Mitsubishi Electric MELSEC iQ-R Series - Page 573

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
/K100K3FD0
FEND
M0
"ABC"ECALL P0 D0
[MAIN]
[ABC]
+K100D4
RET
1000
100
10
0
1000
100
1
33
FD0
FD0 FD0FD0
1000
100
10
0
1000
100
10
0
1000
100
10
1000
00100100
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)
D0D0D0
D3
D4 D4 D4D4D4D4 D4D4
(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 P0ECALL
FEND RET RET RET
END
P0
P10 P20
ECALL ʺDEFʺ P10 ECALL ʺGHIʺ P20