Mitsubishi Electric MELSEC Q Series User Manual page 322

(b) Standard RAM
The area for standard RAM is created by specifying the memory capacity in the battery backup RAM with
parameters.
As with a standard ROM, it can be accessed from FTP, Telnet and user programs and store files.
Use the following functions in Setting/monitoring tools for the C Controller module to set a memory capacity of
a standard RAM.
•
Project view  "Parameter"  "CCPU Parameter"  <<System settings>>  "Standard RAM
settings"
● A standard RAM is created when the set parameters are applied (power OFFON /reset).
● When the area for standard RAM is created, the memory specified for standard RAM is occupied, therefore, the battery
backup RAM area will be decreased.
[Example] If a 2MB standard RAM is created
● Before modifying the standard RAM setting, it is recommended to backup the standard RAM data. When the standard
RAM setting is modified, the standard RAM area is cleared to 0.
(6) SD memory card
An SD memory card can store parameters and files such as user programs.
Access from FTP, Telnet and user programs is allowed.
For SD memory cards, refer to the following.
Page 103, Section 7.6.1
(7) USB device
A USB device can store files other than user programs.
Access from FTP, Telnet and user programs is allowed.
For USB devices, refer to the following.
Page 106, Section 7.6.3
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5MB (total capacity) - 2MB (standard RAM capacity) = 3MB (available battery backup RAM capacity)