{"product_id":"allen-bradley-1786-bnc-controlnet-coaxial-media-tap","title":"Allen-Bradley 1786-BNC ControlNet Coaxial Media Tap","description":"\u003ch2\u003eAllen-Bradley 1786-BNC ControlNet Coaxial Media Tap\u003c\/h2\u003e\n\u003cp\u003eConfigured for physical layer connection and drop signal distribution in ControlNet networks, the \u003cstrong\u003eAllen-Bradley 1786-BNC\u003c\/strong\u003e (\u003cstrong\u003e1786-BNC\u003c\/strong\u003e ControlNet Coaxial Media Tap) provides direct physical\/electrical execution.\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\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 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive device (0 W)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia Type\u003c\/td\u003e\n\u003ctd\u003eRG-6 quad-shield coaxial cable (1786-RG6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eBNC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Protocol\u003c\/td\u003e\n\u003ctd\u003eControlNet coaxial physical layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Nodes per Segment\u003c\/td\u003e\n\u003ctd\u003e48 nodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tap Spacing\u003c\/td\u003e\n\u003ctd\u003e1 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpedance \/ Termination\u003c\/td\u003e\n\u003ctd\u003e75 ohms (1786-XT required at trunk ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration\u003c\/td\u003e\n\u003ctd\u003e10 g peak, 10 to 500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock\u003c\/td\u003e\n\u003ctd\u003e30 g operating, 50 g non-operating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental Protection\u003c\/td\u003e\n\u003ctd\u003eIP67 when fully mated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlNet Coaxial Determinism \u0026amp; Network Integrity\u003c\/h3\u003e\n\u003cp\u003eIn industrial ControlNet architectures using the Allen-Bradley 1786-BNC, deterministic data delivery depends strictly on physical layer signal integrity across the RG-6 coaxial trunk line. The media tap introduces a controlled attenuation drop without disturbing trunk impedance when nodes are connected or disconnected. Maintaining a deterministic network requires adherence to physical constraints, including the maximum limit of 48 nodes per segment and maintaining strict 75-ohm characteristic impedance across the entire cable run. Improper tap distribution or missing 75-ohm line terminators (1786-XT) causes high-frequency signal reflections, degrading the deterministic signal timing and generating frame errors across the backplane bus communication link.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can a ControlNet node be disconnected from the 1786-BNC tap without interrupting overall network communication?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the 1786-BNC passive internal design allows node connection and removal via the drop line without disrupting the continuity of the main RG-6 coaxial trunk line.\u003c\/p\u003e\n\u003cp\u003eQ: What is the minimum physical spacing requirement between adjacent 1786-BNC taps on a single trunk segment?\u003c\/p\u003e\n\u003cp\u003eA: A minimum physical distance of 1 m must be maintained between adjacent taps along the RG-6 trunk cable to prevent impedance mismatches and destructive signal reflections.\u003c\/p\u003e\n\u003cp\u003eQ: Is standard commercial RG-6 coaxial cable compatible with the 1786-BNC media tap?\u003c\/p\u003e\n\u003cp\u003eA: No, standard commercial or TV RG-6 cable is not permitted. The physical layer requires quad-shielded ControlNet-rated coaxial cable, such as Allen-Bradley 1786-RG6, to maintain target noise immunity and signal impedance.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eVerify that both physical ends of the RG-6 coaxial trunk line are terminated with standard 75-ohm coaxial terminators (1786-XT) prior to energizing connected nodes.\u003c\/li\u003e\n\u003cli\u003eMaintain a minimum separation distance of 1 m between consecutive 1786-BNC taps along the trunk segment to ensure signal reflection attenuation.\u003c\/li\u003e\n\u003cli\u003eRoute RG-6 coaxial trunk cabling through separate metal conduits or maintain at least 200 mm physical clearance from high-voltage power lines and variable frequency drive motor cables to reduce electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eEnsure all BNC bayonet connectors are fully locked and mated to achieve the IP67 ingress protection rating. Inspect connections periodically in high-humidity or corrosive environments.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43755485954138,"sku":"1786-BNC","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1786-BNC2.jpg?v=1785305846","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1786-bnc-controlnet-coaxial-media-tap","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}