Chapter 5 Program Configuration and Operation Method
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(7) Internal device task program processing
Here describes the processing method of international device task program which extended the task (start
condition) of task program from contact point to device as execution range.
(a) Items to be set in Task
Set the execution condition and priority to the task being executed. Check the task no. for task
management.
(b) Internal device task processing
After completing the scan program execution in CPU module, if the condition that becomes the start
condition of internal device task program is met, according to the priority, it shall be executed.
(c) Precautions in using internal device task program
1) Accordingly, even if the execution condition of internal device task program occurs in Scan Program
or Task Program (Cycle time, I/O), it shall not be executed immediately but executed at the time of
completion of Scan Program.
2) If the demand to execute Internal Device Task Program occurs, the execution condition shall be
examined at the time of completion of Scan Program. Accordingly, if the execution condition of Internal
Device Task occurs by Scan Program or Task Program (Cycle time) during „1 scan‟ and disappears, the
task shall not be executed as it is not possible to detect the execution at the time of examination of
execution condition.
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