Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 93

(3) Program sequence in the CPU module
The following figure shows the program sequence after the CPU module is powered on or its status is changed
from STOP to RUN.
Powered off on/STOP
Initial execution
type program
END processing
Scan execution
type program
Use initial execution type program, stand-by type program, and fixed scan execution type program as required.
RUN
Fixed scan
execution type
program
Stand-by
type program
CHAPTER 2 APPLICATION OF PROGRAMMING
Executed only once when
the CPU module is powered
on or its status is switched
from STOP to RUN.
Executed at specified
time intervals.
Executed only when its
execution is requested.
Program execution sequence
Program execution when any
subroutine program or interrupt
program is called
2
91