Hi,

On a WinCC Unified Panel, logging is always performed in files using SQLite. You can use JavaScript to export the data to CSV files. A snippet can be found in the context menu of the editor via "Snippets > HMI Runtime > Tag Logging > Export Tag Log as CSV".

In the runtime settings, you configure the storage medium and folder for the main database. In the case of tag logging, this database file is named HMI_RT_1_TagLoggingDatabase.db3. In Engineering, you specify a name, a storage medium - which must be the same as for the main database - and a path for each tag log. In the specified path there is a subdirectory called HMI_RT_1_TLGxxx, where xxx is an internal ID. The segment files are stored in this directory. Information about configured tags, tag log names and segments is stored in the main database.

Kind regards
Stefan

Hi,

The LoggedTags method used addresses a single tag, and the Read method returns a single LoggedTagResult object. The CreateLoggedTagSet method can address an array of logged tags and returns an array of LoggedTagResult objects.

It would be possible to modify the code snippet to use a tag set, but you would have to be aware of some limitations. Since each logged tag might change at a different time, it would not be possible to create a CSV file listing all the tag values for the logged timestamps. At the very least, it would take a lot of effort to do so.

Kind regards
Stefan