Rockwell Automation FactoryTalk Historian SE ActiveView 3.2 User Guide - Manual (Page 42)

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FactoryTalk Historian ActiveView User Guide
34
Expiration of Displays
There are two kinds of caching of the PDI files.
 Both HTML and PDI displays are cached when downloaded from a
website to the local machine. This is managed in part by Internet
Explorer and the files are stored as temporary internet files, also called
browser cache. This type of file expires exactly 24 hours from the time
it is loaded.
 FactoryTalk Historian ActiveView caches the last 5 displays within its
memory. Once a display is downloaded, the ActiveView Control uses
it without further downloading, unless the display has expired. This
allows for fast loading of the display if you switch to a different
display and then switch back. These files drop off the last five list as
other files are used.
Data updates to cached files occur dynamically through FactoryTalk
Historian. It is not necessary to refresh the display to receive data updates.
You must reload a display to receive content updates. For example, you
will not see a new symbol that is added to a display that is already in your
cache until you clear the cache so that ActiveView can reload it the next
time you view the display.
To remove a file from the cache in Internet Explorer:
1. Click Tools > Internet options > General tab > Temporary Internet
Files.
2. Click Delete Files.
3. Click OK.
You can change the default for expiration of displays within FactoryTalk
Historian ActiveView by setting the PDI time (PDITTL) to a live value.
You must be using the HTTP protocol when you set the DisplayURL (page
62) property of the control. The new setting applies to displays that are
added to the cache after the setting is changed.