The XCx Multi-Tasking System
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Operating Manual XCx 300 / 500 / 540 Version 09/08
8.2.4
Default task
The default task runs as a background task with the lowest possible
user priority and is not time-monitored. It is activated when all higher-
priority user tasks have been processed. The default task is
configured so that it uses some of the available residual time (max. 80
%) but is executed no more than one every 20 ms.
Only one default task is permitted in each resource.
All drivers in the I/O configuration that are not
explicitly assigned to a user task automatically
activate the default task and are executed in the
context of the default task.