If you have programmed one of the three HMI FBs in your program, do not call the same FB again in a program section with a different priority class, since the FB must not interrupt itself.

• 如果你已经在你的程序中编程了三个HMI功能块中的一个，你就不能再在另外一个程序段中使用其他的优先级调用相同的功能块，因为功能块本身不能中断。