Rockwell Automation FactoryTalk Historian SE ActiveView 3.2 User Guide - Manual (Page 15)

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For End Users: Viewing FactoryTalk Historian Data with FactoryTalk Historian ActiveView
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Trends are plots of point data over time. A Value is a numeric value for a
particular point in the Historian Server. A value may or may not include a
tag (point name) and a time stamp. Bars are used to show values
graphically as a percentage of a rectangle.