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MELSEC-Q
10 DEVICES
10.10 Interrupt Pointers (I)
(1) Definition
(a) Interrupt pointers are used as labels at the beginning of interrupt programs.
Interrupt pointer (interrupt program label)
Interrupt program
IRET
I
(b) A total of 256 interrupt points (I0 to I255) can be used (total for all programs
being executed).
(2) Interrupt pointer No. & interrupt factor
(a) As shown below, there are four types of interrupt factor.
• QI60/A1SI61 factor .............Interrupt input from the QI60/A1SI61
interruption module.
• Sequence start generator ...Interruption input from special function
module factor modules which can dictate an interrupt start to
the High Performance model QCPU (QI60,
A1SI61 excluded).
• Internal time factor ..............Fixed scan interruption by High Performance
model QCPU's internal timer.
• Error interruption .................Interruption by an error that does not stop
sequence program operation.
• Intelligent function ...............Interruption by an intelligent function module.
module interrupt
1
REMARK
1: To use the intelligent function module interrupt, the intelligent function module
setting (interrupt points setting) is required at the "PLC system" tab screen in the
“(PLC) Parameter" dialog box.
(For the interrupts from the intelligent function module, see Section 8.2.1.)
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