可靠性高PLC的MTBF一般在40000~50000h以上,西門子、ABB、松下等微小型PLC可達(dá)10萬h以上,而且均有完善的自診斷功能,判斷故障迅速,便于維護(hù)。2、模塊化組合靈活可編程控制器是系列化產(chǎn)品,通常采用模塊結(jié)構(gòu)來完成不同的任務(wù)組合。I/O從8~8192點(diǎn),有多種機(jī)型、多種功能模板可靈活組合,結(jié)構(gòu)形式也是多樣的。3、功能強(qiáng)PLC應(yīng)用微電子技術(shù)和微計算機(jī),簡單型式都具有邏輯、定時、計數(shù)等順序控制功能?;拘褪皆偌由夏MI/O、基本算術(shù)運(yùn)算、通信能力等。復(fù)雜型式除了具有基本型式的功能外,還具有擴(kuò)展的計算能力、多級終端機(jī)制、智能I/O、PID調(diào)節(jié)、過程監(jiān)視、網(wǎng)絡(luò)通信能力、遠(yuǎn)程I/O、多處理器和高速數(shù)據(jù)處理能力。
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