{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7421-7BH01-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7421-7BH01-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7421-7BH01-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7421-7BH01-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 6ES7421-7BH01-0AB0 — now in phase-out and being discontinued, supplied from remaining surplus and broker stock.","salesMarkdown":"## Overview The 6ES7421-7BH01-0AB0 is a Siemens SM 421 digital input module for the S7-400 platform, offering 16 inputs rated for 24 V DC with a signal-1 threshold of 11 V DC to 30 V DC and a typical input current of 6 mA per channel.","metaTitle":"Siemens 6ES7421-7BH01-0AB0 SM 421 digital input module, 16 DI, 24 V DC","metaDescription":"Siemens 6ES7421-7BH01-0AB0 SM 421 digital input module: 16 inputs, 24 V DC, 5.0 W, 25 mm wide, RoHS since 01-03-08. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Depth":"210 mm","Width":"25 mm","Height":"290 mm","Wire-break":"Yes; I < 1 mA","Rated value":"120 mA","2-Wire Sensor":"Yes","For Signal \"0\"":"-30 V DC to +5 V DC","For Signal \"1\"":"11 V DC to 30 V DC","Shielded, Max.":"1 000 m; 1 000 m: 3 ms, 70 m: 0.5 ms, 30 m: 0.1 ms, 30 m: 0.05 ms","Parameterizable":"Yes","Weight, approx.":"600 g","lifecycle_stage":"mature","Diagnostic alarm":"Yes; Parameterizable","Power loss, typ.":"5 W","Rated value (DC)":"24 V","Unshielded, Max.":"600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms","Number of outputs":"2","Hardware interrupt":"Yes; Parameterizable","At \"0\" To \"1\", Min.":"3 µs; 0.05 / 0.1 / 0.5 / 3 ms","Between The Channels":"Yes","Diagnostics function":"Yes; Parameterizable","For Signal \"0\", Min.":"6 mA; < 6 mA","For Signal \"1\", Typ.":"6 mA; 6 to 8 mA","Isolation tested with":"500 V DC","Type of input voltage":"DC","Type of output voltage":"L+ (-2.5 V)","Number of digital inputs":"16","Short-circuit protection":"Yes; Electronic","external fault EXTF (red)":"Yes","internal fault INTF (red)":"Yes","Additional (Redundant) Feed":"Yes; possible","Reverse polarity protection":"Yes","from supply voltage L+, max.":"120 mA","Monitoring the supply voltage":"Yes","Permissible Range, Lower Limit":"0 mA","Permissible Range, Upper Limit":"150 mA","Rated load voltage PWR (green)":"Yes; Per group","Channel fault indicator F (red)":"No","Diagnostic information readable":"Yes","from backplane bus 5 V DC, max.":"130 mA","Between The Channels, In Groups Of":"8","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Between The Channels And Backplane Bus":"Yes","Status indicator digital input (green)":"Yes","Input characteristic according to IEC 61131":"Type 2","Number of simultaneously controllable inputs":"16","Permissible Quiescent Current (2-Wire Sensor), Max.":"3 mA","Fixed current limitation for wire-break monitoring, max.":"18 kΩ","Fixed current limitation for wire-break monitoring, min.":"10 kΩ"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$558.80 – $744.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/dd5e514eedec7d17825c8d1ab29e1a11.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=250216&mlfb=6ES7421-7BH01-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7421-7BH01-0AB0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7421-7BH01-0AB0","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/6ES7421-7BH01-0AB0 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}}