1、中文文獻(xiàn)PLC 在冰蓄冷中央空調(diào)系統(tǒng)控制中的應(yīng)用1 引言 在 PLC 被開發(fā)出來的三十年里，它經(jīng)過不斷地發(fā)展，已經(jīng)能結(jié)合模擬 I/O，網(wǎng)絡(luò)通信以及采用新的編程標(biāo)準(zhǔn)如 IEC 61131-3。然而，工程師們只需利用數(shù)字 I/O 和少量的模擬I/O 數(shù)以及簡單的編程技巧就可開發(fā)出 80%的工業(yè)應(yīng)用. PLC 已經(jīng)廣泛的應(yīng)用在所有的工業(yè)部門。據(jù)“美國市場信息”的世界 PLC 以及軟件市場報告稱，1995 年全球 PLC 及其軟件的市場經(jīng)濟(jì)規(guī)模約 50 億美元5。隨著電子技術(shù)和計算機(jī)技術(shù)的發(fā)展，PLC 的功能得到大大的增強(qiáng)由于采用傳統(tǒng)的工具可以解決 80%的工業(yè)應(yīng)用，這樣就強(qiáng)。

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