{"product_id":"allen-bradley-1786-xt-a-controlnet-coaxial-trunk-terminating-resistor","title":"Allen-Bradley 1786-XT\/A ControlNet Coaxial Trunk Terminating Resistor","description":"\u003ch2\u003eAllen-Bradley 1786-XT\/A ControlNet Coaxial Trunk Terminating Resistor\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1786-XT\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1786-XT\/A\u003c\/strong\u003e ControlNet coaxial terminating resistor, operates as a dedicated hardware component for impedance matching and signal reflection suppression within Allen-Bradley ControlNet deterministic communication networks.\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\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\u003e1786-XT\/A\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\u003e0.04 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive (None)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Impedance\u003c\/td\u003e\n\u003ctd\u003e75 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eBNC male connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Media\u003c\/td\u003e\n\u003ctd\u003eRG-6 coaxial cable\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eUL Listed, CE Marked, RoHS Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlNet Network Determinism \u0026amp; Bus Integrity\u003c\/h3\u003e\n\u003cp\u003eIn deterministic Fieldbus architectures, signal integrity depends directly on transmission line impedance matching across high-frequency backplane bus communication velocity Licences and physical trunk lines. The \u003cstrong\u003eAllen-Bradley 1786-XT\/A\u003c\/strong\u003e prevents signal reflections along RG-6 coaxial trunk segments by providing exact 75 Ω termination at physical network boundaries. Without precise line impedance matching, standing waves introduce packet loss, jitter, and node dropouts in deterministic EtherNet\/IP and ControlNet topologies.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Where must the 1786-XT\/A terminating resistor be physically placed in a ControlNet network?\u003c\/p\u003e\n\u003cp\u003eA: One 1786-XT\/A terminator must be connected directly to the open port of the BNC T-connector located at each of the two physical end-nodes of a coaxial trunk segment.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1786-XT\/A resistor require external DC power or backplane current?\u003c\/p\u003e\n\u003cp\u003eA: No. The 1786-XT\/A is a passive network component and consumes zero backplane or external DC electrical current.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure proper mechanical connection by twisting and fully latching the BNC male connector onto the standard BNC T-connector port.\u003c\/li\u003e\n\u003cli\u003eMaintain continuous shield grounding practices across the entire RG-6 coaxial cable run to minimize electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eVerify that exactly two 75 Ω terminating resistors are installed per isolated cable segment; under-termination or double-termination degrades communication waveform quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43757423231066,"sku":"1786-XT\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1786-XT1.jpg?v=1785314725","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1786-xt-a-controlnet-coaxial-trunk-terminating-resistor","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}