{"product_id":"allen-bradley-1756-cnbr-controllogix-controlnet-interface-module","title":"Allen-Bradley 1756-CNBR ControlLogix ControlNet Interface Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-CNBR\u003c\/strong\u003e is a ControlLogix ControlNet interface module designed to provide high-speed, deterministic communication and media redundancy for ControlLogix chassis architectures. Operating within a ControlLogix system chassis, the module handles real-time data transfer, network scheduled connections, and backplane interface diagnostics. The \u003cstrong\u003e1756-CNBR\u003c\/strong\u003e module features dual ControlNet ports for redundant-media configurations, enabling reliable communication links across process control architectures and remote I\/O layouts. Up to five ControlLogix controllers can establish rack optimization connections to a single remote adapter module.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDual ControlNet connectors supporting redundant-media physical configurations.\u003c\/li\u003e\n\u003cli\u003eIntegrated 4-character diagnostic scrolling LED display showing module status, error messages, and unconnected buffer usage.\u003c\/li\u003e\n\u003cli\u003eInternal 16-bit minor fault counters for monitoring bandwidth, network errors, and ControlBus backplane errors via CIP generic messaging.\u003c\/li\u003e\n\u003cli\u003eControlNet International (CI) conformance tested for standard network compliance.\u003c\/li\u003e\n\u003cli\u003eOptimized for integration into ControlLogix Redundancy systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRedundant communication links in industrial ControlLogix PLC process control systems.\u003c\/li\u003e\n\u003cli\u003eRemote I\/O communication and rack optimization across ControlNet networks.\u003c\/li\u003e\n\u003cli\u003eInter-controller messaging and scheduled data exchange in automated architectures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCatalog Number\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-CNB\/D\u003c\/td\u003e\n\u003ctd\u003eControlLogix ControlNet Interface Module, Single-Media, Series D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-CNBR\/D\u003c\/td\u003e\n\u003ctd\u003eControlLogix ControlNet Interface Module, Redundant-Media, Series D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eTechnical 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\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCatalog Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1756-CNBR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eControlNet Interface Module (Redundant-Media)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSeries D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiagnostic Display\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-character scrolling display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Counters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16-bit minor fault counters (Bandwidth, Network Error, ControlBus Receive Error, ControlBus Address Error)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnconnected Buffers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 20 client buffers and 20 server buffers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRack Optimization Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaximum 5 controllers per remote adapter module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure the ControlNet network cable is properly terminated at all ends to avoid communication faults and module assertion errors.\u003c\/li\u003e\n\u003cli\u003eDo not set the module node address switches to 00 in any system, or to 99 in a redundant system.\u003c\/li\u003e\n\u003cli\u003eLimit rack optimization configurations to a maximum of five controllers per remote adapter to prevent connection resource errors (16#011a).\u003c\/li\u003e\n\u003cli\u003eVerify proper seating of the module into the ControlLogix chassis backplane slot.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eControlNet International (CI) Conformance Tested\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695185097067,"sku":"1756-CNBR","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1756-cnbr-controllogix-communication-module-shxolzts41h_514183e9-4624-4190-9a02-8f4633086fbe.jpg?v=1766114426","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1756-cnbr-controllogix-controlnet-interface-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}