Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 144)

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FactoryTalk Historian ProcessBook User Guide
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flat plot area. These default ranges are not applied if the trace in question is on a
single scale trend that contains other visible traces that do not fall into either of the
aforementioned categories.
A single scale trace containing one flat trace with a constant value of 0.
A single scale trend containing a flat trace and a non-flat trace. The
default range for the flat trace is not applied.
Time Scale Grid Lines
Grid lines for the time scale line up with whole units of time, such as days,
hours, minutes, etc. On a trend that receives updates, the grid lines scroll as
time passes. For an updating trend, the current time is indicated by a dotted
vertical line.
Configure labels for the time axis in one of three ways: