{"product_id":"ntdi21-b-abb-termination-units","title":"NTDI21-B ABB Termination Units","description":"\u003cp\u003eThe \u003cstrong\u003eABB NTDI21-B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eNTDI21-B\u003c\/strong\u003e Termination Unit, operates as a dedicated hardware component for digital input\/output signal termination and galvanic isolation within ABB Bailey Infi 90 \/ Network 90 control networks.\u003c\/p\u003e\n\u003ch3\u003eHardware 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\u003eNTDI21-B\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.85 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e240 mm x 120 mm x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC Loop Powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Inputs\u003c\/td\u003e\n\u003ctd\u003e16 Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Outputs\u003c\/td\u003e\n\u003ctd\u003e16 Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Isolation\u003c\/td\u003e\n\u003ctd\u003eBuilt-in Isolation Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransient Protection\u003c\/td\u003e\n\u003ctd\u003eIntegrated Surge Protection Circuitry\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network Integration and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe NTDI21-B termination unit routes 16 discrete input signals and 16 discrete output channels to backplane processing modules, ensuring steady backplane bus communication velocity across Profinet and EtherNet\/IP deterministic networks. Channel-to-channel isolation and onboard surge absorption circuits shield logic-level hardware from voltage spikes and noise. Dense terminal block layout maximizes I\/O density scaling within processing cabinets, while internal passive routing pathways maintain full firmware flash compatibility across primary controller modules.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can digital signal field cables be wired to the NTDI21-B while the connected I\/O module is under load?\u003c\/p\u003e\n\u003cp\u003eA: Field power supplies must be de-energized prior to wiring or removing terminal connections to prevent electrical arcing and signal line transients.\u003c\/p\u003e\n\u003cp\u003eQ: How does the internal isolation transformer protect connected controller circuitry?\u003c\/p\u003e\n\u003cp\u003eA: The integrated transformer provides a physical galvanically isolated barrier, preventing ground loops and high-voltage line surges from reaching the logic backplane.\u003c\/p\u003e\n\u003cp\u003eQ: What grounding procedure is required for the integrated surge protection circuits?\u003c\/p\u003e\n\u003cp\u003eA: The ground terminal on the chassis mounting lug must be connected directly to the panel functional earth bus using a low-impedance grounding conductor.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect loop power sources and main cabinet power before installing or servicing field terminal connections.\u003c\/li\u003e\n\u003cli\u003eEnsure all terminal screw connections are torqued properly to maintain low-resistance contact on discrete I\/O wiring.\u003c\/li\u003e\n\u003cli\u003eMaintain separation between field AC\/DC power conductors and low-voltage digital signal cables to minimize electromagnetic coupling.\u003c\/li\u003e\n\u003cli\u003eVerify proper seating of multi-pin cable connectors between the termination unit and the corresponding controller rack module.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":53253880611125,"sku":"NTDI21-B","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/NTDI21-B.png?v=1786005427","url":"https:\/\/www.5gplc.com\/products\/ntdi21-b-abb-termination-units","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}