MATLAB: Simulink Real Time Code: Scope update speed issue/data logging issue

simulinkSimulink Real-Timespeedgoat

Hello,

I'm using Speedgoat Education edition and Simulink Real Time to conduct some Hardware-in-Loop testing. I'm struggling to get scopes to update in a timely fashion AND log data to workspace. I can do one or other by changing duration settings in Tools>External Mode Control Panel>Signals & Triggering.

I've a sample time of 100 ms.

I've the trigger options set to manual source, normal mode, a duration of 50 samples and a delay 0 seconds. The scopes will update every 5 seconds. But at end of 9 minute simulation I've only a few data points.

If I increase the duration to a number higher than number of samples in simulation run time I get the data but the scope doesn't update.

Can someone please explain what settings I need to change to get near real time (<5seconds) updating of scope AND log data for full simulation duration (approx 3-15 minutes)?

Thank you for any help on this matter, Ross

Best Answer

Which release are you using? The scope behavior changed a little in recent releases and now you can use tools like the Simulink Data Inspector to stream data back to the PC.

For logging data for the real-time application, it is recommended to log data directly on the target using the file scope. You can then use the command line API for Simulink Real-Time to retrieve the data in MATLAB, or alternatively you can use the slrtexplr to do that. (see: Data Logging with File Scope )

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We've heard this request from customers before and we have it in our plans to address it sometime in the future. For now, you can save the complete simulation data using the 'External Mode Control Panel'. You can do it in two different ways.

1) Increase the External mode trigger duration.

If you have a finite running simulation, you can change the External mode trigger duration to log more data. From your model, go to Code->External Mode Control Panel-> Signal & triggering -> Duration. Set this to a number that might be enough for you to capture the simulation data. Please note that some targets might limit you to have a specific trigger duration.

2) Saving simulation data to MAT files

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    a) Code -> External Mode Control Panel -> Data Archiving
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    c) In the 'Directory' edit box, specify a directory where you'd like to save the MAT file(s)
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Let me know if you have other questions!

Thanks,

Siddharth

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