{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7221-3BF50-0XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7221-3BF50-0XB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7221-3BF50-0XB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7221-3BF50-0XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SB 1221 digital input module, SIMATIC S7-1200 G2, 8 digital inputs 24 V DC sink/source, 100 kHz switching frequency, 1 piece.","salesMarkdown":"## What this module does that a standard DI can't The 6ES7221-3BF50-0XB0 is an SB 1221 signal board for the SIMATIC S7-1200 G2 CPU — it plugs directly into the front of the controller, not the rack, saving a slot for other I/O. It gives you 8 digital inputs, each configurable as sink or source at 24 V DC, with a 100 kHz switching frequency. That 100 kHz rate means it catches fast pulses from encoders, flow meters, or proximity sensors that a standard 10–20 kHz input would miss. The input wiring is straightforward: 24 V DC common, sink or source per channel, no polarity fuss. The 100 kHz limit applies per channel — if you're counting encoder edges at line speed, budget the scan cycle on the CPU side to avoid missing counts. ## Lifecycle and compliance — what the documentation says Packaged as a single piece, dimensions 82 x 34 x 79 mm — small enough to keep a few on the shelf as a critical spare for a line with S7-1200 G2 controllers.","metaTitle":"Siemens 6ES7221-3BF50-0XB0 SB 1221 Digital Input Module","metaDescription":"Siemens 6ES7221-3BF50-0XB0 SB 1221 digital input module, 8 DI 24 V DC sink/source at 100 kHz. Active production, RoHS compliant. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Digital Input Modules"],"specifications":{"title":"6ES7221-3BF50-0XB0","Group Code":"R132","description":"SIMATIC S7-1200 G2: SB 1221 digital input, 8 DI 100 kHz; inputs: 8x DI 24 V DC sink/source, 100 kHz","Product Group":"4508","Product class":"A: Standard product which is a stock item could be returned within the returns guidelines/period.","Quantity Unit":"1 Piece","Product Family":"SB 1221 digital input modules","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : EAR99H","Packaging dimensions (L x W x H)":"82.00 x 34.00 x 79.00 mm","Compliance with the substance restrictions according to RoHS directive":"Since: 22-01-25","REACH Art. 33 Duty to inform according to the current list of candidates":"Lead monoxide (lead oxide) CAS-No. 1317-36-8 > 0,1 % (w / w)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3a062c1ed2eb23476448e36b05c59df9.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/6ES7221-3BF50-0XB0?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 6ES7221-3BF50-0XB0?","answer":"RoHS compliant since January 2025. REACH Article 33 disclosure includes lead monoxide above 0.1% w/w. Export control classification is AL: N / ECCN: EAR99H."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7221-3BF50-0XB0","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/6ES7221-3BF50-0XB0 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}}