Specifications

App - 70
Appendix 8 Outline of Interrupt Sequence Program Startup
The Q series have a function to start the interrupt sequence program of the host's CPU
by issuing an interrupt request to the CPU module from the network module when the
interrupt conditions are satisfied.
The A maximum of 16 interrupt conditions can be set for each network module.
(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)
This function checks the interrupt conditions at data receiving from other
stations using the interrupt setting parameters of the host.
END
IR E T
Interrupt program
Network module
Interrupt
condition check
Executeaninterruptwhen
the conditions are satisfied.
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
SEND
instruction
ABC
Has the network status
(SB/SW) changed?
POINT
• 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.
• When executing the interrupt sequence program, it is necessary to execute "EI"
(Enable Interrupt) with the main program.