3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
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CHAPTER3 SEQUENCE PROGRAM CONFIGURATION
AND EXECUTION CONDITIONS
There are three types of programs that can be executed in the CPU module: sequence
program, SFC program, and ST program.
This manual does not explain the SFC program and ST program.
Refer to the following manuals for the SFC program and ST program.
QCPU (Q Mode)/QnACPU Programming Manual (SFC)
QCPU (Q Mode) Programming Manual (Structured Text)
(1) Program execution order of Basic model QCPU
The Basic model QCPU executes a program in the following order (Figure 3.1).
Figure 3.1 Program execution order of Basic model QCPU
Initial processing
I/O module refresh processing
Program operation processing
END processing