{"product_id":"allen-bradley-1786-bnc-b-controlnet-coaxial-taps","title":"Allen-Bradley 1786-BNC\/B ControlNet Coaxial Taps","description":"\u003ch2\u003eAllen-Bradley 1786-BNC\/B ControlNet Coaxial Taps\u003c\/h2\u003e\n\u003cp\u003eConfigured for high-speed deterministic token-pass signal tapping in ControlNet installations, the \u003cstrong\u003eAllen-Bradley 1786-BNC\/B\u003c\/strong\u003e (\u003cstrong\u003e1786-BNC\u003c\/strong\u003e Coaxial Media Tap) provides direct physical execution of node drop connections without interrupting trunk cable integrity.\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-BNC\/B\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\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e58.4 mm x 36.0 mm x 41.9 mm\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\u003ePassive Component (0 W)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia Type\u003c\/td\u003e\n\u003ctd\u003eRG-6 ControlNet Coaxial Trunk Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eBNC (Bayonet Neill-Concelman)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Nodes\u003c\/td\u003e\n\u003ctd\u003e48 nodes per network segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tap Spacing\u003c\/td\u003e\n\u003ctd\u003e1 m between adjacent taps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrunk Termination\u003c\/td\u003e\n\u003ctd\u003e75 ohm (1786-XT required at trunk line ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIngress Protection\u003c\/td\u003e\n\u003ctd\u003eIP67 (when fully mated)\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\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5-95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration \/ Shock\u003c\/td\u003e\n\u003ctd\u003e10 g peak at 10-500 Hz \/ 30 g operating shock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Network Taps \u0026amp; Bus Infrastructure\u003c\/h3\u003e\n\u003cp\u003eThe hardware executes deterministic signal coupling onto the backplane and drop cable layer without injecting active propagation delay. Proper physical layer impedance matching is maintained across the passive circuitry to minimize signal reflections and standing waves on high-velocity ControlNet segments running at 5 Mbps. Utilizing robust coaxial BNC connections, the tap module protects network signaling integrity against high electrical noise environments and maintains signal fidelity across all 48 potential node drops.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1786-BNC\/B draw any electrical power from the ControlNet trunk cable or backplane?\u003c\/p\u003e\n\u003cp\u003eA: No. The 1786-BNC\/B is an entirely passive signal-coupling device. It contains no active semiconductor components and draws zero current from the network or connected nodes.\u003c\/p\u003e\n\u003cp\u003eQ: What happens if tap spacing along the RG-6 trunk cable is less than 1 m?\u003c\/p\u003e\n\u003cp\u003eA: Spacing taps closer than 1 m causes cumulative impedance mismatches and signal reflections on the 5 Mbps ControlNet coaxial trunk line, leading to packet frame errors and potential node dropouts.\u003c\/p\u003e\n\u003cp\u003eQ: Can standard residential-grade RG-6 coaxial cable be used with this tap?\u003c\/p\u003e\n\u003cp\u003eA: No. Quad-shielded, quad-braid industrial ControlNet-rated cable (such as Allen-Bradley 1786-RG6) must be used. Standard commercial RG-6 lacks the exact impedance tolerances and shield effectiveness required for industrial noise immunity.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the tap securely using the integrated mounting screw to a clean, grounded panel surface or dedicated enclosure interior.\u003c\/li\u003e\n\u003cli\u003eRoute the RG-6 coaxial trunk cable maintaining a minimum bending radius of 76 mm to prevent physical deformation of the dielectric core.\u003c\/li\u003e\n\u003cli\u003eKeep coaxial cable runs separated from high-voltage AC wiring and variable frequency drive (VFD) output leads by at least 200 mm to prevent electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eVerify that 75-ohm terminators (Allen-Bradley 1786-XT) are installed at both physical ends of the ControlNet trunk line segment.\u003c\/li\u003e\n\u003cli\u003eEnsure BNC bayonet connectors are turned and fully locked into position to maintain the IP67 seal integrity and low-resistance shield contact.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43755541758042,"sku":"1786-BNC\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1786-BNCB.jpg?v=1785306042","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1786-bnc-b-controlnet-coaxial-taps","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}