2090-CFBM7DF-CEAF20

2090-CFBM7DF-CEAF20PLC與業(yè)控制計(jì)算機(jī)(IPC)和集散控制系統(tǒng)(DCS)的比較
    1、各自技術(shù)發(fā)展的起源
    計(jì)算機(jī)是為了滿足快速大量數(shù)據(jù)處理要求的設(shè)備。硬件結(jié)構(gòu)方面，總線標(biāo)準(zhǔn)化程度高，兼容性強(qiáng)，軟件資源豐富，特別是有實(shí)時(shí)操作系統(tǒng)的支持，故對(duì)要求快速、實(shí)時(shí)性強(qiáng)、模型復(fù)雜和計(jì)算作量大的業(yè)對(duì)象的控制占有優(yōu)勢(shì)。
    　　集散系統(tǒng)從業(yè)自動(dòng)化儀表控制系統(tǒng)發(fā)展到以業(yè)控制計(jì)算機(jī)為中心的集散系統(tǒng)，所以其在模擬量處理、回路調(diào)節(jié)方面具有定優(yōu)勢(shì)，初期主要用在連續(xù)過(guò)程控制，側(cè)重回路調(diào)節(jié)功能。
    　　PLC是由繼電器邏輯系統(tǒng)發(fā)展而來(lái)，主要用在離散制造、序控制，初期主要是代替繼電器控制系統(tǒng)，側(cè)重于開(kāi)關(guān)量順序控制方面。
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