{"product_id":"1756-cn2r-allen-bradley-controllogix-controlnet-bridge-module","title":"Module pont ControlNet ControlLogix Allen-Bradley 1756-CN2R","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-CN2R\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance ControlNet bridge module belonging to the Allen-Bradley ControlLogix platform. It is specifically designed to facilitate high-speed, deterministic communication in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eredundant network topologies\u003c\/strong\u003e. Featuring dual BNC ports, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-CN2R\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eallows for a \"bumpless\" switchover between media cables, ensuring that critical industrial processes remain online even if one network path is compromised.\u003c\/p\u003e\n\u003cp\u003eSupporting up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e99 nodes\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand a data rate of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5 Mbps\u003c\/strong\u003e, this module is a cornerstone for Distributed I\/O architectures, HMI\/SCADA connectivity, and peer-to-peer controller interlocking. Its ability to cover up to 1,000 meters per segment (extendable via repeaters) makes it an ideal solution for large-scale manufacturing facilities and process plants that require time-critical data exchange via the Common Industrial Protocol (CIP).\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe 1756-CN2R is engineered for maximum availability and system flexibility:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRedundant Media Support:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDual BNC ports provide two independent paths for ControlNet signals, protecting against cable breaks or connector failures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Connection Capacity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e128 Logix connections\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand a total of 131 communication connections, allowing for extensive I\/O and messaging tasks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMaintenance Port:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncludes a front-facing USB 1.1 port (12 Mbps) dedicated to local configuration, programming, and firmware updates (not intended for runtime data communication).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Environmentals:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesigned for a wide operating temperature range (0 to 60 °C) and high vibration resistance (2G at 10-500Hz), suitable for demanding cabinet environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChassis Versatility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCompatible with all standard 1756 ControlLogix chassis (A4 through A17) and both standard and redundant power supply configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1756-CN2R\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley (Rockwell Automation)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eControlNet Bridge (Redundant)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eData Rate\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5 Mbps\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNodes (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e99\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eLogix Connections\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e128\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTotal Connections\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e131\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1300 mA @ 5.1V DC \/ 3 mA @ 24V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6.7 Watts (22.9 BTU\/hr)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (HxWxD)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.51 x 4.41 x 5.71 in\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.43 kg (0.94 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat cable is required for the 1756-CN2R?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module requires\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1786-RG6\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003equad-shield RG6 coaxial cable. Proper termination with 75-ohm resistors at the ends of the trunk line is mandatory for network stability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the USB port be used for HMI communication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The USB port is strictly for temporary maintenance tasks, such as configuring the module via RSLinx or flashing firmware. Runtime data communication must occur over the ControlNet BNC ports.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support \"Hot Swapping\"?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Like most 1756 modules, the 1756-CN2R supports Removal and Insertion Under Power (RIUP), allowing you to replace the module without cycling power to the entire chassis.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eRedundant Cabling Strategy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo achieve true redundancy, route the two BNC coaxial cables (Channel A and Channel B) through different physical paths or conduits. This minimizes the risk of a single mechanical event (like a forklift accident or fire) severing both communication lines simultaneously.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Scheduling\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery ControlNet network containing a 1756-CN2R must be scheduled using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRSNetWorx for ControlNet\u003c\/strong\u003e. This software establishes the Network Update Time (NUT) and ensures that deterministic data (Scheduled) and non-critical data (Unscheduled) are prioritized correctly. Failing to \"save to the keeper\" after making hardware changes will result in I\/O communication failures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower and Grounding\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEnsure the chassis is properly grounded to a low-impedance earth ground. The 1756-CN2R has an isolation voltage of 30V continuous, tested at 500V. Proper grounding is critical for the BNC shields to prevent electromagnetic interference (EMI) from corrupting the 5 Mbps data stream.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695190667627,"sku":"1756-CN2R","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1756-cn2r-controlnet-communication-module-0s3lkivwraf_0488d9b5-2aa6-4aa2-87ad-e441d7973b10.jpg?v=1766114615","url":"https:\/\/www.plcprotech.com\/fr\/products\/1756-cn2r-allen-bradley-controllogix-controlnet-bridge-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}