Mitsubishi Electric Q01UCPU User Manual page 86

(c) When multiple interrupt factors occur simultaneously in the interrupt program
execution enabled status
The interrupt programs are executed in the order of interrupt pointers (I ) with high priority.
( Page 409, Section 4.11.1)
Other interrupt programs have to wait until processing of the interrupt program being executed is completed.
Main routine
program
Interrupt
High
program (I50)
Interrupt
program (I100)
Interrupt
Low
program (I150)
(d) When the same interrupt factor as that of the interrupt program being executed
occurs
When the same interrupt factor as that of the interrupt program being executed occurs more than one time
before completion of interrupt program processing, the interrupt factors of I0 to I15, I45, and I50 to I255 are
stored only once, and then the interrupt program corresponding to each stored interrupt factor is executed after
completion of current interrupt program execution.
The interrupt factors of I28 to I31 and fixed scan execution type programs are all stored, and then all the
interrupt programs corresponding to interrupt factors are executed after completion of current interrupt program
execution.
(e) When an interrupt factor occurs during link refresh
The link refresh is suspended and an interrupt program is executed.
Even if the Block data assurance per station setting is enabled in the CC-Link IE or MELSECNET/H network,
this setting does not work when a device set as a refresh target is used in the interrupt program.
In the interrupt program, do not use any refresh target device.
Interrupt factor
Interrupt program
Link refresh execution
For the Block data assurance per station setting, refer to the following.
Manual for each network module
84
Interrupt
enabled (EI)
10ms
execution
Simultaneous occurrence of
multiple interrupt factors
I50 I100
I150
Execution
IRET
Execution
Wait to be
IRET
processed
Wait to be processed
10ms 10ms
Link refresh is suspended and
interrupt program is executed.
Execution
IRET
10ms