{"product_id":"allen-bradley-1794-tbn-flex-i-o-nema-terminal-base-unit","title":"Allen-Bradley 1794-TBN FLEX I\/O NEMA Terminal Base Unit","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-TBN\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-TBN\u003c\/strong\u003e FLEX I\/O Terminal Base Unit, operates as a dedicated hardware component for field signal termination and backplane bus routing within FLEX I\/O control systems.\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 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\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive backplane load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e250 VAC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e10 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size\u003c\/td\u003e\n\u003ctd\u003e22 to 12 AWG (0.35 to 2.5 mm sq)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Rating\u003c\/td\u003e\n\u003ctd\u003e50 to 60 Hz\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\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e16 I\/O Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Terminals\u003c\/td\u003e\n\u003ctd\u003e2 Common Terminals\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\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Format\u003c\/td\u003e\n\u003ctd\u003eDIN-rail \/ Panel Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFirmware Flash Compatibility and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe 1794-TBN terminal base provides physical interconnectivity and signal scaling for high-density 16-point FLEX I\/O modules without requiring hardware firmware flashing. It establishes high-bandwidth signal paths between field sensors and the backplane adapter while maintaining strict channel isolation up to 250 V. Designed for high I\/O density scaling across backplane networks, the passive terminal routing maintains deterministic communication velocity and eliminates data packet distortion during parallel field signal updates to host controller nodes.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does removing the active I\/O module attached to the 1794-TBN interrupt backplane communications to downstream modules?\u003c\/p\u003e\n\u003cp\u003eA: No. The internal backplane bus pass-through circuit is contained entirely within the 1794-TBN base structure, enabling Removal and Insertion Under Power (RIUP) of the active module without disrupting adjacent network nodes.\u003c\/p\u003e\n\u003cp\u003eQ: What is the primary difference between the 1794-TBN and standard FLEX I\/O terminal bases?\u003c\/p\u003e\n\u003cp\u003eA: The 1794-TBN utilizes NEMA-style screw-clamp terminations rated for higher terminal tightening torque (1.4 Nm) and operating temperatures up to 70 deg C, providing enhanced mechanical retention in severe vibration environments.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the terminal base onto an earth-grounded 35 mm DIN rail, verifying that the rear rail locking latch engages completely.\u003c\/li\u003e\n\u003cli\u003eSlide the unit laterally against the adjacent base or adapter module until the backplane expansion connectors seat fully.\u003c\/li\u003e\n\u003cli\u003eWire field conductors to the 16 I\/O terminals using 22 to 12 AWG wire, torquing screw terminals precisely to 1.4 Nm (12 lb-in).\u003c\/li\u003e\n\u003cli\u003eTerminate common supply lines to the 2 dedicated common terminals to form a continuous return pathway.\u003c\/li\u003e\n\u003cli\u003eEnsure the base grounding plate makes clean, paint-free metallic contact with the DIN rail to preserve EMC isolation performance.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48761466388670,"sku":"1794-TBN","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1794-TBN_2_a9a9211d-5a7e-40cf-9558-9137acacf8b0.png?v=1787197855","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1794-tbn-flex-i-o-nema-terminal-base-unit","provider":"AutoOilTech Limited","version":"1.0","type":"link"}