{"product_id":"allen-bradley-1794-tb3-a-flex-i-o-terminal-base-unit","title":"Allen-Bradley 1794-TB3\/A FLEX I\/O Terminal Base Unit","description":"\u003ch2\u003eAllen-Bradley 1794-TB3\/A FLEX I\/O Terminal Base Unit\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-TB3\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-TB3\u003c\/strong\u003e 3-Wire Terminal Base Unit, operates as a dedicated hardware component for field wiring termination and module mounting within the Allen-Bradley FLEX I\/O system. It provides the physical interface between field devices and installed FLEX I\/O modules through screw-clamp terminals.\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-TB3\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\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\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003e3-Wire Screw-Clamp Terminal Base Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Terminals\u003c\/td\u003e\n\u003ctd\u003e36 screw terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Wiring\u003c\/td\u003e\n\u003ctd\u003e3-wire signal, return, and power\/ground connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Screw Torque\u003c\/td\u003e\n\u003ctd\u003e0.86 Nm (7 lb-in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size Range\u003c\/td\u003e\n\u003ctd\u003e0.34 ... 2.1 mm2 (22 ... 14 AWG) solid or stranded copper wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e125 V AC\/DC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e10 A max through power terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Options\u003c\/td\u003e\n\u003ctd\u003e35 x 7.5 mm DIN rail or direct panel mounting\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 (-4 deg F to +158 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +85 deg C (-40 deg F to +185 deg F)\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\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e94 x 94 x 69 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.44 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and FLEX I\/O Bus Interface Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1794-TB3\/A functions as the terminal interface layer of the FLEX I\/O architecture, providing mechanical retention and electrical termination for compatible FLEX I\/O modules. The terminal base unit maintains field wiring separation and supports direct channel-level connections without additional external terminal blocks.\u003c\/p\u003e\n\u003cp\u003eThe FLEX I\/O system uses modular I\/O communication through the adapter and backplane interface. Proper module seating, terminal alignment, and wiring segregation maintain signal integrity for digital and analog I\/O channels connected through the terminal base assembly.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1794-TB3\/A be used as a standalone I\/O module?\u003cbr\u003eA: No. The 1794-TB3\/A is a terminal base unit and requires a compatible FLEX I\/O module installed on the base assembly to provide field signal processing.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1794-TB3\/A support direct 3-wire field device connection?\u003cbr\u003eA: Yes. The terminal arrangement provides screw-clamp connections for 3-wire field wiring, including signal, return, and power\/ground connections according to the installed I\/O module requirements.\u003c\/p\u003e\n\u003cp\u003eQ: Is the terminal base unit hot-swappable by itself?\u003cbr\u003eA: The 1794-TB3\/A is a passive mounting and wiring component. Hot-swap capability depends on the installed FLEX I\/O module, adapter configuration, and system operating conditions.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1794-TB3\/A on a compatible 35 mm DIN rail or approved panel mounting surface. Verify that the terminal base is mechanically secured before installing the FLEX I\/O module.\u003c\/p\u003e\n\u003cp\u003eTerminate field wiring using the specified conductor size range and apply the recommended terminal screw torque. Separate signal wiring from high-voltage power conductors to reduce electrical interference.\u003c\/p\u003e\n\u003cp\u003eConnect cable shields and grounding conductors according to the system grounding design. Confirm terminal assignments before energizing the circuit to prevent incorrect field device connections.\u003c\/p\u003e\n\u003cp\u003eMaintain adequate spacing for module removal and inspection access. Ensure environmental conditions remain within the specified operating temperature and humidity limits.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43782930038874,"sku":"1794-TB3\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-TB3A.jpg?v=1785822770","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-tb3-a-flex-i-o-terminal-base-unit","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}