{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1FF10-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1FF10-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1FF10-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1FF10-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1FF10-0AA0, 8 isolated AC inputs, 120/230 V AC, 40-pin front connector, end-of-life.","salesMarkdown":"## 8 AC inputs with channel isolation The Siemens 6ES7321-1FF10-0AA0 is a SIMATIC S7-300 SM 321 digital input module providing 8 isolated AC inputs rated for 120/230 V AC (47–63 Hz). Each input is individually isolated in groups of 1 via optocoupler, with a tested isolation of 1500 V AC between channels and the backplane bus — meaning a fault on one channel stays contained and won't pull down the rack's 5 V DC logic supply. ## Signal thresholds and wiring The module reads a signal \"1\" between 79 V and 264 V AC, drawing typically 7.5 mA at 120 V and 17.3 mA at 230 V. Signal \"0\" is 0 to 40 V AC. The 25 ms max transition time (both 0→1 and 1→0) is fixed — no parameterisable filter — so the PLC scan cycle must accommodate this latency for fast AC line monitoring. Wiring uses a 40-pin front connector (required, not included). Shielded cable runs up to 1000 m; unshielded up to 600 m. The module accepts 2-wire sensors with a permissible quiescent current up to 2 mA. Status indicators (green LEDs) per channel give immediate visual feedback during commissioning.","metaTitle":"Siemens 6ES7321-1FF10-0AA0 SM 321, 8 DI, 120/230 V AC","metaDescription":"Siemens 6ES7321-1FF10-0AA0 SIMATIC S7-300 SM 321 digital input module, 8 isolated AC inputs, 120/230 V AC. End-of-life — sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Depth":"120 mm","Width":"40 mm","Alarms":"No","Height":"125 mm","2-Wire Sensor":"Yes","For Signal \"0\"":"0 to 40V","For Signal \"1\"":"79 to 264V","Shielded, Max.":"1 000 m","Parameterizable":"No","Weight, approx.":"240 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"No","Power loss, typ.":"4.9 W","Rated value (AC)":"120 V; 120/230 V AC (47 ... 63 Hz)","Unshielded, Max.":"600 m","Hardware interrupt":"No","up to 40 °C, max.":"8","up to 60 °C, max.":"8","At \"0\" To \"1\", Max.":"25 ms","At \"1\" To \"0\", Max.":"25 ms","Between The Channels":"Yes","Diagnostics function":"No","For Signal \"1\", Typ.":"7.5 mA; (120 V); 17.3 mA (230 V)","Group error SF (red)":"No","Isolation tested with":"1 500 V AC","Type of input voltage":"AC","Number of digital inputs":"8","Required Front Connector":"40-pin","from backplane bus 5 V DC, max.":"100 mA","Between The Channels, In Groups Of":"1","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes","Permissible Quiescent Current (2-Wire Sensor), Max.":"2 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$201.93 – $314.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/eeab03030c309d31ed1e2b8dc445d93b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=259266&mlfb=6ES7321-1FF10-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1FF10-0AA0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1FF10-0AA0","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/6ES7321-1FF10-0AA0 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}}