A-B 1756-ENBT Ethernet Module

Allen-Bradley 1756-ENBT EtherNet/IP Communication Module

 

 

The Allen-Bradley 1756-ENBT is an EtherNet/IP communication module used in the ControlLogix 1756 platform. It allows the PLC system to communicate over Ethernet networks for I/O control, HMI connection, PLC-to-PLC data exchange, and SCADA integration.

It is an older generation Ethernet bridge module in the ControlLogix family (later replaced by EN2T / EN3TR / EN4TR).

Key Specifications

• Model: 1756-ENBT
• Brand: Allen-Bradley (Rockwell Automation)
• Series: ControlLogix 1756
• Type: EtherNet/IP Communication Module
• Network: EtherNet/IP
• Port: 1 × RJ45 (10/100 Mbps)
• Connections Supported:
  • Up to 64 TCP connections
  • Up to 128 CIP connections
• Function:
  • Ethernet communication bridge between PLC and devices
• Mounting: ControlLogix chassis slot module
• Power Consumption: ~3.7 W

What it does (Simple Explanation)

PLC CPU (ControlLogix)
↓
1756-ENBT Ethernet Module
↓
EtherNet/IP Network
↓
HMI / Drives / Remote I/O / Other PLCs

It enables the PLC to “talk” over Ethernet.

Main Functions

• PLC Ethernet communication (EtherNet/IP)
• Remote I/O networking (ControlLogix / Flex I/O / ArmorBlock)
• HMI and SCADA connectivity
• PLC-to-PLC data exchange
• Device configuration and monitoring
• Network routing inside industrial control systems

Key Features

• 10/100 Mbps industrial Ethernet communication
• Supports EtherNet/IP protocol
• 1 RJ45 copper port
• Supports implicit & explicit messaging
• Integration with ControlLogix backplane system
• Reliable industrial-grade communication module

Applications

• Factory automation networks
• Distributed I/O systems
• PLC communication bridges
• SCADA systems
• HMI integration
• Drive (VFD/servo) networking
• Industrial Ethernet backbone systems