{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8TB04-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8TB04-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8TB04-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8TB04-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3SF7844-8TB04-0SS1, Type 4 safety light curtain standard receiver, 14 mm resolution, 300 mm height, 0 to 6 m range, PROFIsafe bus connection, SIMATIC FS420I series.","salesMarkdown":"The Siemens 3SF7844-8TB04-0SS1 is a Type 4 safety light curtain receiver — the receiving half of a finger-protection guarding pair. Its 14 mm resolution means it catches a finger reaching into the hazard zone (finger-protection class per IEC 61496-1), and the 300 mm protected height covers a typical machine access opening. The 0 to 6 m range gives you flexibility in mounting distance from the emitter. PROFIsafe bus connection ties it directly into a SIMATIC FS420I safety CPU, so no separate safety relay is needed between the curtain and the controller — the safety signal travels over the fieldbus. Type 4 is the highest safety integrity level for light curtains per IEC 61496 — it's designed for guarding where a failure could cause serious injury. The 14 mm resolution is the critical number: it's the smallest object the curtain can reliably detect. That's finger-protection level, not hand or body. If your application only needs hand detection (30 mm), this part is over-specified and more expensive than a Type 2 or 30 mm Type 4. The 300 mm protected height is the vertical span the receiver covers; match it to the emitter of the same height. The 0 to 6 m range is the maximum separation between emitter and receiver — fine for most machine cells, but confirm your mounting distance falls inside it. This receiver is part of a safety light curtain system used to guard hazardous machine areas — press brakes, robotic cells, packaging lines, assembly stations. It mounts to the machine frame or guarding structure, aligned optically with the matching emitter. The PROFIsafe connection means it integrates into a Siemens safety PLC network without extra hardware. The receiver itself is the passive side; it communicates the curtain status back to the safety controller.","metaTitle":"Siemens 3SF7844-8TB04-0SS1 Type 4 Safety Light Curtain Recei","metaDescription":"Siemens 3SF7844-8TB04-0SS1 Type 4 safety light curtain receiver, 14mm resolution, 300mm height, 0-6m range, PROFIsafe bus. Active lifecycle. 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/3SF7844-8TB04-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and range of this light curtain receiver?","answer":"It has a 14 mm resolution (finger protection) and a 0 to 6 m operating range between the emitter and receiver."},{"question":"Where can I buy 3SF7844-8TB04-0SS1?","answer":"We source this part to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8TB04-0SS1","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/3SF7844-8TB04-0SS1 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}}