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This instruction will inform the PLC to resume
the normal processing of all Interrupt triggers that have been suspended by using the Interrupt
Suspend Instruction If interrupt events occur while the interrupts
were suspended, they get queued into a pending list based upon the order of priority. This list shows that order of priority. So, if you have this option unchecked and
trigger this instruction all pending interrupts will process first based upon this list. Now if do check this box, all pending interrupts
that are currently in the pending cue will be cleared and only interrupts from that point
on will be processed. This instruction will be used in conjunction
with the INT Suspend instruction in order to block out a section of ladder logic that
you don’t want interrupted by the interrupt events. This Helps ensure that data being accessed
from different places don’t overwrite one another. In normal ladder execution, this data coherency
is rarely an issue, but with interrupts it is not only possible, but likely, and can
cause some and highly frustrating problems.