PLC以梯形圖為主,DCS以模塊功能圖為主。經(jīng)過多年的發(fā)展,國際電工委員會通過IEC1131-3標(biāo)準(zhǔn)規(guī)定了五種編程語言,目前主流的DCS和PLC都表示符合這個(gè)標(biāo)準(zhǔn),支持其中的幾種或全部編程語言。從開發(fā)效率和程序可讀性來考慮,模塊功能圖和順序功能圖越來越成為主要的編程方式,梯形邏輯和結(jié)構(gòu)化文本成為了自定義模塊的開發(fā)工具。大型PLC在組態(tài)方式上越來越像DCS,差距在逐漸縮小,而小型PLC仍然以梯形圖為主。
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