Mitsubishi Electric FX5 User Manual page 144

Operation during SD memory card replacement
Mounting the replaced SD memory card on the CPU module causes a "LOGGING" folder to be created. When becoming
ready for running the logging function, the CPU module resumes the data transfer into the SD memory card.
The CPU module operates differently as follows depending on the folder configuration in the replaced SD memory card.
Folder constitution
The folder not exist.
Only LOGGING folder
Only LOGGING_OLD folder
LOGGING folder
LOGGING_OLD folder
Precautions
If the internal buffer becomes full during the time between SD memory card replacement and the resumption of data writes to
the SD memory card, processing overflow occurs resulting in missing data.
Storage file numbers after SD memory card replacement
The numbering of the first storage file created after SD memory card replacement differs depending on the storage file
switching condition, as described in the following table.
Storage file switching condition
Overwrite
Stop
If the new SD memory card contains a "LOGGING" and "LOGGING_OLD" folder, data logging cannot be
executed. Ensure that the new SD memory card does not contain a "LOGGING" and "LOGGING_OLD" folder.
Logging state during SD memory card replacement
SD memory cards can be replaced without depending on the current data logging state.
Operations during SD memory card replacement
If one of the following operations is performed during the time between the removal and installation of SD memory cards, any
data collected during that time will not be stored in the new SD memory card.
*1
• Stop and run
*1
• Power off and on
*1
• Reset
• Suspend data logging
• Stop data logging
*1 An error is generated if data logging was previously running based on the setting file contained in the replaced SD memory card.
Operations after SD memory card replacement
If the SD memory card was replaced while data logging was running based on the data logging setting file contained in the SD
memory card, the data logging setting file contained in the new SD memory card is used when data logging is started next. If
the new SD memory card does not contain the data logging setting file, data logging is not started.
Stack file remaining in the replaced SD memory card
Replacing an SD memory card that contains a stack file may result in the stack file remaining in the replaced SD memory card
along with storage files. If the stack file is remaining in the replaced SD memory card, recover the latest data contained in the
stack file by doing the following:
• Retrieve the data from the stack file and combine the data with a storage file.
• Save the stack file as a storage file.
19 DATA LOGGING FUNCTION
142
19.12 Other Functions
Storage file numbers after SD memory card replacement
Numbering continues from the number of the last storage file contained in the replaced SD memory card.
Numbering begins at 00000001.
Operation of after SD memory card replacement
LOGGING folder is made.
• LOGGING folder is renamed by LOGGING_OLD.
• LOGGING folder is made.
LOGGING folder is made.
Data logging state changes to error state.