Allen Bradley 1756-CNBR/E ControlLogix Redundant Bridge Module

Product Introduction

The Allen-Bradley 1756-CNBR/E is an enhanced ControlLogix Redundant Bridge (CNBR) communication module designed to provide high-reliability network bridging and redundancy for ControlNet systems. It ensures continuous, deterministic communication between multiple ControlLogix controllers, I/O modules, and other networked devices, even in the event of a network segment failure.

The 1756-CNBR/E is ideal for mission-critical industrial automation applications where network uptime and data integrity are essential. Its design improves upon standard CNBR modules with enhanced performance and compatibility, making it a key component in high-availability ControlNet architectures.

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Product Specifications

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Applications

• Provides redundant communication in ControlLogix ControlNet networks

• Bridges multiple ControlNet segments to maintain continuous network operation

• Suitable for critical industrial applications requiring high availability and fault tolerance

• Ensures deterministic, real-time data transfer between controllers, I/O modules, and devices

• Ideal for high-performance distributed control systems where network reliability is essential

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Advantages

• Enhanced redundancy features provide continuous network operation in case of failure

• Compact module design allows easy installation in ControlLogix chassis

• Open-style mounting supports flexible panel installation

• Low power and thermal dissipation ensures stable operation

• Seamless integration with ControlLogix controllers simplifies configuration and network setup

• Designed for robust industrial network performance and mission-critical applications

FAQ

1. What is the primary function of the 1756-CNBR/E?
   It provides redundant bridging for ControlNet networks, maintaining continuous communication across multiple network segments.

2. How does it differ from the standard 1756-CNBR?
   The CNBR/E offers enhanced performance, improved reliability, and better network fault tolerance.

3. What are the power requirements for the module?
   It requires 1.0 A @ 5.1 VDC and 2 mA @ 24 VDC.

4. Can it operate in open-style industrial panels?
   Yes, the module has an open-style enclosure rating.

5. What is the operating temperature range?
   It operates from 0 to 60 °C.

6. Does it provide deterministic communication?
   Yes, it ensures real-time data transfer for ControlNet devices and controllers.

7. How many network segments can it bridge?
   It can bridge multiple ControlNet segments depending on system design.

8. Is it compatible with all ControlLogix controllers?
   Yes, it integrates with standard ControlLogix chassis and controllers.

9. Does the module generate significant heat?
   No, power dissipation is 6.7 W with thermal dissipation of 22.9 BTU/h.

10. Why use a CNBR/E instead of a standard CN module?
    CNBR/E provides enhanced redundancy and performance for mission-critical networks that require high availability.

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