Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 165
Program the Redundant Controller Chapter 7
System Overhead Time Slice Examples
This diagram illustrates a system where the System Overhead Time Slice is set to
20% (default). With this percentage, communication is serviced after every 4 ms
of continuous task execution. Communication is serviced for up to 1 ms before
the continuous task is restarted.
Figure 48 - System Overhead Time Slice Set to 20%
This diagram illustrates a system where the System Overhead Time Slic is set to
33%. With this percentage, communication is serviced after every 2 ms of
continuous task execution. Communication is serviced for up to 1 ms before the
continuous task is restarted.
Figure 49 - System Overhead Time Slice Set to 33%
Legend:
Task executes.
Task is interrupted (suspended).
1 ms 1 ms 1 ms 1 ms 1 ms
Service Communication
4 ms 4 ms 4 ms 4 ms 4 ms
Continuous Task
1 ms 1 ms 1 ms 1 ms 1 ms 1 ms 1 ms 1 ms
Service Communication
2 ms 2 ms 2 ms 2 ms 2 ms 2 ms 2 ms 2 ms 2 ms
Continuous Task
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