Overview

The Allen-Bradley 1756-CNBR is a redundant ControlNet communication bridge module designed for the ControlLogix automation platform. The module provides high-speed, deterministic communication over ControlNet networks while supporting redundant media architectures for enhanced network availability and fault tolerance.

As part of Rockwell Automation's ControlLogix family, the 1756-CNBR enables communication between controllers, distributed I/O systems, HMIs, drives, and other networked automation devices. Its redundant media capability ensures continued network operation in the event of cable or network path failures, making it ideal for mission-critical industrial applications.

The module is widely used in power generation, oil & gas, petrochemical, water treatment, mining, and large-scale manufacturing facilities where high system availability and reliable communications are essential.

Features

Redundant ControlNet Communication

Supports redundant network media for increased system reliability.

Deterministic Data Exchange

Provides scheduled and unscheduled messaging across ControlNet networks.

High Availability Architecture

Reduces communication downtime in critical automation applications.

Seamless ControlLogix Integration

Fully compatible with ControlLogix controllers and distributed I/O systems.

Advanced Diagnostics

Supports network monitoring and troubleshooting functions.

Specification	Details
Product Name	Allen-Bradley 1756-CNBR
Product Type	Redundant ControlNet Communication Bridge Module
Manufacturer	Rockwell Automation
Brand	Allen-Bradley
Series	ControlLogix
Function	Industrial Network Communication
Network Protocol	ControlNet
Communication Speed	5 Mbps
Ports	2 × ControlNet BNC Connectors (Redundant Media)
Mounting Type	ControlLogix Chassis Installation
Backplane Interface	ControlLogix Backplane
Operating Environment	Industrial Grade
HS Code	8517623990
Dimensions (L × W × H)	Approx. 14 × 15 × 5 cm
Weight	Approx. 0.35 kg
Country of Origin	United States
Condition	Brand New & Original
Availability	In Stock
Shipping	Worldwide Delivery
Warranty	Available Upon Request

• ControlLogix automation systems
• Redundant industrial communication networks
• Distributed I/O architectures
• Power generation facilities
• Oil & gas production systems
• Petrochemical plants
• Water and wastewater treatment plants
• Mining automation systems
• Critical process control applications

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