采样时间和 PID 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一次或二次方程近似表示，相当于纯 时间滞后。PID 块设定一个 CV 输出给过程

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