This error appears when your project uses data logging or alarming features, but the required license is missing, invalid, or inaccessible. Here are the most common triggers:
解决方法：
Navigate to . Check if historical alarm archiving is active. While basic historical alarm views on physical Comfort Panels do not require an option license, running an alarm archive on a PC-based WinCC Runtime Advanced station does.
: A license installed on a USB drive but not properly transferred to the computer's hard drive using the Automation License Manager (ALM) will not be recognized during runtime. This error appears when your project uses data
If you own a Compact license, Siemens offers upgrade licenses (often with "UP" in the part number) at a reduced price over buying new.
Below is a comprehensive guide to understanding, troubleshooting, and resolving this licensing issue. Why This Error Occurs
If you already own the license but it shows a or doesn't work: While basic historical alarm views on physical Comfort
If your production site requires active data trending, long-term historical alarms, or regulatory compliance archives, you must obtain and activate the license.
The "License key not available" message for WinCC Logging for Runtime Advanced
If the Runtime was active on an Industrial PC (IPC) and the power failed or the computer was shut down improperly, the license key can become "defective," showing a red symbol in the Automation License Manager . If it is missing
Which licenses currently show up as inside your Automation License Manager?
If your logging license version is older than your installed Runtime software, you must purchase an upgrade license from Siemens.
When the Runtime engine detects these logging functions during startup or operation, it checks the Automation License Manager (ALM) for the logging authorization. If it is missing, invalid, or mismatched, the system triggers the warning. Step-by-Step Troubleshooting Guide Follow these steps to diagnose and fix the issue. 1. Check Your Active Logs in TIA Portal
Open your project in TIA Portal and navigate to Historical data .