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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-60 minutes
Siemens 840D 6692 - Cycle lost
A cycle has been changed and due to a power failure, the backup on the PC card could not be terminated properly. The cycle is lost.
6692
Siemens 840D 6692 - Cycle lost
Cycle lost
A cycle has been changed and due to a power failure, the backup on the PC card could not be terminated properly. The cycle is lost.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- Power failure or sudden power loss during cycle backup operation to PC card
- Improper shutdown of control system while backup procedure was in progress
- Defective or failing PC card preventing proper data write completion
- Corrupted file system on PC card due to interrupted write cycles
- Loose or poor connection between PC card and control module
Troubleshooting Steps
- 1Power cycle the control system using the main disconnect switch, wait 30 seconds, and restart to allow graceful shutdown procedures
- 2Remove the PC card, visually inspect for corrosion, damage, or loose contacts; clean contacts with appropriate electronics cleaner if needed
- 3Reinsert the PC card firmly ensuring proper seating and secure any retention mechanisms
- 4Attempt to restore the lost cycle from a known good backup or archival copy if available in your program library or external storage
- 5If the alarm persists, replace the PC card with a known working unit and reload the affected cycle from external media or network backup
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Always verify with your machine manual or a certified technician before performing service procedures.