452
OPUS Projektor Manual
Object Reference
The complete value history can be reset (deleted) with the JavaScript
delete2DGraphHistory function.
Displaying the logged data at run time needs some CPU time. To improve performance of the
2D Graph, the object is not redrawn at each variable change but automatically redraws itself
with the latest values in a fixed interval (currently about every second). If there are still
performance issues the following measures can improve it:
·
Reduce the numbers of shown variables in the graph
·
Reduce the number of samples for each variable in the graph (see Number of Samples
to Record )
·
Scale the X axis so that less data points are visible at once
·
Consider changing the Log Trigger for each variable to Time Based with an
appropriate timer value.
·
If all of the above is not feasable for you application, think about upgrading to a newer
device generation with more CPU power
Variable References
Each variable can either be attached via the dialog that pops up when the ... button is
pressed in the property table for property "Variables To Draw" or by dragging a variable
from the Variable View onto the graph in the designer area.
X Axis Time Variable
With a variable attached to this property the time span of the X axis can be scaled. If no
variable is attached, the default time span is 10 seconds.
At run time the scaling is done every time the variable value is changed. The value of the
variable represents the time span of the X axis in seconds.
Variable values less than 1 are not considered.
Default value: None
Possible values: Any integer variable
X Axis Offset Variable
When a variable is attached to this property, it is possible to move in the history of the
graph. For each increment of the variable, the graph will move one second into it's history
and shows "old" values. Values less than 0 are not considered. If the value 0 is set, the
graph shows "live updates" of the values.
Default value: None
Possible values: Any integer variable
Cursor Position Variable
It is possible to move a cursor line in the graph. With this cursor line it is possible show the
values of each variable at the time where the cursor is. The cursor position represents the
distance in pixel from the right side of the 2D Graph.
When a variable is attached to this property the cursor can be activated by setting a value
greater or equal to 0 (0 shows the latest values).
548
456
457
To Next Page
Loading...