July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/ 0750656794-CH031.3D – 315 – [315–323/9]
19.6.2004 9:22PM
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Interrupts
Aninterruptisaninputsignal,whichhaltstheexecutionofthemainprogramandthen
immediatelyjumpstoaninterruptserviceroutine(ISR).
TheISRcarriesoutaspecifictaskandthenreturnsbacktothemainprogram.
However,themaindifferencebetweenaninterruptandasub-routineCALListhat
aninterruptcanoccuratanytimeduringtheexecutionofthemainprogram,whereasa
sub-routineCALLcanonlybecarriedoutwhen,duringthescantimeofthemain
program,theCALLInstructionisexecuted.
Ifitisnecessarytotakeimmediateactionintheeventofaparticularinputsignal
beingoperated,thentheuseofaninterruptshouldbeconsidered.
However,ifimmediateactionwererequiredintheeventofanemergencystop
situati ...
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