The Allen-Bradley 1756-CNB ControlNet Communications Bridge is a ControlNet bridge module for ControlLogix systems that links a ControlLogix backplane to a ControlNet network, enabling communication between a ControlLogix controller and ControlNet devices. It provides 40–48 ControlNet connections and supports a 5 Mbps ControlNet data rate, facilitating bridging to multiple ControlNet remote I/O nodes. Installed in a 1756 chassis, the CNB serves as the interface between the ControlNet network and the ControlLogix controller, allowing ControlNet devices to exchange messages with the controller.
