{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3SF7844-8MD22-0SS1","brand":"Siemens","brandSlug":"siemens","productSlug":"3SF7844-8MD22-0SS1","canonicalUrl":"https://aoctrl.com/siemens/3SF7844-8MD22-0SS1","factsUrl":"https://aoctrl.com/api/mcp/products/3SF7844-8MD22-0SS1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC FS420i Type 4 safety light curtain receiver, 30 mm resolution, 1500 mm protective height, muting function, 0 to 18 m range, PROFIsafe bus connection, order code 3SF7844-8MD22-0SS1.","salesMarkdown":"The Siemens 3SF7844-8MD22-0SS1 is a Type 4 safety light curtain receiver from the SIMATIC FS420i family, designed for finger and hand protection on access points and hazardous zones. With 30 mm resolution and a 1500 mm protective height, it detects objects as small as 30 mm across the full height — suitable for guarding robot cells, assembly stations, and palletizers where personnel access must be detected without physical barriers. The 0 to 18 m operating range gives flexibility for wide openings or long conveyor in-feed zones. Type 4 per IEC 61496-1 means the receiver is rated for the highest safety integrity level for electro-sensitive protective equipment, capable of withstanding a single fault without losing the safety function. The PROFIsafe bus connection integrates directly into a SIMATIC safety PLC or F-capable controller over the standard PROFINET network, eliminating the need for a separate safety relay or interface module — the safety signal travels over the same cable as standard I/O. The muting function allows the light curtain to be temporarily overridden during material transport (e.g., a pallet passing through the protected zone) while still maintaining safety for personnel. This is a configurable feature typically set during commissioning via the FS420i software or the controller's safety program. ## Integration notes The receiver mounts to a standard extruded-aluminum profile or bracket system common to the FS420i family. Alignment with the matching transmitter (typically a 3SF7844-8MD22-0SS0 or similar) requires the supplied alignment tool and a clear line of sight. The PROFIsafe connection uses a standard M12 connector (D-coded) for the bus interface; the power supply is typically 24 VDC drawn from the same bus cable or a separate M12 L-coded connector depending on the variant. Commissioning involves configuring the muting sensors (typically two through-beam sensors per muting zone) and setting the blanking or reduced-resolution parameters in the safety program. The receiver's diagnostic LEDs indicate alignment quality, muting status, and bus communication health — useful during FAT and on-site startup.","metaTitle":"Siemens 3SF7844-8MD22-0SS1 Type 4 Safety Light Curtain Recei","metaDescription":"Siemens 3SF7844-8MD22-0SS1 Type 4 safety light curtain receiver, 30 mm resolution, 1500 mm height, muting, PROFIsafe, 0-18 m range. Current lifecycle stage. Available 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/3SF7844-8MD22-0SS1/alternatives.json"},"ai":{"faq":[{"question":"What is the resolution and protective height of this light curtain?","answer":"The 3SF7844-8MD22-0SS1 has a 30 mm resolution and a 1500 mm protective height, suitable for finger and hand detection across the full height."},{"question":"Does this receiver support muting and PROFIsafe?","answer":"Yes, it includes muting functionality and connects via PROFIsafe bus to a SIMATIC safety controller, eliminating the need for a separate safety relay."},{"question":"Where can I buy 3SF7844-8MD22-0SS1?","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/3SF7844-8MD22-0SS1","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/3SF7844-8MD22-0SS1 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}}