The Allen-Bradley 1756-CNB is a ControlNet Bridge Module for ControlLogix systems that links a ControlNet network to the ControlLogix backplane, enabling data exchange between ControlNet devices and a PLC rack. It operates at 5 Mbps and provides 40-48 Logix Communications Connections, mounting in a 1756 ControlLogix chassis to bridge ControlNet traffic with the backplane for unscheduled data such as messaging. This module is part of Rockwell Automation's ControlNet bridge family and was discontinued on December 31, 2024, with the replacement being the 1756-CN2 in current catalogs.
