{"product_id":"tu891-3bsc840157r1-abb-s800-i-o-module-termination-unit","title":"TU891 3BSC840157R1 ABB S800 I\/O Module Termination Unit","description":"\u003cp\u003eConfigured for intrinsic safety field signal routing and process power distribution in S800 I\/O architectures, the \u003cstrong\u003eABB TU891\u003c\/strong\u003e (\u003cstrong\u003e3BSC840157R1\u003c\/strong\u003e Module Termination Unit) provides direct physical\/electrical execution.\u003c\/p\u003e\n\u003ch3\u003ePart Identification \u0026amp; Version Layout\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBase Model: TU891\u003c\/li\u003e\n\u003cli\u003eOrdering Catalog Part Number: 3BSC840157R1\u003c\/li\u003e\n\u003cli\u003eHardware Variant: Compact Module Termination Unit (MTU) with Terminal Block Connection\u003c\/li\u003e\n\u003cli\u003eTarget Application: Intrinsic Safety (Ex i) Signal Distribution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Technical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eTU891\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e3BSC840157R1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003esweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit Mass\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e7.6 x 7.6 x 20.3 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003eStandard industrial range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003eStandard industrial range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive distribution component\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Capacity\u003c\/td\u003e\n\u003ctd\u003e8 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V (Max 50 V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current Per Channel\u003c\/td\u003e\n\u003ctd\u003e2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDielectric Test Voltage\u003c\/td\u003e\n\u003ctd\u003e500 V a.c.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSystem Integration \u0026amp; Bus Architecture\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBackplane Bus Communication Velocity: Distributes the ModuleBus to the mounted I\/O module while propagating address shift signals down the rack tier to subsequent termination units.\u003c\/li\u003e\n\u003cli\u003eI\/O Density Scaling: Accommodates compact 8-channel deployments utilizing 27 gray terminal blocks designed explicitly for hazardous area signal segregation.\u003c\/li\u003e\n\u003cli\u003eFirmware Flash Compatibility: Acts as a passive physical connection medium with no internal firmware execution requirements.\u003c\/li\u003e\n\u003cli\u003eNetwork Determinism: Preserves deterministic bus timing across distributed nodes when paired with certified intrinsic safety modules such as AI890, AI893, AI895, AO890, AO895, DI890, and DO890.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAssociated Delivery Scope\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x TU891 3BSC840157R1 Module Termination Unit\u003c\/li\u003e\n\u003cli\u003eStandard industrial packaging housing (Electronic I\/O modules supplied separately)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMechanical and Electrical Deployment Directives\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDIN-Rail and Slot Mounting: Secure the compact unit horizontally onto standard DIN-rail assemblies, ensuring the grounding latch engages cleanly.\u003c\/li\u003e\n\u003cli\u003eMechanical Keying Verification: Utilize the factory-installed mechanical keys, which feature opposite polarization compared to standard units, to ensure only approved IS modules can be inserted.\u003c\/li\u003e\n\u003cli\u003eSignal Wiring Terminations: Route field wiring to the 27 gray terminals, keeping intrinsically safe conductors strictly separated from non-IS control loops to maintain compliance.\u003c\/li\u003e\n\u003cli\u003eGrounding Continuity: Verify that the DIN-rail latching mechanism establishes proper chassis reference for system shielding integrity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Inquiry \u0026amp; Troubleshooting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the primary operational purpose of the TU891 unit?\u003c\/p\u003e\n\u003cp\u003eIt serves as a compact module termination unit designed specifically for intrinsic safety (Ex i) applications in S800 I\/O systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhich specific I\/O modules are compatible with this termination unit?\u003c\/p\u003e\n\u003cp\u003eIt supports certified IS modules including AI890, AI893, AI895, AO890, AO895, DI890, and DO890.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow many total channels and terminal connections does the unit feature?\u003c\/p\u003e\n\u003cp\u003eThe MTU provides 8 input\/output channels supported by 27 gray terminal blocks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat are the electrical voltage and current limitations?\u003c\/p\u003e\n\u003cp\u003eThe unit is rated for a maximum voltage of 50 V (optimized for 24 V systems) with a current ceiling of 2 A per channel.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the unit prevent incorrect module insertion?\u003c\/p\u003e\n\u003cp\u003eIt incorporates specialized mechanical keys of a reverse gender configuration that mate exclusively with compatible IS modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat role does the unit play in ModuleBus communication?\u003c\/p\u003e\n\u003cp\u003eIt distributes the internal ModuleBus and shifts outgoing position signals to correctly address subsequent MTU nodes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat are the net weight and shipping envelope dimensions?\u003c\/p\u003e\n\u003cp\u003eThe unit weighs 0.2 kg with shipping package dimensions of 7.6 x 7.6 x 20.3 cm.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the hardware require an external power supply connection?\u003c\/p\u003e\n\u003cp\u003eNo, it functions as a passive physical distribution base powered via system bus architecture.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":46021138940077,"sku":"TU891 3BSC840157R1","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/tu891_5_7.jpg?v=1784816220","url":"https:\/\/www.maxwellplc.com\/ga\/products\/tu891-3bsc840157r1-abb-s800-i-o-module-termination-unit","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}