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addVANTAGE Pro 6.4 Administrator Guide CHAPTER 5

The Trend Viewer

autoscaled sensors by assigning each to a group. For example, you could

assign sensor values above a certain point to one group and values below

that point to another group. Groups are entirely arbitrary and of your own

making. Group numbers need not be consecutive.

• If you select the Always show y-axis checkbox, the y-axis for the current

sensor (meaning the sensor whose y-axis properties you are viewing) will

be shown on the grid always, even when another sensor is selected.

Normally, when you select a sensor in the Legend section, the y-Axis is

refreshed and the scale of the selected sensor is shown. However, if you

select the Always show y-axis checkbox, you will see the current sensor’s y-

axis and the y-axis for the sensor you select in the Legend.

•Use the Major Grid to show horizontal lines. The number gives the number

of lines spread over the value range of the sensor and the values between

the lines. To know how many units will be displayed between two major grid

lines, enter a number and press the Tab or Enter key. The line below shows

You will use xx units per gridline, where xx is the number of units.

The xx value depends on the Scale and the number of gridlines used. For

example, if you turn on the major grid for a Temperature sensor, you might

see You will use 6 units per gridline, meaning one gridline might

show 20°C, while the line above it shows 26°C and the line below it shows

14°C.

•The Band High (%)/Low (%) is the percentage of available space for this y-

axis and the trend curve. The default is 0 to 100% (meaning that the grid

will use all available space). Band is helpful for Trends that contain many

similar tags (e.g. Battery voltages=BV). You can say: Use the lower 50%

for BV 1 and the upper 50% for BV 2. The axis and the trend curves would

not overlap, but be drawn in different parts of the grid. The settings for BV

1 would be Low=0, High=50 and the lower half of the grid would display

these voltages. BV 2 would have settings of Low=50, High=100 and the

upper half of the grid would display its voltages.

You can also experiment with these fields in conjunction with the autoscale,

autostack, and overlap features to create a variety of interesting trends.

• The autoscaling feature introduces the ability to show multiple graph lines

that overlap for multiple sensors, causing graphs that can be difficult to

read. Use the Automatic stack and the Overlap percentage features to

display the graph in several different ways that eliminate any such difficulty.

You can select all of the sensors in the Properties dialog and click the

Automatic stack button to stack the values for each sensor on top of each

other. In some instances, however, you might need to show some overlap.

You can still select sensors to autostack but enter a percentage of overlap

to show.

Plots Tab

Following is an explanation of the options on the Plot tab shown in Figure 82.

Figure 82. Trend Properties, Plot Tab

•The Visible checkbox has the same function as the checkbox in the Legend.

If the checkbox is selected, the sensor values appear in the grid. If the

checkbox is not selected, the values do not appear.

• You can use a Line or Bar Style for the values in the grid. The Bar style is

useful for sum values, such as precipitation or data flow.

•Use the Color chooser to change the color of the Line or Bar.

• Select the Line or Bar thickness from the Weight list.

Thresholds Tab

You can define multiple thresholds per tag in a trend. A threshold is an

interesting value (range), where the trend curve “enters” or “leaves” a certain

range. For example, you can set a threshold for when a value is suddenly

outside its usual range (e.g. “only values between 0 and 10°C are valid”) or

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