2000417模块备件使用授权

一些任务是间歇性的，但他们需求知道操作的终状况。这是一种典型的操作。要记住的是，什么构成一个方式?程序是怎样分配使得它满足两个要求?运用ALT指令能处理一种简略的这个/那个的状况。
这种编程方式在很多状况中能够见到。不过经常地，运用都略有不同。在某一场合中，一台机器或许被起动;在另一场合中，一个排气扇或许在循环与排气间转换。不同状况下，问题的初始表现并不能让人想起相同的解决方法。

Some tasks are intermittent, but they need to know the final status of the operation. This is a typical operation. Remember, what constitutes a way? How is the program allocated so that it meets two requirements? Using ALT instruction can deal with a simple situation of this / that.
This programming method can be seen in many situations. But often, the application is slightly different. On a certain occasion, a machine may be started; In another case, an exhaust fan may switch between circulation and exhaust. In different situations, the initial performance of the problem does not remind people of the same solution.