Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

Page: 573 / 2110

7 APPLICATION INSTRUCTIONS
7.4 Structure Creation Instructions
571
7
Ex.
Correct operation: While D0 is specified for FD0 in the subroutine program, D4 is used in the subroutine program.
• The device numbers specified by the ECALL(P) instruction arguments must not be overlapping. If they are overlapping,
normal operation cannot be performed.
• Up to 16 ECALL(P) instructions can be nested. Note that the 16-level nesting is the total of the CALL(P), FCALL(P),
ECALL(P), EFCALL(P), and XCALL instructions.
• Devices which are turned on in the subroutine program are retained even while the subroutine program is not executed.
Devices which are turned on during execution of the subroutine program can be turned off by the EFCALL(P) instruction.
Precautions
• An FBD/LD program cannot be created as a subroutine program.
• FBD/LD does not support the execution of a subroutine program with an argument.
(1) The operation result of the subroutine program is stored.
(2) These values are replaced with the function device values.
(3) Undefined values are stored.
M0 P0
/ K100 K3 FD0
FEND
M0
"ABC" ECALL P0 D0
[MAIN]
[ABC]
+ K100 D4
RET
1000
100
10
0
1000
100
1
33
FD0 FD0 FD0 FD0
1000
100
10
0
1000
100
10
0
1000
100
10
1000
0 0 100 100
100
1
33
D0
D1
D2
D3
D0
D1
D2
0
D0
D1
D2
D3
D0
D1
D2
D3
D0
D1
D2
D3
(2)
(2)
(2)
(2)
(1)
D0 D0 D0
D3
D4 D4 D4 D4 D4 D4 D4 D4
(1)
(1)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
(3)
Before the execution of
the subroutine program Immediately after the execution of
the ECALL instruction At the execution of
the subroutine program After the execution of
the RET instruction
ʺABCʺ P0 ECALL
FEND RET RET RET
END
P0
P10 P20
ECALL ʺDEFʺ P10 ECALL ʺGHIʺ P20