PID块设定一个CV输出给过程，并使用过程反馈回来的PV值来确定Error，以便调节下一次的CV输出值。总计时间是-一个关键的过程参数，这个参数确定PV在多长时间后响应CV的变化。如下面关于设定回环增益部分所讨论的
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