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| Specification Details Protocol & Speed ControlNet at 5?Mbps Ports 2 × BNC (Trunk A & B – redundant media); 1 × RJ45 NAP Logical Connections Supports 40–48 scheduled Logix connections; 64 total possible; up to 99 nodes Power Consumption 970?mA @?5.1?V DC; 1.7?mA @?24?V DC Power Dissipation 5.1?W (?17.4?BTU/h) Isolation Voltage 30?V continuous between ControlNet A/B and backplane Certification & Environmental Module supports Class I Div 2 | |
|---|---|
| IEC 60068; operation | 0–60?°C Lifecycle Status Discontinued as of Dec 31 |
| 2024; replaced by 1756?CN2R; supports legacy systems |
The 1756?CNBR is a ControlNet scanner/bridge communication module designed for Allen?Bradley ControlLogix systems. It features dual BNC ports for ControlNet trunk A/B to support redundant media, plus an RJ45 Network Access Port (NAP) for programming. It provides deterministic, high?speed networking at 5?Mbps, supporting up to 99 nodes and bridging between the ControlLogix backplane and ControlNet I/O devices. It’s essential in redundant network setups to ensure communication remains intact when one trunk fails
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