Allen-Bradley 1769 - Page 112

112 Rockwell Automation Publication 1769-UM011H-EN-P - April 2012
Chapter 7 Develop Applications
If you use the default time slice of 20%, the system overhead interrupts the
continuous task every 4 ms.
If you increase the time slice to 50%, the system overhead interrupts the
continuous task every 1 ms.
If the controller contains only a periodic task(s), the system overhead time slice
value has no effect. System overhead runs whenever a periodic task is not
running.
1 ms 1 ms 1 ms 1 ms 1 ms
System Overhead
4 ms 4 ms 4 ms 4 ms 4 ms
Continuous Task
5 10152025
Elapsed Time (ms)
1 ms
System Overhead
1 ms
Continuous Task
5 10152025
Elapsed Time (ms)
Periodic Task
System Overhead
5 10152025
Continuous Task
Elapsed Time (ms)