{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8MD26-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8MD26-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8MD26-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8MD26-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I Type 4 safety light curtain receiver, 30 mm resolution, 1800 mm protected height, muting, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8MD26-0SS1.","salesMarkdown":"The Siemens 3SF7844-8MD26-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, designed for point-of-operation guarding where a 30 mm resolution catches fingers approaching the hazard zone (finger protection per IEC 61496-1/2). The 1800 mm protected height and 0 to 18 m range cover large access openings on assembly lines or robotic cells. Muting function integrated means it can blank out fixed obstructions (like a conveyor pallet) without disabling the safety output. Communication is over PROFIsafe via the bus connection, so it drops directly onto a SIMATIC safety PLC without a separate safety relay or interface module. That saves a DIN-rail slot and cuts wiring time on a panel build. Type 4 per IEC 61496-1 means the highest level of fault tolerance and self-checking — the curtain detects internal failures within a single scan cycle and goes to the safe-off state. That makes it suitable for safety applications up to SIL 3 / PL e without an external safety monitor. 30 mm resolution means a 30 mm diameter object (roughly a finger) will be detected anywhere in the protected field. For hand-access guarding, that's the standard spec. The 1800 mm height covers a full standing-person opening; the 0-18 m range lets you set the transmitter-receiver distance to fit the machine footprint. Muting is built in, not an add-on module. That means the curtain can ignore a fixed obstruction (like a part on a conveyor) while still guarding the rest of the field. The muting sensors and logic are handled through the PROFIsafe connection, so no extra wiring to a muting module.","metaTitle":"Siemens 3SF7844-8MD26-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-8MD26-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 1800 mm height, muting, 0-18 m range, PROFIsafe. Current lifecycle. 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/3SF7844-8MD26-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and range of this light curtain?","answer":"The 3SF7844-8MD26-0SS1 has a 30 mm resolution, 1800 mm protected height, and a 0 to 18 m operating range. The 30 mm resolution provides finger detection per Type 4 standards."},{"question":"Does this receiver include muting?","answer":"Yes, muting is integrated into this receiver. It can blank out fixed obstructions in the protected field without disabling the safety output, all handled through the PROFIsafe bus connection."},{"question":"Where can I buy 3SF7844-8MD26-0SS1?","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/3SF7844-8MD26-0SS1","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/3SF7844-8MD26-0SS1 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}}