Allen-Bradley 1756-CNBR/E | ControlNet Communication Module

Overview

The Allen-Bradley 1756-CNBR/E is a ControlNet communication module engineered for ControlLogix systems. It ensures reliable industrial communication by supporting redundant ControlNet networks, which provide higher system availability. With compact dimensions of 284 × 194 × 69 mm and a weight of only 0.293 kg, the module is well-suited for space-constrained control cabinets.

Technical Specifications

• Catalog Number: 1756-CNBR/E

• Module Type: ControlNet Redundant Bridge Module, Series E

• Network Support: ControlNet protocol, 5 Mbps communication rate

• Redundancy: Dual ControlNet channels for improved reliability

• Connections Supported: 64 maximum, 40–48 Logix connections

• Maximum Nodes: 99

• Power Requirements: 1.0 A at 5.1 VDC; 2 mA at 24 VDC

• Power Dissipation: 5.1 W

• Operating Temperature: 0 °C to 55 °C (32 °F to 131 °F)

• Relative Humidity: 5% to 95% non-condensing

• Dimensions: 284 × 194 × 69 mm

• Weight: 0.293 kg

Key Features

The 1756-CNBR/E provides redundant ControlNet channels that reduce downtime risks and improve communication stability in critical systems. Its high connection capacity supports up to 64 devices and a maximum of 99 network nodes, ensuring scalability for expanding industrial networks.

Designed for industrial automation, the module combines low power dissipation of 5.1 W with rugged performance. Its LED indicators and modular design simplify installation, diagnostics, and integration with existing ControlLogix controllers.

Industrial Applications

The Allen-Bradley 1756-CNBR/E is widely used in process control, machine automation, and plant-wide communication networks. Its redundant network capability makes it particularly valuable in safety-critical and high-availability applications, ensuring reliable data exchange across distributed systems.