这意味着，手动命令不能令CV值大于正限幅值，小于正限幅值，也不能令CV变化率大于最小回转时间设定的比采样时间和PI块时序PID块是数字化的模拟量控制函数，所以PID输出方程式中的dt采样时间不能设为无穷小。受控的大部分过程可用–次或二次方程近似表示，相当于纯时间滞后。
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