{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7221-1BF32-0XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7221-1BF32-0XB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7221-1BF32-0XB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7221-1BF32-0XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1200 SM 1221 digital input module, 6ES7221-1BF32-0XB0, 8 digital inputs, 24 VDC, 75 mm depth, 45 mm width, 100 mm height, IP20.","salesMarkdown":"## 8-channel 24 VDC input module for the S7-1200 ecosystem The 6ES7221-1BF32-0XB0 is an 8-channel digital input module in the SIMATIC S7-1200 family, drawing 1.5 W typical from the backplane bus. It accepts 24 VDC nominal field signals, with a logic '1' threshold at 15 VDC / 2.5 mA minimum and a logic '0' threshold at 5 VDC / 1 mA — a wide hysteresis that rejects noise on long cable runs. ## Temperature envelope and mounting orientation Rated for -40 °C to 70 °C ambient, but the mounting orientation derates the upper limit: horizontal installation allows up to 60 °C, vertical installation caps at 50 °C. The lower end is -20 °C in either orientation — the -40 °C rating applies only to storage/transport. For a panel in an unheated enclosure or a freezer line, this module handles the cold side without a heater. The IP20 housing (plastic, 170 g) snaps onto a DIN rail and requires a front connector (ordered separately). Dimensions are 45 mm wide, 100 mm high, 75 mm deep — fits a standard S7-1200 slot without crowding adjacent modules. ## Cable length limits and diagnostic capability Unshielded cable runs up to 300 m; shielded runs up to 500 m. For a distributed I/O layout where sensors are 200+ m from the panel, the shielded limit gives headroom. The module supports parameterizable inputs, diagnostic alarms, and status readback — useful for commissioning a FAT where you need to verify each channel's state without a field device connected. Inputs are arranged in groups of 2, with a maximum of 8 inputs at 40 °C and 8 at 50 °C — no derating of channel count across the normal industrial ambient range. ## Regulatory approvals — global panel acceptance Carries cULus, CSA, CE, FM, KC, and marine approvals, plus RCM (formerly C-TICK). For a panel shipping to North America, the cULus mark avoids a separate agency review; for a shipboard installation, the marine approval covers Lloyd's / DNV-type environments. No separate UL 508 listing is stated, but the cULus mark implies component recognition for industrial control equipment.","metaTitle":"Siemens 6ES7221-1BF32-0XB0 Digital Input Module, 8 DI","metaDescription":"Siemens 6ES7221-1BF32-0XB0 digital input module, 8 channels, 24 VDC, -40 to 70 °C, current lifecycle. Quoted to order against BOM.","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":"75 mm","Width":"45 mm","cULus":"Yes","title":"6ES7221-1BF32-0XB0","Height":"100 mm","CE mark":"Yes","Plastic":"Yes","FM approval":"Yes","KC approval":"Yes","UL approval":"Yes","description":"SIMATIC S7-1200, Digital input SM 1221, 8 DI, 24 V DC, Sink/Source","CSA approval":"Yes","In Groups Of":"2","For Signal \"0\"":"5 V DC at 1 mA","For Signal \"1\"":"15 V DC at 2.5 mA","Shielded, Max.":"500 m","Marine approval":"Yes","Parameterizable":"Yes","Weight, approx.":"170 g","lifecycle_stage":"current","Diagnostic alarm":"Yes","Power loss, typ.":"1.5 W","Rated value (DC)":"24 V","Unshielded, Max.":"300 m","Fall height, max.":"0.3 m; five times, in product package","up to 40 °C, max.":"8","up to 50 °C, max.":"8","For Signal \"1\", Min.":"2.5 mA","For Signal \"1\", Typ.":"4 mA","RCM (formerly C-TICK)":"Yes","IP degree of protection":"IP20","Storage/transport, max.":"1 080 hPa","Storage/transport, min.":"660 hPa","For Status Of The Inputs":"Yes","Number of digital inputs":"8","Required Front Connector":"Yes","Vertical Installation, Max.":"50 °C","Vertical Installation, Min.":"-20 °C","Horizontal Installation, Max.":"60 °C","Horizontal Installation, Min.":"-20 °C","Permissible Temperature Change":"5°C to 55°C, 3°C / minute","from backplane bus 5 V DC, max.":"105 mA","Between The Channels, In Groups Of":"2","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","from load voltage L+ (without load), max.":"4 mA; per channel","Operation at 25 °C without condensation, max.":"95 %","Product Function / Supply Voltage For Transmitters":"Yes","For Signal \"0\", Max. (Permissible Quiescent Current)":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$88.90 – $216.32","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cf199f0edc80399207429cde38d15976.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=389391&mlfb=6ES7221-1BF32-0XB0"},"ai":{"faq":[{"question":"What is the maximum ambient temperature for this module in a vertical panel?","answer":"In vertical installation the maximum ambient temperature is 50 °C; horizontal installation allows up to 60 °C. The storage/transport range extends to 70 °C, but operating limits follow the orientation derating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7221-1BF32-0XB0","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/6ES7221-1BF32-0XB0 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}}