284
IRET
Function
(1) Indicates the completion of interrupt program processing.
(2) Returns to sequence program processing following the execution of the IRET instruction.
Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into
SD0.
Program Example
(1) The following program adds 1 to D0 if M0 is ON when the number 3 interrupt is generated.
[Ladder Mode]
[List Mode]
IRET
Recovery from interrupt programs
6.6.2
IRET
Setting
Data
Internal Devices
R, ZR
J \
U \G
Zn
Constants
Other
Bit
Word
Bit
Word
––
––
Error
code
Error details
Q00J/
Q00/
Q01
QnH
QnPH QnPRH
QnU
LCPU
4220
There is no pointer corresponding to the interrupt number.
4221
After an interrupt occurred, the END, FEND, GOEND, or STOP
instruction was executed prior to the IRET instruction.
4223
The IRET instruction was executed before the interrupt program is
executed.
4223
The IRET instruction was executed during the fixed scan execution type
program.
––
––
––
––
Basic
Process
High
performance
Redundant Universal
LCPU
IRET
I
IRET
**
Step
Instruction
Device