MATLAB: How to vary the values of the Analog Output signals during real-time simulation on the target in xPC Target 2.7.2 (R14SP2)

analogchangeinputoutputSimulink Real-Timevaryxpc

I have a model in which I am receiving signals, via my target, from an amplifier using the PCI-6052E Analog Input block. I am then sending signals to the amplifier using a PCI-6052E Analog Output block. I would like to be able to change the signals being sent by the Analog Output block once the model has been built and is running in real-time. Furthermore, the signals are independent of the Analog Input signals and I would like to be able to specify the values of these signals at any time.

Best Answer

This can be done in xPC Target 2.7.2 (R14SP2) by using a Look-Up Table block. The attached model, lookupex.mdl, provides a simple example of this. The Lookup Tables are fed by constant blocks. If you build this model and enter the command:
set(tg,'ShowParameters','on');
you will see the following tunable parameters:
 Parameters           = INDEX   VALUE             TYPE      SIZE    PARAMETER NAME                BLOCK NAME                    
                           0       [...]             DOUBLE    1*10    Value                         Constant                      
                           1       [...]             DOUBLE    1*10    Value                         Constant1                     
                           2       [...]             DOUBLE    1*10    InputValues                   Lookup Table                  
                           3       [...]             DOUBLE    10*1    OutputValues                  Lookup Table                  
                           4       [...]             DOUBLE    1*10    InputValues                   Lookup Table1                 
                           5       [...]             DOUBLE    10*1    OutputValues                  Lookup Table1
Therefore, you can completely specify vectors for the Analog Output using the values for the Constant blocks and the the Output Values in the Lookup Tables with the SETPARAM function as follows:
setparam(tg,3,rand(1,10));
Match up the first input value with the Output Value you would like for the first element of the vector, and so on. You could do this independent of Analog Input values, or any other values for that matter. You can also set the sample times based on the length of time you want the signals to be output.
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