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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. The following
table shows the three queues for interrupts andthe maximum number
of interrupts that can be put into each 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 S7-21x System Manual under
Entry ID 1109154.
Keywords:program configuration
Using the "system flag SM 0.1that assigns a fixed 1", set
theinterval for the time-controlledsection to 100 * 1ms = 100
ms
LDMOVB
SM 0.1100,SMB 34
Enable all interrupts ENI
Assign time-controlled interrupt "0"
to the interrupt program "0"
ATCH INT,EVENT
INT=Number of theinterrupt programEVENT=Number of theinterrupt
event
0,10
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 CPU210 CPU212 CPU214 CPU215 CPU216
Time-controlled interrupts None 2 4 8 8
Queue Special flag
Queue overflow for communications interrupts SM 4.0Queue
overflow for I/O interrupts SM 4.1
Queue overflow for time-controlled interrupts SM 4.2
Entry ID:299027 Date:2001-09-24
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