函数块的所有输入参数和他们对应的实例数据元素可以被函数块的逻辑读取。通过变量或数据结果传到函数块的输入参数可以被函数块逻辑更改。通过数值传到函数块的输入参数不能被函数块逻辑更改。注意，对通过数值传到函数块的输入参数的更改的限制不适用于其它类型的块。函数块的所有输出参数可以被块内逻辑修改。
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