occurs because historical data logging (Tag or Alarm logging) requires a specific add-on license
: If you have "Good Manufacturing Practice" (Audit Trail) enabled, WinCC automatically requires a Logging license because audit trails utilize the system's logging infrastructure. Corrupted Licenses occurs because historical data logging (Tag or Alarm
: If a license is marked as defective, Alex had to contact Siemens Technical Support to have it restored. To prevent this in the future, Alex installed a UPS to ensure a clean shutdown. The “License key not available” error for WinCC
The “License key not available” error for WinCC Logging in Runtime Advanced is almost always a licensing configuration issue. The solution involves confirming that a valid, version-compatible, non-expired license is installed and recognized by Automation License Manager. Following the structured troubleshooting above resolves >95% of cases without requiring software reinstallation. occurs because historical data logging (Tag or Alarm