{"product_id":"allen-bradley-1756-cn2rxt-controllogix-controlnet-interface-module","title":"Allen-Bradley 1756-CN2RXT ControlLogix ControlNet Interface Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-CN2RXT ControlLogix ControlNet Interface Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eConfigured for deterministic ControlNet frame handling in ControlLogix chassis networks, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-CN2RXT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-CN2RXT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eInterface Module) provides direct electrical execution of 5 Mbps ControlNet communication across redundant coaxial media paths within a Logix backplane environment. The module supports up to 99 nodes and manages up to 131 network connections with 128 Logix communication links via chassis-based scheduling.\u003c\/p\u003e\n\u003cp\u003eWithin the\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eRockwell Automation\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eControlLogix architecture, the module executes backplane-to-ControlNet data mapping using dual BNC interfaces and USB service access point for configuration-level communication handling.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eSingle hardware configuration:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-CN2RXT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eControlNet interface module. No additional functional suffix segmentation defined.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\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\u003e1756-CN2RXT\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\u003e0.26 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e6.6 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e5.1 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent\u003c\/td\u003e\n\u003ctd\u003e1.3 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Rate\u003c\/td\u003e\n\u003ctd\u003e5 Mbps ControlNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Nodes\u003c\/td\u003e\n\u003ctd\u003e99\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Connections\u003c\/td\u003e\n\u003ctd\u003e131\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLogix Connections\u003c\/td\u003e\n\u003ctd\u003e128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot Width\u003c\/td\u003e\n\u003ctd\u003e1 communication slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterfaces\u003c\/td\u003e\n\u003ctd\u003e2 ControlNet BNC, 1 USB port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eChassis any-slot module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eDigital status display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eControlNet Dual Media Interface and Backplane Communication Behavior\u003c\/h3\u003e\n\u003cp\u003eThe 1756-CN2RXT performs deterministic ControlNet scheduling at 5 Mbps using redundant coaxial media architecture. Dual BNC connectors provide parallel physical routing paths, while the backplane bus communication layer synchronizes Logix task execution with network transmission cycles.\u003c\/p\u003e\n\u003cp\u003eUSB access point enables configuration-level communication without interrupting ControlNet cyclic traffic. I\/O density scaling is managed through ControlLogix chassis arbitration, allowing up to 128 Logix connections mapped into 131 total network links.\u003c\/p\u003e\n\u003cp\u003eThe module maintains fixed-cycle deterministic transmission timing, where frame propagation is aligned with controller scan execution and scheduled network windows.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 1756-CN2RXT be hot-swapped in an active chassis?\u003c\/strong\u003e\u003cbr\u003eA: Yes. The module supports hot insertion\/removal. Network resynchronization is performed through ControlLogix backplane re-enumeration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What limits the maximum connection count?\u003c\/strong\u003e\u003cbr\u003eA: The limit of 131 connections is constrained by ControlNet scheduling bandwidth and Logix backplane resource allocation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does USB access interrupt ControlNet communication?\u003c\/strong\u003e\u003cbr\u003eA: No. USB service access operates on a separate configuration channel and does not affect 5 Mbps ControlNet cyclic traffic.\u003c\/p\u003e\n\u003chr\u003e\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module into any valid ControlLogix chassis slot ensuring full backplane connector engagement. ControlNet coaxial cables must maintain impedance matching and continuous shielding integrity across BNC connections.\u003c\/p\u003e\n\u003cp\u003eRoute ControlNet media separately from high-current power lines to reduce electromagnetic coupling. Shield termination should be implemented at a single-point ground reference to avoid loop currents across redundant media paths.\u003c\/p\u003e\n\u003cp\u003eVerify firmware compatibility between chassis, controller, and communication module before commissioning to ensure deterministic scheduling alignment across backplane and network layers.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43576283594842,"sku":"1756-CN2RXT","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-CN2RXT2.jpg?v=1782876593","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-cn2rxt-controllogix-controlnet-interface-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}