If your C-Series machine is not starting following a 24V power supply failure or after encountering PLC fault 0008 H on a Micrologix 1400, follow this troubleshooting guide to diagnose and resolve the issue.

Step 1: Replace the Power Supply

1. Check for Short Circuits:
   • Before replacing the power supply, ensure there are no shorts between the 24V positive and negative (common) terminals.
   • Use a multimeter to verify the absence of a short circuit.
2. Replace the Power Supply:
   • If no short circuits are found, proceed to replace the 24V power supply.

Step 2: Verify Power to Sensors

1. Check Sensor Power:
   • Ensure that all sensors connected to the machine are receiving power.
   • Inspect the wiring and connections to confirm the sensors are properly powered.

Step 3: Inspect PLC I/O Devices

1. Check PLC Inputs:
   • Verify that the PLC is receiving input signals from all connected devices.
   • Check the wiring and connections of the PLC I/O modules to ensure they are intact and properly connected.

Step 4: Confirm PLC Program Status

1. Check PLC IP Address:
   • Connect to the PLC and check its IP address.
   • If the IP address does not follow the standard pattern, it may indicate that the PLC program has been wiped off.
2. Reload PLC Program:
   • If the program is lost, reload the appropriate PLC program from your backup files.
   • Ensure the IP address is correctly configured to match your network settings.

Additional Tips

• Regular Maintenance:
  • Regularly inspect and maintain the power supply, sensors, and PLC to prevent future issues.
• Backup PLC Programs:
  • Keep regular backups of your PLC programs to quickly restore functionality in case of program loss.

By following these steps, you can diagnose and resolve issues related to power supply failures and PLC faults in your C-Series machine, ensuring it operates smoothly and efficiently. If problems persist, consider reaching out to technical support for further assistance.