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Overview

The programmable controller has an analog task that executes each type of cyclic process. When enabled, each cyclic process is placed in the execution queue that is managed by the analog task responsible for executing that type of process. The cyclic processes are time-ordered in their individual queues according to when each process is rescheduled for execution, relative to the other cyclic processes within the same queues.

The process with the highest priority (closest to overrunning) is executed first. The process is executed until it is completed or until the time specified for that particular task’s time slice expires. If the executing process is completed before the time slice expires, the process with the next highest priority is executed. If the time slice expires before the process is completed, the process (and the task) is put on hold in its current position.

The programmable controller then advances to the next analog task. When the programmable controller sequences through its operations and returns to an analog task with a cyclic process on hold, the process resumes execution from the hold point, unless a higher priority process was scheduled since the last respective time slice. If a process in a cyclic time slice is not finished executing when it is scheduled to execute again, an overrun flag is set.

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