{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6AG1221-1BF32-4XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6AG1221-1BF32-4XB0","canonicalUrl":"https://aoctrl.com/siemens/6AG1221-1BF32-4XB0","factsUrl":"https://aoctrl.com/api/mcp/products/6AG1221-1BF32-4XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1200 digital input module, 6AG1221-1BF32-4XB0, 8 channels, 24 V DC, 45 x 100 x 75 mm, IP20, plastic enclosure.","salesMarkdown":"## 8-channel 24 V DC sink input — temperature-rated for cabinet extremes The 6AG1221-1BF32-4XB0: Eight digital inputs, each sinking 2.5 mA minimum at 15 V DC for a logic '1', with the supply rail permitted to sag to 20.4 V DC before the channel drops out. Rated for the full eight inputs simultaneously up to 50 °C ambient — no derating required within that envelope — and the plastic IP20 housing fits a 45 mm wide DIN-rail footprint. The module draws 105 mA max from the backplane 5 V bus and 4 mA per channel from the load supply; total dissipation is 1.5 W typical, so thermal rise inside a dense cabinet stays manageable. ## Wiring and diagnostics — parameterisable with per-channel status All eight inputs are parameterisable, with diagnostic alarm and supply-voltage monitoring built in — the module reports a missing L+ before the PLC logic sees a false '0'. Unshielded cable runs up to 300 m and shielded runs up to 500 m are allowed; the module requires a front connector (sold separately) and includes a maintenance-friendly design for field swap-out.","metaTitle":"Siemens 6AG1221-1BF32-4XB0 Digital Input Module, 8 Ch","metaDescription":"Siemens 6AG1221-1BF32-4XB0 digital input module, 8 channels, 24 V DC, -40 to 70 °C, current production. Quoted to order against your 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","title":"6AG1221-1BF32-4XB0","Height":"100 mm","Plastic":"Yes","description":"SIPLUS S7-1200 SM 1221 8DI based on 6ES7221-1BF32-0XB0 with conformal coating, -20…+60 °C, digital input 8 DI, 24 V DC, sink/source","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","For Maintenance":"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","Diagnostics function":"Yes","For Signal \"1\", Min.":"2.5 mA","For Signal \"1\", Typ.":"4 mA","At cold restart, min.":"0 °C","IP degree of protection":"IP20","For Status Of The Inputs":"Yes","Number of digital inputs":"8","Required Front Connector":"Yes","Monitoring the supply voltage":"Yes","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","Installation altitude above sea level, max.":"5 000 m","Protection against fouling acc. to EN 60664-3":"Yes; Type 1 protection","Product Function / Supply Voltage For Transmitters":"Yes","Ambient air temperature-barometric pressure-altitude":"Tmin ... Tmax at 1 140 hPa ... 795 hPa (-1 000 m ... +2 000 m) // Tmin ... (Tmax - 10 K) at 795 hPa ... 658 hPa (+2 000 m ... +3 500 m) // Tmin ... (Tmax -20 K) at 658 hPa ... 540 hPa (+3 500 m ... +5 000 m)","For Signal \"0\", Max. (Permissible Quiescent Current)":"1 mA","Resistant to commercially available coolants and lubricants":"Yes","Environmental conditions for process, measuring and control systems acc. to ANSI/ISA-71.04":"Yes; Level GX group A/B (excluding trichlorethylene; harmful gas concentrations up to the limits of EN 60721-3-3 class 3C4 permissible); level LC3 (salt spray) and level LB3 (oil)","Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies according to IPC-CC-830A":"Yes; Conformal coating, Class A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$315.20","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4f7ed015779467330d6abb3ecc9e2408.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=351156&mlfb=6AG1221-1BF32-4XB0"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6AG1221-1BF32-4XB0","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/6AG1221-1BF32-4XB0 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}}