{"product_id":"allen-bradley-1794-tb3gm-flex-i-o-terminal-base-unit","title":"Allen-Bradley 1794-TB3GM FLEX I\/O Terminal Base Unit","description":"\u003ch2\u003eAllen-Bradley 1794-TB3GM FLEX I\/O Terminal Base Unit\u003c\/h2\u003e\n\u003cp\u003eConfigured for 3-wire field device termination in FLEX I\/O backplane systems, the \u003cstrong\u003eAllen-Bradley 1794-TB3GM\u003c\/strong\u003e (\u003cstrong\u003e1794-TB3GM\u003c\/strong\u003e Terminal Base Unit) provides direct physical\/electrical execution for I\/O module wiring, power routing, and communication connection through the FLEX I\/O backplane bus.\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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-TB3GM\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive terminal base; no external power consumption\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eSpring-clamp connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTermination Style\u003c\/td\u003e\n\u003ctd\u003e3-wire (Signal, V\/Common, Ground)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Terminals\u003c\/td\u003e\n\u003ctd\u003e36 I\/O terminals (16 Signal, 18 Common\/Voltage, 2 Ground)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e125 V AC\/DC maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Capacity\u003c\/td\u003e\n\u003ctd\u003e10 A maximum through terminal strip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size Range\u003c\/td\u003e\n\u003ctd\u003e0.33 to 1.3 mm2 (22 to 16 AWG) solid or stranded copper wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Strip Length\u003c\/td\u003e\n\u003ctd\u003e9.5 mm +\/- 1.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKeyswitch Positions\u003c\/td\u003e\n\u003ctd\u003e1 through 12 configurable based on attached I\/O module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Method\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN rail or panel\/wall mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen-style\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProfinet \/ EtherNet-IP Deterministic Networks and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe 1794-TB3GM operates as a FLEX I\/O terminal base component within Allen-Bradley distributed I\/O architectures. The unit provides the mechanical interface and electrical routing path between field wiring and FLEX I\/O modules through the terminal base backplane connection.\u003c\/p\u003e\n\u003cp\u003eThe 3-wire terminal arrangement supports separate signal, common\/voltage, and grounding connections for field devices such as proximity sensors, analog transmitters, and actuators requiring chassis ground reference. The spring-clamp termination method maintains conductor retention without screw torque adjustment.\u003c\/p\u003e\n\u003cp\u003eThe mechanical keyswitch system provides module type identification by configurable key positions from 1 through 12, preventing installation of incompatible FLEX I\/O modules into the terminal base assembly.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1794-TB3GM provide active signal processing or power conversion?\u003cbr\u003eA: No. The 1794-TB3GM is a passive terminal base unit providing field wiring termination, module mounting, and backplane connection functions.\u003c\/p\u003e\n\u003cp\u003eQ: What hot-swap limitations apply to the terminal base unit?\u003cbr\u003eA: The terminal base unit must be installed according to FLEX I\/O system procedures. Module removal or replacement conditions depend on the installed I\/O module and system operating requirements.\u003c\/p\u003e\n\u003cp\u003eQ: Can multiple terminal bases share power and common connections?\u003cbr\u003eA: Yes. The unit supports daisy-chain wiring arrangements for power and common connections between adjacent terminal bases when configured according to system wiring requirements.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1794-TB3GM on a compatible 35 mm DIN rail or approved panel mounting surface. Verify that the terminal base keyswitch position matches the intended FLEX I\/O module before module insertion.\u003c\/p\u003e\n\u003cp\u003eTerminate field conductors according to the specified wire size range and maintain correct separation between signal wiring, common connections, and grounding conductors. Use appropriate cabinet grounding practices and connect shield drain wires according to the system grounding design.\u003c\/p\u003e\n\u003cp\u003eRoute communication and power wiring separately from high-voltage switching conductors to reduce electrical interference. Confirm that all spring-clamp terminals are fully engaged and that conductors are securely retained before system energization.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43783161151578,"sku":"1794-TB3GM","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-TB3GK1.jpg?v=1785823751","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-tb3gm-flex-i-o-terminal-base-unit","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}