PID函数的参数块占据了40个字的的存储区域。只有前13个字是可配置的。其余27个字供CPU使用，不可配置。每个PID函数调用必须使用不同的40个字的存储区域，即使所有的13个可配置变量都相同，也不允许两个PID函数使用存储区域。控制块的前13个字必须在PID函数执行前设定数值。大多数的缺省值为0。-旦选择了合.适的PID值，可以将其作为常数在BLKMOV内定义，以便于程序修改。
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