{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-7EH00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-7EH00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-7EH00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7EH00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-7EH00-0AB0, 16 DI, 24-125V DC, wire-break diagnostics, parameterizable input delay, end-of-life status.","salesMarkdown":"The 6ES7321-7EH00-0AB0: Key differentiator: per-channel wire-break detection triggers when the sensor current drops below 1 mA. That’s a rare feature on a S7-300 input module — saves hours of chasing intermittent faults on a 2-wire prox or limit switch. Input filter is parameterizable in five steps from 0.1 ms to 20 ms, giving flexibility between noise immunity and scan-rate. Diagnostic alarm and hardware interrupt are also configurable, so you can map faults directly into the CPU OB. ## Integration Notes Single-width S7-300 module: 40 mm wide, 125 mm tall, 120 mm deep. Mounts on any S7-300 rail. Requires a 40-pin front connector (sold separately). Backplane draw is 90 mA at 5 V DC — verify CPU power budget. Inputs isolated from backplane via optocouplers tested to 3 500 V DC; no channel-to-channel isolation — all 16 share a common group. Wire unshielded sensors up to 600 m, shielded up to 1 000 m. Supports 2-wire sensors with a permissible quiescent current up to 1 mA. For signal '1' the typical draw is 3.5 mA at 24 V. The nominal 24 V DC supply can range from 24 V to 125 V DC with reverse polarity protection.","metaTitle":"Siemens 6ES7321-7EH00-0AB0 SM 321 DI, 16x 24-125V DC","metaDescription":"End-of-life Siemens 6ES7321-7EH00-0AB0 SM 321 digital input module. 16 DI, 24-125V DC, wire-break diagnostics. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Max.":"60 °C","Min.":"0 °C","Depth":"120 mm","Width":"40 mm","Height":"125 mm","Wire-break":"Yes; I < 1 mA","2-Wire Sensor":"Yes","For Signal \"0\"":"-146 to 5V","For Signal \"1\"":"15 to 146V","Shielded, Max.":"1 000 m","Parameterizable":"Yes; 0.1 / 0.5 / 3 / 15 / 20 ms","Weight, approx.":"200 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"Yes; Parameterizable","Power loss, typ.":"2 W; V_in = 24 V DC","Rated value (DC)":"24 V; 24 V DC to 125 V DC","Unshielded, Max.":"600 m","Hardware interrupt":"Yes; Parameterizable","up to 40 °C, max.":"16; V_in = 100 V DC","up to 60 °C, max.":"16; V_in = 100 V DC","Between The Channels":"No","Diagnostics function":"Yes; Parameterizable","For Signal \"1\", Typ.":"3.5 mA","Group error SF (red)":"Yes","Isolation tested with":"3 500 V DC","Number of digital inputs":"16","Required Front Connector":"1x 40-pin","Reverse polarity protection":"Yes","from backplane bus 5 V DC, max.":"90 mA","Between The Channels, In Groups Of":"16","permissible range, lower limit (DC)":"24 V","permissible range, upper limit (DC)":"125 V","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes","Permissible Quiescent Current (2-Wire Sensor), Max.":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$609.60 – $920.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=396704&mlfb=6ES7321-7EH00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7EH00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum operating temperature for this module?","answer":"Rated for 0 °C to 60 °C ambient."},{"question":"Does the 6GK7343-5FA01-0XE0 serve as a functional replacement?","answer":"No. The 6GK7343-5FA01-0XE0 is a PROFIBUS communications module, not a digital input module. It will not fit the same I/O slot or perform the same function."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-7EH00-0AB0","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/6ES7321-7EH00-0AB0 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}}