除非过程非常快，否则不需要将采样时间设为0,从而每个扫描周期都进行PID运算。如果很多PID回路使用了大于扫描周期的采样时间，那麼在有很多PID环同时完成计算时，CPU的扫描时间会有很大的变化。解决的办法是将控制PID块运行的位排在一-个数列内
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