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Allen-Bradley 1756-CNBR Digital I/O Module

Product Description

The Allen-Bradley 1756-CNBR is a ControlNet redundant bridge module designed for industrial automation systems. It provides high-reliability communication between ControlLogix chassis and ControlNet networks, ensuring seamless data exchange in mission-critical applications. Unlike the standard 1756-CNB, the 1756-CNBR supports redundant configurations, enhancing system fault tolerance and uptime in industrial environments .

Key Features & Advantages

Redundant Communication – Supports dual-path communication for fail-safe operation in critical systems.
High-Speed Data Transfer – Operates at 5 Mbps, facilitating real-time control and monitoring.
Multiple Connection Support – Handles up to 64 bidirectional connections with other ControlNet devices.
Robust Diagnostics – Features LED status indicators for real-time monitoring of network health.
Wide Compatibility – Works with Rockwell Automation’s Logix5000 controllers, Flex I/O, and other ControlNet-compatible devices
Industrial-Grade Durability – Rated for operation in 0°C to 60°C environments with IP20 protection .

Technical Specifications

Parameter	Details
Module Type	ControlNet Redundant Bridge
Communication Protocol	ControlNet
Data Rate	5 Mbps
Max Nodes Supported	99
Input Voltage	24V DC (±10%)
Current Consumption	1.2A max
Isolation Voltage	1500V AC
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 85°C
Mounting	ControlLogix Chassis
Certifications	CE, CSA, UL, GOST

Applications

The 1756-CNBR is widely used in industries requiring high-reliability communication, including:

Manufacturing Automation – Redundant control in assembly lines and robotic systems.
Energy & Power Systems – Substation monitoring and grid control.
Oil & Gas – Critical process control in refineries and pipelines.
Water Treatment – Redundant monitoring of pumps and valves.
Transportation – Railway signaling and traffic management systems .