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  (二)輸入輸出模塊的挑選
    輸入輸出模塊的挑選應(yīng)思考與運(yùn)用請(qǐng)求的共同。例如對(duì)輸入模塊，應(yīng)思考信號(hào)電平、信號(hào)傳輸間隔、信號(hào)阻隔、信號(hào)供電辦法等運(yùn)用請(qǐng)求。對(duì)輸出模塊，應(yīng)思考選用的輸出模塊類型，通常繼電器輸出模塊具有報(bào)價(jià)低、運(yùn)用電壓規(guī)劃廣、壽數(shù)短、呼應(yīng)時(shí)刻較長等特色；可控硅輸出模塊適用于開關(guān)頻頻，電理性低功率因數(shù)負(fù)荷場合，但報(bào)價(jià)較貴，過載才干較差。輸出模塊還有直流輸出、溝通輸出和模仿量輸出等，與運(yùn)用請(qǐng)求應(yīng)共同。 
    可依據(jù)運(yùn)用請(qǐng)求，合理選用智能型輸入輸出模塊，以便行進(jìn)操控水平緩下降運(yùn)用本錢。 
    思考是不是需求拓展機(jī)架或長途I/O機(jī)架等。 
    (三)電源的挑選
    PLC的供電電源，除了引進(jìn)設(shè)備時(shí)一起引進(jìn)PLC應(yīng)依據(jù)商品闡明書請(qǐng)求規(guī)劃和選用外，通常PLC的供電電源應(yīng)規(guī)劃選用220VAC電源，與國內(nèi)電網(wǎng)電壓共同。首要的運(yùn)用場合，應(yīng)選用不間斷電源或穩(wěn)壓電源供電。 
    假如PLC自身帶有可運(yùn)用電源時(shí)，應(yīng)核對(duì)供給的電流是不是滿意運(yùn)用請(qǐng)求，不然應(yīng)規(guī)劃外接供電電源。為防止外部高壓電源因誤操作而引進(jìn)PLC，對(duì)輸入和輸出信號(hào)的阻隔是必要的，有時(shí)也可選用簡略的二極管或熔絲管阻隔。 
    (四)存儲(chǔ)器的挑選 
    因?yàn)楹怂銠C(jī)集成芯片技能的開展，存儲(chǔ)器的報(bào)價(jià)已下降，因此，為保證運(yùn)用項(xiàng)意圖正常投運(yùn)，通常請(qǐng)求PLC的存儲(chǔ)器容量，按256個(gè)I/O點(diǎn)至少選8K存儲(chǔ)器挑選。需求雜亂操控功用時(shí)，應(yīng)挑選容量更大，層次更高的存儲(chǔ)器。 

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