Secure now: Allen-Bradley 1769-CLL1 Bus Expansion Cable
Atlantechdrives provides you the 1769-CLL1, a high-quality 1-meter (3.28 ft) expansion cable designed for the 1769 Compact I/O system. This specialized cable allows for «Left-to-Left» bus connectivity, enabling engineers to design complex multi-bank I/O layouts where the physical orientation of the racks requires a connection between the left-side bus ports.
- Length: 1 Meter (3.28 ft)
- Cable Type: Left-to-Left (Bus Expansion)
- Protocol: Proprietary 1769 CompactBus
- Function: Backplane data and power extension
- Compatibility: All 1769-L2x and 1769-L3x controllers and I/O banks
Technical Performance: Maintaining High-Speed Backplane Sync
Procure now the 1769-CLL1 to ensure your distributed I/O architecture maintains the highest signal integrity. In large industrial panels, a single DIN rail is often insufficient to house all required modules. The 1769-CLL1 is technically engineered to extend the CompactBus signals—including high-speed clock synchronization and differential data pairs—across separate rails. Unlike generic cables, the CLL1 is manufactured with specific impedance characteristics to prevent signal reflection, which can cause the dreaded «Bus Error» (solid red I/O LED). When you order the 1769-CLL1, you are securing a link that allows your CompactLogix processor to communicate with expansion banks as if they were physically adjacent, preserving the deterministic nature of your Logix5000 program.
Installation Advice: Cable Routing and Power Constraints
When installing the 1769-CLL1, routing is critical. Do not route the expansion cable in the same duct as high-voltage AC lines or VFD outputs, as the resulting EMI can inject noise into the backplane data. Furthermore, remember that the 1769-CLL1 does not carry sufficient power to run a second bank of I/O on its own. Every expanded bank connected via a CLL1 cable **must** have its own 1769-PA2 or PB2 power supply to locally provide the 5V and 24V DC for the modules in that bank. Always verify that the locking latches on the cable connectors are fully engaged to prevent vibration-induced communication faults. Sourcing from Atlantechdrives guarantees an authentic Allen-Bradley cable with verified shielding for industrial reliability.
Maintenance and Signal Health
The 1769-CLL1 is a passive component but should be inspected during yearly PM routines. Check the high-density pins for any signs of bending or oxidation. If your system reports intermittent I/O faults, the expansion cable is often the first suspect due to mechanical stress. Sourcing your 1769-CLL1 from Atlantechdrives ensures you receive a unit that meets original Rockwell Automation specifications for backplane capacitance and noise immunity.
FAQs
Q: Can I use the 1769-CLL1 for a Right-to-Left connection?
A: No. The 1769-CLL1 is specifically for Left-to-Left expansion. For standard Right-to-Left runs, use the 1769-CRL series.
Q: Does the cable length affect the PLC scan time?
A: While the cable introduces a negligible delay, the Logix engine compensates for it. However, you should never chain more cables than the 1769 architecture supports (3 banks total).
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This bus expansion cable is essential for linking separate I/O banks; remember to terminate the communication chain with a 1769-ECR end cap.
