{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-7RD00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-7RD00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-7RD00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7RD00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300, digital input module SM 321, 4 NAMUR inputs, Ex(i), 24V DC, 120mm depth.","salesMarkdown":"## Integration Details The 6ES7321-7RD00-0AB0: 40 mm wide, 125 mm tall, 120 mm deep. Requires 20-pin front connector (not included). Channel-to-channel isolation: 60 V DC / 30 V AC in the hazardous area, 400 V DC / 250 V AC outside it. The module also isolates between the channels and the backplane bus – no ground loops from the Ex side to the controller.","metaTitle":"Siemens 6ES7321-7RD00-0AB0 4-Input NAMUR Module, Ex(i)","metaDescription":"End-of-life Siemens 6ES7321-7RD00-0AB0 digital input module. 4 NAMUR inputs, ATEX/FM Zone 2, 24V DC, 120mm depth. 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","Depth":"120 mm","Width":"40 mm","Height":"125 mm","FM marking":"Class II, Division 2, Group A, B, C, D T4","ATEX marking":"ATEX II 3 G (2) GD Ex nA [ib Gb] [ib IIIC Db] IIC T4 Gc","NAMUR encoder":"Yes; Two-wire connection","Parameterizable":"Yes; 0.1 / 0.5 / 3 / 15 / 20 ms (plus 0.25 ms preparation time)","Test number PTB":"Ex-96.D.2094X","Weight, approx.":"230 g","lifecycle_stage":"eol_hot","Power loss, typ.":"1.1 W","Rated value (DC)":"8.2 V; from internal power circuit supply","Unshielded, Max.":"200 m","On Wire-Break, Max.":"0.1 mA","Between The Channels":"Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area","Diagnostics function":"Yes","For Signal \"0\", Max.":"1.2 mA","For Signal \"0\", Min.":"0.35 mA","For Signal \"1\", Max.":"7 mA","For Signal \"1\", Min.":"2.1 mA","Group error SF (red)":"Yes","Type of input voltage":"DC","Number of NAMUR inputs":"4","On Short-Circuit, Max.":"8.5 mA","Type of output voltage":"via the inputs","Po (power output), max.":"33.7 mW","Number of digital inputs":"4","Required Front Connector":"20-pin","Uo (no-load voltage), max.":"10 V","Module for Ex(i) protection":"Yes","Reverse polarity protection":"Yes","Channel fault indicator F (red)":"Yes","Diagnostic information readable":"Yes","from backplane bus 5 V DC, max.":"80 mA","Io (short-circuit current), max.":"14.1 mA","Between The Channels, In Groups Of":"1","Between The Channels And Backplane Bus":"Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area","Status indicator digital input (green)":"Yes","Between the channels and load voltage L+":"Yes; 60 V DC/30 V AC when used in the hazardous area; 400 V DC/250 V AC when used in NON-hazardous area","Co (permissible external capacity), max.":"3 µF","from load voltage L+ (without load), max.":"50 mA","Lo (permissible external inductivity), max.":"100 mH","Input frequency (with a time delay of 0.1 ms), max.":"2 kHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$415.29 – $822.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/862c4b93fab9e4dd3cef6d6af051e310.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=304701&mlfb=6ES7321-7RD00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7RD00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What certifications does it carry?","answer":"It has ATEX II 3 G (2) GD Ex nA [ib Gb] [ib IIIC Db] IIC T4 Gc and FM Class II, Division 2, Groups A, B, C, D T4. The PTB test number is Ex-96.D.2094X."},{"question":"Does it require any special connector?","answer":"Yes, it requires a 20-pin front connector (Siemens order code 6ES7392-1AJ00-0AA0 or equivalent). That connector is not included with the module."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-7RD00-0AB0","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/6ES7321-7RD00-0AB0 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}}