how to adjust number of shown plots on waveform charts

[newbieeng]

hi all,

I am trying to adjust number of shown plots on a waveform chart by use of property node but I could not succeed it. Is it possible to do it? I was only able to adjust the number of shown legends of the waveform chart.

[newbieeng]

I added a printscreen to express the situation clearly. I wish I could have succedded...

[P@Anand]

If you have 2011 version of LabVIEW or later you have option that comes with the chart. You can enable/disable the plots using a check box.

[newbieeng]

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P@Anand wrote:

If you have 2011 version of LabVIEW or later you have option that comes with the chart. You can enable/disable the plots using a check box.

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I am using Labview 2009 professional version. Isnt it possible to do it in 2009 version?

[JarleEkanger]

Like P@Anand said. I tried this just to be sure, and there seems to the limitation that Plot 0 (the first plot in the input array) can not be hidden by unchecking the plot visibility checkbox. 

How: Property node: 

Two "solutions": Legend > "Plot visibilty checkbox visible"; set to true.

1. Make an empty plot and use it as the first (zeroth) plot.

2. Expand the property node, set Plot 0 as active plot, wire a boolean control to the Plot.Visibility property.

[newbieeng]

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@JarleEkanger wrote:

Like P@Anand said. I tried this just to be sure, and there seems to the limitation that Plot 0 (the first plot in the input array) can not be hidden by unchecking the plot visibility checkbox. 

How: Property node: 

Two "solutions": Legend > "Plot visibilty checkbox visible"; set to true.

1. Make an empty plot and use it as the first (zeroth) plot.

2. Expand the property node, set Plot 0 as active plot, wire a boolean control to the Plot.Visibility property.

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I have not check the property node "Legend > Plot visibilty checkbox visible" yet because I have not Labview at home. Does Labview 2009 have that property node you mentioned?

[altenbach]

If your version does not have the visibility checkbox, you can code your own. 🙂

Here is a simple example using a chart, but the general principle would be the same. (original discussion)

[newbieeng]

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@altenbach wrote:

If your version does not have the visibility checkbox, you can code your own. 🙂

Here is a simple example using a chart, but the general principle would be the same. (original discussion)

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I checked your solution and tried to adapt to my VI but it does not work as yours. I could not find what it is wrong with it. I attached the VI. I am working a simulated NI cDAQ 9188 on it with 2 NI 9214 thermocouple analog input modules. I want to use this property for all graphs in each tab. Can I do it easily? Do I have to event structure for all of them separately?

[altenbach · Accepted solution]

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@newbieeng wrote:
I checked your solution and tried to adapt to my VI but it does not work as yours. I could not find what it is wrong with it. I attached the VI. I am working a simulated NI cDAQ 9188 on it with 2 NI 9214 thermocouple analog input modules. I want to use this property for all graphs in each tab. Can I do it easily? Do I have to event structure for all of them separately?

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Just a quick glance so far:

• The event loop needs to be outside the main loop. Currently it stalls the main loop. It needs to run independently.
• You need to add a value change event on the boolean array to the timeout case.
• The boolean array needs as many elements as you have plots.
• ...

[newbieeng]

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@altenbach wrote:

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@newbieeng wrote:
I checked your solution and tried to adapt to my VI but it does not work as yours. I could not find what it is wrong with it. I attached the VI. I am working a simulated NI cDAQ 9188 on it with 2 NI 9214 thermocouple analog input modules. I want to use this property for all graphs in each tab. Can I do it easily? Do I have to event structure for all of them separately?

---

Just a quick glance so far:

• The event loop needs to be outside the main loop. Currently it stalls the main loop. It needs to run independently.
• You need to add a value change event on the boolean array to the timeout case.
• The boolean array needs as many elements as you have plots.
• ...

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I did all your suggestions but unfortunately they did not work. Where do I do wrong?I attached the new VI.

Also I noticed that simulated NI 9188 does not generate good signals precisely after excessing 26 thermocouple. Is it limited to generate signals for a limited number of channels?