Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 141)

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Visualize Data with Symbols
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FactoryTalk Historian ProcessBook uses an algorithm to identify the peaks
and valleys of data values so that no information is lost when the trend
time range is large. It ensures that the plot is not under- or over-sampled
and that the correct amount of information is sent from the FactoryTalk
Historian Archive.
Unlike data from a FactoryTalk Historian Archive, data from an ODBC
data set refreshes according to a configured refresh rate.
Trend Appearance
A trend appears according to the format established in the Preference
settings (page 30). You may override this format by selecting the Trend
Formatting (page 112) button .
Typically, the title of the trend appears at the upper left, and the current
time stamp appears at the upper right. The selected tag names, current or
end value, and engineering units appear in the legend opposite the value
scale.
Grid Lines and Labels
Trends are formatted according to certain defaults. Use the Trend
Elements (page 32) tab in the ProcessBook Preferences dialog box to
create default formats for new trends. You can set options like line colors
and marker shapes, and set the types of point information included with a
trend.
Grid Lines
Horizontal and vertical grid lines align with even units (whole numbers) on
the scales. Grid lines for the value scale line up with whole numbers at
intervals of 1, 2, 5, 10, or powers of 10 times those intervals. Grid lines for
the time scale line up with time intervals such as weeks, days, hours,
minutes, etc. The traces then scroll as time passes on an updating trend.