3-6
Section 3 System Definition
3-3-2 CPU memory size definition
Set the size of the internal data memory of the main unit.
Although the whole size of the user memory area cannot be changed, you can change the size of individual area as needed.
The size can be changed in units of 64 words.
<Individual memory size changing range>
The size of user memory area can be changed in the range shown in the following tables. However, the total value of user
memory areas is fixed.
Main unit with 14/24 points
Memory type
Minimum value
Initial value
Maximum value
Standard memory (non-retain memory)
(%MW1) 4K words
4K words
20K words
Retain memory
(%MW3) 0K word
2K words
16K words
User FB instance memory
0K word
4K words
7.5K words
System FB instance memory
0K word
5.5K words
16K words
Memory type
Minimum value
Initial value
Maximum value
Standard memory (non-retain memory)
(%MW1) 4K words
8K words
40K words
Retain memory
(%MW3) 0K word
4K words
36K words
User FB instance memory
0K word
8K words
16.5K words
System FB instance memory
0K word
11K words
36K words
Main unit with 32/40/60 points
<Setting procedure>
Click the [Memory allocation setting] button on the
“Resource setting of MICREX-SX” dialog box.
The “Memory allocation
setting” dialog box opens.
* When the sizes of the retain memory, user FB memory and system FB memory are set, the remaining size becomes the size
of non-retain memory.
After setting all necessary items, click the [OK] button.
*
Set the area reserved for additional
variables used for rewriting a program
during PLC operation (Patch POU).
Select whether variables
are to be added using
the reserved area when
rewriting a program
during PLC operation
(Patch POU).
