Considerations - Mitsubishi Electric MELSEC IQ-R series Reference Manual

12.2

Considerations

The following shows the considerations for file control.
Files such as read programs and parameters
If the files such as program files and parameters which affect the system are read from the CPU module, keep the files for
backup. Do not edit the data in the file on an external device. If the programs or parameters are required to be changed, use
an Engineering tool.
Access for '$MELPRJ$' folder of RCPU
The $MELPRJ$ folder of RCPU is the folder that controls the data written from an Engineering. Do not access the $MELPRJ$
folder other than the purpose of data backup or restoration.
When performing data backup or restoration in the '$MELPRJ$' folder, read/write all the files in the '$MELPRJ$' folder. If only
a part of '$MELPRJ$' folder is changed, it may not operate properly.
If the file is protected
When executing the following command, disable the protection (system protect of CPU module, the protection switch of SD
memory card) of the access target CPU. If the command is executed with the access target protected, the command will be
terminated abnormally.
Function
Create new file (Register file name)
Delete file
Copy file
Modify file attribute
Modify file creation date and time
Write to file
Files that cannot be modified while CPU module is in RUN
The executing file cannot be modified while the CPU module is in RUN.
When data write or delete command is executed to a file being executed, place CPU module in the STOP status. If the
command is executed during RUN, the command completes abnormally.
Page 463 Applicable Commands for Online Program Change
12 FILE CONTROL
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12.2 Considerations
Reference
Page 220 Create new file (command: 1820)
Page 223 Delete file (command: 1822)
Page 226 Copy file (command: 1824)
Page 230 Modify file attribute (command: 1825)
Page 233 Modify file creation date and time (command: 1826)
Page 242 Write to file (command: 1829)