列参数PID函数读取13个参数,并将其余27个字用于数据存储。一般不要更改这27个字的值。如果在经过长时间的延时后调用自动模式的PID函数,你可能需要使用SVC_ _REQ 16或SVC_ REQ 51将当前的CPU逝去时间写入%Ref+23来更新PID的最后一次运行时间以避免积分器出错。如果将覆盖(Override)控制字(%Ref+14)的低位设为1,则控制字的下面4位必须设定为控制PID块输入结点,并且必须设定SP和PV值,因为你已经替代梯形图逻辑对PID块进行控制了。
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