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Section 1 Specifications
1-7-3 Example of fixed cycle task operation
Example of the operation of fixed cycle task is used is explained under the following operating conditions.
<Operating conditions>
Task priority: Task 0 > Task 1 > Default task (cyclic)
Task type: Task 0: Fixed cycle task (1ms cycle)
Task 1: Fixed cycle task (3ms cycle)
Default task
Note: The cycle of fixed cycle tasks can be set in 1-ms steps.
<Task operation>
The default tasks run while no fixed cycle task or event task is operating. Be sure to adjust the run times to the start cycles of
upper tasks so that the run times may be reserved for default tasks. (Otherwise, a user WDTUP or upper task may be delayed.)
Tcd
Ted
Tc0
Tc0
Tc0
Tc0
Tc0
Tc0
Te0
Te0
Te0
Te0
Te0
Te0
Te0
Te1
Te1
Tc1
Tc1
1ms
Fixed cycle interrupt by system
: Scan end processing
: Expansion right side unit Data output processing
: User program processing
: Main unit Data input processing
: Expansion right side unit Data input processing
: Main unit Data output processing
Start request
Task 0
Start request
Task 1
Start request
Default
: Task 0 execution time: Required time from the starting of input processing to the end of output processing
: Task 0 execution period: Required time from the starting of input processing to the starting of next input processing
: Task 1 execution time: Required time from the starting of input processing to the end of output processing
: Task 1 execution period: Required time from the starting of input processing to the starting of next input processing
: Default execution time: Required time from the starting of input processing to the end of output processing
: Default execution period: Required time from the starting of input processing to the starting of next input processing
Te0
Tc0
Te1
Tc1
Ted
Tcd
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
