8/2/2019 Time-Controlled Interrupts With the S7-22x
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Notes:
l Interrupts are processed by the CPU in the order of their
occurrence and according to theirpriority status. There can only
ever be one program active for interrupt processing. If aninterrupt
program is being processed then that program is terminated first.
It cannot beinterrupted by a subsequently occurring interrupt
program, not even if this has a higher priority.
If an interrupt occurs while another interrupt is being
processed, then the later interrupt is putinto a queue for
processing later. A maximum number of 8 interrupts can be put into
the timedinterrupt queue.
l It might happen that more interrupts occur than can be entered
in the queue. In this case thesystem has queue overflow flags that
specify the type of interrupt events that could not beincluded in
the queue. The table shows the special flags that are set when
there is queueoverflow. You may only use these bits, SM 4.0 to 4.2,
in an interrupt program, because they willbe reset when the queue
has been processed and main program processing continues.
You will find more information in the S7-22x System Manual under
Entry ID 1109582.
Keywords:program configuration
interrupt programEVENT=Number of theinterrupt event
Terminate subroutine RET
Start interrupt program INT 0
Now you can write the programthat you want to processevery 100
ms
....... .... ....
Terminate the interrupt program RETI
Queue Special flag
Queue overflow for communications interrupts SM 4.0
Queue overflow for I/O interrupts SM 4.1
Queue overflow for time-controlled interrupts SM 4.2
Entry ID:8803785 Date:2001-09-25
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