功能表图

本文根据Petri网的设计思想，采用功能表图构造数学模型，在模型的基础上进行自动化立体库中输送控制系统的PLC编程设计。

In the light of the design thoughts in the Petri Net , we create the maths model adopting Function Chart , and on the basis of the model , we begin to design PLC program of complicated control system .

采用功能表图编程的程序设计原则

The Program Design Principle by Using SFC

GB/T6988.6-1993控制系统功能表图的绘制

Preparation of function charts for control systems

功能表图的组成元素有工步及动作、有向连线、转换及转换条件等。

The function diagram forming elements are working steps and motion , there are direction connecting , change and change condition etc.

功能表图的结构形式有单行序列、选择序列、并行序列、混合序列等，它取决于实际系统的控制要求和特点。

The function diagram construction form are monomial series , select series , paralleling series , mixed series etc , it is decided on actual system control requirement and characteristic .

步进顺序控制是可编程序控制器的优势功能，编制步进顺序控制程序的有效方法是画出功能表图。

The advantage function in PLC is stepping sequence control , the efficiency method of establishment the stepping sequence control program is drawing out the function diagram .