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在中斷輸入點非屏蔽時，只要中斷輸入點接通即產(chǎn)生中斷響應；在該點屏蔽時，待解除屏蔽時再響應中斷。
（2）計數(shù)中斷模式
對中斷輸入點進行高速計數(shù)，當達到設定次數(shù)時產(chǎn)生中斷，且停止計數(shù)。計數(shù)范圍0~65535、1KHz。
計數(shù)器的設定值和（當前值-1）存放在指定的通道中。
1746-NO4IAB模塊
PLC控制系統(tǒng)產(chǎn)生I/O滯后現(xiàn)象的 主要原因如下：
（1） 由于PLC采用循環(huán)掃描的工作方式。PLC只在每個掃描周期的I/O刷新階段集中輸入/輸出，導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。
濾波器時間常數(shù)越大，對輸入信號的延遲作用越強。
有的PLC其輸入電路濾波器的時間常數(shù)可以調(diào)整。
（3） 輸出繼電器的動作延遲（繼電器輸出型PLC）。
從輸出鎖存器ON、到輸出觸點ON經(jīng)歷一定時間——輸出ON延時。
要求有較快響應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。
要求快速響應的場合，需要解決I/O速度問題。
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