对应于函数块输入参数的成员变量不能从函数块外部进行读写(比IEC61131-3的要求更加严格)。对应于函数块输出参数的成员变量能从函数块外部读取可以为具有基本类型的内部成员变量赋初值。同样的初始值适用于函数块实例。给定初始值后，在第一-次转换到运行状态时，内部成员变量值设为0.嵌套实例的内部成员变量值由函数块类型定义赋初值。运行模式存储时，初始值不存储。初始值只在停止模式存储时起作用。
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