Allen-Bradley 1756-CNB ControlLogix IO Module

The Allen-Bradley 1756-CNB ControlNet Bridge Module is a ControlLogix I/O interface that bridges a ControlNet network to a ControlLogix chassis, enabling remote I/O connectivity between distributed racks and the central controller. Designed for installation in a 1756 backplane, it supports 40–48 ControlNet I/O connections, enabling mapping of a sizable set of remote I/O points to a single Logix controller. The module handles both scheduled and unscheduled data traffic, acting as a bridge that relays I/O data and related network configuration information between ControlNet devices and the ControlLogix backplane. Typical applications include expanding remote I/O across large manufacturing cells or plants, where ControlNet networks connect distributed I/O racks to a central ControlLogix CPU for automation and process control.