{"product_id":"allen-bradley-1756-cnbr-controllogix-controlnet-redundant-bridge","title":"Allen-Bradley 1756-CNBR ControlLogix ControlNet Redundant Bridge","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eAllen-Bradley 1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e is a high-speed communication bridge. It facilitates seamless data exchange between \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eControlLogix\u003c\/span\u003e\u003c\/strong\u003e backplanes and \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eControlNet\u003c\/span\u003e\u003c\/strong\u003e networks. This module features two BNC ports for redundant media support. It efficiently manages 5 Mbps transmission rates for scheduled and unscheduled data. Users should \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-CNBR.pdf?v=1774939489\"\u003edownload the official \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e user manual\u003c\/a\u003e for detailed wiring and configuration instructions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Series:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eControlLogix\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication Rate:\u003c\/strong\u003e 5 Mbps Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetwork Capacity:\u003c\/strong\u003e Up to 99 Nodes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLogix Connections:\u003c\/strong\u003e 40 to 48 Connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Connections:\u003c\/strong\u003e 64 Bidirectional Nodes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Current (5.1V DC):\u003c\/strong\u003e 970 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Current (24V DC):\u003c\/strong\u003e 1.7 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e 5.5 Watts Maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation Voltage:\u003c\/strong\u003e 30 Volts Continuous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0 to 60 Celsius (32 to 140 Fahrenheit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical Slot Width:\u003c\/strong\u003e 1 (Single Slot)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation and Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Support:\u003c\/strong\u003e Compatible with \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-A4\u003c\/span\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-A7\u003c\/span\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-A10\u003c\/span\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-A13\u003c\/span\u003e\u003c\/strong\u003e, and \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-A17\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supplies:\u003c\/strong\u003e Works with \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-PA72\u003c\/span\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-PB75\u003c\/span\u003e\u003c\/strong\u003e, and redundant \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-PA75R\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabling Requirements:\u003c\/strong\u003e Uses \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1786-RG6\u003c\/span\u003e\u003c\/strong\u003e quad-shield coaxial cable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgramming Port:\u003c\/strong\u003e Includes one (1) 8-pin RJ45 Network Access Port (NAP).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDiagnostics and Maintenance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual Monitoring:\u003c\/strong\u003e Integrated LED indicators display module health and network status.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia Supervision:\u003c\/strong\u003e Automatic switching occurs upon detection of trunkline failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTroubleshooting Efficiency:\u003c\/strong\u003e Built-in diagnostics identify node conflicts and tap reversal errors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration Ease:\u003c\/strong\u003e Local programming access via the front-facing NAP interface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eApplication and Suitability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess Control:\u003c\/strong\u003e Ideal for oil and gas refinery automation systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfrastructure:\u003c\/strong\u003e Suitable for large-scale water treatment and utility management.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing:\u003c\/strong\u003e Optimized for automotive assembly lines requiring high-speed interlocking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eData Bridging:\u003c\/strong\u003e Perfect for linking multiple \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eControlLogix\u003c\/span\u003e\u003c\/strong\u003e chassis across wide plant areas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping and Warranty Terms\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging List:\u003c\/strong\u003e One (1) Brand New \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e Module with original protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Period:\u003c\/strong\u003e Comprehensive 12-month quality assurance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch Time:\u003c\/strong\u003e Fast processing within 24-48 hours of order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLogistics Partners:\u003c\/strong\u003e Express delivery via \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, or \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePurchase and Selection Guide\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm your network requires media redundancy before selecting the \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eVerify your total connection requirements do not exceed 64 nodes.\u003c\/li\u003e\n\u003cli\u003eEnsure the chassis power supply can accommodate the 970 mA current draw.\u003c\/li\u003e\n\u003cli\u003eAlways use high-quality \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eRG6\u003c\/span\u003e\u003c\/strong\u003e cables to maintain signal integrity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 1756-CNBR operate with only one cable connected?\u003c\/strong\u003e\u003cbr\u003eYes, the module functions in simplex mode using only the primary port A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I prevent communication loss during installation?\u003c\/strong\u003e\u003cbr\u003eCheck tap drop cable labels to avoid accidental reversal of redundant connections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the NAP port intended for permanent monitoring?\u003c\/strong\u003e\u003cbr\u003eNo, use the NAP port for temporary configuration and local troubleshooting only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary difference from the standard 1756-CNB?\u003c\/strong\u003e\u003cbr\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1756-CNBR\u003c\/span\u003e\u003c\/strong\u003e adds a second BNC port to support physical media redundancy.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013808578742,"sku":"1756-CNBR","price":217.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-CNBR.jpg?v=1775126627","url":"https:\/\/www.plcsparehub.com\/products\/allen-bradley-1756-cnbr-controllogix-controlnet-redundant-bridge","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}