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IRET
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6.6 Program Execution Control Instructions
6.6.2 Recovery from interrupt programs (IRET)
6.6.2 Recovery from interrupt programs (IRET)
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.
• There is no pointer corresponding to the interrupt number. (Error code: 4220)
• The IRET instruction was executed before the interrupt program is executed.
(Error code: 4223)
• The END, FEND, GOEND, or STOP instruction has been executed after the generation of
an interrupt and prior to the execution of the IRET instruction. (Error code: 4221)
• The IRET instruction was executed during the fixed scan execution type program.
(For the Universal model QCPU only) (Error code: 4223)
Setting
Data
Internal Devices
R, ZR
J\
U\G
Zn Constants Other
Bit Word Bit Word
–– ––
Basic
Process
High
performance
Redundant
Universal
IRET
I
IRET
**