Allen-Bradley 1756-CNBR ControlNet Bridge Module

The Allen-Bradley 1756-CNBR is a redundant ControlNet bridge module for Rockwell ControlLogix systems that connects a ControlLogix chassis to a ControlNet network while maintaining communications if a single path fails. This model ships with firmware version 11.005 and is designed to sit in a 1756 backplane to act as the gateway between the ControlLogix processor and remote ControlNet devices, enabling reliable data exchange for I/O, motion, and drives across dual network paths. As the redundant counterpart to the non-redundant 1756-CNB, the CNBR module is intended for high-availability network topologies common in critical manufacturing environments. It adheres to ControlNet wiring and signaling conventions and integrates with Rockwell Automation software tooling for configuration and monitoring of ControlNet networks within ControlLogix installations. In practical terms, this bridge module provides continued operation of the controller even if one ControlNet path becomes unavailable, a feature particularly valuable in applications such as packaging lines, conveyors, and other process-control networks where uninterrupted communication is essential.