Core Technical Specifications
- Manufacturer: Allen-Bradley / Rockwell Automation
- Model Number: 1756-CNBR
- Product Line: ControlLogix
- Module Type: ControlNet Redundant Bridge
- Network Nodes: Supports up to 99 nodes
- Communication Speed: 5 Mbps
- Bidirectional Connections: Up to 64 connections
- Unconnected Messages: Buffers up to 20 messages
- Backplane Current: 970 mA @ 5.1V DC; 1.7 mA @ 24V DC
- Power Dissipation: 5.1 Watts
- Thermal Dissipation: 17.4 BTU/hr
- Net Weight: 0.25 kg
- Dimensions: 17 x 13 x 3.2 cm
Deterministic Performance and Architecture
The 1756-CNBR ensures time-critical data arrives at scheduled intervals. This deterministic behavior supports precise synchronization across multiple controller chassis. Moreover, the module supports 40 to 48 logical communication connections. It utilizes quad-shield RG-6 coaxial cables for superior signal protection. These features allow the module to thrive in harsh electromagnetic environments.
The integrated Network Access Port (NAP) provides a local programming interface. This 8-pin RJ45 connector allows technicians to configure the network easily. Furthermore, the module is compatible with all 1756-A series chassis. It functions reliably with both standard and redundant power supply configurations. This broad compatibility ensures easy integration into existing Rockwell Automation infrastructures.
Installation and Field Reliability
Proper installation requires careful orientation of the tap drop cables. This prevents connection reversals that might disrupt the entire network segment. The module supports Removal and Insertion Under Power (RIUP) functionality. Therefore, technicians can replace hardware without shutting down the system. This modular approach simplifies maintenance in large-scale manufacturing plants.
The rugged construction meets high industrial standards for mechanical stability. It provides a flexible solution for both local and remote I/O management. Although Allen-Bradley officially discontinued this model in 2016, brand-new units remain vital. They offer the exact specifications needed to maintain legacy ControlLogix networks. Finally, our current stock ensures immediate availability for your system upgrades or repairs.
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