描述
控制的一个控制回路和串级控制回路的方框图如图一，图二所示，图三和图四是Infi90的组态图。含PV-SP的PID功能块是实现过程变量（PV）和设定值（SP）之差进行比例-积分-微分运算，它的参数有设定、过程变量、比例-积分-微分的系数。它的输出通常送到输出板的端子板的地址。后把输出送给阀门。
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