{"product_id":"allen-bradley-1756-cn2r-b-controlnet-communication-module","title":"Allen-Bradley 1756-CN2R\/B ControlNet Redundant Communication Module","description":"\u003cp\u003eThe Allen-Bradley 1756-CN2R\/B is a Series B ControlNet communication bridge module engineered for the ControlLogix platform. This module facilitates deterministic, high-speed data exchange between controllers, remote I\/O, and field devices. By utilizing a dual-channel coaxial architecture, the 1756-CN2R\/B provides critical redundancy, ensuring continuous network operation even in the event of a single-cable failure or signal degradation.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedundant Media Support:\u003c\/strong\u003e Dual BNC connectors allow for redundant ControlNet cabling, enabling automatic failover if a primary link is compromised.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeterministic Throughput:\u003c\/strong\u003e Maintains a constant 5 Mbps data rate, essential for time-critical control applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Capacity:\u003c\/strong\u003e Supports up to 99 nodes on a single network and manages up to 131 total connections (128 of which are dedicated to Logix controllers).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated USB Port:\u003c\/strong\u003e Includes a dedicated USB port for local configuration and diagnostic access.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries B Reliability:\u003c\/strong\u003e Optimized hardware design for improved stability and performance in demanding industrial environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eESD Protection:\u003c\/strong\u003e Always utilize an ESD wrist strap or similar grounding device when handling the module to prevent damage to sensitive internal components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Insertion:\u003c\/strong\u003e Ensure the ControlLogix chassis is powered down before inserting or removing the module. Align the module with the chassis guides and seat firmly to ensure proper backplane connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabling:\u003c\/strong\u003e Use only 1786-RG6 quad-shield coaxial cables for network connections to maintain signal integrity and meet specification requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental:\u003c\/strong\u003e Mount the module in an environment that maintains an ambient temperature between 0 and 60 degC. Ensure adequate airflow around the chassis to prevent heat buildup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Ensure the ControlLogix chassis is properly grounded according to local electrical codes to minimize EMI impacts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-CN2R\/B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSeries B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Speed\u003c\/td\u003e\n\u003ctd\u003e5 Mbps\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 (128 Logix)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e6.7 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5.1V)\u003c\/td\u003e\n\u003ctd\u003e1300 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Does this module support non-redundant configurations?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the 1756-CN2R\/B can operate in a single-cable configuration, though it is specifically designed to provide redundant media capability for high-availability systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the primary difference between Series A and Series B?\u003c\/strong\u003e\u003cbr\u003eA: The Series B hardware revision features updated internal processing components for improved reliability and firmware compatibility within the ControlLogix ecosystem.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51214763458812,"sku":"1756-CN2R\/B","price":87.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_116234f8-640c-48b6-a778-d1c4ffdc2aa0.jpg?v=1788279642","url":"https:\/\/www.electronicplc.com\/es\/products\/allen-bradley-1756-cn2r-b-controlnet-communication-module","provider":"Electronic PLC","version":"1.0","type":"link"}