Publication 1756-UM001G-EN-P - January 2007
Develop Applications
81
The interruption of a periodic task increases the elapsed time (clock
time) between the execution of system overhead functions.
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 millisecond.
If the controller only contains periodic tasks, 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
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)
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
10
15
20
25
Elapsed Time (ms)
1 ms
System Overhead
1 ms
Continuous Task
5
10
15
20
25
Elapsed Time (ms)
Periodic Task
System Overhead
5
10
15
20
25
Continuous Task
Elapsed Time (ms)
Содержание controllogix 1756-L55M12
Страница 4: ...Publication 1756 UM001G EN P January 2007 Summary of Changes 4 Notes...
Страница 10: ...Publication 1756 UM001G EN P January 2007 10 Notes...
Страница 20: ...Publication 1756 UM001G EN P January 2007 20 Directly Connect to the Controller via the Serial Port Notes...
Страница 66: ...Publication 1756 UM001G EN P January 2007 66 Place Configure and Monitor I O Modules Notes...
Страница 82: ...Publication 1756 UM001G EN P January 2007 82 Develop Applications Notes...
Страница 122: ...Publication 1756 UM001G EN P January 2007 122 Maintain Nonvolatile Memory Notes...
Страница 130: ...Publication 1756 UM001G EN P January 2007 130 Maintain the Battery Notes...
Страница 134: ...Publication 1756 UM001G EN P January 2007 134 LED Indicators Notes...