{"product_id":"allen-bradley-1797-tb3-terminal-base-unit","title":"Allen-Bradley 1797-TB3 Terminal Base Unit","description":"\u003ch2\u003eAllen-Bradley 1797-TB3 Terminal Base Unit\u003c\/h2\u003e\n\u003cp\u003eConfigured for FLEX Ex I\/O module field wiring and signal routing in FLEX Ex I\/O systems, the \u003cstrong\u003eAllen-Bradley 1797-TB3\u003c\/strong\u003e (\u003cstrong\u003e1797-TB3\u003c\/strong\u003e Terminal Base Unit) provides direct physical\/electrical execution through terminal connections and the Flex Ex backplane interface.\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\u003e1797-TB3\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.49 lb\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\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eFLEX Ex I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003e3-tier Cage Clamp \/ Screw Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Terminals\u003c\/td\u003e\n\u003ctd\u003e36 terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Module Capacity\u003c\/td\u003e\n\u003ctd\u003e1 FLEX Ex I\/O module per base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Voltage\u003c\/td\u003e\n\u003ctd\u003e10 VDC to 30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Current Capacity\u003c\/td\u003e\n\u003ctd\u003e10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Size Range\u003c\/td\u003e\n\u003ctd\u003e0.33 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\u003eWiring Torque\u003c\/td\u003e\n\u003ctd\u003e0.5 to 0.6 Nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Rating\u003c\/td\u003e\n\u003ctd\u003eIP20 (NEMA Type 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Method\u003c\/td\u003e\n\u003ctd\u003e35 x 7.5 mm DIN rail or direct panel mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +85 deg C\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\u003eKeying Positions\u003c\/td\u003e\n\u003ctd\u003e8-position mechanical keying\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP Deterministic Network and Firmware Flash Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley FLEX Ex platform uses structured hardware identification and configuration management for I\/O assemblies. The 1797-TB3 provides the physical base connection required for FLEX Ex I\/O modules, allowing module-specific firmware compatibility checks and controller configuration validation during system maintenance activities. The terminal base routes power and backplane signals without providing independent processing or communication functions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1797-TB3 support multiple FLEX Ex I\/O modules on one terminal base?\u003cbr\u003eA: No. The 1797-TB3 is designed for one FLEX Ex I\/O module per terminal base unit.\u003c\/p\u003e\n\u003cp\u003eQ: What wiring connection method is used on the 1797-TB3?\u003cbr\u003eA: The unit uses 3-tier Cage Clamp \/ screw terminal connections for field wiring termination.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1797-TB3 provide active signal processing or control logic?\u003cbr\u003eA: No. The 1797-TB3 is a passive terminal base unit that provides mounting, wiring termination, and Flex Ex backplane routing functions.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1797-TB3 on a compatible DIN rail or panel mounting surface according to the mechanical installation requirements of the FLEX Ex system.\u003c\/p\u003e\n\u003cp\u003eUse copper field wiring within the specified conductor size range and maintain correct terminal tightening torque during installation. Separate signal wiring from high-voltage power conductors to reduce electrical interference.\u003c\/p\u003e\n\u003cp\u003eVerify the mechanical keying position before inserting a FLEX Ex I\/O module. Confirm terminal assignments, module orientation, and backplane engagement before applying system power.\u003c\/p\u003e\n\u003cp\u003eFor hazardous area installations, follow the applicable intrinsic safety system design rules, enclosure requirements, grounding practices, and local electrical regulations\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43787631329370,"sku":"1797-TB3","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1797-TB32.jpg?v=1785914752","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1797-tb3-terminal-base-unit","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}