{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6AG1321-1CH20-2AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6AG1321-1CH20-2AA0","canonicalUrl":"https://aoctrl.com/siemens/6AG1321-1CH20-2AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6AG1321-1CH20-2AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIPLUS SM 321 digital input module, 6AG1321-1CH20-2AA0, 16 channels, 48-125 VDC, -40 to 70°C, EN 50155 railway certified.","salesMarkdown":"## 16-channel 48-125 VDC input with railway-grade temperature range The Siemens 6AG1321-1CH20-2AA0 is a SIPLUS SM 321 digital input module with 16 channels accepting 48 VDC to 125 VDC nominal input voltage. The wide signal-1 threshold of 30 VDC to 146 VDC means it registers a logic high across a broad range, tolerating voltage sag on long cable runs without false off-states. The EN 50155 certification (sections 4, 5, 12; T1, Category 1, Class A/B) confirms it for rolling-stock vibration, temperature cycling, and supply interruptions — not just a wider temp range but a full railway qualification. ## Derating and channel count at elevated temperature At 50 °C and below, all 16 channels are usable at any input voltage. At 60 °C, the module still delivers 8 channels at 48 VDC but drops to 6 channels when the input voltage reaches 146 VDC. At the 70 °C ceiling, it supports 6 channels at 48 VDC and only 4 at 146 VDC. This derating is driven by internal dissipation at higher input current and ambient — plan the channel assignment accordingly if the module sits near a heat source. Typical power loss is 4.3 W, and the module draws 40 mA max from the 5 VDC backplane bus. The 20-pin front connector (required, not included) carries the field wiring; unshielded cable runs up to 600 m, shielded up to 1000 m.","metaTitle":"Siemens 6AG1321-1CH20-2AA0 Digital Input Module, -40 to 70°C","metaDescription":"Siemens 6AG1321-1CH20-2AA0 SIPLUS SM 321 digital input module. 16 channels, 48-125 VDC. Extended temp range -40 to 70°C. EN 50155 railway certified.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Digital Input Modules"],"specifications":{"Max.":"70 °C","Min.":"-40 °C","Depth":"120 mm","Width":"40 mm","title":"6AG1321-1CH20-2AA0","Alarms":"No","Height":"125 mm","CE mark":"Yes","EN 50155":"Yes; Sections 4, 5 and 12; no further agreements apply; T1, Category 1, Class A/B, EN 50155:2007 (see SIOS entry 109755985)","KC approval":"Yes","UL approval":"Yes; File E239877","description":"SIPLUS S7-300 SM 321 based on 6ES7321-1CH20-0AA0 with conformal coating, -25…+70 °C, digital input isolated 16 DI, 48-125 V DC, 1x 20-pole","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","Parameterizable":"No","Weight, approx.":"200 g","lifecycle_stage":"current","Diagnostic alarm":"No","Power loss, typ.":"4.3 W","Rated value (DC)":"48 V; 48 V DC to 125 V DC","Unshielded, Max.":"600 m","Hardware interrupt":"No","up to 50 °C, max.":"8","up to 60 °C, max.":"8; 6 to Ue 146 V","up to 70 °C, max.":"6; 4 @ Ue 146 V","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":"No","Diagnostics function":"No","For Signal \"1\", Typ.":"3.5 mA","Group error SF (red)":"No","EAC (formerly Gost-R)":"Yes","Isolation tested with":"1 500 V DC","RCM (formerly C-TICK)":"Yes","Type of input voltage":"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; Optocoupler","Status indicator digital input (green)":"Yes","Installation altitude above sea level, max.":"2 000 m","Permissible Quiescent Current (2-Wire Sensor), Max.":"1 mA","Ambient air temperature-barometric pressure-altitude":"Tmin ... Tmax at 1 140 hPa ... 795 hPa (-1 000 m ... +2 000 m)","Environmental conditions for process, measuring and control systems acc. to ANSI/ISA-71.04":"Yes; Level GX group A/B (excluding trichlorethylene; harmful gas concentrations up to the limits of EN 60721-3-3 class 3C4 permissible); level LC3 (salt spray) and level LB3 (oil)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,185.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6b2336d66a9ae7e24e57479029b60c55.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=172976&mlfb=6AG1321-1CH20-2AA0"},"ai":{"faq":[{"question":"Is 6AG1321-1CH20-2AA0 a direct replacement for 6ES7321-1CH20-0AA0?","answer":"Functionally yes — same 16-channel 48-125 VDC input architecture, same 20-pin front connector, same S7-300 form factor. The difference is the temperature range: the SIPLUS variant is -40 to 70 °C vs the standard 0-60 °C, and it carries EN 50155 railway certification. If the original BOM specified the standard module for a conditioned cabinet, the SIPLUS version fits without a board spin."},{"question":"How can I order the 6AG1321-1CH20-2AA0?","answer":"This is an active-production part sourced to order against your BOM quantity. Submit an RFQ for current pricing and lead time; availability is confirmed at quote time. No minimum order quantity applies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6AG1321-1CH20-2AA0","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/6AG1321-1CH20-2AA0 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}}