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A20B-0003-0742
A20B-0003-0742

掃描周期是PLC的一個重要指標，小型PLC的掃描周期一般為十幾毫秒到幾十毫秒。PLC的掃描周期長短取決于掃描速度和用戶程序的長短。
毫秒級的掃描時間對于一般工業(yè)設備通常是允許的，PLC對輸入的短暫滯后也是允許的。但對某些I/O快速響應的設備，則應采取相應的處理措施。如選擇高速CPU，提高掃描速度；選擇快速響應模塊、高速計數模塊以及不同的中斷處理等措施減少滯后時間。
對于用戶來說，要提高編程能力，盡可能優(yōu)化程序；而在編寫大型設備的控制程序時，盡量減少程序長度，選擇分支或跳步程序等，都可以減少用戶程序執(zhí)行時間。

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