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Industrial Automation
Program configuration
The programmer divides the program into tasks (sometimes called pages or segments),
which may be executed each with a different period.
The programmer assigns each task (each page) an execution period.
Since the execution time of each block in a task is fixed, the execution time is fixed.
Event-driven operations are encapsulated into blocks, e.g. for transmitting messages.
If the execution time of these tasks cannot be bound, they are executed in background.
The periodic execution always has the highest priority.
56/100 2.3 Programmable Logic Controllers