结构化文本函数调用执行一个预先定义的预算，这个运算完成数学，位串或者其他操作。函数调用由函数或程序块名称，以及需要的输入输出参数组成。结构化文本逻辑可以调用程序块和下表所示的PAC系统内置的函数。函数调用必须是单独的一个语句
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