C output refresh period When the scan after the end of user program, PLC enters the output refresh phase.

当扫描用户程序结束后，PLC就进入输出刷新阶段。

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In addition, you can set an interval offset, which further randomizes the refresh period to any value between 0 and 1,440 minutes (24 hours).

而且，你可以设置一个时间间隔偏差，其取值为0到1,440分钟(24小时)，可使刷新周期更随机。

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If no message exists, the operation does not wait around for one; it simply prepares another refresh Response with a new refresh interval period and returns that back to the caller.

如果符合条件的消息不存在，操作并不会等待消息的出现。它只是简单地用一个新的刷新间隔周期来组装一个刷新响应并将它返回给调用者。

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The National Highway Transportation Safety Administration says while sleep is the best cure, drinking two cups of coffee, followed by a 15-to-20-minute nap, can refresh some drivers for a short period of time.

WSJ: Drowsy driving remains an elusive highway dilemma