{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD08-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD08-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD08-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD08-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 30 mm resolution, 600 mm protected height, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8BD08-0SS1.","salesMarkdown":"The Siemens 3SF7844-8BD08-0SS1 is a Type 4 safety light curtain receiver in the SIMATIC FS420I family, with 30 mm resolution, 600 mm protected height, and a sensing range of 0 to 18 m. It connects via PROFIsafe bus, integrating directly into a safety-rated fieldbus architecture. Type 4 per IEC 61496-1/2 means this receiver is rated for the highest safety integrity — capable of detecting a 30 mm object (finger protection) across the full 600 mm height. The 0 to 18 m range covers most machine guarding zones from small assembly cells to large robotic workcells. The PROFIsafe bus connection eliminates hardwired safety relay logic; the receiver communicates safety status directly to a F-CPU over the PROFINET network. The 30 mm resolution is the key selection parameter: it catches fingers reaching into the hazard zone, meeting the finger-protection class per IEC 61496-1. For hand or palm detection (40 mm or coarser), a different model in the FS420I family would apply. ## Deployment context Mounts to standard machine guarding frames or T-slot profiles. The PROFIsafe bus connection means the receiver pairs with a Siemens F-CPU (e.g., ET 200SP F or S7-1500F) over PROFINET — no separate safety relay needed. The 600 mm height suits guarding of a typical conveyor infeed or robot cell access point.","metaTitle":"Siemens 3SF7844-8BD08-0SS1 Safety Light Curtain Receiver, 30","metaDescription":"Siemens 3SF7844-8BD08-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 600 mm height, 0–18 m range. PROFIsafe bus connection. Lifecycle: current. 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/3SF7844-8BD08-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is 3SF7844-8BD08-0SS1 used for?","answer":"It is a Type 4 safety light curtain receiver with 30 mm resolution and 600 mm protected height, used for finger-protection guarding on machines and robotic cells, communicating safety status over PROFIsafe bus."},{"question":"Where can I buy 3SF7844-8BD08-0SS1?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial automation 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/3SF7844-8BD08-0SS1","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/3SF7844-8BD08-0SS1 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}}