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如果采样周期太大，积分计算将会产生很大的误差。以下图为例，误差等于绿色的给定值减去红色的过程变量。图中灰色的面积是各区间误差积分的增量值。注意积分是有正负的。举一个比较***的例子，如果采样周期约等于过程变量衰减振荡的半周期，并且在误差近似为0的点作PID运算，在各采样点计算出的积分增量近似为0，比例部分和微分部分也近似为0，PID的输出值基本上保持不变！
当然实际的PID控制不会这样巧，但是当采样周期过大时，计算出来的积分分量和微分分量会有很大的误差。这样的PID控制当然会失控，怎么调节PID的参数都没有用了。
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