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MELSOFT
7 MANAGEMENT OF DATA IN THE PLC CPU
POINT
• There are two types of system area: "mandatory" and "user-set."
The mandatory system area is automatically created during formatting, but the
user-set system area is created according to the user's required settings.
• When the user-set system area is created, the data storage area for sequence
programs and other data is reduced.
Check the data capacity before setting the range for the user-set system area.
System files,
temporary files, etc.
Monitor No. 1 for other stations
Monitor No. 15 for other stations
User data storage area
parameters, sequence
programs, device
comments, etc.
Mandatory system area
(fixed at 4K steps)
User-set system area
(selectable: 0 to 15K steps)
System area
QnACPU internal RAM
• Files in the system area cannot be displayed as a data list.
Create the user-set system area in the internal RAM.
• If it is set in an IC memory card, the speed of other station monitoring will not
change.