{"product_id":"allen-bradley-1794-tb3k-flex-i-o-conformal-coated-terminal-base-unit","title":"Allen-Bradley 1794-TB3K FLEX I\/O Conformal Coated Terminal Base Unit","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1794-TB3K\u003c\/strong\u003e is a specialized, ruggedized mounting and wiring component designed for the \u003cstrong\u003eFLEX I\/O\u003c\/strong\u003e distributed modular platform. This industrial hardware component forms the essential baseline configuration for remote I\/O terminal assemblies, combining field-side sensor\/actuator wiring points with an integrated backplane bus matrix. This specific variant features factory-applied conformal coating protection, which shields internal circuitry from corrosive atmospheric agents, humidity, and airborne contaminants often encountered in harsh operating areas.\u003c\/p\u003e\n\u003cp\u003eEquipped with a three-tier terminal block configuration, the unit provides thirty-six individual termination screws to manage discrete or analog signals, power distribution paths, and common ground lines separately. The \u003cstrong\u003e1794-TB3K\u003c\/strong\u003e establishes backplane structural links via an integrated male\/female FlexBus connector side-assembly, enabling continuous data and power transfer across the complete local modular cluster. It is standard in heavy-duty processing industries—such as wastewater treatment plants, offshore drilling platforms, pulp and paper processing plants, and chemical synthesis installations—requiring resilience against ambient environmental degradation.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFactory conformal coating providing enhanced corrosion and moisture protection for reliability in harsh locations.\u003c\/li\u003e\n\u003cli\u003eThree-tier termination design separating active signal lanes, power supply buses, and ground return connections.\u003c\/li\u003e\n\u003cli\u003eIntegrated slide-and-lock FlexBus connectors facilitating modular backplane scaling on a single rail.\u003c\/li\u003e\n\u003cli\u003eIndependent operational design allowing processing modules to be hot-swapped without removing field wiring.\u003c\/li\u003e\n\u003cli\u003eBuilt-in mechanical alignment keys ensuring correct module matching and secure physical seating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWastewater and sewage purification processing control panels.\u003c\/li\u003e\n\u003cli\u003eChemical refining and corrosive chemical batching plants.\u003c\/li\u003e\n\u003cli\u003eMarine processing platforms and coastal automation installations.\u003c\/li\u003e\n\u003cli\u003ePulp, paper, and heavy mineral milling processing machinery.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical 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\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation \/ Allen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1794-TB3K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent Type\u003c\/td\u003e\n\u003ctd\u003eConformal Coated Terminal Base Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTermination Type\u003c\/td\u003e\n\u003ctd\u003e3-Tier Screw Clamp Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Terminal Points\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size Capacity\u003c\/td\u003e\n\u003ctd\u003e0.34 mm2 to 2.5 mm2 (22 to 12 AWG) solid or stranded copper wire\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 N-m (5.0 to 7.0 lb-in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e31.2V DC \/ 132V AC maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Capacity\u003c\/td\u003e\n\u003ctd\u003e10 A maximum per power bus, 2 A maximum per signal terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Type\u003c\/td\u003e\n\u003ctd\u003eConformal coated circuit board substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 degC\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\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.14 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e94 mm x 94 mm x 69 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eTerminal Row Designation\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction \/ Termination Allocation\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow A (Top Tier)\u003c\/td\u003e\n\u003ctd\u003eInput \/ Output signal wire connection nodes 0 through 15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow B (Middle Tier)\u003c\/td\u003e\n\u003ctd\u003eSourcing power supply voltage distribution terminals (+V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow C (Bottom Tier)\u003c\/td\u003e\n\u003ctd\u003eCommon signal reference return and chassis grounding links (COM\/GND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003ch3\u003eDIN Rail Mounting\u003c\/h3\u003e\n\u003cp\u003eCatch the upper rear mounting claws of the assembly block onto the top edge of a standard zinc-plated 35 mm DIN rail. Press down and inward firmly on the lower edge of the enclosure until the spring-loaded metallic retaining clip snaps over the bottom track rail.\u003c\/p\u003e\n\u003ch3\u003eBackplane Connection\u003c\/h3\u003e\n\u003cp\u003eAlign the side-facing male FlexBus pins of the new unit with the matching female socket of the existing module or network adapter on the rail. Slide the base laterally until the two housings mate flush and the interlocking retention clips engage.\u003c\/p\u003e\n\u003ch3\u003eField Wiring Termination\u003c\/h3\u003e\n\u003cp\u003eStrip the insulation from the incoming field conductors to a length of approximately 7 mm. Insert the bare copper wire fully into the designated screw clamp receptacle and tighten the terminal screw to a torque rating between 0.56 and 0.79 N-m.\u003c\/p\u003e\n\u003ch3\u003eCorrosion Protection Preservation\u003c\/h3\u003e\n\u003cp\u003eKeep the protective cover plates over the FlexBus interface connections if adjacent slots on the DIN rail remain unpopulated. Avoid scratching the interior base board during cleaning or module replacement to prevent damaging the factory conformal coating film layer.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat distinguishes this base unit from a standard 1794-TB3 model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis unit features a factory-applied conformal coating layer on its internal circuit board components to provide extra protection against harsh environmental contaminants.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this unit be mixed with non-conformal coated modules on the same rail?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, it is physically and electrically compatible with standard modules, though the complete system should be coated to achieve full environmental resilience.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat wire gauge range can the terminal screws safely accommodate?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe terminal blocks accept solid or stranded copper conductors ranging from 22 AWG up to 12 AWG.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this component support the hot-swapping of operational I\/O modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, it allows electronic application modules to be removed and inserted under power without requiring the removal of field wires or shutting down the bus adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs an external power supply run directly to this terminal block?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, field-side sensor and actuator supply voltage must be wired to the Row B terminals to distribute power across the module points.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum current limit permitted per signal terminal?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEach independent signal terminal screw is rated to handle a continuous current flow of up to 2 A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the unit connect to the main system programmable logic controller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt links back to the main controller through a communications adapter module positioned at the leftmost position of the local DIN rail track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this unit handle alternating current field instrumentation loops?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the electrical insulation design allows for switching signals up to a maximum rating of 132V AC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat tools are required to mount the base onto the DIN rail?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo tools are required for mounting, as the unit snaps directly onto the rail, but a flat-head screwdriver can be used to release the lower latch during removal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum torque recommendation for the terminal clamp screws?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe screws should be tightened to a value within the 0.56 to 0.79 N-m range to prevent stripping while maintaining low contact resistance.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695188242795,"sku":"1794-TB3K","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1794-tb3k-base-unit-u4i2p54k140_269078ed-092a-4403-a3a5-8508c4527cfc.jpg?v=1766114541","url":"https:\/\/www.plcprotech.com\/hu\/products\/allen-bradley-1794-tb3k-flex-i-o-conformal-coated-terminal-base-unit","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}