{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7221-1EF22-0XA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7221-1EF22-0XA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7221-1EF22-0XA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7221-1EF22-0XA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-200 EM 221 digital input module, 6ES7221-1EF22-0XA0, 8 isolated AC inputs, 120/230 V AC, 62 mm depth, plug-in terminals.","salesMarkdown":"## Eight AC inputs with per-group isolation The 6ES7221-1EF22-0XA0 is a SIMATIC S7-200 EM 221 expansion module packing eight digital inputs rated for 220/230 V AC (47–63 Hz). Each input is isolated by optocoupler, and the channels are grouped into eight separate isolation groups — one per channel — so a fault on one input won't drag down its neighbor. Signal thresholds are set for AC line levels: a logic \"0\" sits at up to 20 V AC, and a logic \"1\" kicks in at 79 V AC or more with a typical draw of 2.5 mA per input. The transition time from 0 to 1 maxes out at 15 ms, which matters if you're counting fast pulses off a proximity switch. ## Cable runs and power budget Maximum cable length to the field device is 500 m shielded, 300 m unshielded — plenty for running sensor wires across a plant floor or down a conveyor line. The module draws 30 mA from the 5 V DC backplane bus and dissipates 3 W typical, so budget that into your S7-200 power supply calculation. ## Active lifecycle and sourcing Sourced through independent distribution channels and quoted to order against your BOM quantity.","metaTitle":"Siemens 6ES7221-1EF22-0XA0 EM 221 DI Module, 8 AC Inputs","metaDescription":"SIMATIC S7-200 EM 221 digital input module, 8 isolated 120/230 V AC inputs. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Digital Input Modules"],"specifications":{"Depth":"62 mm","Width":"71.2 mm","title":"6ES7221-1EF22-0XA0","Height":"80 mm","description":"*** spare part *** SIMATIC S7-200, digital input EM 221, isolated 8 DI, 120/230 V AC","2-Wire Sensor":"Yes","For Signal \"0\"":"up to 20 V AC","For Signal \"1\"":"79V AC or more","Shielded, Max.":"500 m","Weight, approx.":"160 g","lifecycle_stage":"current","Power loss, typ.":"3 W","Rated value (AC)":"230 V; 220/230 V AC (47 Hz to 63 Hz)","Unshielded, Max.":"300 m","At \"0\" To \"1\", Max.":"15 ms","For Signal \"1\", Typ.":"2.5 mA","Plug-in I/O terminals":"Yes","Type of input voltage":"AC","Number of digital inputs":"8","from backplane bus 5 V DC, max.":"30 mA","Between The Channels, In Groups Of":"1; 8 groups","Potential separation digital inputs":"Yes; Optocoupler","Permissible Quiescent Current (2-Wire Sensor), Max.":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$199.85","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0220028f14399d2ad8e951a2e14c2ce1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=462595&mlfb=6ES7221-1EF22-0XA0"},"ai":{"faq":[{"question":"How can I order or check availability for 6ES7221-1EF22-0XA0?","answer":"Availability and lead time are confirmed at quote time — no stock-holding claim is made here."},{"question":"What voltage does 6ES7221-1EF22-0XA0 accept on its inputs?","answer":"Rated input voltage is 220/230 V AC (47–63 Hz). A logic \"1\" requires 79 V AC or more; logic \"0\" is up to 20 V AC."},{"question":"Are the inputs on 6ES7221-1EF22-0XA0 isolated from each other?","answer":"Yes, each of the eight inputs is in its own isolation group, separated by optocouplers. One channel fault won't propagate to adjacent inputs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7221-1EF22-0XA0","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/6ES7221-1EF22-0XA0 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}}