{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1BL00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1BL00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1BL00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1BL00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1BL00-0AA0, 32 isolated digital inputs, 24 V DC, 40-pin front connector.","salesMarkdown":"The 6ES7321-1BL00-0AA0 is a SIMATIC S7-300 SM 321 digital input module offering 32 isolated inputs rated at 24 V DC, terminated through a single 40-pin front connector. It accepts 2-wire proximity sensors and provides optocoupler isolation between the channels and the backplane bus. The module occupies a standard 40 mm wide slot and draws 15 mA from the 5 V backplane supply plus 6.5 W from the 24 V load circuit. ## Input characteristics and wiring Each input channel has a nominal input current of 7 mA at 24 V DC. The signal \"1\" threshold is 13 to 30 V, signal \"0\" is -30 to +5 V. Input filtering is fixed: the transition from 0 to 1 or 1 to 0 takes between 1.2 ms and 4.8 ms, with no parameterization available. The module supports 2-wire sensors with a permissible quiescent current up to 1.5 mA. The 32 inputs are electrically isolated from the backplane bus via optocouplers, and the channel groups are isolated from each other in groups of 16. The module does not provide diagnostics, alarms, or hardware interrupts. ## Temperature derating and cable lengths The module can drive all 32 inputs simultaneously up to 40 °C ambient. Above that, derating applies: at 60 °C only 16 inputs may be active. Unshielded cable runs up to 600 m are permitted; shielded runs up to 1 000 m.","metaTitle":"Siemens 6ES7321-1BL00-0AA0 SM 321 Digital Input Module, 32 D","metaDescription":"SIMATIC S7-300 SM 321 digital input module, 32 channels, 24 V DC, 40-pin front connector. EOL phase-out; sourced to order against RFQ. 120 mm depth, 40 mm width.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Depth":"120 mm","Width":"40 mm","title":"6ES7321-1BL00-0AA0","Alarms":"No","Height":"125 mm","description":"SIMATIC S7-300, Digital input SM 321, Isolated 32 DI, 24 V DC, 1x 40-pole","2-Wire Sensor":"Yes","For Signal \"0\"":"-30 to +5 V","For Signal \"1\"":"13 to 30V","Shielded, Max.":"1 000 m","Parameterizable":"No","Weight, approx.":"260 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"No","Power loss, typ.":"6.5 W","Rated value (DC)":"24 V","Unshielded, Max.":"600 m","Hardware interrupt":"No","up to 40 °C, max.":"32","up to 60 °C, max.":"16","At \"0\" To \"1\", Max.":"4.8 ms","At \"0\" To \"1\", Min.":"1.2 ms","At \"1\" To \"0\", Max.":"4.8 ms","At \"1\" To \"0\", Min.":"1.2 ms","Between The Channels":"No","Diagnostics function":"No","For Signal \"1\", Typ.":"7 mA","Isolation tested with":"500 V DC","Type of input voltage":"DC","Number of digital inputs":"32","Required Front Connector":"40-pin","from backplane bus 5 V DC, max.":"15 mA","Between The Channels, In Groups Of":"16","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes","Permissible Quiescent Current (2-Wire Sensor), Max.":"1.5 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$15.02","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77895b6dc9e04e6dcc8fe6cf5130d139.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=390860&mlfb=6ES7321-1BL00-0AA0"},"ai":{"faq":[{"question":"Will 6ES7321-1BL00-0AA0 drop into a panel specified around 6ES7314-1AF10-0AB0 without rewiring?","answer":"No. The 6ES7314-1AF10-0AB0 is a CPU module, not an I/O module. It occupies the same 40 mm wide slot in an S7-300 rack but serves a completely different function. A direct swap is not possible."},{"question":"What is the maximum cable length for the inputs?","answer":"Unshielded cable: 600 m. Shielded cable: 1 000 m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1BL00-0AA0","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/6ES7321-1BL00-0AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}