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7-123
ECALL(P)
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7.6 Structure creation instructions
7.6.6 Subroutine calls between program files (ECALL(P))
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]
*1: Stores the execution result of the subroutine program.
*2: Replaced by the value of the function device.
(7) The numbers of the devices designated by the arguments in the ECALL(P) instruction
should not overlap. If they do overlap, it will not be possible to obtain accurate calculations.
(8) Up to 16 levels of nesting can be used with the ECALL(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.
(9) Devices which are turned ON within subroutine programs will be latched even if the
subroutine program is not executed. Devices turned ON during the execution of a
subroutine program can be turned OFF by the EFCALL(P) instruction.
[MAIN]
[ABC]
D0
D3
D2
D1
0
Indefinite
Indefinite
Indefinite
Indefinite
1000
100
10
D0
D3
D4
D2
D1
0
1000
100
10
0
1000
100
10
D0
D3
D2
D1
33 *2
Indefinite
Indefinite
Indefinite
Indefinite
1000 *2
100 *2
1 *2
D0
D3
D2
D1
0
1000
100
1 *1
33 *1
1000
100
10
D4 0 0
D4 100D4100 *1
After the execution of
RET instruction
FD0
FD0 FD0 FD0
Immediately after the
execution of ECALL
instruction
Transfer
Transfer
Before the execution
of subroutine program
At the time of
subroutine program
execution
"ABC" P0ECALL
FEND RET RET RET
END
P0
P10
P20
ECALL"DEF" P10 ECALL "GHI" P20