MATLAB: How to get control over the signals which are being logged in the model

simulink

I have a model with a lot of subsystems inside it. I want to know which signals are being logged in "logsout" output. I want to have control over the signals that are being logged. How do I do that?

Best Answer

You can use the 'InstrumentedSignals' property for each model level to determine what signals are/aren't logged. For example:

>> get_param(<insert_model_name>, 'InstrumentedSignals').

Using the set_param variation of the above API, you can programmatically log whichever signals you want to, provided they are known.

Please refer to the following links for more information on the above workflow:

https://www.mathworks.com/help/simulink/slref/simulink.hmi.instrumentedsignals-class.html

https://www.mathworks.com/help/simulink/slref/simulink.sdi.marksignalforstreaming.html

Related Solutions

MATLAB: How to modify signal logging overrides for tests with multiple model references

Firstly, the following page indicates that you should set "LoggingMode" to "OverrideSignals" to control the logging mode for the top level model and all referenced models.

https://www.mathworks.com/help/releases/R2019a/simulink/slref/simulink.simulationdata.modellogginginfo.html

It is also possible to use a mix of override signal logging settings and model-specified (ignore override) logging settings using an cell array for "LogAsSpecifiedByModels".

https://www.mathworks.com/help/releases/R2019a/simulink/slref/simulink.simulationdata.modellogginginfo.html#bs4yto_-1

Secondly, the following example walks through how you can selectively modify the "ModelLoggingInfo" for specific models in a reference hierarchy, and "DataLogging" settings for specific signals within those models.

https://www.mathworks.com/help/releases/R2019a/simulink/ug/overriding-signal-logging-settings.html#bs41x_u

Pay particular attention to the "Log a Subset of Signals" example. It uses "findSignal" and a loop to change the "DataLoggingOverride" settings for each signal.

mi = Simulink.SimulationData.ModelLoggingInfo.createFromModel(...
             'ex_bus_logging');
pos = mi.findSignal({'ex_bus_logging/CounterA' ... 
                     'ex_mdlref_counter_bus/Bus Creator'}, 1)
for idx=1:length(mi.Signals)
  mi.Signals(idx).LoggingInfo.DataLogging = (idx == pos);
end

To apply the override settings, you use the following syntax:

set_param(ex_bus_logging,'DataLoggingOverride', mi);

To save the "Override Signals" configuration to apply it later, use "get_param" as follows:

>>si = get_param(bdroot,'DataLoggingOverride')

MATLAB: How is it possible to deactivate signal logging of referenced models in the InitFcn callback

Doing it like in the described way is indeed not possible, but it sounds like the Signal Logging Override feature is exactly what you are looking for:

<https://www.mathworks.com/help/simulink/ug/overriding-signal-logging-settings.html>

This feature allows the user to override the signal logging for the entire model hierarchy without the need for modifying referenced models. Using the override you log a subset of the signals selected to log in each model or none of them. There is both a programmatic and graphical approach for this, which can both be found from the documentation above.

Best Answer

Related Solutions

MATLAB: How to modify signal logging overrides for tests with multiple model references

MATLAB: How is it possible to deactivate signal logging of referenced models in the InitFcn callback

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