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（1） 由于PLC采用循環(huán)掃描的工作方式。
PLC只在每個(gè)掃描周期的I/O刷新階段集中輸入/輸出，導(dǎo)致輸出信號相對輸入信號滯后。
（2） 輸入濾波器對信號的延遲作用。
濾波器時(shí)間常數(shù)越大，對輸入信號的延遲作用越強(qiáng)。
有的PLC其輸入電路濾波器的時(shí)間常數(shù)可以調(diào)整。
（3） 輸出繼電器的動(dòng)作延遲（繼電器輸出型PLC）。
從輸出鎖存器ON、到輸出觸點(diǎn)ON經(jīng)歷一定時(shí)間——輸出ON延時(shí)。
要求有較快響應(yīng)的場合盡量不要使用繼電器輸出型PLC。
（4） 用戶程序的長短及語句編排。
I/O滯后現(xiàn)象，對慢速控制系統(tǒng)影響不大。
要求快速響應(yīng)的場合，需要解決I/O速度問題。
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