Allen Bradley 1756-CNBR ControlLogix Communication Module

Overview

The 1756-CNBR ControlLogix Communication Module from Allen-Bradley is a redundant ControlNet bridge designed for high-reliability industrial communication. As an enhanced version of the 1756-CNB, it features dual BNC ports for redundant media connections, ensuring continuous communication in mission-critical automation environments.

Technical Specifications

Functional Highlights

• Dual BNC ports enable redundant media connections for improved network reliability.

• Supports both scheduled and unscheduled data bridging between ControlLogix backplanes and ControlNet networks.

• Provides deterministic communication at 5 Mbps for real-time control applications.

• Buffers up to 20 unconnected messages for flexible control architectures.

• Compatible with multiple ControlLogix chassis and redundant power supply configurations.

• RJ45 Network Access Port (NAP) allows local programming access.

• Designed for continuous process industries and critical manufacturing operations requiring high availability.

Application Scenarios

• Distributed I/O implementations in large-scale automation systems.

• Continuous process industries such as petrochemical and power generation.

• Manufacturing environments requiring redundant communication for uninterrupted operation.

• Mission-critical applications where deterministic communication is essential.

FAQ

Q: How does the 1756-CNBR differ from the 1756-CNB? A: The 1756-CNBR adds dual BNC ports for redundant media connections, improving network reliability.

Q: What is the maximum number of supported network nodes? A: Up to 99 nodes can be connected within a ControlNet network.

Q: Can this module be used in redundant power supply configurations? A: Yes, it supports both standard and redundant power supply setups.