Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 597)

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Setting up trends
This chapter describes:
 What trends are.
 How to create trends.
 The parts of a trend.
 Trend chart styles.
 Choosing colors, fonts, lines, and legends for a trend.
 Using shading to compare pens.
 Using overlays to compare real-time and historical data.
 Using trend templates.
 Working with trends at run time.
About trends
A trend is a visual representation, or chart, of current or historical tag values. A trend
provides an operator with a way to track plant activity as it is happening.
In a trend, you can:
 Plot data for as many as 100 tags or expressions.
 Plot data over time, in a standard trend chart.
 Plot one tag against another, in an XY Plot chart.
 Use shading to emphasize a comparison between two pens.
 Display isolated or non-isolated graphs.
In an isolated graph, each pen is placed in a separate band of the chart. In a non-
isolated graph, pen values can overlap.
Charting current versus historical data
A trend can show:
 Real-time data from a data server.
 Historical data from a data log model’s set of files.