PLC（可編程序控制器）是近幾十年來發展起來的一種新型工業控制器，由於它編程靈活，功能，應用廣泛比繼電器係統的控制簡單，使用方便，抗幹擾力強，性價比高，工作壽命高，而其本身具有體積小，重量輕，耗電省等特點。繼電器係統有明顯的缺點：體積大，可靠性低，工作壽命短，查找故障困難，特別是由於它是靠硬連線邏輯構成係統，所以接線復雜，對於生產工藝的變化的適應性差，不便實現集中控制；而PLC的安裝和現場接線簡便，可以應用其內部的軟繼電器簡化繼電器係統的繁雜中間環節，實現軟接線邏輯構成係統，方便集中控制，除此之外，PLC還具有自診斷、故障報警、故障報警種類顯示及網絡通訊功能，便於操作和維修人員檢查。
【瑞士ABB.. 機器人 DSQC係列,ABB Advant OCS,ABB Procontic PLC CPU】
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