WinCC and SQL Server are extremely sensitive to computer names. Ensure your PC name has no special characters or underscores ( 2. Verify Compatibility and Updates
Sometimes background scripts or active windows objects require explicit administrative rights to initialize.
If the above steps fail, you may have a corrupted SQL instance. As suggested on Reddit/PLC and Siemens forums , a complete reinstallation is required.
Ensure a valid or WinCC RT (Runtime) license key is present. a basic application could not be started wincc 75
WinCC V7.5 is designed to run a single active project per runtime instance. A frequent cause of this error is attempting to start a new project while a previous project is still "residual" in the system memory or registry.
Fixing the "A Basic Application Could Not Be Started" Error in WinCC 7.5
The Windows user account attempting to run WinCC lacks membership in the mandatory Siemens automation security groups. WinCC and SQL Server are extremely sensitive to
Remember: . It often worsens corruption. Instead, methodically diagnose using Event Viewer and the WinCC Diagnosis Tool. With patience and the steps above, you will identify the root cause and implement a permanent fix.
This reduces Windows security. Only do this on isolated industrial networks (PCS 7 / Plant networks).
Users typically report this error in the following situations: If the above steps fail, you may have
To know exactly why it failed, check the Windows Event Viewer: Open Event Viewer ( eventvwr.msc ). Go to Windows Logs -> Application .
"A basic application could not be started" in WinCC 7.5 often indicates a mismatch between the software version and the Windows operating system, or issues with user permissions and required background services Quick Fixes to Try First Run as Administrator : Right-click the WinCC Explorer shortcut and select Run as Administrator to ensure all processes have necessary permissions. Reset WinCC : Go to the WinCC installation folder (e.g., C:\Program Files (x86)\Siemens\WinCC\bin Reset_WinCC.vbs . Restart your computer afterward. Verify User Groups : Ensure your Windows user account is a member of both the Administrator SIMATIC HMI local user groups. Common Root Causes and Solutions
This is the most effective immediate fix for transient errors.
Cross-reference your OS build with the official Siemens Compatibility Tool.
WinCC requires specific licenses for runtime components (Power Tags, Archive licenses, etc.).
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