{"product_id":"allen-bradley-1794-tb3-flex-i-o-terminal-base-unit","title":"Allen-Bradley 1794-TB3 Flex I\/O Terminal Base Unit","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-TB3\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-TB3\u003c\/strong\u003e Terminal Base Unit, operates as a dedicated hardware component for field signal termination and backplane power routing within Flex I\/O 1794 system architectures.\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\u003e1794-TB3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\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\u003e0.63 lbs (0.28 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Flex I\/O Terminal Base Footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e640 mA at 5 VDC (FLEXBus current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eV\/COM Terminal Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e125 VAC\/DC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eV\/COM Terminal Frequency\u003c\/td\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eV\/COM Terminal Current\u003c\/td\u003e\n\u003ctd\u003e10 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Isolation Voltage\u003c\/td\u003e\n\u003ctd\u003e125 V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTermination Type\u003c\/td\u003e\n\u003ctd\u003eCage-Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Screw Torque\u003c\/td\u003e\n\u003ctd\u003e0.56 to 0.79 Nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen-Style (None)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network Communication \u0026amp; I\/O Density\u003c\/h3\u003e\n\u003cp\u003eThe 1794-TB3 terminal base unit establishes the electrical wiring foundation and high-density I\/O routing matrix for standard 3-wire Flex I\/O modules, accelerating I\/O density scaling across distributed control networks. Internal bus connectors transmit 5 VDC power up to 640 mA and control signals deterministically to mounted modules without signal loss, while offering full firmware flash compatibility across standard 1794 series network adapters. Integrated channel isolation and continuous 125 V rating ensure high backplane bus communication velocity and signal integrity during fast switching events.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What torque rating should be applied to the cage-clamp terminal screws on the 1794-TB3?\u003c\/p\u003e\n\u003cp\u003eA: Terminal screws must be torqued to between 0.56 and 0.79 Nm (5 to 7 lb-in) to ensure stable electrical connections and prevent conductor damage.\u003c\/p\u003e\n\u003cp\u003eQ: Can 1794 series I\/O modules be replaced on the 1794-TB3 while power is applied to the backplane?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The 1794-TB3 supports Removal and Insertion Under Power (RIUP), allowing field replacement of mounted modules without disturbing wiring or disrupting backplane bus communications to adjacent units.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum voltage and current capacity of the V\/COM terminals?\u003c\/p\u003e\n\u003cp\u003eA: The V\/COM terminals are rated for up to 125 VAC\/DC at 50\/60 Hz with a maximum continuous current capacity of 10 A.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the open-style 1794-TB3 unit inside a protective panel enclosure on a standard 35 mm DIN rail.\u003c\/li\u003e\n\u003cli\u003eInterconnect adjacent terminal base units using the integrated side-locking keys to ensure proper backplane connector engagement.\u003c\/li\u003e\n\u003cli\u003eStrip field wiring conductors to specified lengths and secure them into the cage-clamp terminals, applying 0.56 to 0.79 Nm of torque to the screws.\u003c\/li\u003e\n\u003cli\u003eConnect main power and common supply conductors to the designated V\/COM terminals to provide distributed power across mounted I\/O modules.\u003c\/li\u003e\n\u003cli\u003eEnsure panel enclosure ventilation maintains ambient temperatures within the specified -20 to 70 deg C operating envelope.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52653103350040,"sku":"1794-TB3","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1794-TBN1_Cocoai_2acee8e2-3bf8-4d28-97a7-3452ea2c1422.jpg?v=1789092183","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1794-tb3-flex-i-o-terminal-base-unit","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}