{"product_id":"ab-1756-cnb-series-e-coaxial-controlnet-plc-module-brand-new","title":"AB 1756-CNB Series E Coaxial ControlNet PLC Module Brand New","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1756-CNB (specifically the current Series E revision, 1756-CNB\/E) operates as a high-velocity communication bridge within the ControlLogix 1756 chassis ecosystem. This module links your central Logix processor to a dedicated 5 Mbps ControlNet network via robust 75-ohm coaxial cabling. By handling both scheduled, deterministic I\/O traffic and unscheduled peer-to-peer messaging, this card establishes predictable, time-critical control links across sprawling manufacturing networks.\u003c\/p\u003e\n\u003cp\u003eWe deliver this product as a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New, original factory-sealed unit in its native factory packing\u003c\/strong\u003e. Each module includes an authentic 12-month factory-backed warranty, ensuring pristine component status, zero runtime hours, and clean BNC interface ports for immediate installation.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Data\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\u003eManufacturer\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\u003eProduct Line\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eControlLogix 1756\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1756-CNB (Series E \/ 1756-CNB\/E)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100% Brand New Original Factory Sealed\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eControlNet Coaxial Communication Bridge\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eData Rate Speed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5 Megabits per second (5 Mbps)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePhysical Interface\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDual BNC connectors for trunk and tap links\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCompatible Cabling\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e75-ohm RG-6 quad-shield coaxial cable\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMaximum Network Nodes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 99 nodes per physical network segment\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current Draw\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e400 milliamps at 5.1 Volts DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Dissipation Matrix\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.14 Watts maximum\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eThermal Dissipation Profile\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e17.5 BTU per hour\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNetwork Isolation Protection\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eChannel-to-backplane physical isolation barriers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChassis Slot Requirement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOccupies exactly 1 standard 1756 chassis slot\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChassis Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFits all standard ControlLogix 1756 chassis variants\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProcessor Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSupports all ControlLogix lines (1756-L6x, -L7x, -L8x)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMedia Redundancy Options\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSupports redundant paths via 1786-TPYR or TPSC taps\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temperature Matrix\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePhysical Unit Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.260 Kilograms (0.57 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRegulatory Certifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUL, CE, CSA, Class I Division 2 Hazardous Locations\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePart Number Breakdown\u003c\/h3\u003e\n\u003cp\u003eWhile the base model remains the 1756-CNB, the letter suffix denotes manufacturing lifecycle enhancements and component revisions.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1756-CNB:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBase model identifier for the ControlLogix ControlNet Coaxial Bridge.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSuffix \/E:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesignates Series E hardware. This specific hardware layer includes updated internal microprocessors, optimized thermal profiles, and enhanced backplane transmission bandwidth compared to obsolete Series A, B, C, or D modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEnforce Deterministic System Response:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIndustrial networks often suffer from unpredictable data packet collisions. The 1756-CNB eliminates this variance by strictly managing Network Update Time (NUT) parameters, locking in guaranteed I\/O refresh cycles for time-critical motion control and precise valve positioning.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEstablish True Media Redundancy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe dual-BNC architecture interfaces seamlessly with 1786-TPYR or 1786-TPSC Y-taps. By deploying two parallel coaxial trunk lines, the system maintains uninterrupted data routing even if a stray forklift or mechanical vibration severs one physical cable path.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDefeat Extreme Electromagnetic Interference:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHeavy variable frequency drives (VFDs) and high-voltage motor starters emit massive electromagnetic noise. The 1756-CNB utilizes heavy-duty quad-shield RG-6 coaxial connections combined with channel-to-backplane electrical isolation to shield network integrity from harsh ambient factory floor interference.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplify Universal Chassis Placement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis bridge contains independent power management hardware, allowing engineers to slide the module into any available slot within a standard 1756 chassis. It shares data smoothly across the multi-master backplane without choking adjacent processor or I\/O modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace an older Series D 1756-CNB module with this new Series E version?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 1756-CNB\/E provides complete backward compatibility. It directly replaces previous Series A, B, C, and D variants inside existing ControlLogix architectures. You simply configure the matching slot location in your RSLogix 5000 or Studio 5000 hardware tree to resume operations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support fiber-optic ControlNet networks directly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 1756-CNB features physical BNC connectors designed for 75-ohm quad-shield coaxial networks. If your plant routing requires fiber-optic segments to span long physical distances, you must connect the coaxial output of this card into an external 1786-RPFM fiber-optic repeater module.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between scheduled and unscheduled messaging on this card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eScheduled messaging reserves a precise slice of network bandwidth exclusively for interlocking data and real-time I\/O status, guaranteeing execution times. Unscheduled messaging utilizes the remaining leftover bandwidth to execute non-critical tasks, such as uploading controller programs, altering recipes, or adjusting HMI parameters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43392127926362,"sku":"1756-CNB","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/90.1_23583824-727f-488d-9adb-8ff76a879736.jpg?v=1779156452","url":"https:\/\/www.spareoil.com\/products\/ab-1756-cnb-series-e-coaxial-controlnet-plc-module-brand-new","provider":"SpareOil Automation","version":"1.0","type":"link"}