If you have ever worked with Siemens WinCC (TIA Portal or Classic), you have likely encountered the term WinCC Runtime Loader —either as a background process in Task Manager or as a frustrating error message preventing your HMI from starting.
The loader successfully validated the project but cannot establish communication with the target runtime environment. This is almost always a firewall, SQL, or User Account Control (UAC) issue. wincc runtime loader
A child process (e.g., a custom C-script or a SQL query) did not terminate gracefully. The loader is waiting for a handle that will never close. If you have ever worked with Siemens WinCC
WinCC Runtime Classic (pre-TIA) checks for a physical graphics adapter. Remote sessions use a virtual display driver. A child process (e
The loader caches compiled binaries ( *.PDL , *.MCP ) from the old version.
About the author: A automation systems integrator with 10+ years of experience in Siemens TIA Portal, PCS 7, and WinCC Open Architecture.
