The message often appears intermittently (for example, every 5 minutes), and while it can be temporarily dismissed, it will keep coming back. In some cases, the alarm logging may still function during a grace period before eventually switching to a "Demo Mode," which can be catastrophic for production environments.
If the IPC or PC station is turned off abruptly (e.g., power failure) while WinCC Runtime is running, the license key can become "defective" or remain locked by the OS, as described in . C. License in Wrong Location The message often appears intermittently (for example, every
The first and most crucial step is to verify exactly which licenses are installed on your system. The ALM is the central tool for managing all Siemens software licenses. : Some Windows security updates can interfere with
: Some Windows security updates can interfere with license detection. Updating to the latest version of Automation License Manager V6.2 SP4 often resolves persistent "not available" errors. . You’ve installed your PowerTags license
When you see this message, the WinCC Runtime engine has detected that your project includes logging functions—such as Data Logs or Alarm Logs—but cannot find the required license key on the local machine or a connected license server.
. You’ve installed your PowerTags license, the communication is green, and the screens look perfect. But every few minutes, a nagging popup appears: