Product Introduction and Network Integration

The 1756-EN4TRK is a high-capability communication module for ControlLogix systems. It supports 10/100/1000 Mbps twisted-pair Ethernet connections and provides up to 512 TCP connections and support for up to 256 motion axes. These capabilities make it suitable for automation architectures with substantial communication and motion-control requirements.

In addition to standard EtherNet/IP communication, the module supports CIP Security, helping protect industrial communication through security mechanisms designed for compatible CIP devices and systems. Its dual-port interface supports Device Level Ring (DLR) and linear network topologies, while its conformal coating provides additional protection for the electronics.

The module can be used to connect ControlLogix controllers with compatible remote I/O, drives, motion devices, and supervisory systems. Before installation, engineers should confirm firmware compatibility, network addressing, security settings, and the required communication topology. For applications involving redundant adapters, verify the supported firmware revision and system configuration.

The 1756-EN4TRK is a useful option for expanding Ethernet communication capacity in ControlLogix installations where network performance, security, and environmental protection are important.

Technical Specifications

Parameter	Description
Brand	Allen Bradley
Model	1756-EN4TRK
Product Series	ControlLogix
Product Type	EtherNet/IP Communication Module
Communication Protocol	EtherNet/IP
Ethernet Ports	2
Ethernet Media	Twisted-pair Ethernet
Supported Data Rates	10/100/1000 Mbps
TCP Connections	512
Supported Motion Axes	Up to 256
Network Topologies	Device Level Ring (DLR), Linear
Network Security	CIP Security
Special Feature	Conformal Coating
Mounting	ControlLogix Chassis
Dimensions	144.5 × 34.6 × 130.18 mm
Weight	0.31 kg / 0.68 lb

Recommended Related Models

Model	Product Description
1756-EN4TR	ControlLogix EtherNet/IP Communication Module
1756-EN4TRXT	ControlLogix EtherNet/IP Communication Module, Extended Temperature
1756-EN3TRK	ControlLogix EtherNet/IP Communication Module, Conformally Coated
1756-EN2TRK	ControlLogix EtherNet/IP Communication Module, Conformally Coated
1756-EN2TK	ControlLogix EtherNet/IP Communication Module, Conformally Coated

Popular Related Models

Model	Product Description
1756-L83E	ControlLogix Programmable Automation Controller
1756-L81E	ControlLogix Programmable Automation Controller
1756-A10	ControlLogix 10-Slot Chassis
1756-PA72	ControlLogix AC Power Supply
1756-IB16	ControlLogix 16-Point Digital Input Module
1756-OB16E	ControlLogix 16-Point Digital Output Module
1756-IF8	ControlLogix 8-Point Analog Input Module

Note: The 1756-EN4TRK is a specific conformally coated model with CIP Security capabilities. When selecting a replacement, verify the catalog number, firmware revision, security requirements, and compatibility with the existing ControlLogix system.

Applications

The 1756-EN4TRK can serve as an Ethernet communication interface in a range of industrial automation environments.

Controller Networking: Connects ControlLogix systems to EtherNet/IP networks for data exchange with other automation devices.
Distributed I/O: Supports communication between controllers and compatible remote I/O platforms.
Drive Integration: Enables network communication with compatible EtherNet/IP variable frequency drives and motion-related equipment.
Supervisory Control: Provides a communication path for exchanging control and status information with SCADA and HMI systems.
Production Line Coordination: Helps connect machinery and control systems across manufacturing cells and production lines.
Industrial Network Expansion: Adds EtherNet/IP connectivity when expanding or upgrading an existing ControlLogix architecture.

Advantages and Key Features

EtherNet/IP Connectivity

The module provides an Ethernet communication interface for integrating ControlLogix controllers with compatible industrial network devices.

Dual-Port Network Interface

Its two Ethernet ports support network connection flexibility and can be used in supported network topologies, including device-level ring arrangements.

Conformal Coating

The 1756-EN4TRK is a conformally coated version, offering additional protection for circuit components against environmental contaminants.

ControlLogix Integration

Designed for the ControlLogix platform, the module fits into a compatible chassis and communicates through the system backplane.

Flexible Network Architecture

Support for EtherNet/IP communication makes it suitable for connecting controllers, remote I/O, drives, and supervisory systems within an integrated automation network.

Network Diagnostics

Status indicators and diagnostic information help technicians assess module operation and identify communication issues during commissioning and maintenance.

Technical FAQs

Q1: What is the primary function of the 1756-EN4TRK?

It provides EtherNet/IP communication for a ControlLogix system, allowing the controller to exchange data with compatible devices over an Ethernet network.

Q2: How many Ethernet ports does the module have?

The module provides two Ethernet ports. These allow network connections to be arranged according to the supported network architecture and application requirements.

Q3: Does the 1756-EN4TRK support Device Level Ring (DLR)?

The module supports Device Level Ring functionality, allowing it to participate in supported ring network topologies. Correct configuration of the network devices and ring supervisor is essential.

Q4: What is the difference between the 1756-EN4TRK and 1756-EN4TR?

The 1756-EN4TRK is the conformally coated version of the 1756-EN4TR. Both provide EtherNet/IP communication, but the coating option is an important consideration when selecting a replacement.

Q5: Can the module communicate with remote I/O devices?

Yes. It can support communication with compatible EtherNet/IP remote I/O devices when the controller project, network configuration, and device profiles are correctly configured.

Q6: Is the 1756-EN4TRK installed in a ControlLogix chassis?

Yes. It is a chassis-based ControlLogix module and uses the system backplane for communication with the controller and other installed modules.

Q7: Which software is used to configure the module?

Studio 5000 Logix Designer is commonly used to configure the ControlLogix project and associated communication settings. The required software version depends on the controller and module revision.

Q8: What should be checked if the module cannot establish an Ethernet connection?

Check the Ethernet cable, switch port, link indicators, IP address, subnet configuration, and network topology. Also verify that the controller project uses the correct module profile and communication settings.

Q9: Can the two Ethernet ports be used for separate independent networks?

The ports are part of the module's Ethernet interface and should not automatically be treated as two unrelated network interfaces. Their use depends on the supported operating mode and network design.

Q10: What information should be recorded before replacing a 1756-EN4TRK?

Record the module revision, IP address, network configuration, port connections, controller project settings, and any ring or switch configuration relevant to the installation. This helps restore communication consistently after replacement.

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