MATLAB: How to log incremental data with Real-Time Windows Target 3.6 (R2010b)

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I am running a model in Real-Time Windows Target for data collection. To be sure that I do not lose all gathered data in case of a System Crash I would like to save the data during the runtime of the model.

Best Answer

This can be done with Real-Time Windows Target.

Look at the attached model for the exact steps:

1. Open the model

2. Tools --> External Mode Control Panel

2.1. Signal & Triggering ...

--> Take a look at the settings here

2.2. Data Archiving ...

--> Take a look at the settings here

Adjust the path according to your system.

Note that the data needs to be saved to a subfolder of the working directory.

The Scope1 is only there for triggering.

In addition the Scopes of which you want to log the data need to be configured accordingly:

Open the Scope --> Parameters --> Data History --> Save Data to Workspace ...

This will result in MAT-files with incremental suffixes.

Each MAT-file contains the scopedata of the corresponding trigger. If you open the MAT-files you will see the data in the MATLAB workspace with the according suffixes.

Related Solutions

MATLAB: How to save all of the data from a simulation running in external mode to one file

Hi Matt,

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

You can also save simulation data to MAT file(s). The number of MAT files generated will depend on the 'External mode trigger duration'. For example: If the trigger duration is set to 100 and the complete simulation generates 200 data points, you will get two MAT files. The first will have data stored in a variable from T1 -> T100 and the second will have data from T101 -> T200. You can follow the steps below to try this out.

    a) Code -> External Mode Control Panel -> Data Archiving
    b) Check the 'Enable archiving' box. 
    c) In the 'Directory' edit box, specify a directory where you'd like to save the MAT file(s)
    d) In the 'File' edit box, enter a name for your MAT file.

Let me know if you have other questions!

Thanks,

Siddharth

MATLAB: Triggering Fixed-Length Data Capture from Infinite-Length Simulink Simulation (Real-Time)

This can be done by utilizing the External Mode triggering feature. In the model, just leave the Analog Input (or whatever) block outside any triggered or enabled subsystem, so that it measures the data for the whole duration of the experiment. Then, use External Mode to only log the intervals you are interested in.

To do this, go to Code, External Mode Control Panel, Signal & Triggering. There, select the Duration parameter so that it corresponds to 30 seconds - e.g., for sample rate of 1 kHz, that would be 30.000 samples, so you would set this as Duration. Then, set the Mode to one-shot, so that data logging stops and is not re-triggered after one buffer of data is collected. Finally, deselect Arm when connecting to target so that data logging does not start immediately after the model is started, and close the GUI.

Then, build and run your model, leaving the External Mode Control Panel open. Every time you want to log the data, press the Arm Trigger button and you'll get one buffer of data. If you prefer to build your own GUI instead, command-line equivalents of setting the External Mode parameters and arming the trigger do exist.

You may also want to take a look at the Data Archiving feature that allows you to automatically save the captured data buffers into MAT-files with auto-incremented names, so you don't need to take care of reading the captured buffer from workspace.

And, if you want to automate the process further, you may set External Mode to start the logging automatically when some signal crosses a specified value, and this can also include pre-trigger (start logging before the trigger event occurs). Please see the documentation for more information on that.

Best Answer

Related Solutions

MATLAB: How to save all of the data from a simulation running in external mode to one file

MATLAB: Triggering Fixed-Length Data Capture from Infinite-Length Simulink Simulation (Real-Time)

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