Rockwell-automation FactoryTalk View Site Edition Users Guide Manual do Utilizador Página 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.
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