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MELSEC-Q
7 APPLICATION FUNCTIONS
7.5 Starting the Interrupt Sequence Program
This function checks the interrupt conditions at data receiving from other stations using
the interrupt setting parameters of the host. When the interrupt conditions are matched,
it issues an interrupt request to the CPU module from the network module and starts
the interrupt sequence program of the host's CPU.
[Advantages]
1) The startup of the interrupt sequence program of the applicable station
can be instructed from other stations.
2) The number of programming steps is reduced and the scan time is
shortened because the programming for the startup conditions is not
required in the sequence program.
[Visual representation of the function]
POINT
(1) The Basic model QCPU of function version B or later allows the setting of the
interrupt setting parameters.
(2) When multiple interrupt conditions are set, the operation may be delayed if an
interrupt request is issued from other stations at the same time because other
interrupts have to wait to be processed.
(3) When executing the interrupt sequence program, it is necessary to execute
"EI" (Enable Interrupt) with the main routine program.
END
IRET
Interrupt
program
Network module
Interrupt
condition check
Execute an interrupt
when the conditions
are matched.
MELSECNET/H
network
FEND
Main routing
program
CPU module
I50
Have the link devices
(LB/LW/LX) changed?
Has any channel data
been designated?
Channel 3
ABC
SEND
instruction
Has the network status
(SB/SW) changed?
.....
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