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addVANTAGE Pro 6.4 Administrator Guide CHAPTER 5

The Trend Viewer

display, click the OK button. The Trend viewer displays the tags and their data in

a graphic form.

Figure 81. Selecting, Adding, and Removing Tags

Note: If no plots are displayed, check the date and use the arrows and the calendar in

the Trend viewer to move to a date and time where you have data.

You can also use the extensive features available in the Trend Options dialog to

customize the way your graph looks by viewing and changing the options on the

Y-axis, Plots, Thresholds, and Display tabs. As you make changes in this dialog,

you can click Apply to see how the changes affect the Trend before you save the

changes. If you’re satisfied with the changes, click OK to save the Trend.

Y-axis Tab

Following is an explanation of the options on the Y-axis tab shown in Figure 81.

• Use sensor color as Axis color. The Y-Axis and sensor colors are assigned by

addVANTAGE Pro and are identical by default. If you leave this checkbox

unselected, you can use the color chooser you see to change the y-axis

color, but the corresponding color of the tag on the graph will not change. If

you select this checkbox, the color of the y-axis will be the same as the

sensor color (as displayed on the Plot tab).

• Scale

• High /Low: The scale refers to the tag’s value range—in other words,

the maximum or minimum value that is expected. If the tag can

deliver data only in the range of

-60°C to +40°C, for example, you need not enter +1000°C for the

High and -200°C for the Low because no one would see the trend

curve.

Normally, only people who know that their value is within a certain

range use the Scale fields. For example, say you have a special Temp

sensor in a production process. Its range is always between 20°C and

25°C but it is very important to see small changes. For this sensor, you

would choose settings of Low=20 and High=25.

•The Defaults button resets the High/Low settings to the tag’s default.

• If you select the Autoscale checkbox, the minimum and maximum values of

the sensor will be determined automatically within the current time range.

The Scale High and Low fields are ignored in this case.

•Use Automatic scale in group to display the scale as an average of the highs

and lows for the tags in a trend. You can display multiple groups of such

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Adcon A720 Guía de usuario Pagina 66