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處理速度與用戶程序的長度、CPU處理速度、軟件質(zhì)量等有關(guān)。如今，PLC接點(diǎn)的呼應(yīng)快、速度高，每條二進(jìn)制指令履行時(shí)刻約0.2～0.4Ls，因此能習(xí)慣操控請求高、相應(yīng)請求快的運(yùn)用需求。掃描周期（處理器掃描周期）應(yīng)滿意：小型PLC的掃描時(shí)刻不大于0.5ms/K；大中型PLC的掃描時(shí)刻不大于0.2ms/K。
四、機(jī)型的挑選
    (一)PLC的類型
    PLC按構(gòu)造分為全體型和模塊型兩類，按運(yùn)用環(huán)境分為現(xiàn)場裝置和操控室裝置兩類；按CPU字長分為1位、4位、8位、16位、32位、64位等。從運(yùn)用視點(diǎn)動(dòng)身，通常可按操控功用或輸入輸出點(diǎn)數(shù)選型。 
    全體型PLC的I/O點(diǎn)數(shù)固定，因此用戶挑選的地步較小，用于小型操控體系；模塊型PLC供給多種I/O卡件或插卡，因此用戶可較合理地挑選和裝備操控體系的I/O點(diǎn)數(shù)，功用拓展便利靈敏，通常用于大中型操控體系。
    (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)用請求的共同。例如對輸入模塊，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)用請求。對輸出模塊，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)用請求應(yīng)共同。 

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