Allen-Bradley 1738-ADNX Manual do Utilizador descarregar pdf (Página 82)

Publication 1768-UM001C-EN-P - November 2007

82 Develop Applications

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.

If you use the default time slice of 20%, the system overhead interrupts the

continuous task every 4 ms.

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)

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 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 131 132

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