The 1768-CNBR module from Allen‑Bradley serves as a dedicated ControlNet bridge for the CompactLogix product line. It offers a deterministic communication link that ensures both data repeatability and predictable update times. This capability proves essential for motion control and process interlocking where timing is critical. Additionally, the 1768-CNBR module supports redundant media configurations. This feature guarantees system availability even if a primary communication path fails. Its architecture allows seamless integration into existing Rockwell Automation environments. Many users choose this module for its proven reliability in demanding industrial settings.
The 1768-CNBR module operates at a fixed communication rate of 5 Mbps. It supports up to 48 Logix communication connections simultaneously. Furthermore, this bridge can manage a maximum of 99 ControlNet nodes on a single network. The module draws 1.0 Amp of current at 5.2 Volts DC during normal operation. It dissipates 5.14 Watts of heat, equivalent to 17.5 BTU per hour. The isolation voltage is rated at 30 Volts, and it withstands a dielectric test of 500 Volts AC for 60 seconds. For physical network interfacing, the 1768-CNBR includes two BNC connectors and one RJ45 port. These ports allow flexible cabling and easy connection to a programming PC.
This module features a compact design with a single slot width. Its physical dimensions are 132 x 56.7 x 105.1 mm (5.20 x 2.23 x 4.12 inches). The unit weighs approximately 0.64 pounds (0.293 kg) without packaging. It operates with a T4 temperature code and uses an open-style enclosure type. The module requires a coaxial RG6 quad shield cable for optimal signal integrity. Its isolation voltage is 30 Volts, with a test voltage of 500 Volts AC for 60 seconds.
One of the standout features of the 1768-CNBR is its support for redundant media configurations. This allows the module to maintain network communication even when one cable path experiences a fault. Consequently, systems using this module achieve higher uptime and improved fault tolerance. The deterministic data delivery mechanism ensures that data packets arrive at predictable intervals. This predictability is particularly valuable in motion control applications where timing precision directly impacts product quality.
First, ensure the power supply to the chassis is completely turned off before installing the 1768-CNBR. Next, select either DIN rail mounting or panel mounting using M4 or #8 screws. For DIN rail installation, simply snap the module onto the rail until the locking tab engages securely. For panel mounting, use the provided mounting holes and fasten it firmly to the backplate. After securing the module, connect the ControlNet cables to the BNC or RJ45 ports as needed. Finally, reapply power and verify that the module status indicators show normal operation.
Allen-Bradley 1768-CNBR ControlNet Bridge Module (1 unit)
Quick start guide (printed sheet)
Mounting hardware kit (DIN rail clip and panel screws)
All orders are shipped worldwide via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours of dispatch.
1. Which CompactLogix controllers work with the 1768-CNBR?
The 1768-CNBR works with any CompactLogix controller that features a 1768 bus interface. For the newer 5069 or 5480 series platforms, please consult the compatibility documentation.
2. Can I use this module in a redundant ControlNet network?
Absolutely. The 1768-CNBR explicitly supports redundant media configurations, making it ideal for high-availability systems where network fault tolerance is required.
3. What is the maximum cable length for the BNC connections?
For RG6 quad shield cable, the maximum segment length is 1,000 meters (3,280 feet) per ControlNet specification. This applies when using the BNC ports on the 1768-CNBR.
4. What is the typical delivery time for this module?
Most orders ship within 1-2 business days. Delivery times vary by destination but typically range from 3 to 7 business days via FedEx, UPS, or DHL.
5. Does this module require a separate external power supply?
No. The 1768-CNBR draws its operating power directly from the CompactLogix backplane. No external 24V DC supply is needed.
| Brand Name | |
| Model No. | 1768-CNBR |
| Product Type | Communication Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
