WINCC画面上OPC tag为什么不刷新？
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西门子论坛中提到如下：
the Tags are only be actualized, if they will be requestet by any
process in WinCC, which process is not relevant.
Graphics Runtime, Alarmlogging, Taglogging, Scripting (Global Action).
You could read all tags for example by a Global Action.
原帖链接
https://support.industry.siemens.com/tf/ww/en/posts/opc-tag-updating-problem-update-tags-on-active-screen-only/143220/?page=0&pageSize=10
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OPC Scout客户端是好用的，WinccFlexible也是好用的，但是就是WinCC不好用，从WinCC 7.3以后出现了这个问题。
原帖链接：
https://support.industry.siemens.com/tf/ww/en/posts/opc-problem-updating-the-value-of-the-tag/163381/?page=0&pageSize=10 -
We talked on OPC server station right now.....
In OPC client station same rules applied
a) when OPC client tag is defined as alarm means you require OPC server must update that tag always as fast as systen can
b) when OPC client tag is defined as taglogging means you require OPC server must update that tag always with lient tag logging interval time defined in it
c) when OPC client tag is defined in a graphic page only means you require OPC server must update that tag with refresh time defined in graphic page
In the other system you can define a different time becausetooptimize network trafic and comunication, Siemens OPC client is not to optimiza comunication but for better performanc.
https://support.industry.siemens.com/tf/ww/en/posts/wincc-opc-client/31871/?page=0&pageSize=10 -
