函数块输出不能作为结果传给根据变量或者根据数值结果的输入参数。这个限制阻止对函数块输出的修改。函数块内部成员变量的使用函数块可以有任意数量的内部成员变量。内部成员变量不作为输入输出参数。内部成员变量不能和函数块定义的参数同名。

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