最后，PID块会检查输出的极性(配置字%Ref+12的第2位)，如果此位置1,改变输出值的符号。CV=PID正限幅输出或者.PID负限幅输出如果输出极性位被设定如果PID块为自动模式，最后的CV值存放在手动命令字%Ref+13中。如果PID块为手动模式,CV值由手动命令设定，但是所有的比率和限幅值仍然起作用。
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