A function terminal requiring an input is unwired. You cannot leave unwired functions on the diagram while you run a VI to try out different algorithms.

一个必的函数线端没有线。不能再程序框图中放置一个未线的函数，若运行VI会造成一个错误的算法。

It is a difficult thing for our student to draw a block digram according to a principle digram,the difficulties are analysed and some good methods are also given in this article.

以一道题为，对绘制框图时的几个难点进行了较深入的分析，给出了克服困难的方法.