User guide

addVANTAGE Pro 6.2 User Guide CHAPTER 4

The Trend Viewer

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.

Plots Tab

Following is an explanation of the options on the Plot tab shown in Figure 37.

Figure 37. 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

when a certain value is met (e.g. “when value drops below 0°C”). Figure 38

illustrates the Thresholds tab.

 CAUTION Do not confuse this feature with the threshold settings in the tag itself.

With addVANTAGE Pro 6.2, each tag, independent from the trend, can have

thresholds. When the tag’s thresholds are met, normally an action is performed.