{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-1CH80-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-1CH80-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-1CH80-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1CH80-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SM 321 digital input module, 6ES7321-1CH80-0AA0, 16 optically isolated inputs, DC 48–125 V, expanded temperature range, 20-pin front connector.","salesMarkdown":"## Input specs that govern the fit The 6ES7321-1CH80-0AA0: 16 digital inputs, optically isolated from the backplane bus and grouped in two banks of 8 with channel-to-channel isolation between groups. Rated for 48 VDC nominal, with a permissible range of 48 VDC to 125 VDC — covers nominal 48 V and 110 VDC control circuits common in industrial and utility plants. Signal thresholds are non-standard for a 24 V system: a logic '0' spans -146 VDC to +15 VDC, and a logic '1' requires 30 VDC to 146 VDC. This module is designed for higher-voltage DC buses, not standard 24 V PLC I/O. Typical input current at signal '1' is 3.5 mA; the module draws 40 mA max from the 5 VDC backplane bus. Power loss is 4.3 W typical — within the S7-300 rack's thermal budget for a 16-channel card. ## Switching response and wiring reach Input filter times: 0.1 ms to 3.5 ms on rising edge, 0.7 ms to 3 ms on falling edge. Fast enough for discrete sensing and limit-switch monitoring; not intended for high-speed encoder or pulse-train capture. Supports 2-wire proximity sensors with a max permissible quiescent current of 1 mA. Unshielded cable runs up to 600 m; shielded runs up to 1000 m — adequate for distributed field wiring in a plant. Green LED per channel for status indication. No diagnostics function and no alarms — a basic input module for straightforward discrete sensing.","metaTitle":"Siemens 6ES7321-1CH80-0AA0 SM 321, 16 DI, 48-125 VDC, EOL","metaDescription":"Siemens 6ES7321-1CH80-0AA0 SM 321 digital input module, 16 channels, 48-125 VDC, expanded temp range. End-of-life — sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Depth":"120 mm","Width":"40 mm","Alarms":"No","Height":"125 mm","2-Wire Sensor":"Yes","For Signal \"0\"":"-146 V DC to +15 V DC","For Signal \"1\"":"30 V DC to 146 V DC","Shielded, Max.":"1 000 m","Weight, approx.":"200 g","lifecycle_stage":"eol_hot","Power loss, typ.":"4.3 W","Rated value (DC)":"48 V","Unshielded, Max.":"600 m","up to 40 °C, max.":"8","up to 50 °C, max.":"8","up to 60 °C, max.":"8","up to 70 °C, max.":"16","At \"0\" To \"1\", Max.":"3.5 ms","At \"0\" To \"1\", Min.":"0.1 ms","At \"1\" To \"0\", Max.":"3 ms","At \"1\" To \"0\", Min.":"0.7 ms","Between The Channels":"Yes","Diagnostics function":"No","For Signal \"1\", Typ.":"3.5 mA","Isolation tested with":"1 500 V DC","Number of digital inputs":"16","Required Front Connector":"20-pin","from backplane bus 5 V DC, max.":"40 mA","Between The Channels, In Groups Of":"8","permissible range, lower limit (DC)":"48 V","permissible range, upper limit (DC)":"125 V","Between The Channels And Backplane Bus":"Yes","Status indicator digital input (green)":"Yes","Permissible Quiescent Current (2-Wire Sensor), Max.":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$208.28","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=364853&mlfb=6ES7321-1CH80-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-1CH80-0AA0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-1CH80-0AA0","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/6ES7321-1CH80-0AA0 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}}