{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7231-7PB21-0XA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7231-7PB21-0XA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7231-7PB21-0XA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7231-7PB21-0XA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-200 EM231 RTD input module, 2 analog inputs, for PT100/200/500/1000/10000, Ni100/120/1000, Cu10, and resistance 150/300/600 ohm, 15-bit + sign resolution.","salesMarkdown":"## RTD module for the S7-200 rack The Siemens 6ES7231-7PB21-0XA0 is an EM231 RTD input module that mounts directly on the S7-22X CPU expansion bus — no separate power supply needed beyond the backplane. It provides 2 analog inputs configurable for PT100, PT200, PT500, PT1000, PT10000, Ni100, Ni120, Ni1000, Cu10, or resistance ranges of 150, 300, and 600 ohms with 15-bit plus sign resolution. ## RTD types you can wire directly The module accepts a wide range of RTD types: PT100/200/500/1000/10000, Ni100/120/1000, and Cu10, plus straight resistance measurements in 150, 300, and 600 ohm ranges. Resolution is 15-bit plus sign across the selected range, which gives you enough granularity to see a fraction of a degree on a PT100 without external signal conditioning.","metaTitle":"Siemens 6ES7231-7PB21-0XA0 EM231 RTD Module, 2 AI","metaDescription":"Siemens 6ES7231-7PB21-0XA0 EM231 RTD module for S7-200. 2 analog inputs for PT100/1000, Ni100, resistance. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Analog Input Modules"],"specifications":{"title":"6ES7231-7PB21-0XA0","Part #":"6ES7231-7PB21-0XA0","Weight":"0.16 kgs","Category":"PLCs and Accessories","description":"SIMATIC S7-200, RTD INPUT MOD. EM 231, FOR S7-22X CPU ONLY, 2AI, PT100/200/500/1000/10000 NI100/120/1000, CU10, RESISTANCE 150/300/600 OHM 15 BIT+ SIGN","Sub Category":"Industrial Computer Board","Top Category":"PLCs & HMIs","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$393.70 – $545.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4e1b047c88d7a611c8aaabc85bee0854.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=249166&mlfb=6ES7231-7PB21-0XA0"},"ai":{"faq":[{"question":"Where can I buy 6ES7231-7PB21-0XA0 and check stock?","answer":"The 6ES7231-7PB21-0XA0 is sourced to order against an RFQ through independent distribution."},{"question":"What RTD types does the 6ES7231-7PB21-0XA0 support?","answer":"It supports PT100, PT200, PT500, PT1000, PT10000, Ni100, Ni120, Ni1000, Cu10, and resistance ranges of 150, 300, and 600 ohms."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7231-7PB21-0XA0","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/6ES7231-7PB21-0XA0 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}}