如前页表4-5所述,PID功能块可读取13个用户参数,而使用其余的40字RefArray用于内部PID存贮。–般情况下用户不需进行修改。如果用户在一长时间延迟后在Auto模式下正调用PID模块,可用SVC-REQ#16加装当前PLC逝去时间时钟到%Ref+23去更新上次PID解决(处理)时间以避免积分器上发生多级变化。若已设置超驰低位控制字(%Ref+14)至1,紧接的4位控制字必须设置为控制PID模块输人触点,内部SP和PV必须设置。

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