Simulated NI-9361 module not available to detect in LabView

[HosseinBakhtiari]

Hey all,

I have configured 4 different simulated NI modules (figure 1). However, I'm not able to detect the NI-9361 module in LabView Front Panel (figure 2). I wonder if anyone has faced a similar problem and knows I could procced. 

Figure 1. The 4 configured modules.

Figure 2. Selection of module pins in LabView Front Panel, as it can bee seen the FlowMod (IN-9361) is not available to be selected.

Additional info

- I'm using LabVIEW 2021 SP1.

- The other 3 modules work correctly and I'm able to read from all their pins. 

All help is appreciated!

Kind regards,

Hossein

[GerdW]

Hi Hossein,

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@HosseinBakhtiari wrote:

I have configured 4 different simulated NI modules (figure 1). However, I'm not able to detect the NI-9361 module in LabView Front Panel (figure 2).

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Figure 2 does not show a "LabVIEW frontpanel". Most probably it shows a dialog to select a channel within the DAQAssistent ExpressVI!

The NI9361 is a CTR module, while the other 3 are AI modules. When you start the DAQAssistent to get AI values then it will not present CTR channels…

[HosseinBakhtiari]

Hey GerdW,

Thanks for your response. You're right, figure 2 does not show the Front Panel, it is a screenshot of a window that pops up when one needs to select a physical channel in Front Panel. 

 Any suggestion on how I should proceed? 

For the other three modules I'm using DAQmx to create virtual channels, figure below shows the setup I'm using for Current measurement. Do I need to use some other component than DAQmx to read from a CTR module or can I just change the DAQmx setup? And any suggestions on a link, where I can read more about AI and CTR modules? 

Kind regards,

Hossein

[GerdW · Accepted solution]

Hi Hossein,

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@HosseinBakhtiari wrote:

For the other three modules I'm using DAQmx to create virtual channels, figure below shows the setup I'm using for Current measurement. Do I need to use some other component than DAQmx to read from a CTR module or can I just change the DAQmx setup?

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Place a new CreateVirtualChannel, set it's instance to any of the "Counter" modes. Then create a DAQmxChannel control by right-clicking the corresponding input of CreateVirtualChannel. Now the control should allow to look for counter channels.

One more thing you could try: at edit time right-click the DAQmxChannel control and select "IO name filter". A dialog will open where you can choose which kind of channels you look for…

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@HosseinBakhtiari wrote:

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On your VI:

• Do you really need 8 shift registers to hold the values of 8 channels? Why not use one 2D array to hold all channels?
• Do you really need to call that scaling function 8 times, once for each channel? Wouldn't it be easier to scale all samples at once - or even apply a DAQmxScale at the CreateVirtualChannel function?
• Building that XY graph also is much easier once you use a FOR loop for all channels…
• Appending samples to evergrowing arrays is highly inefficient for the memory manager!
• As soon as you read the first ~1000 samples you have more samples in your arrays than your graph is able to present - highly inefficient…
• You set a samplerate of 10S/s, but you limit your loop to read just 2S/s! This is highly inefficient and begs for errors later on! When you define a samplerate then you should NOT add another WAIT inside the DAQ loop…

[HosseinBakhtiari]

Hey GerdW,

Thank you for your help, the first suggestion worked!

PS. thank you for your feedback on the VI, it is just a first sketch for the reading part of the program, but I'll definitely consider your suggestions and use them!

Kind regards,

Hossein