{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7221-3BD30-0XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7221-3BD30-0XB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7221-3BD30-0XB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7221-3BD30-0XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1200, Digital input SB 1221, 4 DI, 24 V DC 200 kHz, Sourcing input, 6ES7221-3BD30-0XB0.","salesMarkdown":"The Siemens 6ES7221-3BD30-0XB0 is a SIMATIC S7-1200 signal board (SB 1221) providing 4 digital inputs, 24 V DC, current-sourcing type, with a 200 kHz switching frequency. It draws 40 mA from the 5 V DC backplane bus and dissipates 1 W typical. The 200 kHz per-channel input rate means this board is intended for high-speed counting or pulse measurement — not general-purpose pushbutton or limit-switch sensing. The 24 V DC sourcing input type expects the load to supply the current; verify your sensor outputs are sourcing-compatible (PNP). Signal \"1\" is detected from 0 V up to (L+ minus 10 V DC), with a minimum current of 2.9 mA and typical 7 mA. Signal \"0\" spans (L+ minus 5 V DC) up to L+, with a permissible quiescent current up to 1.4 mA. This gives a clean threshold window for industrial noise immunity. The board measures 38 mm wide, 62 mm high, 21 mm deep — it clips onto the S7-1200 CPU front panel, not a DIN rail. No additional panel space is consumed. Minimum for both orientations is -20 °C. The wider storage range covers transport conditions. Maximum unshielded cable length is 50 m; use shielded twisted pair for runs approaching that limit. Carries cULus, CE, UL, CSA, FM, KC, marine, and RCM (formerly C-TICK) approvals — covering North American, European, Korean, and maritime regulatory jurisdictions.","metaTitle":"Siemens 6ES7221-3BD30-0XB0 SIMATIC S7-1200, 4 DI, 24 V DC, 2","metaDescription":"Siemens 6ES7221-3BD30-0XB0 SIMATIC S7-1200 digital input SB 1221, 4 current-sourcing inputs, 24 V DC, 200 kHz. Active production. cULus, CE, UL, CSA, FM, KC, marine approvals. Sour","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Digital Input Modules"],"specifications":{"Max.":"70 °C","Min.":"-40 °C","Depth":"21 mm","Width":"38 mm","cULus":"Yes","Height":"62 mm","CE mark":"Yes","Plastic":"Yes","FM approval":"Yes","KC approval":"Yes","UL approval":"Yes","CSA approval":"Yes","In Groups Of":"4","For Signal \"0\"":"(L+ minus 5.0 V DC) ... L+ (1.4 ... 0 mA)","For Signal \"1\"":"0 V ... (L+ minus 10 V DC (10 ... 2.9 mA))","Shielded, Max.":"50 m; shielded, twisted pair","Marine approval":"Yes","Parameterizable":"Yes","Weight, approx.":"35 g","lifecycle_stage":"current","Power loss, typ.":"1 W","Rated value (DC)":"24 V","Fall height, max.":"0.3 m; five times, in product package","For Signal \"1\", Min.":"2.9 mA","For Signal \"1\", Typ.":"7 mA","RCM (formerly C-TICK)":"Yes","Type of input voltage":"DC","Storage/transport, max.":"1 080 hPa","Storage/transport, min.":"660 hPa","For Status Of The Inputs":"Yes","Number of digital inputs":"4; Current-sourcing","Vertical Installation, Max.":"50 °C","Vertical Installation, Min.":"-20 °C","Horizontal Installation, Max.":"60 °C","Horizontal Installation, Min.":"-20 °C","from backplane bus 5 V DC, typ.":"40 mA","Operation at 25 °C without condensation, max.":"95 %","For Signal \"0\", Max. (Permissible Quiescent Current)":"1.4 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$52.07 – $129.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4cf5f0006fdb1789227430fe88280ace.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=377115&mlfb=6ES7221-3BD30-0XB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7221-3BD30-0XB0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 6ES7221-1BF32-0XB0?","answer":"The 6ES7221-1BF32-0XB0 is a later S7-1200 digital input module (6ES7221-1BF32-0XB0) with 8 inputs and 24 V DC, but it is a different form factor (signal module, not signal board) and does not drop into the same CPU front-panel slot without rewiring. The 6ES7221-3BD30-0XB0 is a signal board (SB 1221) that mounts directly on the CPU; the 1BF32 is a signal module that requires its own DIN-rail mounting and bus connector. They are not form-fit interchangeable."},{"question":"What is the maximum operating temperature?","answer":"70 °C ambient, with derated limits for vertical (50 °C) and horizontal (60 °C) installation."},{"question":"What is the minimum operating temperature?","answer":"-40 °C ambient; minimum for both vertical and horizontal installation is -20 °C."},{"question":"What compliance documentation is available?","answer":"The module carries cULus, CE, UL, CSA, FM, KC, marine, and RCM approvals. Specific RoHS/REACH declarations are typically included in the manufacturer's documentation package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7221-3BD30-0XB0","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/6ES7221-3BD30-0XB0 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}}