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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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