Panasonic GTWIN Reference Manual page 175

Menus
Save setting tab
A CSV file with the characters "TRG" (see "Log File and CSV File Structure" on
p. 171) will be recorded when the conditions for this dialog are met and logging
data has accumulated.
Field
Saving to SD Card
Enable Overwriting of Logging
Files
Create POW file
Logging device tab
174
Description
Specify a device to trigger writing logging files to the SD memory card.
Specify the maximum number of files allowed before they are overwritten.
Activate to create a CSV file with the characters "POW" (see "Log File and CSV
File Structure" on p. 171).
GTWIN Reference Manual