Description

The 1756-EN2TR Allen-Bradley CLX ENet/IP 100M DLR Module is a ControlLogix EtherNet/IP communication module designed to provide network connectivity for ControlLogix chassis-based automation systems.

Unlike standard I/O modules that interface directly with field devices, the 1756-EN2TR operates as a communication bridge within the control architecture. It connects ControlLogix platforms with EtherNet/IP networks, allowing controllers, remote I/O racks, operator interfaces, drives, and other industrial devices to exchange data through an Ethernet-based infrastructure.

With dual Ethernet ports and Device Level Ring (DLR) capability, the module is commonly used in industrial systems where network availability and flexible topology are important considerations. It remains a frequently requested ControlLogix spare part for maintaining existing automation networks and replacing installed communication modules.

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Technical Specifications

Parameter	Specification
Brand	Allen-Bradley
Product Family	ControlLogix
Model	1756-EN2TR
Product Type	EtherNet/IP Communication Module
Communication Network	EtherNet/IP
Network Interface	Dual Copper Ethernet Ports
Ethernet Port Type	RJ45
Communication Speed	10/100 Mbps
Number of Ethernet Ports	2
Network Topology Support	Device Level Ring (DLR)
Mounting Type	ControlLogix Chassis
Slot Width	Single Slot
TCP Connections	Up to 128
CIP Connections	Up to 256
Backplane Current Draw	1 A @ 5.1V DC
24V DC Current Draw	3 mA
Power Dissipation	5.1 W
Thermal Dissipation	17.4 BTU/hr
Cable Compatibility	Category 5 Ethernet Cable
Enclosure Type	Open Style
Communication Protocol	TCP/IP, EtherNet/IP

Network Function Within ControlLogix Systems

The 1756-EN2TR serves as the Ethernet communication interface between the ControlLogix backplane and external industrial networks.

A typical communication path may include:

System Layer	Function
ControlLogix Controller	Executes control application
1756-EN2TR	Provides EtherNet/IP network access
Industrial Ethernet Network	Transfers data between devices
Remote Devices	Exchange control and status information

The module allows a ControlLogix chassis to communicate with distributed automation equipment without replacing the existing controller platform.

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Dual-Port Ethernet & DLR Capability

One of the key features of the 1756-EN2TR is its dual-port Ethernet design.

Compared with single-port communication modules, the dual-port configuration supports network layouts where devices are connected in a ring arrangement.

Feature	Benefit
Two Ethernet Ports	Flexible network connection options
DLR Support	Enables ring-based Ethernet architectures
10/100 Mbps Communication	Supports standard industrial Ethernet infrastructure
ControlLogix Integration	Direct chassis-based installation

This design makes the module suitable for automation systems requiring communication continuity and structured Ethernet networking.

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Common Industrial Applications

The 1756-EN2TR is commonly found in ControlLogix installations requiring Ethernet-based communication between automation components.

Typical applications include:

Remote I/O communication
ControlLogix network expansion
HMI communication
Industrial drive connectivity
Factory Ethernet infrastructure
Machine automation networks

For existing facilities, this module is often purchased as a direct hardware replacement when an installed communication path needs restoration.

Comparison Within ControlLogix Communication Modules

Model	Communication Feature
1756-ENBT	EtherNet/IP communication
1756-EN2T	EtherNet/IP with single Ethernet port
1756-EN2TR	EtherNet/IP with dual ports and DLR support
1756-EN3TR	Higher performance EtherNet/IP communication

The 1756-EN2TR is positioned for applications requiring dual Ethernet connectivity within the ControlLogix platform.

FAQ

Q1: What is the main function of the 1756-EN2TR module?

It provides EtherNet/IP communication for ControlLogix systems, enabling industrial network data exchange.

Q2: What does DLR support mean in this module?

DLR allows ring-based network redundancy to improve communication reliability in industrial Ethernet systems.

Q3: Which platform uses the 1756-EN2TR?

It is used in the Allen-Bradley ControlLogix PLC & Controllers architecture.

Q4: What communication speed does it support?

It supports 100 Mbps industrial Ethernet communication.

Q5: Where is this module typically applied?

It is used in factory automation, distributed control systems, and industrial networking environments.

Why Choose Us?

Stable supply of Allen-Bradley ControlLogix I/O Modules & Communication components for industrial automation

Reliable sourcing of 1756-EN2TR EtherNet/IP communication modules for PLC networking systems

Accurate part-number matching for industrial Ethernet communication module procurement

Fast fulfillment for PLC & Controllers network expansion hardware

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