) and can be used for point-of-operation guarding where a hand or finger entering the field must stop the machine before contact.","metaTitle":"Siemens 3SF7844-6TD11-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-6TD11-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 750 mm height, 0-18 m range, ASISAFE bus, SIMATIC FS440I. Current lifecycle. Sourced 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/3SF7844-6TD11-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and protected height of this light curtain?","answer":"The 3SF7844-6TD11-0SS1 has 30 mm resolution with a 750 mm protected height, meaning it detects objects of 30 mm or larger entering the field across a 750 mm vertical span."},{"question":"What bus protocol does this receiver use?","answer":"It uses the ASISAFE bus connection for integration into a SIMATIC FS440I safety system, carrying both safety signals and diagnostics on a single bus cable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-6TD11-0SS1","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/3SF7844-6TD11-0SS1 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}}