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Model builder for System Composer architecture models


Build System Composer™ models using a ModelBuilder object. Build System Composer models with components and their position in architecture hierarchy, ports and their mappings to components, connections among components through ports, and interfaces in architecture models and their mappings to ports.


builder = % Creates the ModelBuilder object


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Component information, specified as a table. The table contains the hierarchical information of components, type of component (for example, Component, Reference Component, Variant Component, or Adapter), stereotypes applied on a component, and ability to set property values of a component.

Ports information, specified as a table. The table contains the information about ports, their mappings to components and interfaces, as well as stereotypes applied on them.

Connections information, specified as a table. The table contains information about the connections between the ports defined in ports table also stereotypes applied on connections.

Interfaces information, specified as a table. The table contains the definitions of various interfaces and their elements.


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Import architecture specifications into System Composer™ using the utility class. These architecture specifications can be defined in an external source, such as an Excel® file.

In System Composer, an architecture is fully defined by four sets of information:

  • Components and their position in the architecture hierarchy.

  • Ports and their mapping to components.

  • Connections among components through ports. In this example, we also import interface data definitions from an external source.

  • Interfaces in architecture models and their mapping to ports.

This example uses the class to pass all of the above architecture information and import a System Composer model.

In this example, architecture information of a small UAV system is defined in an Excel spreadsheet and is used to create a System Composer architecture model.

External Source Files

  • Architecture.xlsx — This Excel file contains hierarchical information of the architecture model. This example maps the external source data to System Composer model elements. Below is the mapping of information in column names to System Composer model elements.

     # Element    : Name of the element. Either can be component or port name.
     # Parent     : Name of the parent element.
     # Class      : Can be either component or port(Input/Output direction of the port).
     # Domain     : Mapped as component property. Property "Manufacturer" defined in the
                    profile UAVComponent under Stereotype PartDescriptor maps to Domain values in excel source file.
     # Kind       : Mapped as component property. Property "ModelName" defined in the
                    profile UAVComponent under Stereotype PartDescriptor maps to Kind values in excel source file.
     # InterfaceName : If class is of port type. InterfaceName maps to name of the interface linked to port.
     # ConnectedTo : In case of port type, it specifies the connection to
                     other port defined in format "ComponentName::PortName".
  • DataDefinitions.xlsx — This Excel file contains interface data definitions of the model. This example assumes the below mapping between the data definitions in the Excel source file and interfaces hierarchy in System Composer.

     # Name        : Name of the interface or element.
     # Parent      : Name of the parent interface Name(Applicable only for elements) .
     # Datatype    : Datatype of element. Can be another interface in format
                     Bus: InterfaceName
     # Dimensions  : Dimensions of the element.
     # Units       : Unit property of the element.
     # Minimum     : Minimum value of the element.
     # Maximum     : Maximum value of the element.

Step 1. Instantiate the ModelBuilder Class

You can instantiate the ModelBuilder class with a profile name.

[stat,fa] = fileattrib(pwd);
if ~fa.UserWrite
    disp('This script must be run in a writable directory');
% Name of the model to build.
modelName = 'scExampleModelBuider';
% Name of the profile.
profile = 'UAVComponent';
% Name of the source file to read architecture information.
architectureFileName = 'Architecture.xlsx';

% Instantiate the ModelBuilder.
builder =;

Step 2. Build Interface Data Definitions

Reading the information in the external source file DataDefinitions.xlsx, build the interface data model.

Create MATLAB® tables from the Excel source file.

opts = detectImportOptions('DataDefinitions.xlsx');
opts.DataRange = 'A2'; % force readtable to start reading from the second row.
definitionContents = readtable('DataDefinitions.xlsx',opts);

% class generates unique ID for a
% given key
idService =;

for rowItr =1:numel(definitionContents(:,1))
    parentInterface = definitionContents.Parent{rowItr};
    if isempty(parentInterface)
        % In case of interfaces adding the interface name to model builder.
        interfaceName = definitionContents.Name{rowItr};
        % Get unique interface ID. getID(container,key) generates 
        % or returns (if key is already present) same value for input key
        % within the container.
        interfaceID = idService.getID('interfaces',interfaceName);
        % Builder utility function to add interface to data
        % dictionary.
        % In case of element read element properties and add the element to
        % parent interface.
        elementName  = definitionContents.Name{rowItr};
        interfaceID = idService.getID('interfaces',parentInterface);
        % ElementID is unique within a interface.
        % Appending 'E' at start of ID for uniformity. The generated ID for
        % input element is unique within parent interface name as container. 
        elemID = idService.getID(parentInterface,elementName,'E');
        % Datatype, dimensions, units, minimum and maximum properties of
        % element.
        datatype = definitionContents.DataType{rowItr};
        dimensions = string(definitionContents.Dimensions(rowItr));
        units = definitionContents.Units(rowItr);
        % Make sure that input to builder utility function is always a
        % string.
        if ~ischar(units)
            units = '';
        minimum = definitionContents.Minimum{rowItr};
        maximum = definitionContents.Maximum{rowItr};
        % Builder function to add element with properties in interface.

Step 3. Build Architecture Specifications

Architecture specifications are created by MATLAB tables from the Excel source file.

excelContents = readtable(architectureFileName);
% Iterate over each row in table.
for rowItr =1:numel(excelContents(:,1))
% Read each row of the excel file and columns.
    class = excelContents.Class(rowItr);
    Parent = excelContents.Parent(rowItr);
    Name = excelContents.Element{rowItr};
    % Populating the contents of table using the builder.
    if strcmp(class,'component')
        ID = idService.getID('comp',Name);
        % Root ID is by default set as zero.
        if strcmp(Parent,'scExampleSmallUAV')
            parentID = "0";
            parentID = idService.getID('comp',Parent);
        % Builder utility function to add component.
        % Reading the property values
        kind = excelContents.Kind{rowItr};
        domain = excelContents.Domain{rowItr};
        % *Builder to set stereotype and property values.
        % In this example, concatenation of port name and parent component name 
        % is used as key to generate unique IDs for ports. 
        portID = idService.getID('port',strcat(Name,Parent));
        % For ports on root architecture. compID is assumed as "0".
        if strcmp(Parent,'scExampleSmallUAV')
            compID = "0";
            compID = idService.getID('comp',Parent);
        % Builder utility function to add port.
        builder.addPort(Name,class,portID,compID );
        % InterfaceName specifies the name of the interface linked to port.
        interfaceName = excelContents.InterfaceName{rowItr};
        % Get interface ID. getID() will return the same IDs already
        % generated while adding interface in Step 2.
        interfaceID = idService.getID('interfaces',interfaceName);
        % Builder to map interface to port.
        % Reading the connectedTo information to build connections between
        % components.
        connectedTo = excelContents.ConnectedTo{rowItr};
        % connectedTo is in format:
        % (DestinationComponentName::DestinationPortName).
        % For this example, considering the current port as source of the connection. 
        if ~isempty(connectedTo)
            connID = idService.getID('connection',connectedTo);
            splits = split(connectedTo,'::');
            % Get the port ID of the connected port.
            % In this example, port ID is generated by concatenating
            % port name and parent component name. If port id is already
            % generated getID() function returns the same id for input key.
            connectedPortID = idService.getID('port',strcat(splits(2),splits(1))); 
            % Using builder to populate connection table.
            sourcePortID = portID;
            destPortID = connectedPortID;
            % Builder to add connections.

Step 3. Import Model from Populated Tables with Function

[model,importReport] =;

Close Model


More About

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addComponent(compName, ID, ParentID)Add component with name and ID as a child of component with ID as ParentID. In case of root, ParentID is 0.
setComponentProperty(ID, varargin)

Set stereotype on component with ID. Key value pair of property name and value defined in the stereotype can be passed as input. In this example

 builder.setComponentProperty(ID, 'StereotypeName',...
ModelName and Manufacturer are properties under stereotype PartDescriptor.

addPort(portName, direction, ID, compID)Add port with name and ID with direction (either Input or Output) to component with ID as compID.
setPropertyOnPort(ID, varargin)Set stereotype on port with ID. Key value pair of the property name and the value defined in the stereotype can be passed as input.
addConnection(connName, ID, sourcePortID,destPortID)Add connection with name and ID between ports with sourcePortID (direction: Output) and destPortID (direction: Input) defined in the ports table.
setPropertyOnConnection(ID, varargin)Set stereotype on connection with ID. Key value pair of the property name and the value defined in the stereotype can be passed as input.
addInterface(interfaceName, ID)Add interface with name and ID to a data dictionary.
addElementInInterface(elementName, ID, interfaceID, datatype, dimensions, units, complexity, Maximum, Minimum)Add element with name and ID under an interface with ID as interfaceID. Data types, dimensions, units, complexity, and maximum and minimum are properties of an element. These properties are specified as strings.
addAnonymousInterface(ID, datatype, dimensions, units, complexity, Maximum, Minimum)Add anonymous interface with ID and element properties like data type, dimensions, units, complexity, maximum and minimum. Data type of an anonymous interface cannot be another interface name. Anonymous interfaces do not have elements like other interfaces.
Interfaces and PortsDescription
addInterfaceToPort(interfaceID, portID)Link an interface with ID specified as InterfaceID to a port with ID specified as PortID.
build(modelName)Build model with model name passed as input.
Logging and ReportingDescription
getImportErrorLog()Get ErrorLogs generated while importing the model . Called after the build() function
getImportReport()Get a report of the import. Called after the build() function.
Introduced in R2019b