The 1756-EN2TR is an Ethernet/IP communication module for the ControlLogix series of programmable logic controllers (PLCs) by Allen-Bradley. It         provides a communication interface for connecting the ControlLogix system to an Ethernet network.

     Here are some key features and specifications of the 1756-EN2TR module:

1. Ethernet/IP Communication: The module supports the Ethernet/IP protocol, which allows for seamless integration with other devices and systems on an Ethernet network.

2. Dual-Port Design: The 1756-EN2TR module features two Ethernet ports, allowing it to be used in different network topologies and facilitating network redundancy and fault tolerance.

3. Communication Rate: It supports data rates of 10/100 Mbps for Ethernet communication.

4. Integrated Switch: The module includes an integrated network switch that simplifies wiring and networking by allowing multiple devices to be connected in a daisy-chain configuration.

5. Diagnostic LEDs: The module has diagnostic LEDs that indicate the status of network communication and aid in troubleshooting.Compatibility: The 1756-EN2TR is compatible with the ControlLogix 5572, 5580, and other compatible controllers.