{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD26-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD26-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD26-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD26-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 30 mm resolution, 1800 mm protected height, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8BD26-0SS1.","salesMarkdown":"## Type 4 safety light curtain receiver for PROFIsafe bus systems The Siemens 3SF7844-8BD26-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, designed for guarding hazard zones on automated machinery. It provides a 30 mm resolution over an 1800 mm protected height with a sensing range of 0 to 18 m, and connects directly to a PROFIsafe bus network for safety-related data exchange. Type 4 per IEC 61496-1 means this receiver is rated for the highest level of detection reliability — it can be used in safety circuits up to SIL 3 / PL e, suitable for guarding robotic cells, assembly stations, and packaging lines where personnel access must be detected reliably. ## Integration notes for the controls integrator The PROFIsafe bus connection integrates directly into a SIMATIC FS420I safety controller or F-CPU. The 30 mm resolution catches fingers reaching into the hazard zone. The 1800 mm protected height covers a typical conveyor or machine access opening; the 0 to 18 m range allows placement at the far end of a long guarded area. Blanking capability (noted in the description) permits fixed objects like machine frames to pass through the detection field without triggering a stop.","metaTitle":"Siemens 3SF7844-8BD26-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-8BD26-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 1800 mm height, 0 to 18 m range, PROFIsafe bus. Lifecycle current. 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/3SF7844-8BD26-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and range of this light curtain receiver?","answer":"It has a 30 mm resolution, an 1800 mm protected height, and a sensing range of 0 to 18 m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD26-0SS1","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/3SF7844-8BD26-0SS1 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}}