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Chapter 6
Historical Data Logging and Extraction
6-16
© National Instruments Corporation
 
The HTV displays the trends for the Powder, Mixer, Liquid and 
Product tags. The Available Data display shows the start and stop 
timestamps of the logged data. The status of the HTV is displayed on 
top of the Historical Trend. You can see it change from Accessing Disk 
to Running. The legend to the right of the Historical Trend shows the 
tag names and the plot colors, as they appear on the trend and in the 
scales.
3.
View the first five minutes in the data set by clicking on the first scroll 
button in the set below the Historical Trend. The beginning of the data 
is centered in the display.
4.
Scroll through the data set using the other buttons below the 
Historical Trend.
5.
The scales to the left of the Historical Trend show the minimum and 
maximum of the Mixer and Powder tags. To view the scales for the 
other tags, click on one of the scales. You can see the color and tag 
name in the display above the scale change. As you click, it rotates 
through the list of tags displayed in the HTV.
6.
To zoom in on the data, select the magnifying glass from the palette, 
and click and drag over a section of the trend.