Panasonic GT01 User Manual page 117

When using the SD memory card.
Data may be erased or the SD memory card may be damaged during the operation. Take measures for
the situations as below.
Problem
Data in SRAM
(Record area for
logging) is lost.
SD memory card is
damaged and data
cannot be read
because SD
memory card was
ejected during save.
SD memory card is
damaged by power
discontinuity due to
power failure and
data cannot be read
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Transmitting GT configuration setting file using the logging function clears the
information on the SRAM.
Save all the data remained in the log before transmission.
When data cannot be saved in the SD memory card, the data beginning with the
chronologically oldest data will be overwritten if the record area for logging is full.
Make the setting of the notice device for the case that the SD card free space is
less than the specified size.
Stop the logging of data.
Eject the SD memory card after turning on the setting for stopping the trigger
occurrence for all logging files in the record area control.
(Activate the setting for stopping the trigger occurrence with switch parts, etc.)
Set not to save in the SD memory card.
Turn on the control device for stopping write to the SD memory card, and then
eject the card.
A UPS (Uninterruptible power source) is used. When using a UPS, the power is
supplied to the PLC and GT both from the UPS, and the signal for logging
stop/file creation is sent to the GT from the PLC using the power failure alarm
signal that is input into the PLC as a trigger. (See figure below.)
Measures