1. A-B 1756-EN2T | Industrial Ethernet Interface Module

2. Unboxing & Physical Snapshot

• Brand & Model: Allen-Bradley 1756-EN2T
• Manufacturer: Rockwell Automation / Allen-Bradley.
• Product Family: ControlLogix Communication Modules.
• Product Type: EtherNet/IP communication interface module.
• Primary Function: Provides Ethernet communication between ControlLogix chassis devices, HMIs, SCADA systems, remote I/O racks, and other EtherNet/IP devices.
• Network Interface: One copper RJ45 Ethernet port supporting 10/100 Mbps communication.
• Approximate Physical Dimensions (W × H × D): Approximately 38 × 145 × 142 mm.
• Estimated Shipping Weight: Approximately 0.5 kg including protective packaging.
• Mounting Style: Single-slot ControlLogix chassis installation.
• Mechanical Features:
  • Front RJ45 Ethernet connector
  • Status indicator LEDs
  • Removable terminal/label identification area
  • ControlLogix backplane connector
  • DIN-style chassis locking tab
• Cooling Method: Passive convection cooling through cabinet airflow.
• Operating Environment: Industrial control cabinet installation.
• Handling Requirements:
  • Protect the backplane connector pins.
  • Avoid touching exposed electronic contacts.
  • Keep the module inside ESD packaging until installation.
• What’s in the Box:
  • Allen-Bradley 1756-EN2T Ethernet communication module
  • ESD shielding bag
  • Protective packaging
  • Installation documentation when supplied

3. Product Introduction

The 1756-EN2T installs directly into a ControlLogix chassis as the Ethernet communication bridge between the controller platform and external EtherNet/IP networks. It provides a single 10/100 Mbps twisted-pair Ethernet interface and supports TCP/IP and EtherNet/IP communication services for industrial automation systems (which is critical when maintaining distributed control architectures with multiple network nodes).

This module is a network infrastructure asset, not simply a plug-in communication accessory. Inspect the RJ45 port, backplane connector, module label, and firmware revision before replacement. Check the date code. Older communication modules may require firmware alignment with the existing ControlLogix controller and Studio 5000 project environment.

4. Core Technical Specifications

Parameter	Value
Manufacturer	Allen-Bradley / Rockwell Automation
Model Number	1756-EN2T
Product Family	ControlLogix
Module Type	EtherNet/IP Communication Module
Ethernet Interface	1 × RJ45 Copper Port
Communication Speed	10/100 Mbps
Protocol Support	EtherNet/IP, TCP/IP
Maximum TCP Connections	128
Maximum CIP Connections	256
CIP Unconnected Messages	128 + 128 (backplane + Ethernet)
Mounting Method	ControlLogix chassis, 1 slot
Power Supply	5.1 VDC chassis backplane
Current Draw	1.0 A @ 5.1 VDC; 3 mA @ 24 VDC
Power Dissipation	Approx. 5.1 W
Thermal Dissipation	Approx. 17.4 BTU/hr
Isolation Voltage	30 V continuous
Ethernet Cable Type	IEEE 802.3 compliant twisted pair
Enclosure Rating	Open-style module
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Humidity	5–95% RH non-condensing
ATEX Temperature Code	T4

A-B 1756-EN2T

5. Global Compliance & Industry Certifications

Expected regulatory approvals and compliance considerations for the Allen-Bradley 1756-EN2T include:

• CE Mark — applicable for electromagnetic compatibility requirements when installed within an approved ControlLogix system.
• UL/cUL Listed or Recognized — supports industrial control panel installations using approved configurations.
• ATEX Temperature Code T4 — indicates suitability considerations for certain potentially explosive environments when all installation requirements are satisfied.
• IEC Industrial EMC Standards — relevant due to Ethernet communication operation in electrically noisy plant environments.
• Marine Approvals (DNV GL) — require confirmation for specific marine-certified system configurations.

EMC certification is important for Ethernet communication modules because electrical noise, grounding issues, or poor cable installation can interrupt industrial network communication.

Verify specific lot certifications with OEM.

6. Long-Term Storage & Asset Preservation Guide

• Keep the 1756-EN2T inside its original anti-static ESD shielding bag during warehouse storage. Protect the backplane connector and RJ45 interface from contamination.
• Maintain storage humidity below 60% RH. Moisture can degrade PCB insulation properties and connector contact surfaces over extended periods.
• Store the module in a temperature-controlled cabinet away from vibration, dust, and chemical vapors.
• Record the firmware revision, serial number, and hardware series before placing the unit into spare inventory. Communication modules are often firmware-dependent.
• Do not repeatedly insert and remove the module during inspection cycles. The retaining mechanism and backplane contacts are designed for controlled installation.

7. Physical Installation Prerequisites

• Install the 1756-EN2T only in a compatible ControlLogix chassis.
• Confirm chassis power capacity before adding the communication module.
• Leave sufficient cabinet space for convection cooling.
• Maintain approximately 50 mm clearance above and below the chassis assembly where cabinet design permits.
• Connect the Ethernet cable using proper industrial routing practices.
• Use shielded Ethernet cable where required by the installation environment.
• Verify grounding and bonding of the control cabinet.
• Confirm IP addressing, firmware compatibility, and network configuration before commissioning.
• Ensure the module is fully seated and locked into the chassis.
  

  A-B 1756-EN2T

8. Buyer’s FAQ (Logistics & Compliance Focus)

Q: What HS Tariff Code is commonly used for the Allen-Bradley 1756-EN2T?

A: Industrial PLC communication modules are commonly reviewed under HS 8537 or HS 8538 classifications depending on the customs interpretation of the equipment function. Final classification should be confirmed by the importer or customs broker.

Q: Why does Country of Origin (COO) matter for this Ethernet module?

A: COO affects customs clearance, duty assessment, trade documentation, and asset traceability. The declared origin should match the commercial invoice, packing list, and certificate of origin when required.

Q: Should shipping insurance be arranged for the 1756-EN2T?

A: Recommended. The module contains PCB assemblies, communication components, and precision backplane contacts. Shock, moisture, or electrostatic exposure during transport can create failures that are not visible during receiving inspection.

Q: Does the 1756-EN2T include the latest firmware pre-loaded?

A: The module is shipped with factory-installed firmware according to its production revision. Verify firmware compatibility with the ControlLogix controller, Studio 5000 project, and existing EtherNet/IP network configuration before commissioning.