是的,以上程序需要在DB块中建立变量。在FB功能块中有输入和输出参数,在DB块中定义这些参数,在主程序中调用FB时将其传递给FB。以下是一个示例DB块:DATABASE AnalogConversionDBVERSION : INT := 1; // 版本号// 定义输入参数结构体STRUCT AI : INT; // 模拟量通道IW数值 LOWER_LIMIT : REAL; // 工程量下限 UPPER_LIMIT : REAL; // 工程量上限END_STRUCT; // 命名为IN_PARA// 定义输出参数结构体STRUCT AO : REAL; // 浮点数工程量END_STRUCT; // 命名为OUT_PARA// 定义DB块变量VAR IN_PARA : IN_PARA; // 输入参数变量 OUT_PARA : OUT_PARA; // 输出参数变量END_VAREND_DBJust like in the FB code, the input and output parameters are defined as structures. In this example, they are named \"IN_PARA\" and \"OUT_PARA\". You can modify the variable names to match your own naming convention. Once you have defined the variables in the DB block, you can call the FB in your main program and pass the input and output variables as parameters.