ABB 3BHE029154P4开关动作消息

1.常量声明表明一个标识符在ST程序中代表一个特定的值

2.所有常量都在CONST...END_CONST模块中声明

3.该常量只在本ST程序中有效

4.常量表达式不能包含任何变量或者函数调用，但可以包括已经定义过的常量

5.常量表达式的值在代码生成时被计算出来

6.常量可以用在表达式中，也可以用作定义数组的上下限

7.常量的数据类型在它被使用时定义

8.常量在没有定义其数据类型之前采用默认的数据类型

9.整型常量在程序执行过程中总是用作DINT类型值

10.当在程序中需要不同的数据类型时，必须插入显示类型改变

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