{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1BL00-4AA1","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1BL00-4AA1","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1BL00-4AA1","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1BL00-4AA1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SM 321 digital input module, 6ES7321-1BL00-4AA1, 32 DC inputs, 24 V, 7 mA per channel, 40 mm width, DIN-rail mount.","salesMarkdown":"## 32-channel DC input module for S7-300 racks The Siemens 6ES7321-1BL00-4AA1 is a SM 321 digital input module with 32 channels, each accepting 24 VDC and drawing 7 mA at signal '1'. It snaps onto the S7-300 DIN rail and connects to the backplane bus via the standard 40-pin front connector. The module footprint is 40 mm wide by 125 mm high by 120 mm deep — it occupies one slot in the rack and leaves room for adjacent modules in a dense panel layout. ## Lifecycle status and sourcing reality Typical lead time is quoted at 1–10 working days from the point of order confirmation, though this depends on lot size and current channel stock. ## Electrical and thermal profile Each input sinks 7 mA at the '1' signal level — this is the load the field sensor or switch must drive. The total backplane current draw for all 32 channels at 24 VDC is well within the S7-300 rack power budget. Typical power loss is 6.5 W. This heat dissipates into the enclosure; for cabinets with multiple modules, the cumulative thermal load should be factored into the ventilation or cooling design.","metaTitle":"Siemens 6ES7321-1BL00-4AA1 SM 321 DI Module, 32 Inputs","metaDescription":"Siemens 6ES7321-1BL00-4AA1 SM 321 digital input module, 32 channels, 24 VDC, 7 mA per channel. EOL-hot lifecycle — sourced to order via independent","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"title":"6ES7321-1BL00-4AA1","Dimessions":"Width 40 mm x Height 125 mm x Depth 120 mm","description":"PLC Controller","Current Flow":"For signal \"1\" (7 mA)","PRoduct Type":"PLC Controller","Product Number":"6ES7321-1BL00-4AA1","Shipping Weight":"1.5 kg","lifecycle_stage":"eol_hot","Power loss, typ.":"6.5 W","Estimated Lead Time":"1 - 10 Working days.","Type of input voltage":"DC","Number of digital inputs":"32"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$254.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/610fd7acb3bb496c93e6b2b7726f4775.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I order 6ES7321-1BL00-4AA1 and check availability?","answer":"Submit an RFQ through this listing. Lead time is typically 1–10 working days after order confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1BL00-4AA1","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/6ES7321-1BL00-4AA1 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}}