Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 572

• Any device used in the argument of the ECALL(P) instruction must not used in the subroutine program. Otherwise, normal
operation cannot be performed.
Ex.
Wrong operation: While D0 is specified for FD0 in the subroutine program, D1 is used in the subroutine program.
[MAIN]
M0
[ABC]
P0 M0
Before the execution of
the subroutine program
D0
0
D1
10
D2 100
D3 1000
(4)
(4)
FD0
(4)
(4)
(1) The operation result of the subroutine program is stored.
(2) These values are replaced with the function device values.
(3) The value of D1 is not replaced with the function device value.
(4) Undefined values are stored.
7 APPLICATION INSTRUCTIONS
570
7.4 Structure Creation Instructions
ECALL
/
Immediately after the execution of
the ECALL instruction
D0
0
D1
10
D2 100
D3 D3 D3 1000
0
10
FD0
100
1000
"ABC" P0 D0
FEND
K100 K3 FD0
+ K100 D1
RET
At the execution of
the subroutine program
D0
0
(1)
D1
110
D2 100
D3 1000
(1)
33
(1)
1
FD0
100
1000
After the execution of
the RET instruction
(2)
D0 D0 D0 D0 D0
33
(3)
D1 D1
110
(2)
D2 D2 100
(2)
D3 D3 1000
(4)
(4)
FD0
(4)
(4)