Key features of the 1756-EN4TR module include:

Ethernet Connectivity: The module supports Ethernet/IP protocol, allowing it to communicate with other Ethernet/IP devices in a ControlLogix system.

Four Ethernet Ports: The module has four Ethernet ports, providing flexibility in network configuration. These ports can be used for various purposes like connecting to distributed I/O modules, programming devices, and other network devices.

Redundancy: The 1756-EN4TR module supports redundant network configurations for increased reliability. It can be used in redundant ControlLogix systems to provide fault tolerance and network resiliency.

Diagnostic LEDs: The module has diagnostic LEDs that provide status and fault information, aiding in troubleshooting and maintenance.

Configuration and Monitoring: Configuration and monitoring of the 1756-EN4TR module can be done using Rockwell Automation's Studio 5000 Logix Designer software. It allows you to set up network parameters, monitor network traffic, and manage module functionality.

Compatibility: The 1756-EN4TR module is compatible with other modules in the ControlLogix family, allowing for expansion and integration within a ControlLogix-based automation system.