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Troubleshooting
When using an 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.
Error
Data in RAM (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.
5-6
Solution
Transmitting GT configuration setting file using the logging function clears
the information on the RAM. 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.)
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