{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8BD15-1SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8BD15-1SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8BD15-1SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8BD15-1SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420i Type 4 safety light curtain host receiver, 30 mm resolution, 1050 mm protected height, 0–18 m range, PROFIsafe bus connection, order code 3SF7844-8BD15-1SS1.","salesMarkdown":"The Siemens 3SF7844-8BD15-1SS1 is a Type 4 safety light curtain host receiver from the SIMATIC FS420i family, with 30 mm resolution, 1050 mm protected height, and a sensing range of 0 to 18 m. Type 4 per IEC 61496-1 means this curtain is rated for the highest safety integrity — it can detect a 30 mm object (finger-protection class) and is designed for use in safety circuits up to SIL 3 / PL e. The 1050 mm protected height covers a typical machine access zone; the 0–18 m range gives flexibility for longer guarding spans without needing a secondary curtain. Blanking capability (noted in the description) allows fixed obstructions like machine frames to be ignored, so the curtain can guard an irregular opening without nuisance trips. ## Deployment context As a Type 4 host receiver with PROFIsafe bus connection, this light curtain integrates directly into a SIMATIC safety controller environment — no separate safety relay needed between the curtain and the F-CPU. The 30 mm resolution makes it suitable for guarding robot cells, packaging machinery, and assembly stations where hand or finger access must be detected. In a washdown environment (e.g., food-and-beverage lines), verify the IP rating of the full curtain pair; the host receiver itself is typically IP65/IP67, but the mating emitter and cabling must match the zone's hygiene requirements.","metaTitle":"Siemens 3SF7844-8BD15-1SS1 Safety Light Curtain, Type 4, 30","metaDescription":"Siemens 3SF7844-8BD15-1SS1 Type 4 safety light curtain host receiver, 30 mm resolution, 1050 mm height, 0–18 m range, PROFIsafe bus, SIMATIC FS420i. Current lifecycle stage; source","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/3SF7844-8BD15-1SS1/alternatives.json"},"ai":{"faq":[{"question":"What is 3SF7844-8BD15-1SS1 used for?","answer":"It is a Type 4 safety light curtain host receiver with 30 mm resolution, 1050 mm protected height, and 0–18 m range, used for finger-protection guarding in safety-rated automation cells, connected via PROFIsafe bus to a SIMATIC FS420i safety controller."},{"question":"Where can I buy 3SF7844-8BD15-1SS1?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8BD15-1SS1","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/3SF7844-8BD15-1SS1 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}}