Allen Bradley 1756-EN2T EtherNet/IP Communication Module

Introduction

The Allen Bradley 1756-EN2T is a dual-port EtherNet/IP communication module designed for the ControlLogix family. It provides reliable, high-speed network connectivity between controllers, HMIs, drives, and other industrial devices. With support for 64 simultaneous connections, deterministic I/O messaging, and dual RJ45 ports, this module is ideal for complex automation systems that require redundant communication paths, fast data exchange, and robust diagnostics.

Technical Specifications

Applications

The 1756-EN2T module is used in industrial and manufacturing systems requiring reliable Ethernet connectivity:

• Factory Automation – Connects ControlLogix controllers with HMIs, drives, and sensors.

• Process Control – High-speed, deterministic communication for chemical, food, or pharmaceutical processes.

• SCADA Systems – Integration with remote monitoring and data acquisition.

• Distributed Control Networks – Supports multiple chassis and I/O modules over Ethernet/IP.

• Motion Control Systems – Real-time coordination of drives and servo devices.

• Enterprise Integration – Facilitates connection between plant floor and corporate networks.

Advantages

• Dual-Port Flexibility: Supports daisy-chain, ring, or redundant network configurations.

• High-Speed Communication: 10/100 Mbps ports with 1 ms update rates ensure deterministic control.

• Large Connection Capacity: Up to 64 simultaneous connections for complex automation networks.

• Comprehensive Diagnostics: LED indicators and software tools simplify troubleshooting.

• Seamless ControlLogix Integration: Compatible with all standard ControlLogix CPUs and I/O modules.

• Industrial Reliability: Designed for harsh environments with shock, vibration, and temperature tolerance.

• Scalable Architecture: Easily expands to multiple modules for large networked systems.

• Enterprise Connectivity: Supports TCP/IP, UDP, DHCP, DNS, and SNMP for broad integration

Frequently Asked Questions (Technical FAQs)

1. Q: Can the EN2T module be used with older ControlLogix CPUs?
   A: Yes, it supports all standard ControlLogix processors with compatible firmware.

2. Q: How many simultaneous connections can the module handle?
   A: Up to 64 connections for EtherNet/IP messaging.

3. Q: Can it support ring network topology for redundancy?
   A: Yes, the dual RJ45 ports allow ring or daisy-chain configurations.

4. Q: Is it possible to connect directly to an enterprise LAN?
   A: Yes, it supports standard TCP/IP and EtherNet/IP protocols.

5. Q: What is the typical I/O update rate?
   A: Approximately 1 ms per update cycle under normal load.

6. Q: Are the two Ethernet ports independent?
   A: Yes, both can operate independently or in a ring configuration.

7. Q: How can I monitor the module’s network status?
   A: Through LEDs on the module and Studio 5000 diagnostics.

8. Q: Can multiple EN2T modules be installed in the same chassis?
   A: Yes, provided each occupies a free slot and network design supports it.

9. Q: Does the module support DHCP for IP addressing?
   A: Yes, it can obtain IP addresses via DHCP.

10. Q: Can it withstand high-vibration environments?
    A: Yes, it is rated for industrial shock and vibration compliance.

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