Mitsubishi MELSEC Q Series Programming Manual page 487

Correct operation example
The following example shows the operation performed when D0 is specified for FD0 in the
subroutine program and D4 is used in the subroutine program.
[Program example]
[Operation performed after subroutine program execution]
Before the execution
of subroutine program
D0 0
D1 10
D2 100
Transfer
D3 1000
D4 0
Indefinite
Indefinite
FD0
Indefinite
Indefinite
*1: Stores the execution result of the subroutine program.
*2: Replaced by the value of the function device.
(8) Up to 16 nesting levels are possible with the CALL(P) instruction. However, this 16 levels is
the total number of levels in the CALL(P), FCALL(P), ECALL(P), EFCALL(P), and XCALL
instructions.
CALL P0
FEND
END
(9) Devices which are turned ON within subroutine programs will be latched even if the
subroutine program is not executed. Devices which are turned ON during the execution of a
subroutine program can be turned OFF by the execution of the FCALL(P) instruction.
Immediately after the
execution of CALL
instruction
D0 0
D1 10
D2 100
D3 1000
D4 0
0
10
FD0 FD0
100
1000
P0
CALL P10
RET
At the time of
subroutine program
execution
D0 0 D0
D1 10 D1
D2 100 D2
D3 1000 D3
Transfer
D4 100 *1 D4
33 *1
1 *1
FD0
100
1000
P10 P20
CALL P20
RET RET
CALL(P)
1
2
3
4
6
6
After the execution
7
of RET instruction
33 *2
1 *2
100 *2
8
1000 *2
100
Indefinite
Indefinite
Indefinite
Indefinite
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