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電源模塊的選擇

  電源模塊選擇僅對(duì)于模塊式結(jié)構(gòu)的PLC而言，對(duì)于整體式PLC不存在電源的選擇。

電源模塊的選擇主要考慮電源輸出額定電流和電源輸入電壓。電源模塊的輸出額定電流必須大于CPU模塊、I／O模塊和其它特殊模塊等消耗電流的總和，同時(shí)還應(yīng)考慮今后I／O模塊的擴(kuò)展等因素；電源輸入電壓一般根據(jù)現(xiàn)場(chǎng)的實(shí)際需要而定。

對(duì)于小型控制系統(tǒng)或不需要在線編程的系統(tǒng)，一般選用價(jià)格便宜的簡(jiǎn)易編程器。對(duì)于由中、PLC構(gòu)成的復(fù)雜系統(tǒng)或需要在線編程的PLC系統(tǒng)，可以選配功能強(qiáng)、編程方便的智能編程器，但智能編程器價(jià)格較貴。如果有現(xiàn)成的個(gè)人計(jì)算機(jī)，也可以選用PLC的編程軟件，在個(gè)人計(jì)算機(jī)上實(shí)現(xiàn)編程器的功能。

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