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.

必需连接的函数接线端没有连线。不能再程序框图中放未连线的函数，若运VI会造成错误的算法。

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.

以道题为例，对绘制框图时的几难点进深入的分析，给出克服困难的方法.