Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 255)

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Data Streams
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Data from a FactoryTalk Historian System
Most displays include a number of FactoryTalk Historian tags from one or
more FactoryTalk Historian systems. The connection to a FactoryTalk
Historian server allows you to view process data at the current time or at
other, discrete points in time. Displays update dynamically whenever
values on the FactoryTalk Historian server change.
FactoryTalk Historian Data Archive
The FactoryTalk Historian Archive is a time-series database that collects,
stores, and retrieves numerical and string data. The FactoryTalk Historian
Archive resides on a host computer and is connected to FactoryTalk
Historian ProcessBook through the FactoryTalk Historian server and your
network.
When you open a display (page 11) containing dynamic symbols,
FactoryTalk Historian ProcessBook retrieves data from the FactoryTalk
Historian Archive.
FactoryTalk Historian ProcessBook also notifies the FactoryTalk Historian
server that it would like to receive data whenever the readings for the
dynamic symbols change. Each time a reading changes for points in the
display, the information is recorded in the FactoryTalk Historian server.
This new information is sent to your displays and all the new values are
added to trend traces. This is true even if you reduce the display to an icon
(page 74).
Updates to FactoryTalk Historian Data
When a display is opened, current values of FactoryTalk Historian tags
(page 231) are used for dynamic elements other than trends and XY plots.
For trends and XY plots, the time scale is configurable on a plot-by-plot
basis. See Changing the Time Range (page 202) for information on
viewing historical values.