How can I update a single parcel in multi graphic of xy trace?

Hi all

I'm working on a 'before' HMI for a larger acquisition/analysis system, which includes monitoring the continuous performance of a turbine. The results of the measurements are stored arrays of contour lines, which represents the openings of turbine efficiency and guide of pallets. This analysis is all running in the background. In the GUI, performance data are loaded from file when the specific report' is requested and is plotted in a XY Chart. I would like to indicate the current operation of the machine using a pitch which is a single point. So a position of this point among the contour lines indicates the current performance of the turbine. This point is updated once per second, while performance data remain the same for considerable amounts of time between recalculations (days or weeks).

Is it possible to update the value from a single source in a conspiracy of several XY graph without having to redraw all parcels?

I tried to use the 'Active Plot' property, which does not work.

My current solution is to keep all the input data to the execution of the while loop and replace a subset of table plot, but which of course requires the entire rewrite whenever the plot of operating point is updated.

You can't redraw a single parcel. If you want to update a single parcel, you must keep all parcels in a shift that and replace the desired field data. However, your problem seems much simpler than that. To display a single point on a ground almost static, you have several options.

  1. You can use a cursor that is controlled by program (the style can be a point, do not allow to drag).
  2. You can use annotations.
  3. You can use the "plot images" feature which allows you to use the picture controls to draw anything on top a chart.

None of these ideas need a refresh of the data.

I think that the idea of cursor is probably the easiest and most appropriate. Just use a node of property with the following properties:

  • active cursor
  • cursor x position
  • cursor position y

Tags: NI Software

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