點擊圖片查看大圖SIEMENS C98043-A7100-L3-1
根據(jù)PLC所具有的功能不同，可將PLC分為低檔、中檔、三類。
????（1）低檔PLC ?具有邏輯運算、定時、計數(shù)、移位以及自診斷、監(jiān)控等基本功能，還可有少量模擬量輸入／輸出、算術(shù)運算、數(shù)據(jù)傳送和比較、通信等功能。主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統(tǒng)。
????（2）中檔PLC???除具有低檔PLC的功能外，還具有較強的模擬量輸入／輸出、算術(shù)運算、數(shù)據(jù)傳送和比較、數(shù)制轉(zhuǎn)換、遠(yuǎn)程I/O、子程序、通信聯(lián)網(wǎng)等功能。有些還可增設(shè)中斷控制、PID控制等功能，適用于復(fù)雜控制系統(tǒng)。
????（3）PLC???除具有中檔機的功能外，還增加了帶符號算術(shù)運算、矩陣運算、位邏輯運算、平方根運算及其它特殊功能函數(shù)的運算、制表及表格傳送功能等。PLC機具有更強的通信聯(lián)網(wǎng)功能，可用于大規(guī)模過程控制或構(gòu)成分布式網(wǎng)絡(luò)控制系統(tǒng)，實現(xiàn)工廠自動化。
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