{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7451-3AL00-0AE0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7451-3AL00-0AE0","canonicalUrl":"https://aoctrl.com/siemens/6ES7451-3AL00-0AE0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7451-3AL00-0AE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 6ES7451-3AL00-0AE0 — now in phase-out and being discontinued. Supplied from remaining channel stock; full specifications, lifecycle and same-series options are below.","salesMarkdown":"The FM 451 decodes quadrature encoder signals (A, B) and the DATA/notDATA lines for absolute encoder SSI interfaces, with a zero-mark signal absent on this variant. Each of the three axes handles 4 inputs and 4 outputs, supporting rapid traverse, creep, run right, and run left motion profiles directly from the module without burdening the CPU. ## Applications This positioning module is used in S7-400-based machine tools, packaging lines, and assembly stations where three independent axes must be coordinated for point-to-point moves, tool positioning, or synchronized pick-and-place cycles. The on-board motion functions offload real-time positioning from the CPU, freeing it for higher-level logic and HMI communication.","metaTitle":"Siemens 6ES7451-3AL00-0AE0 FM 451 Positioning Module","metaDescription":"Siemens FM 451 positioning module 6ES7451-3AL00-0AE0: 5 V differential input, 12 inputs/outputs (4 per axis), 1.25 MHz, 24 V DC, 3.6 W, RoHS.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"5 V":"Yes","24 V":"Yes","Max.":"70 °C","Min.":"-40 °C","Depth":"210 mm","Width":"50 mm","Height":"290 mm","Functions":"Rapid traverse, creep, run right, run left","Gray code":"1","Data signal":"DATA, notDATA","Clock signal":"CL, notCL","Input signal":"5 V difference signal (phys. RS 422)","Input voltage":"24 V","For Signal \"0\"":"-30 to +5 V","For Signal \"1\"":"+11 to +30V","Weight, approx.":"1 300 g","lifecycle_stage":"mature","Power loss, typ.":"3.6 W","Rated value (DC)":"24 V","Zero mark signal":"N","Cable length, max.":"300 m; At max. 156 kbit/s","Trace mark signals":"A, B","For Signal \"1\", Min.":"UP -3 V","For Signal \"1\", Typ.":"9 mA","Output current, max.":"300 mA","Clock frequency, max.":"1.25 MHz","Input frequency, max.":"50 kHz; for 25 m cable length, 25 kHz for 100 m cable length","Absolute encoder (SSI)":"Yes","Type of output voltage":"24 V DC","Number of digital inputs":"12; 4 per axis","Required Front Connector":"1x 48-pin","Short-circuit protection":"Yes","Current consumption, typ.":"550 mA","Number of digital outputs":"12; 4 per axis","Cable length, shielded, max.":"300 m; At max. 156 kbit/s","Telegram length, parameterizable":"13 or 25 bit serial","Incremental encoder (symmetrical)":"Yes","Incremental encoder (asymmetrical)":"Yes","Potential separation digital inputs":"Yes","Potential separation digital outputs":"Yes","For Signal \"0\" Residual Current, Max.":"0.5 mA","For Signal \"0\", Max. (Permissible Quiescent Current)":"1.5 mA","for signal \"1\" permissible range for 0 to 55 °C, max.":"600 mA; with UPmax"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,113.62 – $3,141.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e6ca154da5c193684ed1f6175da8c248.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=369935&mlfb=6ES7451-3AL00-0AE0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7451-3AL00-0AE0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7451-3AL00-0AE0","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/6ES7451-3AL00-0AE0 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}}