Simulation Interface Toolkit (SIT) Tutorial

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MEEN 364J. MlcakLast Update: 8/27/2006The Front panel of the main VI is shown in Figure 12. Select the “Run SIT”button on the Front panel to run the SIT/Simulink diagram in LabVIEW, and select the“Stop SIT” button on the Front panel to stop the SIT/Simulink diagram in LabVIEW.*NOTE: Do not use the stop button labeled “Stop VI” or the stop button on the toptoolbar. These stop buttons do not properly close the SIT/Simulink connection withLabVIEW.Run SITStop SITFigure 12. LabVIEW Front panel after SIT connections are establishedTo convert the logged data to a variable in the MATLAB workspace, make surethe “.txt” file is in the MATLAB working directory. At the MATLAB command promptor a M-file type:load Trial_1.txtwhere Trial_1.txt is the filename given in the Write LVM block. This will create an arraylabeled Trial_1 in the MATLAB workspace. The first column of the array is time, andthe second column is the data set that was logged while running SIT.The data can be opened in Excel by first opening Excel, then going toFile>>Open. Under the “Files of Type” drop-down menu, select Text Files. Then selectthe “.txt” file containing the data you want. Click the next button twice, and then clickthe finish button. The data can then be manipulated using Excel. Like MATLAB, thefirst column is time, and the second column is the data set that was logged while runningSIT.10
3. SummaryMEEN 364J. MlcakLast Update: 8/27/20061. Create a folder for your lab projects.2. Open MATLAB and change the working directory to your lab project folder.3. Create Simulink Diagram:a. Label all blocks with a unique and descriptive name.b. Include an In block for each analog input data acquisition terminal.c. Include an Out block for each analog output operation.d. Insert an NI Sink where data values will be viewed in LabVIEW.e. Give constants and gains nominal values if appropriate.f. Include at least one “In” and “Out” block even if the blocks are not used.If the In or Out block is not used, do not connect it to anything.4. Set the sampling frequency, fixed calculation step size, and real-time workshop:a. Go to Simulation>>Simulation Parameters>>Solver tab:i. Set a Stop time (can leave at default of 10 seconds).ii. Under Solver Options, select the type as Fixed-step with the ode5(Dormand-Prince) solver.iii. Under Fixed step size, type in the sampling time in seconds. Forexample, if sampling at 100 Hz, type 0.01 seconds.b. Select the Workspace I/O tab:i. Uncheck all boxes in the Save to workspace area.ii. Uncheck “Limit data points to last” dialog box in the Save optionsarea.c. Select the Real-Time Workshop tab:i. Select browse.ii. Select nidll.tlc (LabVIEW DLL Target) >> OK.d. Click Apply and OK to close the Simulation Parameters dialog box.e. From the drop-down menu on the toolbar, select External.f. Save the Simulink model. Recall that no spaces can appear in a Simulinkfile name. The first character in the filename must not be a number.g. Ask your lab Teaching Assistant to review your Simulink model beforecontinuing.5. Close all LabVIEW programs that may be open, and build the Simulink model byselecting Tools >> Real-Time Workshop >> Build Model, or press Ctrl+B.6. Allow the Simulink model to build. LabVIEW will open and close in the process.The build is complete when the MATLAB command prompt displays:### Successful completion of Real-Time Workshop buildprocedure for model: filename.7. Do NOT close MATLAB.8. Open LabVIEW and create a New (blank) VI.9. Select the Front panela. Add a numerical or dial control for every data value you wish to change(ex. gains and constants).b. Add a numerical or graphical indicator for every data value you wish tooutput from your simulink model. At least one indicator must be presentfor each NI Sink used in the Simulink model.11
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Simulation Interface Toolkit (SIT) Tutorial

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