{"product_id":"di821-abb-48v-dc-16-channel-s800-digital-input-module-in-stock","title":"DI821 ABB 48V DC 16-Channel S800 Digital Input Module In Stock","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eABB DI821\u003c\/span\u003e\u003c\/b\u003e (Article Number: \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003e3BSE008552R1\u003c\/span\u003e\u003c\/b\u003e) delivers reliable discrete signal acquisition for industrial control architectures. Engineered for the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eABB S800 I\/O\u003c\/span\u003e\u003c\/b\u003e platform, this high-density digital input module processes sixteen 48 V d.c. current-sinking channels. Automation technicians utilize the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e to monitor critical field contacts, limit switches, and auxiliary interlocks in demanding power and process plants.\u003c\/p\u003e\n\u003cp\u003eTo preserve signal integrity in noisy electrical environments, the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e organizes its 16 channels into two groupwise isolated banks of eight. Each channel integrates dedicated EMC protection components, current-limiting circuitry, and an optical isolation barrier. Dedicated process voltage supervision continuously monitors supply power per channel group, ensuring immediate error reporting over ModuleBus if field power drops.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter Category\u003c\/th\u003e\n\u003cth\u003eTechnical Specification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eBrand \u0026amp; Model\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eABB DI821\u003c\/span\u003e\u003c\/b\u003e (Part Number: \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003e3BSE008552R1\u003c\/span\u003e\u003c\/b\u003e)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eModule Series\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/s800-i-o\"\u003e\u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eABB S800 I\/O\u003c\/span\u003e\u003c\/b\u003e\u003c\/a\u003e System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInput Specification\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e16 current-sinking channels; Nominal 48 V d.c. (4 mA @ 48 V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eVoltage Signal Thresholds\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eState \"0\": -60 V to +10 V d.c.; State \"1\": +30 V to +60 V d.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInput Impedance \u0026amp; Filters\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e11 kΩ input impedance; Selectable digital filter times (2, 4, 8, 16 ms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eGroup Isolation\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e2 groups of 8 channels isolated from ground; Rated insulation 50 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003ePower Consumption \u0026amp; Dissipation\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003ePower dissipation typ. 2.7 W; Modulebus +5V current max 50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eEnvironmental Rating\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eISA-S71.04 Class G3 harsh corrosion protection; Operating temperature 0 °C to +55 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eField Wiring Distance\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eMaximum field cable length 600 meters (656 yards)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eMechanical Profile\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eDimensions 45 mm W x 119 mm H x 102 mm D; Weight 0.15 kg (0.33 lbs); Mechanical keying code \u003cb\u003eBD\u003c\/b\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cb\u003eDiagnostic Capabilities\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFront LED Display Indicators\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eF (Fault) LED illuminates upon internal system failure or ModuleBus fault.\u003c\/li\u003e\n\u003cli\u003eR (Run) LED confirms active communication status across backplane bus.\u003c\/li\u003e\n\u003cli\u003eW (Warning) LED signals out-of-spec operational conditions or group voltage drop.\u003c\/li\u003e\n\u003cli\u003eChannel LEDs 1 through 16 display individual real-time field state (\"0\" or \"1\").\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGroup Power Supervision\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eIndependent voltage monitoring for each isolated 8-channel group.\u003c\/li\u003e\n\u003cli\u003eAutomatic transmission of Channel Error flags via ModuleBus upon field power failure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eSuitable Equipment \u0026amp; Application Scenarios\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSubstation \u0026amp; Power Station Monitoring\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eCaptures circuit breaker status and isolator switch positions operating on 48 V d.c. control buses.\u003c\/li\u003e\n\u003cli\u003eProvides high optical isolation against high-voltage switching surges and ground potential rises.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIndustrial Safety Interlocks \u0026amp; Door Contacts\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eMonitors long-distance field limit switches up to 600 meters away from the I\/O cabinet.\u003c\/li\u003e\n\u003cli\u003eSelectable digital filtering (up to 16 ms) eliminates contact bounce artifacts from mechanical switches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTurbine Control Auxiliary Systems\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eInterfaces auxiliary trip signals and lube oil pressure switch contacts into DCS logic.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eSystem Compatibility\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eModule Termination Units (MTUs)\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for compact installation on base model \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU810V1\u003c\/span\u003e\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eFully compatible with standard MTU bases: \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU810\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU812\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU814\u003c\/span\u003e\u003c\/b\u003e, and \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU818\u003c\/span\u003e\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eSupports extended units: \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU830\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU833\u003c\/span\u003e\u003c\/b\u003e, \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU838\u003c\/span\u003e\u003c\/b\u003e, and \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU850\u003c\/span\u003e\u003c\/b\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMechanical Keying Alignment\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eFactory mechanical keying code \u003cb\u003eBD\u003c\/b\u003e prevents accidental insertion into incorrect MTU slots.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eInstallation Guide\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMechanical Mounting\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eSet mechanical keying dial on the target base unit to position \u003cb\u003eBD\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eMount the Module Termination Unit onto standard DIN rail configurations.\u003c\/li\u003e\n\u003cli\u003eInsert the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e module firmly into place until side locking tabs fully click.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eField Wiring Practices\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eConnect 48 V d.c. field potential to designated group power terminals on the MTU base.\u003c\/li\u003e\n\u003cli\u003eRoute field input wiring away from high-power AC motor leads to reduce electromagnetic coupling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eCommissioning \u0026amp; Maintenance\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSoftware Configuration\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eSelect appropriate digital filter timing (2 ms, 4 ms, 8 ms, or 16 ms) within controller software properties.\u003c\/li\u003e\n\u003cli\u003eAssign channel tags and alarm thresholds inside system engineer workplaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaintenance Procedures\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eHot-swap operational modules during plant maintenance without interrupting ModuleBus power.\u003c\/li\u003e\n\u003cli\u003eVerify active input channel states directly via front panel LED indicators.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eCertifications \u0026amp; Standards\u003c\/b\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification Domain\u003c\/th\u003e\n\u003cth\u003eCompliance Standards\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eElectrical Safety\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eEN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eHazardous Location Approvals\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eClass 1 Division 2 cULus, Class 1 Zone 2 cULus, ATEX Zone 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eMarine Certifications\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eABS, BV, DNV, LR class approvals for maritime and offshore applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eElectromagnetic Compatibility\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eEN 61000-6-4, EN 61000-6-2, CE Mark, RoHS 2011\/65\/EU, WEEE 2012\/19\/EU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cb\u003ePackage \u0026amp; Delivery Information\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eShipping \u0026amp; Logistics\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eFast dispatch within 24 to 48 hours following payment confirmation.\u003c\/li\u003e\n\u003cli\u003eGlobal express delivery available via FedEx, UPS, and DHL air transport.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePackaging \u0026amp; Guarantee\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes 12-Month full replacement warranty coverage.\u003c\/li\u003e\n\u003cli\u003eShipped in electrostatic discharge (ESD) protective packaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eGlobal PLC Spare HUB's Insight\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eDuring an upgrade project at a electrical switching station, plant engineers encountered false digital trips on long-run status lines. Induced electrical noise was triggering false ON states on standard 24 V DC input cards. By upgrading to the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eABB DI821\u003c\/span\u003e\u003c\/b\u003e 48 V DC module paired with \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eTU810V1\u003c\/span\u003e\u003c\/b\u003e MTUs, the higher voltage threshold (State \"1\" minimum of 30 V) effectively eliminated noise sensitivity. Adjusting the digital filter setting to 8 ms inside controller parameters further stabilized the contact inputs without sacrificing system response time.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eSelection Guide\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eVoltage Rating Selection\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eChoose \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e for installations using 48 V d.c. auxiliary control power batteries.\u003c\/li\u003e\n\u003cli\u003eSelect standard 24 V DC digital input modules for low-voltage sensor loops to ensure voltage compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCurrent Sinking Architecture\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that field contact field sensors switch positive 48 V d.c. potential into the sinking input terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions (FAQ)\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: What is the benefit of the 48 V d.c. operating voltage over standard 24 V d.c. input modules?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 48 V d.c. rating provides higher noise immunity across long field cables up to 600 meters, making the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e ideal for power utilities and large industrial plants.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: How does digital input filter timing selection impact control performance?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: Setting a longer filter time (e.g., 16 ms) prevents contact bounce from mechanical switches from causing multiple false triggers, while shorter filter times (2 ms) are ideal for fast pulse counting.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: What occurs when one group of field power fails on the input module?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: The process voltage supervision detects the loss of supply power for that specific 8-channel group, turns on the front Warning LED, and sends a Module Error code across ModuleBus.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Can 24 V d.c. field signals be wired directly into the DI821 digital input channels?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. The minimum voltage required to register a high state (\"1\") on the \u003cb\u003e\u003cspan style=\"color: #0056b3;\"\u003eDI821\u003c\/span\u003e\u003c\/b\u003e is 30 V d.c., so a 24 V signal will not trigger the input.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Are the channels individually isolated from one another on this module?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 16 channels are isolated in two distinct groups of eight channels each. Channels within the same group share a common return potential, while the two groups are galvanically isolated from each other and ground.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":45382136103094,"sku":"DI821","price":105.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/DI821.jpg?v=1787646475","url":"https:\/\/www.plcsparehub.com\/products\/di821-abb-48v-dc-16-channel-s800-digital-input-module-in-stock","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}