Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 248)

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FactoryTalk Historian ProcessBook User Guide
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AF attributes AF Attributes represent data that is associated with an element. They
can contain configuration information for the element, or measured or
calculated process data that provides the information necessary for
getting and setting its value to and from a data stream. Conceptually,
an AF Attribute replaces the FactoryTalk Historian Aliases and
FactoryTalk Historian Properties formerly used in the FactoryTalk
Historian module Database.
AF Attributes are children of AF Elements. A key component of an AF
Attribute is its context path. You can change a context path to allow
data from multiple elements to be viewed in the same context. See AF
2010 User's Guide for more information about FactoryTalk Historian
AF.
AF elements AF Elements are the building blocks of AF (like modules in MDB) and
can represent either physical or logical entities in your process, such
as a physical device, piece of equipment, storage container, or
representative section of a process.
In the larger picture, you can think of the functions different types of data
perform. In FactoryTalk Historian ProcessBook, you work with different
types of data:
Time series data FactoryTalk Historian server data is collected and stored in the form
of points, each of which represents a time-series data stream from a
particular source, such as a temperature or pressure sensor. A tag is a
reference name for a FactoryTalk Historian point.
Calculated data Statistical calculations provide another way to view time series data.
Averages, High and Low values and measures of variance all provide
critical information about data events over a period of time.