For automation engineers, few things are as frustrating as launching a powerful SCADA system only to be greeted by a cryptic error message. If you use Siemens WinCC 7.5, you may have encountered the dreaded alert: This article provides the most comprehensive, best-practice guide to understanding and resolving this issue once and for all.
C:\ProgramData\Siemens\WinCC\Common\AlarmControl\ C:\ProgramData\Siemens\WinCC\Common\TagLogging\ C:\Users\[YourUsername]\AppData\Local\Siemens\WinCC\RTTemp\
Ensure installation order was correct:
Open the Siemens Automation License Manager (ALM) from your Windows Start menu.
contain special characters (like underscores), which can corrupt SQL installations. Run Reset_WinCC Navigate to your WinCC installation directory (typically C:\Program Files (x86)\Siemens\WinCC\bin ) and run the script Reset_WinCC.vbs a basic application could not be started wincc 75 best
If the error persists, the SQL instance may be corrupted. Users often find success by completely uninstalling WinCC and the manual removal of all MS SQL Server components before reinstalling. Community Insights on Fixes
In ALM, right-click your drive and select Check > License Key to force the manager to re-index and validate keys that may have become corrupted due to unexpected system shutdowns. 2. Rectify OS Mismatches and Install Service Packs For automation engineers, few things are as frustrating
Open the Siemens Compatibility Tool via the official Siemens SiePortal to map your exact Windows build number against your WinCC iteration. Apply the Correct Update:
Click , let Windows download the necessary files, and restart your computer. 4. Delete Corrupted Project Cache Files ( .dcf ) Community Insights on Fixes In ALM, right-click your
If the basic troubleshooting steps do not resolve the issue, try the following advanced troubleshooting steps:
If none of these work, please share: