{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8TB13-1SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8TB13-1SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8TB13-1SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8TB13-1SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I, Type 4 safety light curtain host receiver, 14 mm resolution, 900 mm protective height, 0 to 6 m range, PROFIsafe bus connection, order code 3SF7844-8TB13-1SS1.","salesMarkdown":"The Siemens 3SF7844-8TB13-1SS1 is a Type 4 host receiver in the SIMATIC FS420I safety light curtain family, specified for finger-protection applications with 14 mm resolution across a 900 mm protective height and a 0 to 6 m operating range. It connects via PROFIsafe bus, making it a direct drop-in for Siemens F-CPU safety systems on PROFINET networks. The 14 mm resolution means this curtain catches fingers reaching into the hazard zone — finger-protection class per IEC 61496-1/2 — so it suits press-brake, pick-and-place, or assembly stations where hand access is possible but arm-through is not. The 900 mm protective height covers a typical vertical guarding zone for seated workstations or small conveyor infeed sections. The 0 to 6 m range is the transmitter-to-receiver separation; at maximum range the optical alignment tolerance narrows, so keep the pair within 4 m for easier commissioning on a crowded line. ## Deployment context As a host receiver in a Type 4 system, this unit handles the safety logic evaluation and PROFIsafe communication internally — no separate safety relay or F-Switch needed for the bus connection. Mounts in the standard FS420I column profile; the M12 bus connector and the 24 VDC power loop share the same cable run, so plan for a 4-conductor shielded cable (two for power, two for PROFIsafe) per the SIMATIC FS420I manual. The IP65-rated housing handles washdown in food-and-bev or automotive body-shop environments.","metaTitle":"Siemens 3SF7844-8TB13-1SS1 Light Curtain Type 4 Host Receive","metaDescription":"Siemens 3SF7844-8TB13-1SS1 Type 4 safety light curtain host receiver, 14 mm resolution, 900 mm height, 0-6 m range, PROFIsafe. Active production; 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/3SF7844-8TB13-1SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the 3SF7844-8TB13-1SS1 used for?","answer":"It is a Type 4 safety light curtain host receiver with 14 mm resolution and 900 mm protective height, used for finger-protection guarding on machinery with PROFIsafe safety bus integration."},{"question":"Where can I buy 3SF7844-8TB13-1SS1?","answer":"This part is sourced and quoted 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/3SF7844-8TB13-1SS1","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/3SF7844-8TB13-1SS1 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}}