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Allen-Bradley 1768-CNBR CompactLogix ControlNet Module
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- Part Number: 1768-CNBR
- Brand: Allen-Bradley
- Type: Communication Modules
- Barcode: USA
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Product Description
The Allen-Bradley 1768-CNBR serves as the primary 1768-CNBR ControlNet Bridge Module utilized to execute redundant deterministic network communications across CompactLogix 1768 platforms.
Suffix Breakdown & Model Matrix
| Base Part Number | Suffix | Hardware Revision Description |
|---|---|---|
| 1768-CNB | -R | Dual BNC port architecture supporting redundant coaxial media channels |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1768-CNBR |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.26 kg (0.56 lbs) |
| Dimensions | Single-slot CompactLogix 1768 module footprint |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Standard 1768 backplane power allocation |
| Communication Rate | 5 Mbps |
| Logix Connections | 48 connections |
| Max Nodes | 99 nodes |
| Physical Ports | 2 x ControlNet BNC ports, 1 x ControlNet RJ45 NAP |
| Cable Type | Quad-shield RG-6 coaxial cable |
| Humidity | 5% to 95% (non-condensing) |
ControlNet Deterministic Networks and Redundant Media Topology
- ControlNet Deterministic Networks: Delivers deterministic, high-speed 5 Mbps command data transfer supporting up to 48 concurrent CIP connections across 99 nodes on a scheduled ControlNet network segment.
- Redundant Media Topology: Features dual BNC coaxial ports (Channel A and Channel B) to maintain active media redundancy, automatically switching communication channels in the event of a cable break or signal loss.
- Firmware Flash Compatibility: Integrates into Studio 5000 / RSLogix 5000 configuration environments for node address assignment, network scheduling, and firmware updates across the 1768 backplane bus.
Frequently Asked Questions
Q: What is the primary operational difference between the 1768-CNB and 1768-CNBR modules?
A: The 1768-CNBR includes dual BNC connectors to support redundant coaxial media cabling, whereas the 1768-CNB provides a single BNC port for non-redundant media operation.
Q: What type of cabling is required to connect the 1768-CNBR to a ControlNet trunk line?
A: The module requires 75-ohm quad-shield RG-6 coaxial cable terminated with standard BNC connectors and proper 75-ohm end-of-line terminators.
Q: How many concurrent logical connections can the 1768-CNBR maintain?
A: The module supports up to 48 concurrent Logix connections across a maximum of 99 network nodes.
Field Installation Guidelines
- Module Mounting: Seat the module securely into any available slot on the 1768 system chassis to the left of the processor, locking top and bottom retainers.
- Coaxial Cable Connection: Connect Channel A and Channel B quad-shield RG-6 coaxial cables to the respective front BNC connectors. Verify 75-ohm terminators are installed at both physical ends of each trunk line.
- NAP Interface Usage: Use the RJ45 Network Access Port (NAP) strictly for temporary local diagnostics or programming terminal attachment using a compatible network access cable.
- Chassis Grounding: Ensure the 1768 chassis mounting surface or DIN rail maintains a low-impedance connection to cabinet ground to safeguard signal processing circuitry from high-frequency noise.
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