While PLC logic control, data operations, data comparison, data transmission through the process of combining organic and not only control the traffic light changes, as well as the time display.
同时将PLC的逻辑控制、数据运算、数据比较、数据传送通过程序有机的结合起来，既控制交通灯的变化，还有时间显示。
There is no logic in wasting resources and time on operations that do not have a direct and tangible function.
浪费资源和时间在没有直接和实体功能的运上面，是没有逻辑的。
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