MATLAB: How Do I Feed “logsout” Data Back into a Subsequent Simulation Using Buses

busbusesinportinputlogsoutobjectssimulationsimulinksubsequent

How do I feed "logsout" data back into a subsequent simulation as an input using buses?

Best Answer

Please find attached a simple example model demonstrating how to feed "logsout" bus signals back into the model. In order to run the model, please first load the "data.mat" file that is attached as well.

In summary, the following needs to be done:

Define input ports with their respective data types set to bus object
- Bus objects need to be defined in the base MATLAB workspace and these objects need to be indicative of the buses which will be used
- https://www.mathworks.com/help/simulink/slref/simulink.bus.createobject.html
Set the model to take simulation input from the base MATLAB workspace
- https://in.mathworks.com/help/simulink/import-data.html
- This must be performed with "Import" blocks as opposed to "From Workspace" blocks
- Please reference in the attached model the "Data Import/Export" configuration parameters for a more specific example

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MATLAB: Does Link for ModelSim include support for bi-directional buses

Simulink 7.0 (R2007b) does not have support for bi-directional signals or buses, it supports only unidirectional signals.

At present Simulink does not have multi-state logic values, only '0' and '1'. All 'Z', 'X', etc in HDL are converted to '0'.

However, you can avoid modifying the HDL code and can cosimulate bi-directional signals in HDL using Link for ModelSim. For the HDL Cosimulation block, you would need to specify the same signal twice: once as an input and once as an output. You would need to have a resolution function for proper simulation in HDL.

MATLAB: Is it possible to generate the signal logging variable “logsout” in the workspace when running a model using the syntax: [t,x,y] = sim(‘model_name’) in Simulink 6.1 (R14SP1)

This feature has been added in Simulink 6.2 (R14SP2). Now, Simulink creates the signal logging variable based on the configuration parameters of the model regardless of the syntax for the SIM command that you use.

Additionally, you can use the SIMSET command to override the model parameters. For example,

opts = simset('SignalLogging', 'on', 'SignalLoggingName', 'my_logsout_var'); [t,x,y]=sim('test.mdl',10,opts);

enables Signal Logging and creates a variable named 'my_logsout_var', even if Signal Logging is disabled in the model's configuration parameters. If you are using a previous version, read the following:

The ability to generate the "logsout" variable when using the the [t,x,y] = sim('model_name') syntax is not available in Simulink 6.1 (R14SP1). There are no workarounds.

Best Answer

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MATLAB: Does Link for ModelSim include support for bi-directional buses

MATLAB: Is it possible to generate the signal logging variable “logsout” in the workspace when running a model using the syntax: [t,x,y] = sim(‘model_name’) in Simulink 6.1 (R14SP1)

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