{"product_id":"allen-bradley-1794-tbn-i-o-terminal-base-unit","title":"Allen-Bradley 1794-TBN I\/O Terminal Base Unit","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-TBN\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-TBN\u003c\/strong\u003e Terminal Base Unit, operates as a dedicated hardware component for field wiring termination and backplane signal 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-TBN\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\u003e0.56 lbs (0.26 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\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eHost backplane bus powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e16 I\/O Points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Terminals\u003c\/td\u003e\n\u003ctd\u003e2 Common Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e250 VAC\/DC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e250 V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Current Rating\u003c\/td\u003e\n\u003ctd\u003e10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Screw Torque\u003c\/td\u003e\n\u003ctd\u003e1.4 Nm (12 lb-in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size Range\u003c\/td\u003e\n\u003ctd\u003e22 to 12 AWG (0.34 to 2.5 mm2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Frequency\u003c\/td\u003e\n\u003ctd\u003e50 to 60 Hz\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-TBN terminal base unit provides the physical wiring matrix and internal backplane bus interconnectivity for 16-point Flex I\/O modules, supporting high-density I\/O scaling across distributed EtherNet\/IP, ControlNet, or Profinet networks. Internal bus connectors transmit power and control signals deterministically to mounted modules without signal loss, while offering full firmware flash compatibility across standard 1794 series adapter combinations. Integrated channel separation and continuous 250 V isolation 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 is the maximum current capacity per terminal on the 1794-TBN base unit?\u003c\/p\u003e\n\u003cp\u003eA: The 1794-TBN features a total maximum current rating of 10 A across its common\/power bus terminals, supporting field device distribution up to 250 VAC\/DC operational limits.\u003c\/p\u003e\n\u003cp\u003eQ: Are 1794 Flex I\/O modules hot-swappable when mounted on the 1794-TBN terminal base?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The 1794-TBN allows Removal and Insertion Under Power (RIUP), enabling I\/O module replacement without disturbing field wiring or interrupting backplane communication on adjacent base units.\u003c\/p\u003e\n\u003cp\u003eQ: What screw torque specification should be applied to the NEMA-style terminal block screws?\u003c\/p\u003e\n\u003cp\u003eA: All field wiring terminal screws on the 1794-TBN must be torqued to exactly 1.4 Nm (12 lb-in) to maintain solid physical contact and prevent connection resistance degradation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the 1794-TBN securely onto a standard 35 mm DIN rail or directly to a backpanel using the integrated mounting feet.\u003c\/li\u003e\n\u003cli\u003eLock adjacent terminal base units together using the side-locking keyways to ensure proper backplane bus pin engagement.\u003c\/li\u003e\n\u003cli\u003eStrip field conductors to specified lengths and secure 22 to 12 AWG copper wire to the cage-clamp terminals, torquing screws to 1.4 Nm.\u003c\/li\u003e\n\u003cli\u003eConnect power and common distribution lines to the designated common terminals to maintain balanced voltage potential across all 16 I\/O channels.\u003c\/li\u003e\n\u003cli\u003eEnsure the overall control enclosure maintains ambient temperatures between -20 deg C and 70 deg C to preserve terminal insulation ratings.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52653103218968,"sku":"1794-TBN","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1794-TBN1_Cocoai.jpg?v=1789092153","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1794-tbn-i-o-terminal-base-unit","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}