Product Overview
In CompactLogix systems, expanding I/O beyond a single power supply often creates wiring and configuration challenges. The Allen-Bradley 1769-CRL3 solves this by providing a reliable right-to-left bus expansion cable that links additional banks of I/O modules seamlessly. This 3.28-foot cable extends the 1769 backplane, allowing up to three banks of modules with their own power supplies, while maintaining clean and organized wiring.
Part of the CompactLogix product line, the 1769-CRL3 is not a module or power supply but a dedicated expansion cable. It connects the right bank of one base unit to the left bank of another, extending the communication bus. With its rugged design and precise specifications, it ensures stable data transfer in demanding industrial environments.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number / Catalog No. |
1769-CRL3 |
| Product Line |
CompactLogix |
| Module Type |
Expansion Cable |
| Shipping Weight |
2 lbs. |
| Shipping Dimensions |
8 x 8 x 5 in. |
| Series |
A and B |
| Isolation Voltage |
30 Volts Continuous |
| Enclosure |
Open |
| Backplane Current |
1.4 Amps at 24 Volts |
| Power Consumption |
33.6 Watts |
| Power Dissipation |
7.5 Watts |
The 1769-CRL3 supports both Series A and B hardware, offering flexibility for system upgrades. Its open enclosure design facilitates heat dissipation, while the 30V continuous isolation voltage protects against electrical noise. With a backplane current rating of 1.4A at 24V, it reliably powers the bus communication lines.
Installation & Setup
Installing the 1769-CRL3 is straightforward. Connect the cable between the right bank of one base unit and the left bank of the next, ensuring the connectors align properly. The cable is designed for horizontal or vertical orientation, providing configuration flexibility. Always power down the system before connecting or disconnecting the cable to prevent damage.
Verify that the total number of expansion cables in the system does not exceed two, as the 1769 architecture permits a maximum of three I/O banks. Proper routing of the cable avoids sharp bends and excessive strain, ensuring long-term reliability.
Compatibility & Integration
The 1769-CRL3 integrates with CompactLogix controllers, including the DriveLogix 5730. It works with any 1769 Compact I/O modules that require bus extension. The cable supports both horizontal and vertical mounting, making it adaptable to various panel layouts. Its right-to-left configuration is essential when expanding the system beyond a single power supply.
Maintenance & Reliability
To maintain optimal performance, inspect the 1769-CRL3 periodically for signs of wear, such as cracked insulation or damaged connectors. Keep the cable away from excessive heat, moisture, and corrosive atmospheres. The cable operates in temperatures from 0 to 60°C (32 to 140°F) and can be stored between -40 and 85°C. Regular visual checks and proper cable management will extend service life and reduce downtime.
Selection Guide
When selecting the 1769-CRL3, confirm your system's expansion requirements. Ensure your base units have the appropriate right and left bank connectors. If you are upgrading an existing system, verify compatibility with your current CompactLogix series (A or B). For reliable sourcing and genuine Allen-Bradley parts, consider PLC Source PRO for your industrial automation needs.