Allen-Bradley 1747-C20 SLC 500 Programming and Communication Cable

Technical Specifications Breakdown

Key parameters for the 1747-C20 are listed below for quick reference:

Industry Applications

The 1500V DC isolation protects sensitive programming equipment from ground loops and transient voltages common in industrial environments. The 6.09-meter length allows technicians to position laptops or handheld programmers safely away from energized panels while maintaining a secure connection. The DH-485 protocol supports multi-drop networks, enabling efficient data collection from multiple controllers without additional hardware.

Installation and Setup Guidance

When connecting the 1747-C20, ensure the clip-on connector is fully seated into the SLC 500 programming port until it locks audibly. Avoid sharp bends or kinks in the cable to maintain signal integrity. For extended runs, use the 1747-AIC Isolated Link Coupler to boost signal strength and maintain isolation. Always power down the SLC 500 chassis before connecting or disconnecting the cable to prevent damage to the communication ports. Verify that the programming software (e.g., RSLogix 500) is configured for DH-485 protocol at the correct baud rate.

Maintenance and Reliability

The 1747-C20 is built with EMI protection to resist electromagnetic interference from motors, drives, and other industrial equipment. Periodically inspect the cable for cuts, abrasions, or connector damage. Clean the clip-on connector contacts with a dry, lint-free cloth if oxidation is visible. Store the cable in a clean, dry area when not in use to prolong its service life. The robust construction and 1500V DC isolation contribute to long-term reliability in harsh environments.

Reliable Communication for SLC 500 Controllers

Industrial automation systems demand robust and secure connections for programming and data exchange. The Allen-Bradley 1747-C20 is a specialized programming and communication cable engineered specifically for SLC 500 controllers. With a length of 6.09 meters (20 feet), this cable provides the flexibility needed to connect controllers to programming devices in various panel layouts and field environments. Its design focuses on reliable data transmission and electrical isolation, making it a critical component for maintaining uptime in manufacturing processes.

Compatibility and Integration

This cable is fully compatible with the 1747-AIC Isolated Link Coupler, 1747-PIC Personal Interface Converter, and 1747-DTAM-E Data Table Access Module. It supports the DH-485 communication protocol, which is widely used in Allen-Bradley SLC 500 networks. The clip-on connector ensures a quick and secure attachment to the controller, reducing setup time. For systems requiring enhanced distance or multiple nodes, integrate the 1747-AIC to extend the network while maintaining isolation.

Selection Guide and Purchasing Advice

When selecting a programming cable for your SLC 500 system, the 1747-C20 offers a proven balance of length, isolation, and protocol support. Its 20-foot length is suitable for most panel-to-workstation distances. For longer runs, consider the 1747-AIC coupler. Verify that your programming device has a compatible DH-485 interface or use the 1747-PIC converter. AutoDCSTech stocks the 1747-C20 and can advise on availability and lifecycle status. Contact our team to confirm stock and lead times before ordering.

Troubleshooting and Common Issues

If communication fails, first check that the clip-on connector is fully engaged and that the cable is not damaged. Verify that the DH-485 network terminations are correct and that no duplicate node addresses exist. If intermittent errors occur, inspect the cable for EMI exposure; relocate it away from high-power cables or drives. The 1500V DC isolation helps prevent ground loops, but ensure the SLC 500 chassis is properly grounded. For persistent issues, test with a known-good 1747-C20 or consult the SLC 500 installation manual.