A-B 1756-EN2T Ethernet Module

Allen-Bradley 1756-EN2T EtherNet/IP Communication Module

 

 

The Allen-Bradley 1756-EN2T is a ControlLogix EtherNet/IP communication module used to connect a ControlLogix PLC system to industrial Ethernet networks. It supports real-time control, HMI communication, remote I/O, drives, and PLC-to-PLC data exchange.

It is a more advanced replacement of the older 1756-ENBT module, offering higher connection capacity and better performance.

Key Specifications

• Model: 1756-EN2T
• Brand: Allen-Bradley (Rockwell Automation)
• Series: ControlLogix 1756
• Type: EtherNet/IP Communication Module
• Communication Rate: 10/100 Mbps
• Port: 1 × RJ45 Ethernet port
• Protocols: EtherNet/IP, TCP/IP
• Connections Supported:
  • Up to 128 TCP connections
  • Up to 256 CIP connections (implicit + explicit)
• Power Consumption: ~5.1 W
• Mounting: ControlLogix chassis slot (any slot)
• Operating Temperature: 0–60°C

What it does (simple explanation)

PLC CPU (ControlLogix)
↓
1756-EN2T Ethernet Module
↓
Industrial Ethernet network (EtherNet/IP)
↓
HMI / VFD / Servo / Remote I/O / Other PLCs

It is basically the “network gateway” of the PLC system.

Main Functions

• Connects PLC to Ethernet/IP network
• Exchanges real-time I/O data with devices
• Connects HMIs (PanelView systems)
• Communicates with VFDs and servo drives
• Links remote I/O (Flex I/O, ArmorBlock, etc.)
• Enables PLC-to-PLC communication
• Supports SCADA integration

Key Features

• High-performance EtherNet/IP communication
• 128 TCP + 256 CIP connection capacity
• 10/100 Mbps industrial Ethernet support
• Supports implicit (I/O) and explicit messaging
• Can handle distributed control systems
• Rugged industrial-grade design (ControlLogix chassis module)

Applications

• Factory automation systems
• PLC networking and distributed I/O
• Servo and VFD control systems
• SCADA and HMI integration
• Machine-to-machine communication
• Large-scale production lines