The Allen-Bradley 1756-EN2T is a part of the ControlLogix Communication Module series. It is an EtherNet/IP (Ethernet Industrial Protocol) interface communication module. It supports general messaging, real-time I/O messaging, and information exchange for applications like Real-Time Control, Time Synchronization, and Motion. The 1756-EN2T also has the CIP safety standard by allowing simultaneous transfer of safety and control data and diagnostics information. It uses advanced communication chips and physical media.

The 1756-EN2T supports 10 to 100 Mbps EtherNet/IP communication rates and uses Twisted pair copper media. It supports 256 Logix and 128 TCP/IP communication connections. It can support a maximum of 8 axes for integrated motion on the Ethernet/IP Network and draws 1 A current at 5.1 Volts DC. It has a maximum power dissipation of 5.1 Watts and thermal dissipation of 17.4 BTU/hour. It can be installed in any slot in the ControlLogix Chassis. For wiring, it uses unshielded RJ45, category 5, twisted-pair cable connectors to interface with the controller. To operate an EtherNet/IP network, parameters such as an IP address, Subnet masks, Gateway, etc. must be defined. The 1756-EN2T bridge has various functions like providing support for messaging, distributed I/O, and tags. It encapsulates messages within standard TCP/IP protocol. ControlNet and DeviceNet network protocols allow it to share a common application layer. It does not require any scheduling or routing table to store information. Other features include a protected mode, an electronic keying, a device level ring network, and a parallel redundancy protocol network support.

The 1756-EN2T is a ControlLogix Communication adapter that supports Ethernet I/P protocol. This module is a single slot module which may be installed to any slot of a ControlLogix chassis. It has One (1) RJ45 port that is used to interface with Ethernet network.

Ethernet is a user-friendly and modern protocol that is widely utilized nowadays due to evolution of Industrial Internet of Things (IIoT). Devices with capable of Ethernet protocol are most ready for implanting the emerging technology. Also, Ethernet is an open protocol which means network scalability is far easier to implement as devices are required are not proprietary types.

A single 1756-EN2T module is capable of being simultaneously communicated with a Human Machine Interface (HMI), Supervisory Control and Data Acquisition (SCADA), Programming workstation, Distributed I/O clients, 3rd party devices or any combination these devices. Up to 256 Logix and 128 TCP/IP connections can be accommodated by this module.

This module is capable of being connected to a network with linear topology and it supports 10/100 Mbps communication rate. It is compatible with any ControlLogix Chassis such as 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 and ControlLogix Power supply such as 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75, 1756-PC75, 1756-PH75.