MATLAB: How to toggle showing the propagated signals of a bus in Simulink 7.1 (R2008a)

simulink

When I have a bus signal, I can right click on it, and select "Signal Properties", which brings up a popup menu where I can change the "Show propagated signals" property to either 'on', 'off', or 'all'. I would like to do this from the MATLAB command line.

Best Answer

Instead of modifying the properties of the bus signals, you modify the properties of the Bus Creator blocks. Each Bus Creator block has a 'PortHandles' handle which can be retrieved with GET_PARAM. The resulting handle has 'Inport' and 'Outport' handles within it. The Outport handles have a 'ShowPropagatedSignals' property, which can be set to 'on', 'off', or 'all' using SET_PARAM. Note that this cannot be done with the Inport handles.

The attached set_propagation.m file shows how to set the signal propagation to 'on' with the sfbus_demo.mdl demo model.

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MATLAB: How to retrieve names of signals in a bus when the signal names have been propagated by Simulink

This enhancement has been incorporated in Release 2010a (R2010a). For previous product releases, read below for any possible workarounds:

The ability to use a command-line command to retrieve the names of propagated signals in a bus signal is not available in Simulink.

To work around this issue, use the following code:

busdemo
ph = get_param('busdemo/Bus Creator', 'porthandles')
set_param(ph.Outport, 'CacheCompiledBusStruct', 'on')
busdemo([],[],[],'compile')
bs = get_param(ph.Outport, 'CompiledBusStruct')
busdemo([],[],[],'term')

The variable 'bs' will contain information on the bus signal coming out of the Bus Creator. You can recursively walk through this structure to determine all actual sources of the bus and hence all source data types, dimensions, signal names, etc.

Note that the following code makes use of the internal compiled property 'CacheCompiledBusStruct' and hence is subject to change in future releases.

Another workaround to retrieve the names of signals in a bus is to pass all the Bus Creator outputs to a Bus Selector block, which selects all of the signals from the Bus Creator block, then use the following code to extract the signal names, where the Bus Selector block is the currently selected block:

get_param(gcb, 'OutputSignals')

MATLAB: How to retrieve the name of a signal coming into a Bus Creator block in Simulink, when the signal is not propagated from a Subsystem, without having to update the diagram

The ‘SignalHierarchy’ property of the Outport of the bus can be used to extract the name of the children signals. Though the name of the Inport signals is not available before the model is updated, if the children signals of the Outport are accessed, then the name is visible even before the model is updated.

Here is an example on how to extract the name of the signal from the command line, by using the 'SignalHierarchy' property.

   busCreator = 'model2/Subsystem1/Bus Creator1';
   ph = get_param(busCreator,'PortHandles');
   sh = get_param(ph.Outport, 'SignalHierarchy')
   sh.Children(1).SignalName

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Related Solutions

MATLAB: How to retrieve names of signals in a bus when the signal names have been propagated by Simulink

MATLAB: How to retrieve the name of a signal coming into a Bus Creator block in Simulink, when the signal is not propagated from a Subsystem, without having to update the diagram

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