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(2) Calculation example of memory capacity
The following shows an calculation example of memory capacity when the parameters and sequence program
are written to the program memory.
(a) Conditions
1) CPU module to be written: Q26UDHCPU
2) Writing file
File name
PARAM.QPA (parameter file)
MAIN.QPG (sequence program)
*1: For the file size, refer to (1)(a) in this section.
*2: This indicates the program size (file header + execution program) displayed on the GX Developer screen.
(
Section 5.2)
3) Reserved area for online change: 500 steps/2000 bytes
(b) Memory capacity calculation
The memory capacity is calculated in units of file sizes of the CPU module to be written.
The file size unit of the Q26UDHCPU in this example is 1 step/4 bytes.(
1) Calculation of parameter file size
Since the parameter file size is 464 bytes, 116 steps/464 bytes is occupied in the program memory.
Parameter file
(464 bytes)
This file is stored in
units of file sizes
(1 step/4 bytes).
Figure 5.27 Occupation in units of the file size (parameter file)
CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
Table5.11 File sizes
<In program memory>
Program memory
capacity
*1
File size
464 bytes
*2
525 steps/2100 bytes
(1) in this section)
4 bytes
4 bytes
The parameter file
occupies 464 bytes
(116 steps).
4 bytes
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