描述
PID功能块中包括PV-SP的运算。有的PID功能块没有SP和PV的减法运算,这是为了在PID之前还可以加入其它运算。如加死区。在功能块库中另外一个重要功能块是站功能块,它不能用数学公式表示输入和输出的直接关系,它是实现人机交流的功能块,把由人决定的设定值送给控制回路,并送进控制回路何时接入的条件和实现手/自动切换的条件等。
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