编译器错误 C0045

消息

Using ‘THIS’ is not allowed in this context

错误原因

如要分配到实例，THIS 只能用在方法、操作和转换中，或者用在功能块的主体中。所有其他位置也会显示此错误消息。

解决方案

仅将 THIS 用在允许的上下文中。

错误示例

PROGRAM PLC_PRG
VAR
  test1: INT;
END_VAR

THIS^.test1 := 19;

--> C0018: 'THIS^.test1' is not a valid assignment target

--> C0062: 'THIS^' is not a structure variable

--> C0045: Using 'THIS' is not allowed in this context