Allen-Bradley 1756-CNB ControlNet Communications Bridge PLC Module

Allen-Bradley 1756-CNB ControlNet Bridge Module is a ControlLogix-compatible interface that links a ControlLogix backplane to a ControlNet network, enabling data exchange and device messaging between the controller and remote I/O over ControlNet. The module supports 40–48 ControlNet connections, enabling a sizable ControlNet topology to be serviced from a single ControlLogix chassis. It bridges unscheduled data, including messaging and programming information, between the ControlLogix backplane and the ControlNet network, helping to segregate control traffic and extend distributed I/O to ControlNet devices. Designed for industrial automation environments that require integrating ControlNet networks with ControlLogix controllers, the 1756-CNB plugs into a 1756 ControlLogix backplane and communicates with ControlNet-equipped devices across the network to coordinate I/O, device messaging, and networked control. As part of the 1756 ControlLogix module family, this bridge provides a centralized gateway for ControlNet connectivity, enabling scalable deployment in facilities that rely on ControlNet for distributed I/O while maintaining a single, controller-centric management plane.