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Process Control – Sequentially Controlled Systems


A sequentially controlled system controls a process that is defined as a series of tasks  to be performed—that is, a sequence of operations, one after the other. Each operation  in the sequence is performed either for a certain amount of time, in which case it is  time-driven, or until the task is finished (as indicated by, say, a limit switch), in which  case it is event-driven. A time-driven sequence is open-loop because there is no feedback,  whereas an event-driven task is closed-loop because a feedback signal is required  to specify when the task is finished.
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