Allen-Bradley 1756-CNB ControlNet Communication Bridge Module

Allen-Bradley 1756-CNB ControlNet Communication Bridge Module is a non-redundant bridge that connects a ControlLogix chassis to a ControlNet network, enabling high-speed data exchange between the Logix controller and remote I/O devices. It resides in a 1756 backplane and serves as the gateway for ControlNet traffic between the ControlLogix backplane and the ControlNet network, supporting 40 to 48 ControlNet connections per module. The A01 revision is reflected in the product identifiers for this specific unit. Typical applications include linking ControlNet I/O racks to a ControlLogix controller for centralized process control, data collection, and deterministic I/O communication across distributed automation sites. Compatible with ControlLogix systems and 1756-series chassis, the 1756-CNB provides a bridge interface to ControlNet without built-in redundancy (unlike the CNBR variant).