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MELSEC-Q
6 HIGH PERFORMANCE MODEL QCPU FILES
PRECAUTIONS
1) The program capacity displayed during programming with GX Developer is the
sum of file header and executed program capacities and does not include the
capacity of steps secured for write during RUN.
2) Since a file is stored on the program memory in 1k step units, the program
capacity displayed during programming with GX Developer may differ from the
capacity of the program file on the High Performance model QCPU.
(Example) The capacity of a program whose executed program part has 491
steps is displayed on GX Developer as shown below. (File header is
fixed at 34 steps)
Executed program
File header
491 steps
34 steps
Display on GX Developer:
34 steps + 491 steps = 525 steps
Status of File on GX Developer
However, when the above program is written to the High Performance model
QCPU, it occupies 2k steps on the High Performance model QCPU. The reason
is as shown below.
Steps secured for
write during RUN
File header
Executed program
34 steps
500 steps
491 steps
Simple addition of the above elements results in
34 steps + 491 steps + 500 steps = 1025 steps.
However, since a file is stored on the program
memory in 1k step (1024 steps) units,
the program occupies 2k steps (1024 steps = 2048 steps)
on the High Performance model QCPU.
File header
Steps secured for
write during RUN
Executed program
2k steps are occupied.
Status of File on High Performance model QCPU
Содержание QCPU (Q Mode)
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