Mitsubishi Electric MELSEC iQ-R Series - Interrupt Program

8 RUNNING A PROGRAM
8.7 Interrupt Program
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8.7 Interrupt Program
A program from an interrupt pointer (I) through the IRET instruction.
*1 Only one interrupt program can be created with a single interrupt pointer number.
*2 The interrupt pointers are not required to be defined in an ascending order.
When an interrupt factor occurs, the interrupt program corresponding to its interrupt pointer number is executed. ( Page
488 The priority for the interrupt pointer numbers and interrupt factors) However, before that, interrupt must be enabled by
using the EI instruction.
Making a program a standby type allows it to be managed as a separate program. ( Page 111 Standby
type program)
(1) The end of the main routine program
I0: Interrupt factor for I0
I29: Interrupt factor for I29
FEND
EI
IRET
IRET
END
I0
I29
(1)
Main routine program
Interrupt program (I0)
Interrupt program (I29)
Interrupt pointer
*1*2
IRET
IRET
I0
I29
Main routine program
Interrupt program (I0)
Interrupt program (I29)
Execution
Execution Execution Execution
Execution
Time