Rockwell Automation Publication 1769-UM011H-EN-P - April 2012 111
Develop Applications Chapter 7
At a time slice of 10%, system overhead interrupts the continuous task every 9 ms
of continuous task time.
The interruption of a periodic task increases the elapsed time (clock time)
between the execution of system overhead functions.
V15 and Lower V16 and Higher
Time Slice (SOTS) Comms Continuous Task Comms Continuous Task
10% 1 msec 9 msec 1 msec 9 msec
20% 1 msec 4 msec 1 msec 4 msec
33% 1 msec 2 msec 1 msec 2 msec
50% 1 msec 1 msec 1 msec 1 msec
66% 1 msec 0.5 msec 2 msec 1 msec
80% 1 msec 0.2 msec 4 msec 1 msec
90% 1 msec 0.1 msec 9 msec 1 msec
Legend:
Task executes.
Task is interrupted (suspended).
Periodic
1 ms 1 ms
System Overhead
9 ms 9 ms
Continuous Task
0 5 10 15 20 25
Elapsed Time (ms)
1 ms 1 ms 1 ms 1 ms 1 ms
Periodic Task
1 ms 1 ms
System Overhead
9 ms of Continuous Task Time 9 ms of Continuous Task Time
Continuous Task
0 5 10 15 20 25
Elapsed Time (ms)
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