{"product_id":"allen-bradley-1794-tb3g-terminal-base-units","title":"Allen-Bradley 1794-TB3G Terminal Base Units","description":"\u003cp\u003eConfigured for high-density wiring termination in Flex I\/O backplane architectures, the \u003cstrong\u003eAllen-Bradley 1794-TB3G\u003c\/strong\u003e (\u003cstrong\u003e1794-TB3G\u003c\/strong\u003e Terminal Base Unit) provides direct physical\/electrical execution. This 3-wire grounded screw-terminal base provides pass-through signal connection paths and power bus distribution for compatible 1794 Flex I\/O functional modules without interrupting field wiring circuits during module swap operations.\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-TB3G\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\u003e0.26 kg (0.56 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 1794 Base Form Factor\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\u003ePassive Base Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e31.2 VAC\/DC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLine Frequency Range\u003c\/td\u003e\n\u003ctd\u003e50 to 60 Hz\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\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e2500 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size\u003c\/td\u003e\n\u003ctd\u003e24 to 16 AWG\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\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration Resistance\u003c\/td\u003e\n\u003ctd\u003e5 g @ 10 to 500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication and Signal Routing Integrity\u003c\/h3\u003e\n\u003cp\u003eThe 1794-TB3G integrates an internal backplane bus interface designed to maintain backplane bus communication velocity and signal continuity across adjacent Flex I\/O modules. The internal bus structure carries deterministic control signals and field power across the DIN-rail mounted cluster. Channel-to-channel and bus-to-field isolation limits are strictly enforced up to 2500 VDC to prevent common-mode noise propagation across backplane lines. The grounded terminal layout suppresses signal cross-talk and EMI interference, stabilizing analog and discrete I\/O signal transmission paths across EtherNet\/IP and ControlNet adapter nodes.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1794-TB3G terminal base remain fully wired while replacing an I\/O module?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The base unit retains all physical field wiring connections, allowing the upper 1794 functional I\/O module to be removed and installed under RIUP (Removal and Insertion Under Power) guidelines without disturbing field circuit terminations.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum allowable wire gauge and torque for terminal connection screws?\u003c\/p\u003e\n\u003cp\u003eA: The terminal blocks accept solid or stranded conductors ranging from 24 to 16 AWG. Screw terminals must be tightened to a torque specification between 0.56 and 0.79 Nm to maintain electrical contact stability and prevent thread stripping.\u003c\/p\u003e\n\u003cp\u003eQ: How does isolation voltage protection operate on this base unit?\u003c\/p\u003e\n\u003cp\u003eA: The unit features a 2500 VDC galvanic isolation barrier engineered to separate field-side power and signal wiring from the low-voltage backplane logic bus, protecting backplane communication links from field surges.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIN-Rail Mounting\u003c\/strong\u003e: Latch the 1794-TB3G securely onto a standard 35 mm DIN rail (EN 50022). Ensure the backplane connectors on adjacent bases interlock firmly to maintain backplane bus continuity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Wiring\u003c\/strong\u003e: Strip conductors back to manufacturer length specifications. Terminate signal wires into designated screw terminals using wire sizes from 24 to 16 AWG. Torque all terminal screws to 0.56–0.79 Nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding\u003c\/strong\u003e: Connect cable shields to designated ground terminals on the base or to a central cabinet earth bus. Maintain low-impedance ground bonding to maximize noise immunity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Routing\u003c\/strong\u003e: Verify supply voltage levels do not exceed 31.2 VAC\/DC and total bus current load does not exceed 10 A prior to applying line power.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52786946998552,"sku":"1794-TB3G","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1794-TB3S_Cocoai_1.jpg?v=1790653325","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1794-tb3g-terminal-base-units","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}