Mitsubishi Q00JCPU User Manual page 240

5
MEMORIES AND FILES HANDLED BY CPU MODULE
5
5.4 File Operation by GX Developer and Handling Precautions
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5.4.4 File size units
(b) Memory capacity calculation
The memory capacity is calculated on the basis of the file size unit of the write
target CPU module. (
The file size unit of the Q25HCPU in this example is 512 steps/2048 bytes
according to (1) in this section.
1) Calculation of parameter file capacity
Although the parameter file capacity is 564bytes, the file occupies a capacity
of 512 steps/2048 bytes since it is stored on the program memory in file size
unit.
Parameter
file
Diagram 5.41 Capacity occupied by file stored in file size unit (Parameter file)
2) Calculation of program capacity
The program capacity is the sequence program capacity + allocate memory
for online program change
In this example, it is 525 steps + 500 steps = 1025 steps. However, the file
occupies a capacity of 1536 steps/6144 bytes since it is stored on the program
memory in file size unit (512-step unit for the Q25HCPU in this example).
Sequence
program
Allocate
memory for
online program
change
Diagram 5.42 Capacity occupied by file stored in file size unit (Program file)
(1) in this section)
<On program memory>
Parameter
564 bytes
file
<On program memory>
Sequence
525 steps
program
Allocate
memory for
500 steps
online program
change
2048 bytes
(512 steps) are
occupied.
1536 steps
(6144 bytes) are
occupied.