{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-5AK20-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-5AK20-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-5AK20-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-5AK20-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1500 front connector module, 6ES7921-5AK20-0AA0, 40-pole IDC connector for analog I/O modules, 24 V rated, direct mounting.","salesMarkdown":"The Siemens 6ES7921-5AK20-0AA0 is a front connector module designed for the SIMATIC S7-1500 system, specifically for analog I/O modules. It provides a 40-pole connection via four 16-pole IDC connectors, routing signals from the I/O module to the terminal block. The 24 V rated supply voltage powers the module's internal bus, and the connector sits at the top of the module, accepting a 3.5 mm screwdriver blade for termination. This is the physical interface that bridges the analog field wiring to the S7-1500 backplane — if you're building or maintaining an S7-1500 analog I/O rack, this is the part that lands the wires. The 40-pole count is the headline number: it matches the pinout of S7-1500 analog I/O modules with 40 signal channels. If your module has fewer channels, the extra poles are simply unused — no conflict. The 24 V rated value is the module's internal logic supply, not the field signal voltage; the field signals pass through unaltered. The maximum DC voltage rating of 60 V sets the ceiling for any field-side voltage that might appear on the connector pins — stay under that for the analog signals. The direct mounting type means this module snaps onto the S7-1500 rail without additional brackets.","metaTitle":"Siemens 6ES7921-5AK20-0AA0 Front Connector Module, 40-Pole,","metaDescription":"Siemens 6ES7921-5AK20-0AA0 front connector module for SIMATIC S7-1500 analog I/O modules. 40-pole IDC connector, 24 V rated, direct mounting. Active production. Sourced to order vi","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Accessories"],"specifications":{"title":"6ES7921-5AK20-0AA0","Rated Value":"24 V","description":"Front connector module with 4x16 pole IDC connector for analog 40 pole I/O modules of the S7-1500 Potential supply over Infeed element","Mounting Type":"direct mounting","Target System":"SIMATIC S7-1500","During Storage":"-40 ... +70 °C","Number Of Poles":"40; of the front connector","at DC / maximum":"60 V","lifecycle_stage":"mature","During Operation":"0 ... 60 °C","Degree Of Pollution":"2","Product Designation":"Front connector module","Suitability For Use":"Analog I/O modules","at DC / rated value":"24 V","Overvoltage Category":"2","Operating Temperature":"0 ... 60 °C","Wire Length / Maximum":"30 m; between front connector module and terminal module","Color / Of The Enclosure":"black","Position / Of The Terminal":"at the top","Width Of Screwdriver Blade":"3.5 mm","Product Feature / Transparent":"No","Material / Of The Insulating Body":"other","Number Of Cables / Per Connection":"2; Connection for internal system: Combination of 1 or 2 Wires until the sum total of cross sections be achieved in a ferrule.","Number Of Poles / At The 1st Interface":"16; the IDC connector for the connection cable","reference code / according to IEC 81346-2":"XG","Product Component / Required / End Cover Plate":"No","design tested acc. to type of protection / EEx e":"No","For Flexible Conductor / With Core End Processing":"voltage supply via feed element of the module","Type Of Connectable Conductor Cross-Sections / Solid":"No","Type Of Electrical Connection / For Connecting Cable":"Plug-in connection","Number Of The Plug Contacts / Of The Electrical Connection":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$45.72","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6d57f154fff616166253fab8c566f5cb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=409247&mlfb=6ES7921-5AK20-0AA0"},"ai":{"faq":[{"question":"What is the rated voltage for this front connector module?","answer":"The rated voltage is 24 V DC. This supplies the module's internal logic; field signals pass through at their own voltage, up to 60 V DC maximum."},{"question":"What is the mounting type?","answer":"Direct mounting — it snaps onto the S7-1500 mounting rail without additional hardware."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-5AK20-0AA0","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/6ES7921-5AK20-0AA0 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}}