{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD24-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD24-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD24-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD24-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 30 mm resolution, 1650 mm protected height, blanking, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8BD24-0SS1.","salesMarkdown":"The 3SF7844-8BD24-0SS1: The 30 mm resolution means it can detect objects as small as 30 mm — typically a finger or hand — making it suitable for point-of-operation guarding where operators reach into a hazard zone. The 1650 mm protected height covers a full standing operator's reach zone, and the 0 to 18 m range gives flexibility for longer spans across a machine cell. Blanking allows certain fixed objects (like a part fixture) to be ignored without disabling the curtain, which is common in automated assembly lines. Type 4 per IEC 61496-1 is the highest safety integrity for electro-sensitive protective equipment, so this receiver integrates into a safety circuit up to SIL 3 / PL e without needing a separate safety controller for the basic function. The PROFIsafe bus connection means it plugs directly into a PROFINET safety network — no hardwired relay logic needed for the safety signal, which simplifies wiring in a modern control cabinet. ## Deployment context Mounts in a standard T-slot extrusion profile on the machine frame, with the transmitter aligned across the hazard opening. The PROFIsafe connection runs back to a safety-capable PLC.","metaTitle":"Siemens 3SF7844-8BD24-0SS1 Type 4 Safety Light Curtain Recei","metaDescription":"Siemens 3SF7844-8BD24-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 1650 mm height, blanking, 0-18 m range, PROFIsafe. 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/3SF7844-8BD24-0SS1/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD24-0SS1","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/3SF7844-8BD24-0SS1 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}}