Allen-Bradley|1756- CNBR|ControlLogix ControlNet Interface Module
Description
The Allen-Bradley 1756-CNBR is a ControlLogix ControlNet interface module designed for industrial automation, providing reliable communication and integration within ControlLogix systems.
Features
- Redundant Media Support
- Automatic Fault Detection
- Enhanced Diagnostics
- ControlNet Network Integration
Technical Specifications
-
Electrical Characteristics:
- Input Voltage Range: 85–265V AC
- Maximum Input Power: 120VA
-
Firmware Enhancements:
- Revision 5.50: Improved CPU utilization accuracy at high utilizations.
- Revision 5.44: Provided more descriptive error messages for fatal conditions.
- Revision 5.39: Enhanced buffer usage diagnostics.
- Revision 5.38.40: Added sub-minor revision numbers for better pre-release identification.
-
Corrected Anomalies:
- Fixed single-channel modules causing network disruptions.
- Resolved module faults during ControlNet disruptions.
- Corrected delays in sending scheduled data by one network interval.
-
Connection Limitations:
- Up to five ControlLogix controllers can connect via rack optimization; additional connections fail with error 16#011a.
-
CPU Utilization Calculation:
- Reduced overestimation errors by up to 10% at 10% utilization, decreasing linearly to 1% at 90% utilization.
Allen-Bradley|1756- CNBR|ControlLogix ControlNet Interface Module


Allen-Bradley|1756- CNBR|ControlLogix ControlNet Interface Module
Description
The Allen-Bradley 1756-CNBR is a ControlLogix ControlNet interface module designed for industrial automation, providing reliable communication and integration within ControlLogix systems.
Features
- Redundant Media Support
- Automatic Fault Detection
- Enhanced Diagnostics
- ControlNet Network Integration
Technical Specifications
-
Electrical Characteristics:
- Input Voltage Range: 85–265V AC
- Maximum Input Power: 120VA
-
Firmware Enhancements:
- Revision 5.50: Improved CPU utilization accuracy at high utilizations.
- Revision 5.44: Provided more descriptive error messages for fatal conditions.
- Revision 5.39: Enhanced buffer usage diagnostics.
- Revision 5.38.40: Added sub-minor revision numbers for better pre-release identification.
-
Corrected Anomalies:
- Fixed single-channel modules causing network disruptions.
- Resolved module faults during ControlNet disruptions.
- Corrected delays in sending scheduled data by one network interval.
-
Connection Limitations:
- Up to five ControlLogix controllers can connect via rack optimization; additional connections fail with error 16#011a.
-
CPU Utilization Calculation:
- Reduced overestimation errors by up to 10% at 10% utilization, decreasing linearly to 1% at 90% utilization.