Allen-Bradley 1756-EN2TRK EtherNet/IP Communication Module

1. Product Overview

The Allen-Bradley 1756-EN2TRK is associated with the ControlLogix family of industrial automation products. The model designation appears to refer to an EtherNet/IP communication module in a conformal-coated configuration, intended for use in industrial control systems where reliable communication between controllers, distributed I/O, operator interfaces, drives, and other networked devices is important.

A key point when specifying this product is to confirm the complete catalog number on the nameplate. The suffix “K” is commonly associated with conformal coating on certain ControlLogix products, while “T” in the EN2T family identifies a copper Ethernet interface. The exact catalog number and hardware revision should be checked before purchasing or designing a replacement, since a small difference in the model suffix can indicate a different configuration.

The module’s principal role is to connect a ControlLogix controller to an EtherNet/IP network. It supports the exchange of control data and diagnostic information between compatible automation devices, helping a control system operate as a coordinated whole.

2. Product Specifications

The table below summarizes the key identification and engineering information. Because the exact 1756-EN2TRK catalog designation needs confirmation, dimensions, weight, and certain hardware-specific details are not presented as verified values. These should be confirmed against the physical label or the applicable product documentation before they are used for cabinet design, procurement, or installation.

Important specification note: Do not use dimensions or weight from a similar module as if they were confirmed values for 1756-EN2TRK. If the catalog number is actually 1756-EN2TK or 1756-EN2TR, the hardware configuration may differ. Confirming the exact label will help prevent incorrect ordering or installation assumptions.

3. Product Introduction

The 1756-EN2TRK is a dual-port EtherNet/IP communication module in the ControlLogix product family. Its main purpose is to provide an Ethernet communication path between a ControlLogix control system and other compatible devices on an industrial network.

The module has two copper RJ45 Ethernet ports supporting 10/100 Mbps communication over twisted-pair Ethernet cabling. Its dual-port design supports network arrangements that can simplify connections between devices and, where configured appropriately, support Device Level Ring (DLR) network topologies.

The model also features conformal coating. This protective coating is intended to improve resistance to certain environmental contaminants that may affect electronic assemblies in industrial settings. It does not make the module waterproof or suitable for unrestricted outdoor use, so the installation environment must still meet the module’s specified limits.

As a chassis-based communication module, the 1756-EN2TRK is installed in a compatible ControlLogix chassis. It works as part of a larger automation system rather than as a standalone Ethernet switch or independent controller. Its capabilities depend on the controller, firmware, network configuration, and connected devices used in the application.

4. Main Technical Characteristics

The physical dimensions and weight above are approximate reference values for the module. Check the exact unit and its revision before using them for a mechanical drawing, shipping calculation, or cabinet-fit assessment.

5. Product Applications

5.1 Factory automation

The 1756-EN2TRK can be used in factory automation systems where a ControlLogix controller exchanges data with remote equipment and other networked devices.

For example, a production line may use the module to connect the main control system with remote I/O, operator stations, variable-frequency drives, and other EtherNet/IP-compatible devices. The controller can then coordinate equipment operation, receive status information, and respond to changes in the production process.

5.2 Packaging and material handling

Packaging machinery often includes multiple coordinated sections, such as product feeding, filling, sealing, labeling, inspection, and discharge. These sections may require frequent communication with the main controller.

The module can provide the Ethernet communication interface for compatible devices in such systems. Networked control makes it easier to exchange operating states, alarms, production counts, and equipment status, helping the overall line operate in a coordinated manner.

5.3 Automotive and assembly systems

Automotive and general assembly lines may contain conveyors, robotic work cells, fixtures, sensors, drives, and distributed control panels.

In a compatible ControlLogix architecture, the 1756-EN2TRK can support communication between the controller and networked equipment. Its conformal coating may be useful where the specified industrial environment presents a greater risk from airborne contaminants, provided the application remains within the product’s environmental ratings.

5.4 Process monitoring and control

Process applications often need continuous exchange of information between controllers, remote I/O, operator interfaces, and monitoring systems.

The module can serve as an Ethernet communication interface for compatible devices, allowing the control system to collect operating states and exchange commands or data. Typical applications include utilities, water treatment, material processing, and industrial production systems.

Suitability depends on the complete system design, including network performance, required availability, device compatibility, and the environmental conditions at the installation site.

5.5 Distributed I/O systems

A large machine or production facility may use remote I/O to reduce long runs of individual signal wiring back to the main control cabinet.

The 1756-EN2TRK can connect the ControlLogix network to compatible remote I/O and other EtherNet/IP devices. This arrangement can make a system easier to organize, expand, and troubleshoot, provided the network is designed within the applicable connection and performance limits.

5.6 Industrial equipment requiring additional environmental protection

The conformal-coated configuration is an important distinction from otherwise similar modules. Industrial cabinets can be exposed to airborne contaminants that may gradually affect unprotected electronic assemblies.

The coating adds a level of protection to the circuit assembly, but it should not be treated as a substitute for appropriate cabinet design, temperature control, grounding, or environmental assessment.

6. Product Advantages

6.1 Dual-port Ethernet connectivity

The module provides two copper Ethernet ports, giving system designers flexibility when connecting compatible equipment. Depending on the network design, dual-port connectivity can help simplify device interconnection and support a suitable ring topology.

The actual benefits depend on correct configuration and the capabilities of the devices connected to the network.

6.2 Integration with ControlLogix systems

Because the module belongs to the ControlLogix family, it is intended to operate within a compatible chassis-based control architecture.

This can simplify integration where a project already uses compatible controllers, I/O modules, and engineering tools. It also allows the communication module to become part of the wider control-system design instead of requiring a separate, independent controller for its communication function.

6.3 Conformal-coated construction

The conformal coating is one of the most notable features of the 1756-EN2TRK. It is intended to improve protection against certain environmental contaminants that can affect electronic assemblies.

This can be valuable in industrial environments where environmental exposure is a design concern. The coating does not remove the need to comply with the published temperature, humidity, vibration, and installation requirements.

6.4 Support for common industrial Ethernet infrastructure

The module uses copper RJ45 Ethernet interfaces and supports 10/100 Mbps communication. This can make it suitable for many conventional industrial Ethernet installations using compatible cabling and network equipment.

Cable quality, network loading, electrical noise, topology, and correct installation practices still affect communication reliability.

6.5 Support for distributed system architectures

The module can form part of a system that connects a central controller with equipment distributed around a facility. This approach can reduce the need to bring every device connection directly back to a single cabinet.

A well-designed distributed architecture can also make it easier to identify network segments, organize devices, and plan future modifications.

6.6 Useful for maintenance and troubleshooting

EtherNet/IP communication allows compatible equipment to exchange operating information and diagnostic data. When the network and connected devices are configured correctly, maintenance personnel can use that information to investigate communication faults, device status, and production interruptions.

The module itself does not guarantee uninterrupted operation. Network redundancy, controller behavior, device configuration, and maintenance practices all influence system availability.

7. Brand and Product Series

The ControlLogix family is designed for industrial control applications that need a modular architecture. A typical system can combine a controller, chassis, power supply, communication modules, digital and analog I/O, and other compatible modules.

Within that architecture, the 1756-EN2TRK is specifically a communication component. It should not be confused with a processor module, power supply, or standalone Ethernet switch.

8. Five Related Models

The following models are related by their ControlLogix communication role or by their use in a compatible ControlLogix system. They are not all direct, drop-in replacements for the 1756-EN2TRK. Check port count, data rate, conformal coating, firmware compatibility, and required network features before selecting an alternative.

Dimensions and weights in this comparison are indicative module-family values, not guaranteed mechanical specifications for every listed model. For a replacement order, confirm the full catalog number and series.

How to choose among these related models

• 1756-EN2TR: Worth considering when dual-port Ethernet connectivity is required but the conformal-coated version is not specifically needed.

• 1756-EN2T: Worth considering for applications that need a compatible EtherNet/IP interface and do not require the same dual-port arrangement.

• 1756-EN3TR: May suit applications that need a different communication capability within the same product family. Confirm the exact feature set before replacing an existing module.

• 1756-EN4TR: Consider when designing or upgrading a system that needs the capabilities of this newer communication-module family. Verify compatibility with the installed controller and network.

• 1756-EN2TK: Particularly relevant when conformal coating is a requirement, but the exact suffix and port configuration must match the intended design.

9. Five Popular Models from the Same Brand

The following products are commonly encountered in ControlLogix system designs. They cover different roles, so they complement the 1756-EN2TRK rather than all serving as direct substitutes.

The dimensions and weights shown for these related products are planning estimates where indicated. They should not be used as final procurement or mechanical-design data without checking the exact hardware revision.

How these products work with the 1756-EN2TRK

• 1756-L83E: Provides the processing and control functions, while the communication module supplies its own network interface role within the system.

• 1756-PA75: Supplies power to a compatible chassis. The selected power supply must meet the combined load requirements of the installed modules.

• 1756-IB16: Receives digital signals from compatible field devices, such as switches and sensors.

• 1756-OB16E: Sends digital output signals to compatible field devices, subject to the module’s output ratings and load requirements.

• 1756-A13: Provides the physical chassis and backplane for compatible ControlLogix modules.

These components illustrate how a complete automation system can combine processing, communication, power distribution, input acquisition, and output control. They should be selected as a coordinated system rather than as isolated parts.

10. Installation and Configuration Considerations

10.1 Confirm the catalog number

Before installation or replacement, verify that the module label reads 1756-EN2TRK. Similar catalog numbers may have different environmental coatings, port arrangements, performance characteristics, or compatibility requirements.

10.2 Check chassis compatibility

The module is intended for a compatible ControlLogix chassis. Confirm that the chassis, power supply, controller, and installed firmware support the intended configuration.

10.3 Plan the Ethernet network

Determine the required network topology, IP addressing, cable routes, connected devices, and communication load. If a ring topology is planned, ensure that the devices and network configuration support the intended ring operation.

10.4 Review environmental conditions

Although the conformal coating provides additional protection against certain contaminants, it does not make the module suitable for every harsh environment. Cabinet temperature, humidity, condensation risk, vibration, and other environmental factors must remain within the applicable limits.

10.5 Verify physical dimensions and weight

The approximate module dimensions are useful for preliminary planning, but final cabinet drawings should use the correct mechanical drawing for the exact model and revision. Shipping weight may also differ from the module’s net weight because of packaging and accessories.

11. Summary

The Allen-Bradley 1756-EN2TRK is a conformal-coated, dual-port EtherNet/IP communication module associated with the ControlLogix family. Its key characteristics include two copper RJ45 ports, 10/100 Mbps Ethernet communication, support for up to 128 TCP connections, and a chassis-based installation design.

Its principal advantages are dual-port network connectivity, integration with compatible ControlLogix systems, and the added environmental protection associated with conformal coating. Typical uses include factory automation, distributed I/O, packaging lines, assembly equipment, and process-control systems.

When choosing this model or a related product, the most important factors are the exact catalog number, port arrangement, network requirements, controller and firmware compatibility, environmental conditions, and mechanical fit. The related models listed above can help with system planning, but they should not be treated as interchangeable without checking their technical specifications.

For purchasing or engineering documentation, confirm the exact dimensions and weight from the unit’s mechanical specification rather than relying solely on approximate figures.