{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1EL00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1EL00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1EL00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1EL00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1EL00-0AA0, 32 isolated 120 V AC inputs, 40-pin front connector, end-of-life.","salesMarkdown":"## 32-channel 120 V AC input module — EOL status The 6ES7321-1EL00-0AA0: Each channel accepts a signal \"1\" threshold of 74 to 132 V AC with a typical input current of 21 mA, and a signal \"0\" threshold of 0 to 20 V AC. The module is not parameterizable and lacks diagnostic or alarm functions — it is a fixed-configuration input block. When specifying a replacement, the 40-pin front connector requirement and the 120 V AC input type are the critical fit constraints that any alternative must match. The module occupies a standard S7-300 slot: 40 mm wide, 125 mm high, 120 mm deep. It requires a 40-pin front connector for field wiring — the connector is ordered separately and must be specified to match the screw- or spring-clamp termination preference. Isolation between channels and the backplane bus is provided by optocouplers, tested at 2500 V DC. Channels are grouped in banks of 8 with no channel-to-channel isolation within a group — this grouping matters when mixing phases or commons across the input set. The module draws 16 mA max from the 5 V DC backplane bus and dissipates 4 W typical. Status indication per channel (green LED) is provided, but no group-error or diagnostic LEDs are fitted.","metaTitle":"Siemens 6ES7321-1EL00-0AA0 SM 321, 32 DI, 120 V AC","metaDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 32 isolated AC inputs, 120 V AC, 40-pin front connector. End-of-life (EOL) — 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 20V","For Signal \"1\"":"74 to 132V","Shielded, Max.":"1 000 m","Parameterizable":"No","Weight, approx.":"300 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"No","Power loss, typ.":"4 W","Rated value (AC)":"120 V; 47 ... 63 Hz","Unshielded, Max.":"600 m","Hardware interrupt":"No","up to 40 °C, max.":"32","up to 60 °C, max.":"24","At \"0\" To \"1\", Max.":"15 ms","At \"1\" To \"0\", Max.":"25 ms","Between The Channels":"No","Diagnostics function":"No","For Signal \"1\", Typ.":"21 mA","Group error SF (red)":"No","Isolation tested with":"2 500 V DC","Type of input voltage":"AC","Number of digital inputs":"32","Required Front Connector":"40-pin","from backplane bus 5 V DC, max.":"16 mA","Between The Channels, In Groups Of":"8","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes; per channel","Permissible Quiescent Current (2-Wire Sensor), Max.":"4 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$621.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=338302&mlfb=6ES7321-1EL00-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1EL00-0AA0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1EL00-0AA0","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/6ES7321-1EL00-0AA0 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}}