{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1FF00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1FF00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1FF00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1FF00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SM 321, 6ES7321-1FF00-0AA0, 8-channel digital input module, AC 120/230 V, optically isolated, for S7-300 rack.","salesMarkdown":"## 8 AC inputs for legacy S7-300 racks The Siemens 6ES7321-1FF00-0AA0 is an SM 321 digital input module providing 8 optically isolated channels rated for AC 120/230 V. Each channel accepts line-voltage AC signals directly — no external step-down transformer or interposing relay needed for 120 V or 230 V control circuits. ## Lifecycle: end-of-life, sourced to order The module mounts onto a DIN rail and connects to the rack backplane via the standard bus connector.","metaTitle":"Siemens 6ES7321-1FF00-0AA0 SM 321, 8×AC120/230V, obsolete","metaDescription":"Siemens SM 321 6ES7321-1FF00-0AA0 digital input module, 8 channels AC 120/230 V, optically isolated. EOL hot — sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Part #":"6ES7321-1FF00-0AA0","Weight":"0.12 kgs","Category":"PLCs and Accessories","Sub Category":"PLC Expansion Modules","Top Category":"PLCs & HMIs","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$102.87","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=329585&mlfb=6ES7321-1FF00-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1FF00-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for Siemens 6ES7321-1FF00-0AA0?","answer":"No official Siemens successor order code is recorded for the 6ES7321-1FF00-0AA0. For a like-for-like replacement, the later variant 6ES7321-1FF10-0AA0 (8×AC 120/230 V, optically isolated) is the closest functional match, but verify bus compatibility with your S7-300 CPU firmware revision before ordering."},{"question":"Can 6ES7321-1FF00-0AA0 be used with S7-300?","answer":"Yes, the 6ES7321-1FF00-0AA0 is an SM 321 module designed for the Siemens S7-300 programmable logic controller family. It mounts on the S7-300 DIN rail and communicates over the standard backplane bus."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1FF00-0AA0","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/6ES7321-1FF00-0AA0 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}}