{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7221-3AD30-0XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7221-3AD30-0XB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7221-3AD30-0XB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7221-3AD30-0XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1200 Signal Board SB 1221, 4 digital inputs, 5V DC, 200 kHz, current-sourcing, 38 x 62 x 21 mm.","salesMarkdown":"The Siemens 6ES7221-3AD30-0XB0 is a SIMATIC S7-1200 Signal Board SB 1221 — a 4-channel digital input module that mounts directly onto the S7-1200 CPU to add high-speed, current-sourcing inputs without consuming an additional rack slot or backplane connector. Rated for 5 V DC operation, it accepts current-sourcing signals (PNP) and switches at up to 200 kHz, making it suitable for counting, encoder feedback, or fast proximity sensor interfaces where the standard CPU inputs would be too slow. The module draws 40 mA from the 5 V DC backplane bus and dissipates 1 W typ., so it adds negligible thermal load inside a compact control cabinet. ## Signal thresholds and wiring constraints Signal '1' is detected between 0 V and (L+ minus 2.0 V DC), with a minimum input current of 5.1 mA and a typical draw of 15 mA per channel. Signal '0' is (L+ minus 1.0 V DC) up to L+, with a permissible quiescent current up to 2.2 mA. These thresholds are compatible with standard 5 V logic families and many 24 V DC sensors when properly scaled. Unshielded cable runs are limited to 50 m maximum; the manufacturer specifies shielded, twisted-pair cable for that full distance to maintain signal integrity at 200 kHz switching rates. ## Environmental limits and mounting Operating temperature range depends on mounting orientation: horizontal installation allows -20 °C to 60 °C; vertical installation derates the maximum to 50 °C. Maximum humidity at 25 °C without condensation is 95 %, and the module withstands a 0.3 m drop (five times, in its product package). Carries cULus, CE, UL, CSA, FM, KC, marine, and RCM (C-TICK) approvals — a broad certification set that covers North American, European, Korean, Australian, and maritime applications without additional agency review. The module is parameterizable via the TIA Portal engineering software, allowing input filter times and diagnostics to be configured per application.","metaTitle":"Siemens 6ES7221-3AD30-0XB0 SIMATIC S7-1200 SB 1221, 4 DI, 5V","metaDescription":"Siemens 6ES7221-3AD30-0XB0 SIMATIC S7-1200 SB 1221 digital input module. 4 current-sourcing inputs, 5V DC, 200kHz. cULus, CE, UL, CSA, FM, KC, marine approvals. Quoted to order.","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 1.0 V DC) ... L+ (2.2 ... 0 mA)","For Signal \"1\"":"0 V ... (L+ minus 2.0 V DC (20 ... 5.1 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)":"5 V","Fall height, max.":"0.3 m; five times, in product package","For Signal \"1\", Min.":"5.1 mA","For Signal \"1\", Typ.":"15 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)":"2.2 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$51.00 – $127.41","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d6fe285d818e3ddcea89c9474c6b2e91.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=393437&mlfb=6ES7221-3AD30-0XB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7221-3AD30-0XB0/alternatives.json"},"ai":{"faq":[{"question":"What is 6ES7221-3AD30-0XB0's maximum operating temperature?","answer":"The maximum operating temperature is 70 °C during storage/transport; for horizontal installation it is 60 °C, and for vertical installation it is 50 °C."},{"question":"What is 6ES7221-3AD30-0XB0's minimum operating temperature?","answer":"The minimum operating temperature is -40 °C during storage/transport; for both horizontal and vertical installation it is -20 °C."},{"question":"Where can I buy 6ES7221-3AD30-0XB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does this module carry?","answer":"The module carries cULus, CE, UL, CSA, FM, KC, marine, and RCM approvals, covering North American, European, Korean, Australian, and maritime regulatory jurisdictions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7221-3AD30-0XB0","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/6ES7221-3AD30-0XB0 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}}