Allen-Bradley 1756-CN2 Communication Bridge Module

The Allen-Bradley 1756-CN2 is a Series C ControlNet Bridge Module for ControlLogix systems that links two ControlNet networks and routes messages to remote I/O across racks, enabling cross‑network communications in larger automation architectures. It operates at 5 Mbps and supports up to 99 nodes with as many as 131 active connections, making it suitable for bridging multiple ControlNet networks in complex installations. Power is provided from the backplane at 5.1 V dc with typically 1.1 A draw (5.6 W total dissipation); the module fits a single slot in a 1756 chassis and weighs about 0.57 lb. This Rev. E01 kit ships with a ControlNet bridge cable and is catalogued as 1756-CN2 (Series C), with documentation noting its bridge role and network capacity for ControlLogix controllers. Applications include linking local and remote ControlNet I/O racks, enabling centralized control over distributed devices in manufacturing, packaging, or material handling environments.