● Online values
● Data from files
● Data read from the device
Trend chart for digital values
Digital values can be shown in a trend chart.
The representation of the values depends on the device description.
Additional information
● Section "Charts and trends (depends on device) (Page 189)"
● Section "Displaying process variables and measured values (Page 190)"
● IEC 61804-2
● IEC 61804-3
7.9.2 Trend chart
The following may be displayed in the trend charts:
● Display of several trends
● Display of one x axis and several y axes
● Display of one y axis with several trends
The way in which trends are displayed is derived from the device description:
● Trend colors
● Visual highlighting of individual trends (e.g. line width)
y-t chart
In y-t charts, the trends are updated incrementally.
The following display modes are usually used:
● Automatic scrolling along the time axis.
● If the trends have reached the right-hand margin, they continue to be recorded starting from
the left again, and the old trends are overwritten one after the other.
● If the trends have reached the right-hand margin, the trend display is cleared and the trends
start again from the left.
Functions
7.9 Graphical displays
Help for SIMATIC PDM (V8.2)
142 Operating Manual, 02/2014, A5E33203676-AA
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