PLC中输出滞后输入的浅析

Brief Analysis on the Lag Phenomenon of PLC Input/Output Response

可编程控制器(PLC)是一种新型的通用自动控制装置,具有功能强、使用灵活、可靠性高、环境适应性好、编程简单等优点,但其缺点是:工作速度较计算机慢,输出对输入的响应有滞后现象;因此,在设计PLC控制系统时,分析和研究PLC输入/输出响应的滞后原因非常重要。

Programmable Logic Controller （PLC） is a sort of auto-control device which is sophisticated and all-purpose. It provides better functions, flexibility, reliability, robustness and convenience of programming. However, the disadvantages are： it is slower than computer and there is a lag phenomenon from input to output; So it is very important that the lag phenomenon of the PLC Input/Output response being analyzed and understood when the PLC eontrol system is designed.