{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD04-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD04-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD04-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD04-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 30 mm resolution, 300 mm protective height, 0 to 18 m range, Profisafe bus connection, order code 3SF7844-8BD04-0SS1.","salesMarkdown":"The Siemens 3SF7844-8BD04-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I series, specified with 30 mm resolution and a 300 mm protective height. The 0 to 18 m operating range covers long-reach guarding zones on conveyor lines or gantry cells. Profisafe bus connection integrates directly into a safety-rated PROFINET network, eliminating the need for a separate safety relay or interface module — the receiver talks to the F-CPU over the bus, and the safety function lives in the controller logic. 30 mm resolution means the curtain detects a 30 mm diameter object anywhere in the field — finger-protection class per IEC 61496-1/2, suitable for hand-entry hazard zones. The 300 mm protective height defines the guarded area; pair it with a matching 300 mm transmitter (same series) to cover the full opening. The 0 to 18 m range gives flexibility for long aisles or wide machine perimeters without adding a second curtain pair. Blanking capability (noted in the description) allows fixed or floating blanking of up to two beams, so the curtain can ignore a stationary fixture or a workpiece that must pass through the field. This is configured via the Profisafe bus — no physical bypass switch, which keeps the safety integrity intact. ## Integration and deployment Mounts in standard slotted aluminum guardrail profiles or directly to machine framing via the supplied brackets. The Profisafe bus connection uses a standard M12 connector; cable runs to the next FS420I node or to a PROFINET switch. The receiver draws its power from the bus — no separate 24 V supply needed at the curtain. Alignment aids (visible LED indicators on the housing) speed the optical setup during commissioning.","metaTitle":"Siemens 3SF7844-8BD04-0SS1 Type 4 Safety Light Curtain Recei","metaDescription":"Siemens 3SF7844-8BD04-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 300 mm height, 0–18 m range, Profisafe bus connection. Current lifecycle stage. 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/3SF7844-8BD04-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and range of this light curtain receiver?","answer":"The 3SF7844-8BD04-0SS1 has 30 mm resolution and a 0 to 18 m operating range, with a 300 mm protective height."},{"question":"How is the 3SF7844-8BD04-0SS1 connected to the safety controller?","answer":"It connects via Profisafe bus (PROFINET with safety profile), so the safety function is handled by the F-CPU over the network — no separate safety relay needed."},{"question":"Where can I buy 3SF7844-8BD04-0SS1 and how is it quoted?","answer":"The part is sourced 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/3SF7844-8BD04-0SS1","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/3SF7844-8BD04-0SS1 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}}