The Allen-Bradley 1756-CNBR is a ControlNet Redundant Bridge Module for ControlLogix systems, providing a dedicated bridge between ControlNet networks and the ControlLogix backplane to support high-availability I/O communications. It supports 40–48 ControlNet device connections, enabling dense network topology within a single bridge module. Used in ControlLogix installations to link ControlNet devices through a redundant bridge, it complements the 1756-CNB family and installs in a standard 1756 chassis to extend ControlNet connectivity to Rockwell Automation controllers.
