{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-7TH00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-7TH00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-7TH00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7TH00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SM 321 digital input module, 6ES7321-7TH00-0AB0, 16 channels for NAMUR proximity sensors and 2-/3-/4-wire BEROs, 8.2 V / 18 V sensor supply, 40-pin front connector, end-of-life status.","salesMarkdown":"## NAMUR-rated input module for hazardous-area sensing The Siemens 6ES7321-7TH00-0AB0 is a 16-channel digital input module for the S7-300 family, specifically designed for NAMUR proximity sensors (2.1 to 7 mA signal range) and 2-/3-/4-wire BEROs, with an 8.2 V or 18 V sensor supply voltage selectable per group. Each channel provides wire-break and short-circuit detection (electronic), diagnostic alarms, and hardware interrupt capability — essential for monitoring sensor health in safety-instrumented or remote I/O applications where a broken wire must be flagged immediately. The module draws up to 190 mA from the 18 V sensor supply at 60 °C (110 mA at 40 °C) and 60 mA from the 8.2 V supply, plus 100 mA from the backplane bus via the 40-pin front connector. ## End-of-life sourcing reality Availability is limited to existing stock or surplus channels. No official Siemens successor order code is on record for this module. For a replacement, evaluate the S7-1200 or S7-1500 NAMUR-capable input modules, which require a different form factor and backplane. ## Sensor wiring and cable length limits Shielded cable length is limited to 400 m when using the 18 V sensor supply, and 200 m with the 8.2 V supply. Unshielded cable is not permitted — a critical detail for field wiring in electrically noisy environments. Input filtering is symmetrical: 2.5 to 3.5 ms on both rising and falling edges, which sets the minimum detectable pulse width for the downstream PLC logic. The module occupies a single slot (40 mm wide, 125 mm high, 120 mm deep) and requires a 40-pin front connector — verify the mating connector is on hand before installation. ## Operating temperature envelope Rated for 0 °C to 60 °C ambient, with full 16-channel operation sustained across the entire range — no derating above 40 °C. Typical power dissipation is 11 W, which must be considered in enclosure thermal calculations, especially when the module is grouped in a dense rack near other heat sources.","metaTitle":"Siemens 6ES7321-7TH00-0AB0","metaDescription":"Siemens 6ES7321-7TH00-0AB0 SM 321 digital input module, 16 channels for NAMUR sensors, 8.2V/18V supply. End-of-life status. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Max.":"60 °C","Min.":"0 °C","Depth":"120 mm","Width":"40 mm","Alarms":"Yes","Height":"125 mm","Wire-break":"Yes","Rated value":"190 mA; at 18V: 190mA, at 8.2V: 60mA","Shielded, Max.":"400 m; max. 200m with 8.2 V sensor, max. 400m with 18 V sensor","lifecycle_stage":"eol_hot","Diagnostic alarm":"Yes","Power loss, typ.":"11 W","Rated value (DC)":"8.2 V; 8.2V/18V","Unshielded, Max.":"Not permitted","Number of outputs":"4","Hardware interrupt":"Yes","up to 40 °C, max.":"16","up to 60 °C, max.":"16","At \"0\" To \"1\", Max.":"3.5 ms","At \"0\" To \"1\", Min.":"2.5 ms","At \"1\" To \"0\", Max.":"3.5 ms","At \"1\" To \"0\", Min.":"2.5 ms","Between The Channels":"Yes","Diagnostics function":"Yes","For Signal \"0\", Min.":"0.35 mA","For Signal \"1\", Typ.":"10 mA; for NAMUR: 2.1 to 7 mA, for 10k ohm/47k ohm contact: typical 10mA, for 4 wire BEROs: typical 10 mA","Group error SF (red)":"Yes","Isolation tested with":"600 V DC","Type of input voltage":"DC","Type of output voltage":"1Vs1/2Vs1: 18 V, 1Vs2/2Vs2: 8.2 V","Number of digital inputs":"16","Required Front Connector":"1x 40-pin","Short-circuit protection":"Yes; Electronic","Encoder supply Vs (green)":"Yes","Additional (Redundant) Feed":"No","Reverse polarity protection":"Yes","Permissible Range, Upper Limit":"Up to 60 degree: at 18V: 0 to 110mA, at 8.2V: 0 to 60mA; Up to 40 degree: at 18V: 0 to 190mA, at 8.2V: 0 to 60mA","Diagnostic information readable":"Yes","from backplane bus 5 V DC, max.":"100 mA","Between The Channels, In Groups Of":"8","Between The Channels And Backplane Bus":"Yes","Status indicator digital input (green)":"Yes","from load voltage L+ (without load), max.":"100 mA","For Signal \"0\", Max. (Permissible Quiescent Current)":"1.2 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$836.93 – $1,265.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/44b412c536fe577090455c86119c92fb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=162726&mlfb=6ES7321-7TH00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7TH00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"Does 6ES7321-7TH00-0AB0 work with NAMUR encoders?","answer":"Yes, it supports NAMUR proximity sensors with a signal range of 2.1 to 7 mA, plus 10 kΩ / 47 kΩ mechanical contacts and 4-wire BEROs at a typical 10 mA signal current. The sensor supply is selectable between 8.2 V and 18 V per group."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-7TH00-0AB0","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/6ES7321-7TH00-0AB0 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}}