Allen-Bradley 1756-CN2 ControlNet Interface Module

The Allen‑Bradley 1756‑CN2 ControlNet Interface Module is a single‑channel ControlNet interface for Rockwell Automation’s ControlLogix systems that connects a ControlLogix backplane to a 5 Mbps ControlNet network and supports up to 100 network connections. Installed in a 1756 ControlLogix chassis, it provides the ControlNet media interface used to exchange I/O data and control information with ControlNet devices such as remote I/O blocks and other field equipment. As part of the ControlLogix ecosystem, the CN2 integrates with Rockwell configuration tools and supports standard ControlNet communication patterns for timely I/O updates and messaging across the network, drawing power from the backplane and occupying a single chassis slot. The CN2 family includes variants for higher availability and environmental requirements, including the 1756‑CN2R (redundant media) and 1756‑CN2RK (conformally coated) options, enabling installers to tailor the device to harsh environments or mission‑critical applications. Typical applications involve linking a ControlLogix controller with ControlNet devices across a plant floor—enabling deterministic data exchange for remote I/O, drives, sensors, and other ControlNet devices within batch, process, or discrete manufacturing environments.