Mitsubishi Electric melsec q03ud(E)cpu - Page 62

CHAPTER2 SEQUENCE PROGRAMS
1
2
3
4
5
6
7
8
2.3 Settings When Program is Divided 2.3.3 Stand-by type program
2 - 23
1) Executing a subroutine program and interrupt program in a stand-by type program
After execution of the stand-by type program, the CPU module reexecutes the program that called a program
in the stand-by type program.
Figure 2.26 shows the operation when the subroutine and interrupt programs in the stand-by type program
are executed.
● For restrictions on programming of subroutine and interrupt programs, refer to the following.
• Subroutine program: Section 2.2.2
• Interrupt program: Section 2.3.2
● Use common pointers. ( Section 9.10.2)
If local pointers are used, subroutine programs in a stand-by type program cannot be executed from any other program.
Figure 2.26 Operation when the subroutine and interrupt programs in the stand-by type program are executed
P100 RET
I0 IRET
END processing END processing END processing
CALL P100
instruction execution
Interrupt factor
occurrence

Subroutine program within
a stand-by type program
Interrupt program within a
stand-by type program
Main routine program