{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1CH00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1CH00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1CH00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1CH00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SM 321 digital input module, 6ES7321-1CH00-0AA0, 16 inputs, 24-48 V AC/DC, 40-pin front connector, EOL hot lifecycle stage.","salesMarkdown":"## What this module does in the rack The 6ES7321-1CH00-0AA0 is a 16-channel digital input module for the S7-300 system, accepting both AC and DC signals from 24 V to 48 V. It reads field devices like limit switches, pushbuttons, and proximity sensors, and passes the status to the CPU via the backplane bus. Each channel is isolated from the backplane by an optocoupler, with 1500 V AC isolation tested between channels and the bus. This lets you mix field supply voltages on adjacent channels without coupling ground loops. ## Signal thresholds and wiring constraints The module recognizes a signal '0' from -5 V AC to +5 V AC, and a signal '1' from 14 V AC to 60 V AC. The input current at signal '1' is typically 2.7 mA. This wide hysteresis rejects noise on long cable runs — unshielded cable up to 600 m, shielded up to 1000 m. Input delay is fixed at 16 ms for both on-to-off and off-to-on transitions — not parameterizable. The module draws 100 mA max from the 5 V DC backplane bus. Power dissipation is 1.5 W at 24 V supply, rising to 2.8 W at 48 V. It supports 2-wire proximity sensors, with a max permissible quiescent current of 1 mA. The 40-pin front connector is required and sold separately — the module ships without one.","metaTitle":"Siemens 6ES7321-1CH00-0AA0 Digital Input Module, 16 Ch AC/DC","metaDescription":"Siemens 6ES7321-1CH00-0AA0 SM 321 digital input module, 16 inputs, 24-48 V AC/DC, EOL hot stage. Optocoupler isolation, 1500 V AC tested.","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\"":"-5V AC to +5V AC","For Signal \"1\"":"14V AC to 60V AC","Shielded, Max.":"1 000 m","Parameterizable":"No","Weight, approx.":"260 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"No","Power loss, typ.":"1.5 W; at 24 V; 2,8 W at 48 V","Rated value (AC)":"24 V; 24 V AC or 48 V AC (0 ... 63 Hz)","Rated value (DC)":"24 V; DC 24 or 48 V","Unshielded, Max.":"600 m","Hardware interrupt":"No","up to 40 °C, max.":"16","up to 60 °C, max.":"16","At \"0\" To \"1\", Max.":"16 ms","At \"0\" To \"1\", Min.":"16 ms","At \"1\" To \"0\", Max.":"16 ms","Between The Channels":"Yes","Diagnostics function":"No","For Signal \"0\", Min.":"-1 mA","For Signal \"1\", Typ.":"2.7 mA","Group error SF (red)":"No","Isolation tested with":"1 500 V AC","Type of input voltage":"AC/DC","Number of digital inputs":"16","Required Front Connector":"40-pin","from backplane bus 5 V DC, max.":"100 mA","Between The Channels, In Groups Of":"1","permissible range, lower limit (AC)":"24 V","permissible range, lower limit (DC)":"24 V","permissible range, upper limit (AC)":"48 V","permissible range, upper limit (DC)":"48 V","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes","Permissible Quiescent Current (2-Wire Sensor), Max.":"1 mA","For Signal \"0\", Max. (Permissible Quiescent Current)":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$323.01 – $492.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=247475&mlfb=6ES7321-1CH00-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1CH00-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 6ES7321-1CH00-0AA0 and check current price?","answer":"The 6ES7321-1CH00-0AA0 is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — stock levels and price are confirmed at quote time. No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1CH00-0AA0","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/6ES7321-1CH00-0AA0 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}}