{"product_id":"abb-di821-230v-ac-dc-digital-input-module-for-s800-i-o","title":"ABB DI821 230V AC\/DC Digital Input Module for S800 I\/O","description":"\u003ch2\u003eProduct Introduction\u003c\/h2\u003e\u003cp\u003eThe ABB DI821 is an 8-channel, 230 V a.c.\/d.c. digital input module designed for the S800 I\/O system. Built for demanding industrial environments, the DI821 delivers reliable signal acquisition with individually isolated channels, ensuring clean and accurate data collection even in high-interference settings. Each channel incorporates current limiting, EMC protection, an input status LED, optical isolation, and a 6 ms analog filter, providing robust performance and clear visual feedback.\u003c\/p\u003e\u003cp\u003eWith support for both alternating and direct current inputs, the ABB DI821 offers flexibility across diverse field devices. Its voltage supervision capability on channels 1 and 8 monitors field power integrity, automatically triggering warning indicators and ModuleBus error signals if power is lost. This proactive feature minimizes downtime by alerting operators to potential issues before they escalate.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003eThe ABB DI821 is engineered for precision and durability. Below are the key specifications that define its performance:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eArticle Number\u003c\/td\u003e\n\u003ctd\u003e3BSE008550R1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range (\"1\")\u003c\/td\u003e\n\u003ctd\u003e164–264 V a.c., 175–275 V d.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range (\"0\")\u003c\/td\u003e\n\u003ctd\u003e0–50 V a.c., 0–40 V d.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e21 kΩ (a.c.) \/ 134 kΩ (d.c.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eIndividually isolated channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Times (Digital, Selectable)\u003c\/td\u003e\n\u003ctd\u003e2, 4, 8, 16 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Filter On\/Off Delay\u003c\/td\u003e\n\u003ctd\u003e5 \/ 28 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Field Cable Length\u003c\/td\u003e\n\u003ctd\u003e200 m (219 yds) for a.c., 600 m (656 yds) for d.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Insulation Voltage\u003c\/td\u003e\n\u003ctd\u003e250 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDielectric Test Voltage\u003c\/td\u003e\n\u003ctd\u003e2000 V a.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003eTyp. 2.8 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Consumption (+5 V Modulebus)\u003c\/td\u003e\n\u003ctd\u003e50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to +55 °C (+32 to +131 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 °C (-40 to +158 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Class\u003c\/td\u003e\n\u003ctd\u003eIP20 (IEC 60529)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W×D×H)\u003c\/td\u003e\n\u003ctd\u003e45 mm × 102 mm × 119 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.18 kg (0.4 lbs.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThese specifications confirm the ABB DI821's capability to handle high-voltage inputs while maintaining signal integrity, making it a dependable choice for critical automation tasks.\u003c\/p\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe ABB DI821 excels in applications where high-voltage discrete inputs must be monitored reliably. Typical use cases include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Control Centers:\u003c\/strong\u003e Monitoring starter auxiliary contacts and overload relays in 230 V AC control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Distribution Panels:\u003c\/strong\u003e Tracking breaker status and alarm signals in switchgear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess Control Systems:\u003c\/strong\u003e Reading limit switches and proximity sensors in manufacturing lines.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn each scenario, the DI821's voltage supervision on channels 1 and 8 provides an extra layer of protection by detecting loss of field power, which can prevent unexpected machine stops. Its individually isolated channels also reduce the risk of cross-talk, ensuring accurate state detection even in electrically noisy environments.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eProper installation of the ABB DI821 ensures optimal performance. Follow these guidelines:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMount the module on a standard S800 DIN rail using the appropriate MTU (e.g., TU811, TU813, TU831, TU839, TU851).\u003c\/li\u003e\n\u003cli\u003eVerify the keying code (AC) matches the MTU to prevent incorrect insertion.\u003c\/li\u003e\n\u003cli\u003eConnect field wiring to the MTU terminals, observing the cable length limits: 200 meters for AC inputs and 600 meters for DC inputs.\u003c\/li\u003e\n\u003cli\u003eEnsure the module is properly grounded via the mounting rail and that the equipment class (Class I) requirements are met.\u003c\/li\u003e\n\u003cli\u003eConfigure the digital filter times (2, 4, 8, or 16 ms) via the control system to match the input signal characteristics.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlways power down the system before installing or removing the module to avoid damage.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eThe ABB DI821 is designed for long-term reliability, but routine checks can extend its service life. Inspect the module periodically for:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAccumulated dust or debris on the front panel or ventilation areas, which could affect cooling.\u003c\/li\u003e\n\u003cli\u003eTightness of field wiring connections to prevent intermittent signals.\u003c\/li\u003e\n\u003cli\u003eCondition of the status LEDs — they should illuminate clearly when inputs are active.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOperating within the specified temperature range (0 to +55 °C) and relative humidity (5 to 95%, non-condensing) is critical. For vertical mounting in compact MTUs, the maximum ambient temperature is reduced to 40 °C, so ensure adequate airflow in confined enclosures.\u003c\/p\u003e\u003cp\u003eBy following these practices, you can maximize uptime and reduce replacement costs, making the DI821 a cost-effective solution over its lifecycle.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThe ABB DI821 integrates seamlessly with the S800 I\/O system, a widely adopted platform in ABB's distributed control systems. It communicates via the ModuleBus, allowing the error and warning signals to be read directly by the controller. The module is compatible with the following MTUs:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTU811V1\u003c\/li\u003e\n\u003cli\u003eTU811\u003c\/li\u003e\n\u003cli\u003eTU813\u003c\/li\u003e\n\u003cli\u003eTU831\u003c\/li\u003e\n\u003cli\u003eTU839\u003c\/li\u003e\n\u003cli\u003eTU851\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis compatibility ensures easy integration into existing ABB automation architectures, whether in greenfield projects or retrofits.\u003c\/p\u003e\u003ch2\u003eSelection Guide \u0026amp; Purchasing Advice\u003c\/h2\u003e\u003cp\u003eBefore purchasing the ABB DI821, verify the following:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConfirm the article number (3BSE008550R1) matches your requirement.\u003c\/li\u003e\n\u003cli\u003eCheck that your system's MTU supports the DI821 and the keying code AC.\u003c\/li\u003e\n\u003cli\u003eEnsure the input voltage ranges (AC: 164–264 V, DC: 175–275 V) align with your field signals.\u003c\/li\u003e\n\u003cli\u003eReview the environmental certifications (CE, marine ABS\/BV\/DNV\/LR) if applicable to your industry.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePLC Source PRO offers genuine ABB DI821 modules with fast shipping and competitive pricing. Our inventory is sourced from trusted suppliers, ensuring authenticity and reliability for your automation projects.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default","offer_id":44443604025443,"sku":"DI821","price":292.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/DI821__E5_89_AF_E6_9C_AC.jpg?v=1785929220","url":"https:\/\/www.plcsourcepro.com\/ar\/products\/abb-di821-230v-ac-dc-digital-input-module-for-s800-i-o","provider":"PLC Source PRO","version":"1.0","type":"link"}