Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 233

Creating files and folders
Under the "MEMDUMP" folder containing memory dump files, do not create any files or folders using a personal computer or
other device. Doing so may result in deletion of files and folders.
Access to the SD memory card
The SD memory card is so frequently accessed that a delay occurs in completing the access to the SD memory card (read/
write).
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12 DEBUG FUNCTION
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12.1 Memory Dump Function