Description
Allen-Bradley 1756-CNB: ControlNet Bridge Module for Industrial Networks
High-speed interface connecting ControlLogix chassis to ControlNet networks. Ideal for distributed I/O systems and multi-protocol bridging. Ensures reliable data transfer in harsh environments
Technical Specifications
| Brand | Allen-Bradley/Rockwell Automation |
| Model | 1756-CNB |
| Series | ControlLogix |
| Communication Rate | 5,000 kbps |
| Max Nodes | 99 |
| Power Consumption | 5.1W (970mA @ 5.1V DC) |
| Operating Temp | 0°C to 60°C (32°F to 140°F) |
| Weight | 0.26 kg (0.57 lbs) |
| Certifications | UL, CE, CSA, ATEX :cite[4] |
Installation Guide
- Set unique node address (01-99) via front-panel switches
- Use shielded ControlNet cable (1786-RG6) for BNC port
- Install in ControlLogix chassis – Single-slot width
- Allow 50mm ventilation space around module
Diagnostics & Maintenance
- Monitor via front-panel text display (shows node/connection status)
- Check error counters in Studio 5000 Logix Designer
- Clean ports with dry air quarterly to prevent dust buildup
- Verify connection health using LED indicators (green=normal, red=fault)
Packaging Includes
- 1756-CNB Communication Module
- Installation documentation
- Node address labels
Shipping Options
FedEx | UPS | DHL – Global 3-5 day delivery
Industry Applications
- Automotive assembly lines – Machine synchronization
- Power plants – Distributed control systems
- Packaging machinery – High-speed I/O control
- Water treatment – Remote monitoring networks
FAQ
Q: Is this module redundant?
A: No – For non-redundant systems only (use 1756-CNBR for redundancy)
Q: Does it support EtherNet/IP?
A: Indirectly – Bridges ControlNet to EtherNet/IP networks
Q: Battery backup required?
A: No – Configuration stored in non-volatile memory
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