这只是通过Web方式访问CPU，与上位机是没有关系的
可看看以下帮助说明

Display classes of the messages
The selected message display classes are subsequently displayed on the CPU web pages.

You can reduce the memory occupied by the web SDBs by selecting only those display classes which are actually required.

The display class is set in the CPU properties "Message attributes" under "System diagnostics" in the inspector window.