ABB 3BHE030579R0003可设定安全值

结构化文本一般描述

结构化文本是基于文本的编程语言，符合程序处理过程由语句决定所有Control Builder F中的函数与功能块都可以在ST编程中调用功能范围因部分ST算子而失去。功能块可以在ST程序声明之后使用。参数设置类似于梯形图或者功能块图。不同于功能块图(FBD) ，结构化文本的扩展功能，是通过条件语句和循环语句被相应关键字调用而实现的。

程序执行顺序是在ST编辑器(从左到右，从上到下)中实现。

此顺序只能通过插入循环语句来改变。ST编程没有使用范围的限制。加载程序之后，如果连接到过程站，ST 编辑器将以试车模式运行。ST程序运行值会显示出来。

使用ST语言时，允许:

■使用For

■While，Until循环

■向量与矩阵运算。使用ST语言可以:

■复杂算法

■复杂数学计算

■数组，ST语言不可以

■功能块的简单连接

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