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更新时间：2013-03-18 13:45:21
PLC
ntroduction of Programmable controllers From a simple heritage, these remarkable systems have evolved to not only replace electromechanical devices, but to solve an ever-increasing array of control problems in both process and reprocessed industries. By all indications, these microprocessor powered giants will continue to break new ground in the automated factory in the 1990s.