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How to do polling programming for 4 pumps?

2009-03-14View Original

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There are 4 pumps on site. The programming requirement is as follows: the pumps should be started in a round-robin manner based on time, and once the scheduled time arrives, the pump with the shortest cumulative operating time should be selected to continue running (if the operating times are identical, a random selection is made). If one of the running pumps fails, the other 3 pumps with the shortest cumulative operating time will be started automatically

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