Size of the model step

Hello

I have a PXI-8106RT controller.

I'm trying to run a model (dll), created under Matlab. It is a regulator of voltage/current. It is allowed when the model is compiled with a 10 kHz step size.

But when I go up to 100 kHz, the model does not work very well because the pattern string Count increases significantly over time.

I need to run the model at 10 MHz.

Is there a way to do this? What I have to put something under Matlab for better performance? Do I need a better controller?

Thank you

Hi Alexandra,.

It depends on the model and the hardware configuration, but no, I don't expect to see more than 15 kHz on a 8133.

However, there are a few other options that might be possible to achieve a faster rate.

1. we have worked on a custom internal device that manages the models outside the normal framework of VeriStand at a much faster pace.  VeriStand engine still works at the lower rate (e.g., 1 kHz), but a separate loop takes an acquisition of input data, executing a template and writing a DAQ output.  This model works at a much faster pace and communicates the current values of the VeriStand engine VeriStand rate.  With this technique, we were able to run complex models on a 8133 about 50 kHz.  Simpler models were executed near 140 kHz.

Depending on your configuration, this might be a possibility for you.  If you are able to provide us with your model (.mdl file preference, so we can make sure that it is compiled optimally), we could compare it to you and give an estimate for the maximum rate that we can run it.

2. from your description of the model, it seems very simple.  Simply a voltage/current controller.  If this is the case, perhaps this logic could then be implemented on a FPGA Board instead of a model.  The FPGA can read an entry, the rules and write an output without needing all the resources of your processor from RT.  Provided that the calculation is not too complex, you can run this VERY quickly.  However, I still don't think that you would be able to reach 10 MHz.  The limiting factor would probably be on our FPGA boards analog sampling rates.  The planks of the PXI-785XR can enjoy HAVE to 750 kHz and AO output at 1 MHz.  If we talk about analog signals, it would be difficult to find something much faster than that.  If it's just digital TTL points out, however, they can go a lot faster at this Board (ie. 40 MHz).

I'm always curious to know what your app is and why you need this race at this rate.  If we had a better understanding of your request and what you hope to accomplish, perhaps we could provide better guidance.  If you wish, you can send me a private message with your details, and I can get you in touch with a resource in your area that specializes in these application areas.

Kind regards

Devin

Tags: NI Products

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