{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8MD08-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8MD08-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8MD08-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8MD08-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420I series, Type 4 safety light curtain receiver, 30 mm resolution, 600 mm protective height, muting, 0 to 18 m range, Profisafe bus connection, order code 3SF7844-8MD08-0SS1.","salesMarkdown":"## Safety light curtain receiver for guarded access The Siemens 3SF7844-8MD08-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420I family, designed for guarding hazardous zones on automated machinery. It provides a 30 mm resolution over a 600 mm protective height, with a sensing range of 0 to 18 m, and integrates muting functionality for material handling passes. Communication is via Profisafe bus connection, making it a direct fit into Siemens safety-oriented control architectures. Type 4 per IEC 61496-1/2 is the highest safety integrity level for electro-sensitive protective equipment — it can be used for applications up to SIL 3 / PL e. The 30 mm resolution means the curtain detects fingers (30 mm is the minimum object size that will be reliably detected), so it suits point-of-operation guarding where hand access must be prevented. The 600 mm protective height covers a typical vertical opening for small to mid-size machine access points. Muting capability allows the curtain to be temporarily overridden during a workpiece pass-through without stopping the machine, which is essential for automated material handling lines. ## Integration with SIMATIC FS420I and Profisafe This receiver is part of the SIMATIC FS420I system and communicates over Profisafe, the safety-oriented bus protocol that runs on PROFINET. No separate safety relay is needed — the safety signals are transmitted directly to a failsafe controller (e.g., SIMATIC S7-1200F or S7-1500F). The 0 to 18 m range covers long access zones; the actual maximum range depends on the paired emitter and ambient conditions. Mounting hardware and alignment aids are standard for the FS420I family.","metaTitle":"Siemens 3SF7844-8MD08-0SS1 Safety Light Curtain Receiver, Ty","metaDescription":"Siemens 3SF7844-8MD08-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 600 mm height, 0–18 m range, Profisafe bus connection for SIMATIC FS420I. Current lifecycle stage","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/3SF7844-8MD08-0SS1/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3SF7844-8MD08-0SS1?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the resolution and protective height of this light curtain?","answer":"The 3SF7844-8MD08-0SS1 has a 30 mm resolution and a 600 mm protective height, with a sensing range of 0 to 18 m."},{"question":"Does this receiver support muting?","answer":"Yes, the receiver includes muting functionality, allowing temporary override of the curtain during material handling passes without stopping the machine."},{"question":"What bus protocol does this light curtain use?","answer":"It uses Profisafe bus connection, integrating directly with Siemens SIMATIC FS420I safety controllers over PROFINET."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3SF7844-8MD08-0SS1","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/3SF7844-8MD08-0SS1 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}}