Configured for EtherNet/IP bridge communication in ControlLogix automation systems, the Allen-Bradley 1756-EN3TR (1756-EN3TR EtherNet/IP Module) provides direct physical and network data execution between ControlLogix backplane resources and Ethernet devices.

Model Configuration Overview

The 1756-EN3TR is a ControlLogix EtherNet/IP interface module with an embedded copper Ethernet switch function. The module supports distributed control communication, network bridging, and motion applications requiring synchronization with ControlLogix controllers.

Hardware Specifications

EtherNet/IP Network Architecture

The 1756-EN3TR operates as an EtherNet/IP communication interface within the ControlLogix chassis. Its embedded switch capability allows network device connections without requiring an external Ethernet switch for specific topologies.

The module supports deterministic EtherNet/IP communication structures used for controller-to-controller messaging, I/O communication, and motion control applications. Network configuration parameters are managed through Rockwell Automation programming environments.

The ControlLogix backplane interface provides data exchange between the communication module and installed Logix controllers or I/O modules. The module's firmware compatibility determines supported communication features and network services.

Ordering Information

The supplied configuration includes:

• 1 x Allen-Bradley 1756-EN3TR ControlLogix EtherNet/IP Module
• 1 x Installed ControlLogix chassis mounting interface
• 1 x Factory hardware identification label

Additional components required for operation:

• ControlLogix chassis with compatible power supply
• EtherNet/IP network cabling
• ControlLogix programming software for configuration

Field Installation Guidelines

Chassis Mounting

• Install the module into a compatible ControlLogix chassis slot.
• Confirm chassis power is removed before module insertion or removal.
• Verify module seating and locking mechanism engagement.

Network Connection

• Use industrial Ethernet cabling suitable for the installation environment.
• Separate Ethernet communication wiring from high-voltage power conductors.
• Maintain proper grounding and shield termination practices according to site standards.

Power and Backplane Check

• Confirm backplane power capacity before adding modules to the chassis.
• Verify 5 VDC and 24 VDC backplane current loading.
• Check module status indicators after power application.

Frequently Asked Questions

• What communication protocol does the 1756-EN3TR support?

  The module supports EtherNet/IP communication for ControlLogix systems, including network bridging and controller communication functions.

• Does the 1756-EN3TR include an Ethernet switch?

  Yes. The module contains an embedded copper Ethernet switch function for supported network configurations.

• What is the backplane current requirement?

  The module requires 1 A at 5 VDC and 3 mA at 24 VDC from the ControlLogix backplane.

• Can the module support motion applications?

  Yes. The module supports applications requiring communication with up to 128 axes of motion.

• Is the 1756-EN3TR hot-swappable?

  Module insertion and removal procedures must follow ControlLogix chassis installation requirements and approved operating conditions.

• What programming software is used for configuration?

  Configuration is performed through Rockwell Automation programming tools compatible with ControlLogix EtherNet/IP modules.

• What Ethernet cable type is required?

  The module uses copper Ethernet connections. Cable selection depends on network design and installation conditions.

• Does the module require external power wiring?

  No. The module receives operating power through the ControlLogix chassis backplane connection.