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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
| 參考價(jià) | 面議 |
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更新時(shí)間：2018-05-13 08:13:55瀏覽次數(shù)：369
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IC693ALG222LT---IC693ALG222LT
IC693ALG222LT---IC693ALG222LT
PLC的發(fā)展階段
雖然PLC問世時(shí)間不長，但是隨著微處理器的出現(xiàn)，大規(guī)模，超大規(guī)模集成電路技術(shù)的迅速發(fā)展和數(shù)據(jù)通訊技術(shù)的不斷進(jìn)步，PLC也迅速發(fā)展，其發(fā)展過程大致可分三個(gè)階段：
一. 早期的PLC(60年代末—70年代中期)
早期的PLC一般稱為可編程邏輯控制器。這時(shí)的PLC多少有點(diǎn)繼電器控制裝置的替代物的含義，其主要功能只是執(zhí)行原先由繼電器完成的順序控制，定時(shí)等。它在硬件上以準(zhǔn)計(jì)算機(jī)的形式出現(xiàn)，在I/O接口電路上作了改進(jìn)以適應(yīng)工業(yè)控制現(xiàn)場的要求。裝置中的器件主要采用分立元件和中小規(guī)模集成電路，存儲器采用磁芯存儲器。另外還采取了一些措施，以提高其抗干擾的能力。在軟件編程上，采用廣大電氣工程技術(shù)人員所熟悉的繼電器控制線路的方式—梯形圖。因此，早期的PLC的性能要優(yōu)于繼電器控制裝置，其優(yōu)點(diǎn)包括簡單易懂，便于安裝，體積小，能耗低，有故障指使，能重復(fù)使用等。其中PLC*的編程語言—梯形圖一直沿用至今。
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