from your WinCC installation's bin directory or search for "Reset-WinCC" in your start menu. Restart your PC afterward. Install Latest Updates
Overzealous security software blocking critical Siemens binaries. Step-by-Step Solutions
Right-click "This PC" and go to "Manage" > "Local Users and Groups" > "Groups". Ensure your Windows login is a member of: SIMATIC HMI SIMATIC HMI Viewer (if applicable) SQLServer2005MSSQLUser$ $WINCC
Ultimate Troubleshooting Guide: Fixing the WinCC v7.5 "A Basic Application Could Not Be Started" Error a basic application could not be started wincc 75 best
| Cause Category | Specific Issue | |----------------|----------------| | | WinCC runtime services lack administrator rights or UAC blocks processes. | | Antivirus / Firewall | Real-time scan blocks RTMessages.exe , PdlRt.exe , or CCEServer.exe . | | License Malfunction | Missing or corrupted license for the basic runtime (e.g., RT 128/512/1024). | | Project Corruption | Damaged .mdf / .ldf database files or inconsistent project configuration. | | SQL Server Issues | SQL Server 2016/2019 instance for WinCC not running or blocked. | | Windows Updates | Recent .NET or VC++ redistributable updates breaking WinCC dependencies. | | Multi-User Conflicts | Another WinCC runtime or demo project already active. |
Add your Windows user account to the SIMATIC_HMI group. Steps: Open Computer Management ( compmgmt.msc ). Navigate to Local Users and Groups > Groups . Double-click SIMATIC_HMI . Click Add... and enter your Windows user name. Restart the computer . 3. Check Network Adapter Binding (Terminalbus)
: You must run WinCC using a Windows account that belongs to the local SIMATIC HMI user group. from your WinCC installation's bin directory or search
to ensure all DCOM and firewall permissions are correctly applied. Deep-Dive Troubleshooting
Right-click the application and select . Click the Repeat Settings or Apply button.
If it fails to start, check the Windows Event Viewer for SQL-related errors. 4. Check License Status (Automation License Manager) Step-by-Step Solutions Right-click "This PC" and go to
Once you identify the failing module, download the relevant update from Microsoft or Siemens Support.
Regularly use the Reset_WinCC.vbs utility after major system changes or project corruption.
If the error persists, it is often necessary to uninstall WinCC and the SQL Server instance separately. Reinstall them from scratch to ensure a clean database connection. 4. Check Licensing and User Permissions
The user running WinCC is not part of the SIMATIC HMI group.
The "basic application could not be started" message is generic. Windows Event Viewer will tell you exactly which application failed.