Description

The 1756-EN3TR is a ControlLogix EtherNet/IP communication module from Allen-Bradley (Rockwell Automation), distinguished from the standard 1756-EN2TR by its extended integrated motion capability. While it performs the same core functions as the EN2TR for I/O and messaging, the 1756-EN3TR supports up to 128 motion axes over EtherNet/IP, making it the choice for ControlLogix applications where servo drives and coordinated motion share the same network as standard I/O . The module features dual copper RJ45 ports with an embedded switch, enabling device-level ring (DLR) topologies without external switches.

Application Scenarios

A machine builder designing a multi-axis packaging line uses a ControlLogix chassis as the line controller. The line includes twelve Kinetix servo axes for forming, sealing, and cutting stations, plus remote I/O drops for pneumatic valves and sensors. Rather than adding a separate motion network module alongside a standard Ethernet bridge, the builder installs a 1756-EN3TR in the ControlLogix rack. The module’s dual ports connect into a DLR ring that includes the servo drives and remote I/O, providing media redundancy so a single cable break does not halt production. The 1756-EN3TR handles both the implicit CIP Motion traffic for the twelve axes and the standard EtherNet/IP I/O and messaging traffic, simplifying the network architecture and reducing the number of modules, cables, and managed switches required in the panel.

Parameter