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Bar Graphs, Me ters and Trends
Chapter 12 - Bar Graphs, Meters and Trends
This chapter focuses on three special graphic objects, which can be used to display PLC data registers. You read in
Chapter 6 how to use shapes and bitmaps to represent the data in PLC registers as states. You also read how to use
alphanumeric data fields to display the contents of PLC registers as either numbers or ASCII characters. We now
introduce three more options to display the data in PLC registers:
Bar Graph Objects
Cre ating Bar Graphs
The Bar Graph Object is used to represent the data in a 16-bit or 32-bit PLC register as a bar graph. You can
configure the bar graph to move up, down, right, or left. The bar graph can be configured with any base number
that represents 0 level and any span range. You can create the bar graph with an alarm low and high setting to
indicate to the OIT operator that an underflow/overflow alarm condition exists. In addition, you can set the alarm
low and high limits to be controlled by two additional PLC registers so that the low and high limits are variable. Bar
graphs can even be constructed with a shape or bitmap overlaying the bar graph to create flow tanks, temperature
gauges, etc.
To create a Bar Graph Object
1. From the Objects menu, click Bar Graph. Or click the Bar Graph icon in the Part2 toolbar.
The New Bar Graph Object dialog box appears.
2. Use the Description: box to enter a title for the Bar Graph part. A description is not necessary
but does help you identify the purpose of the part.
3. In the Read address frame, select the device type from the drop down menu, and then indicate
the PLC register address. Select the data format.
Trend Display Objects
Meter Display Objects
246
1010-1007W, Rev 06
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