{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7351-1AH02-0AE0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7351-1AH02-0AE0","canonicalUrl":"https://aoctrl.com/siemens/6ES7351-1AH02-0AE0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7351-1AH02-0AE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 FM 351 positioning module, order code 6ES7351-1AH02-0AE0, 8 digital inputs, 8 digital outputs, max. 50 kHz input frequency, end-of-life (EOL).","salesMarkdown":"## Positioning module for the S7-300 rack The Siemens 6ES7351-1AH02-0AE0 is a FM 351 positioning module for the SIMATIC S7-300 family, handling rapid traverse, creep, run right, and run left motion profiles for a single axis. It accepts incremental encoders (symmetrical or asymmetrical) via a 5 V differential RS-422 input, and also supports absolute encoders with SSI protocol — the telegram length is parameterizable to 13 or 25 bits. Eight digital inputs and eight digital outputs, each rated 400 mA per channel with short-circuit protection, handle the limit-switch and actuator interface on the machine side. ## Encoder interface and cable limits The incremental encoder input accepts A/B quadrature with a zero-mark signal (N), and the clock frequency for the SSI interface reaches 1.5 MHz. Maximum input frequency is 50 kHz at 25 m cable length, derating to 25 kHz at the full 100 m cable run — so a long cable on a fast axis costs you pulse resolution. For shielded encoder cables, the maximum length extends to 200 m when the input frequency is kept at or below 188 kHz — useful for remote encoder mounting in a mill environment. ## Power, environment, and lifecycle The module draws up to 350 mA from the 24 V DC field supply and 150 mA from the 5 V backplane bus, with a typical power loss of 7.9 W. ## Sourcing the 6ES7351-1AH02-0AE0 No official Siemens successor order code is listed for this module; the closest functional replacement in the S7-300 family would be the FM 350-1 or FM 350-2 counter modules, but they are not pin-compatible and require a wiring change.","metaTitle":"Siemens 6ES7351-1AH02-0AE0 FM 351 Positioning Module, EOL","metaDescription":"Siemens 6ES7351-1AH02-0AE0 FM 351 positioning module for SIMATIC S7-300. End-of-life (EOL) status.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"5 V":"Yes","24 V":"Yes","Max.":"70 °C","Min.":"-40 °C","Depth":"120 mm","Width":"80 mm","Height":"125 mm","Functions":"Rapid traverse, creep, run right, run left","Gray code":"Yes","Data signal":"DATA, notDATA","Clock signal":"CL, notCL","Input signal":"5 V difference signal (phys. RS 422)","2-Wire Sensor":"Yes","Input voltage":"24 V","For Signal \"0\"":"-3 to +5V","For Signal \"1\"":"+11 to +30V","Weight, approx.":"550 g","lifecycle_stage":"eol_hot","Power loss, typ.":"7.9 W","Rated value (DC)":"24 V","Zero mark signal":"N","Cable length, max.":"100 m","Trace mark signals":"A, B","For Signal \"1\", Min.":"UP - 0.8 V","For Signal \"1\", Typ.":"6 mA","Output current, max.":"400 mA; Per channel","Clock frequency, max.":"1.5 MHz","Input frequency, max.":"50 kHz; 50 kHz for 25 m cable length; 25 kHz for 100 m cable length","Absolute encoder (SSI)":"Yes","Number of digital inputs":"8","Required Front Connector":"1x 20-pin","Short-circuit protection":"Yes","Current consumption, max.":"350 mA","Number of digital outputs":"8","Cable length, shielded, max.":"200 m; At max. 188 kHz","from backplane bus 5 V DC, max.":"150 mA","Telegram length, parameterizable":"13 or 25 bit","Incremental encoder (symmetrical)":"Yes","Incremental encoder (asymmetrical)":"Yes","Potential separation digital inputs":"Yes","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Potential separation digital outputs":"Yes","For Signal \"0\" Residual Current, Max.":"0.5 mA","Permissible Quiescent Current (2-Wire Sensor), Max.":"2 mA; on signal \"0\", max. 2 mA; on signal \"1\", max. 6 mA","For Signal \"0\", Max. (Permissible Quiescent Current)":"2 mA","for signal \"1\" permissible range for 0 to 60 °C, max.":"600 mA; with UPmax","for signal \"1\" permissible range for 0 to 60 °C, min.":"5 mA; with UPmax"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,713.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/effd07df281caf32e7db73f3854872fe.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=406421&mlfb=6ES7351-1AH02-0AE0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7351-1AH02-0AE0/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum cable length for the FM 351?","answer":"Maximum unshielded cable length is 100 m; shielded encoder cable can run up to 200 m when the input frequency is at or below 188 kHz."},{"question":"Does the FM 351 support absolute encoders?","answer":"Yes, it supports absolute encoders with SSI protocol, parameterizable for 13 or 25 bit telegrams."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7351-1AH02-0AE0","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/6ES7351-1AH02-0AE0 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}}