Sd Memory Card Replacement - Mitsubishi Electric MELSEC iQ-R Series User Manual

20.12

SD Memory Card Replacement

SD memory cards can be replaced using the SD memory card forced disable function even while data logging is in progress.
Page 147 How to forcibly disable the SD memory card with a special relay
Only the data saving to an SD memory card is stopped while this function is being executed. The data collection keeps
working. (Data collection continues in accordance with the settings registered when data logging is started.)
If SD memory card replacement causes processing overflow, make adjustments by changing the collection
interval, internal buffer capacity, or other settings.
Behavior during SD memory card replacement
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" folder and its subfolders, folder deletion takes time,
possibly resulting in missing data. Ensure that the new SD memory card does not contain a "LOGGING"
folder.
Logging state during SD memory card replacement
SD memory cards can be replaced without depending on the current data logging state. SD memory card replacement results
in the deletion of the LOGGING folder if the data logging state is other than below:
• Stop
• Stop (after collection)
• Stop (after error)
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.
• STOP to RUN state
*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.
20 DATA LOGGING FUNCTION
294
20.12 SD Memory Card Replacement
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.
*1