{"product_id":"allen-bradley-1797-tb3s-terminal-base-unit","title":"Allen-Bradley 1797-TB3S Terminal Base Unit","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1797-TB3S\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1797-TB3S\u003c\/strong\u003e Terminal Base Unit, operates as a dedicated hardware component for intrinsically safe field wiring termination within FLEX Ex I\/O networks. This DIN-rail mounted base provides 52 spring-clamp termination points arranged in three distinct rows to facilitate direct electrical interconnections between hazardous area field devices and installed FLEX Ex intrinsically safe I\/O modules.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eTerminal Type\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eTotal Terminals\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eRow Layout Configuration\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSystem Architecture\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1797-TB3S\u003c\/td\u003e\n\u003ctd\u003eSpring Clamp\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003ctd\u003e2 Rows x 18 Terminals, 1 Row x 16 Terminals\u003c\/td\u003e\n\u003ctd\u003eFLEX Ex Hazardous Area (Ex i)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1797-TB3\u003c\/td\u003e\n\u003ctd\u003eScrew Clamp\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003ctd\u003e2 Rows x 18 Terminals, 1 Row x 16 Terminals\u003c\/td\u003e\n\u003ctd\u003eFLEX Ex Hazardous Area (Ex i)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003e1797-TB3S\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\u003e0.37 kg (0.81 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard FLEX Ex Terminal Base Form Factor\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\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive Backplane Bus Interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Count\u003c\/td\u003e\n\u003ctd\u003e52 Spring-Clamp Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Layout\u003c\/td\u003e\n\u003ctd\u003e2 Rows of 18 Terminals, 1 Row of 16 Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003eChannel-to-channel isolation determined by installed module\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\u003eShock Resistance\u003c\/td\u003e\n\u003ctd\u003eTested up to 15 g operational shock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Backplane Bus Communications and Intrinsic Safety Execution\u003c\/h3\u003e\n\u003cp\u003eThe 1797-TB3S base unit establishes direct backplane bus communication velocity and power routing for intrinsically safe (Ex i) FLEX Ex I\/O modules. Operating within deterministic EtherNet\/IP or ControlNet topologies, the internal copper bus traces deliver high-density I\/O signal routing without introducing electrical impedance that could jeopardize intrinsically safe entity parameters. The mechanical keying mechanism ensures firmware flash compatibility and prevents incorrect module insertion into hazardous location backplanes.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1797-TB3S support live module insertion and removal (RIUP\/hot-swapping) in hazardous environments?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the 1797-TB3S terminal base permits hot-swapping of FLEX Ex modules under power, provided the installed module maintains intrinsic safety ratings and the backplane connector shield remains grounded.\u003c\/p\u003e\n\u003cp\u003eQ: What wire gauge range is supported by the spring-clamp terminals on the 1797-TB3S?\u003c\/p\u003e\n\u003cp\u003eA: The spring-clamp mechanism accommodates solid or stranded copper conductors ranging from 0.5 mm2 to 2.5 mm2 (22 AWG to 12 AWG) rated for hazardous location wiring requirements.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eSnap the 1797-TB3S securely onto a standard 35 mm DIN rail (EN 50022), verifying that the grounding spring establishes a solid electrical link to the grounded metal rail.\u003c\/li\u003e\n\u003cli\u003eAlign the mechanical keyswitch on the terminal base to match the specific keying position required by the selected FLEX Ex I\/O module before installing the active hardware.\u003c\/li\u003e\n\u003cli\u003eStrip field conductor insulation to 10 mm (0.4 in), insert a flathead screwdriver into the spring release slot, insert the wire fully into the terminal clamp, and release to lock.\u003c\/li\u003e\n\u003cli\u003eMaintain strict physical separation (minimum 50 mm clearance) between intrinsically safe (Ex i) field wiring connected to the 1797-TB3S and non-intrinsically safe wiring conductors within the enclosure.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52783447998744,"sku":"1797-TB3S","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1797-TB3S2_3f883738-b266-4325-9dfb-5611711465be.png?v=1790583933","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1797-tb3s-terminal-base-unit","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}