Panasonic GTWIN Reference Manual page 171

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NOTICE
Loss of data
To prevent data from being inadvertently lost or deleted from the SD
memory card, take appropriate precautionary measures.

Downloading the GT configuration from the PC to GT will erase the
SRAM. Make sure all logging information is saved beforehand.

If you do not want data to be overwritten in the SRAM logging area
when the SD memory card is full, set up a device to send
notification when the SD memory card has little space left (see p.
35).

Eject the SD memory card only if no data is being written to it, e.g.
by using Stop Writing Control (see p. 35).

In case of a power failure, stop logging data and creating logging
files on time by using an appropriate device.
Create Logging Files
Open the "List of Logging Files" dialog via the Start Editor menu (see p. 131).
Press [Log File Setup] to set up log files (see p. 173).
Press [Control Setup] to call up the "Control Setup for Data Logging" dialog, if you wish to
control certain processes with a PLC (see p. 176).
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GTWIN Reference Manual