Mitsubishi Electric MELSEC iQ-R-R04CPU - Data Memory; Function Memory; Refresh Memory; CPU Buffer Memory

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3 MEMORY CONFIGURATION OF THE CPU MODULE
3.1 Memory Configuration
Data memory
This memory is used to store the parameter file, device comment file, and/or the user's folder/file. Data such as the parameter
file and the device comment files written by the engineering tool is stored in the "$MELPRJ$" folder. The "$MELPRJ$" folder
is created after memory initialization. Note that the "$MELPRJ$" folder cannot be deleted. (Folders under the "$MELPRJ$"
folder can be deleted.)
For details on how to create and delete user folders, refer to the following.
 GX Works3 Operating Manual
Function memory
This memory is temporarily used for the specific function.
The following is the function that uses the function memory.
Also, data can be deleted or transferred to the data memory by using the special relay. ( Page 814 Drive information)
Refresh memory
This memory is used to store data used to refresh communication with the intelligent function module. ( Page 359
Refresh Data Register (RD))
CPU buffer memory
This memory is used by the Ethernet function or in data communication between multiple CPUs. ( Page 891 Buffer
Memory)
Function Reference
Data logging function (when "CPU built-in memory (function memory)" is selected for "Data storage destination
memory")
Page 170 DATA LOGGING FUNCTION
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$MELPRJ$
Parameter filesRoot directory
Any folder
Any folder
Any file
Any file