Product Overview
The Allen-Bradley 1768-CNB is a CompactLogix ControlNet interface module from Rockwell Automation. It supports media redundancy and intrinsic safety applications, making it a reliable choice for demanding industrial environments.
Technical Specifications Breakdown
Key parameters for the 1768-CNB are listed below for quick reference:
| Feature | Specification |
|---|---|
| Device Type | Communication Interface |
| Maximum Connections Supported | 48 Connections |
| Maximum Number of Nodes | 99 Nodes |
| Slot Width | 1 Slot |
| Backplane Current | 1 ampere at 5 volts |
| Power Consumption | 5.14 Watts |
| Power Dissipation | 5.14 Watts |
| Thermal Dissipation | 17.5 BTU/hr |
| ControlNet Network Communication Rate | 5 Mbps |
| Isolation | 30 Volts |
| Operating Temperature Range | 0 - 60 degrees Celsius |
| Nonoperating Temperature Range | -40 - 85 degrees Celsius |
| Dimensions | 132 mm x 56.7 mm x 105.1 mm (5.20 in. x 2.23 in. x 4.12 in.) |
| Approximate Weight | 0.260 kg (0.57 lb) |
Industry Applications
Typical uses include:
- Redundant Controller Systems: The 1768-CNB supports redundant configurations, ensuring continuous operation in critical processes.
- High-Speed Data Transfers: With a 5 Mbps ControlNet communication rate, it handles time-critical data exchange between controllers and I/O.
- Media Redundancy: Its dual-connector design (BNC and NAP) allows for redundant media setups, minimizing downtime.
Installation & Setup Guidance
Mount the module via DIN rail or panel mount on a 1768 ControlLogix chassis. It occupies one slot and can be placed in any slot from 1 to 4. Connect the BNC connector for non-redundant media or use the NAP (RJ45 with shield) for network access. Ensure the backplane current does not exceed 1 ampere at 5 volts. Verify ambient temperature stays within 0 to 60 degrees Celsius during operation.
Maintenance & Reliability
Inspect the module periodically for dust accumulation and secure connections. Operate within the recommended humidity range of 5% to 95% noncondensing. The unit withstands vibration up to 5 g at 10 to 500 Hz and operating shock of 30 g, ensuring robust performance in harsh environments.
Compatibility & Integration
The 1768-CNB integrates with CompactLogix controllers via the ControlNet network. It supports up to 48 connections and 99 nodes, making it suitable for medium to large distributed control systems. Certifications include c-UL-us, CE, C-Tick, and CI, confirming compliance with international standards.
Selection Guide & Purchasing Advice
When selecting a ControlNet interface module, verify that your system requires the 48-connection capacity and 99-node support offered by this unit. For replacement or new installations, contact AutoDCSTech to confirm availability and lifecycle status. AutoDCSTech stocks genuine Allen-Bradley parts to ensure seamless integration.
Troubleshooting & Common Issues
If communication errors occur, check the BNC and NAP connector integrity. Verify that the node count does not exceed 99 and that connections are within the 48 maximum. Monitor thermal dissipation (17.5 BTU/hr) to prevent overheating. For persistent issues, consult the module's isolation rating of 30 volts to rule out ground loops.
Availability & Condition at AutoDCSTech
| Part Number | 1768-CNB |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
