150-A360NBD
150-A360NBD
150-A360NBD
施奈德的Unity软件编程可以更好的理解面向对象编程。它的DFB定义中包含输入/输出参数，私有/共有变量，以及代码实现，而这正是计算机的面向对象 编程中“类”的基本元素，而创建类的实例（对象）就像创建普通的“布尔”变量一样，只需在“Function Blocks”中定义这种“类”的变量即可。
Step7和Unity都可以采用面向过程和面向对象编程方式，这两种编程方式的区别类似于计算机高级语言中的C语言和C++语言编程的区别。
以下的讲解将会把Step7中的FB和Unity中的DFB称为“类”，Step7中的FB+背景DB以及Unity中DFB的实例称为“对象”。
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