Mitsubishi Electric MELSEC iQ-R Series User Manual page 118

Process cpu module

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Table of Contents

Operation upon occurrence of an interrupt factor

The following shows the operation when an interrupt factor occurs.

■If an interrupt factor occurs during link refresh

The link refresh is suspended and the interrupt program is executed. Even though the station-based block data assurance is

enabled for cyclic data during refresh of such links as CC-Link IE Field Network, if the interrupt program uses a device

specified as the refresh target, the station-based block data assurance for cyclic data is not available.

Interrupt factor

Execution of the interrupt

Execution of link refresh

(1) The link refresh is suspended and the interrupt program is executed.

■If an interrupt factor occurs during the waiting time after END processing in constant scan

The interrupt program for the interrupt factor is executed.

■If another interrupt occurs while the interrupt program is being executed

If an interrupt such as a fixed scan execution type program (including an interrupt which triggers the event execution type

program) is triggered while an interrupt program is being executed, the program operates in accordance with the interrupt

priority. ( Page 129 Interrupt priority)

■If multiple interrupt factors occur simultaneously while the interrupt is enabled

The interrupt programs are executed in the order of priority. If multiple interrupts with the same interrupt priority occur

simultaneously, the interrupt programs are executed in the order of interrupt priority. ( Page 132 Multiple interrupt

execution sequence)

Main routine program

Interrupt program (I50)

Interrupt program (I100)

Interrupt program (I150)

8 RUNNING A PROGRAM

8.7 Interrupt Program

Interrupt enabled (EI)

Simultaneous occurrence of multiple

interrupt factors

be processed

Waiting to be processed

Troubleshooting