History Trend - Panasonic HMWIN User Manual

X Labels
Y Labels
Title
Curve x
Scaling can be applied to the Tag values. To apply scaling, use the X Forms attached to dialog.
You can set the Minimum or Maximum of the curves. You can also attach a Tag to these minimum and
maximum properties. This enhances the ability to change the min and max dynamically in the Runtime.
Also you can modify the properties, such as colors, update time, number of samples, etc. of the Trend
curves through the property view.

16.2 History Trend

If you want to analyze the data at a later time, the Trend data will need to be stored. For this purpose you
use History Trend. When you select History Trend, you can store the data information with reference to time.
The first step in creating a History Trend is to create a Trend Buffer.
The purpose of the trend buffer is to save a sequence of values of a specified Tag in order to record the
state of the tag while time changes. Once values are stored in the buffer, a dedicated widget, called History
Trend viewer, can be used to display the curve in a graphical format.
The History Trend viewer is available in the widget gallery.
In the History Trend widget the start time of the Trend window will be the current time and stop time will be
the current time + duration of the window.
The plot starts from the left end of the Trend window as in the figure below. The graph will be automatically
refreshed during a certain interval of time, until the stop time. When the curve reaches the stop time, the
graph will scroll left and the update of the curve will continue until it again reaches the right side of the
viewer. At that moment a new scroll is automatically done and the process repeats.
Automatic refresh is an option available starting from version 1.80.
NOTE
Figure 156
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HMWIN Studio User Manual
Number of Labels in the X-axis scale
Number of Labels in the Y-axis scale.
Trend title and font properties (font size, label, etc.)
Tag or ì Trend buffer that will be plotted into the trend window.
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