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Allocation between source element and target element

Since R2020b


    An Allocation object defines the allocation between the source element and the target element.

    Related objects include:


    Create two allocations between four elements in the default scenario, Scenario 1, using the allocate function.

    defaultScenario = allocSet.getScenario("Scenario 1");


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    Source element, specified as a systemcomposer.arch.Element object.

    Target element, specified as a systemcomposer.arch.Element object.

    Allocation scenario, specified as a systemcomposer.allocation.AllocationScenario object.

    Universal unique identifier, specified as a character vector.

    Example: '91d5de2c-b14c-4c76-a5d6-5dd0037c52df'

    Data Types: char

    Object Functions

    applyStereotypeApply stereotype to architecture model element
    getStereotypesGet stereotypes applied on element of architecture model
    removeStereotypeRemove stereotype from model element
    setPropertySet property value corresponding to stereotype applied to element
    getPropertyGet property value corresponding to stereotype applied to element
    getPropertyValueGet value of architecture property
    getEvaluatedPropertyValueGet evaluated value of property from element
    getStereotypePropertiesGet stereotype property names on element
    hasStereotypeFind if element has stereotype applied
    hasPropertyFind if element has property
    destroyRemove model element


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    Use allocations to analyze a tire pressure monitoring system.


    In systems engineering, it is common to describe a system at different levels of abstraction. For example, you can describe a system in terms of its high-level functions. These functions may not have any behavior associated with them but most likely trace back to some operating requirements the system must fulfill. We refer to this layer (or architecture) as the functional architecture. In this example, an automobile tire pressure monitoring system is described in three different architectures:

    1. Functional Architecture — Describes the system in terms of its high-level functions. The connections show dependencies between functions [1].

    2. Logical Architecture — Describes the system in terms of its logical components and how data is exchanged between them. Additionally, this architecture specifies behaviors for model simulation [2].

    3. Platform Architecture — Describes the physical hardware needed for the system at a high level [3].

    Note: This example illustrates allocations in System Composer™ using a specific methodology. However, you can use other methodologies that fit your needs.

    The allocation process is defined as linking these three architectures that fully describe the system. The linking captures the information about each architectural layer and makes it accessible to the others.

    Use this command to open the project.


    Tire pressure monitoring system example model.

    Open the FunctionalAllocation.mldatx file, which displays allocations from TPMS_FunctionalArchitecture to TPMS_LogicalArchitecture in the Allocation Editor. The elements of TPMS_FunctionalArchitecture are displayed in the first column. The elements of TPMS_LogicalArchitecture are displayed in the first row. The arrows indicate the allocations between model elements.

    Tire pressure example allocation scenario.

    The arrows display allocated components in the model. You can observe allocations for each element in the model hierarchy.

    The rest of the example shows how to use this allocation information to further analyze the model.

    Functional to Logical Allocation and Coverage Analysis

    This section shows how to perform coverage analysis to verify that all functions have been allocated. This process requires using the allocation information specified between the functional and logical architectures.

    To start the analysis, load the allocation set.

    allocSet = systemcomposer.allocation.load('FunctionalAllocation');
    scenario = allocSet.Scenarios;

    Verify that each function in the system is allocated.

    import systemcomposer.query.*;
    [~,allFunctions] = allocSet.SourceModel.find(HasStereotype(IsStereotypeDerivedFrom("TPMSProfile.Function")));
    unAllocatedFunctions = [];
    ImplementedAllocations = [];
    for i = 1:numel(allFunctions)
        alloc = scenario.getAllocatedTo(allFunctions(i));
        if isempty(alloc)
            unAllocatedFunctions(end+1) = allFunctions(i);
    allCompsSource = allocSet.SourceModel.find(AnyComponent);
    allCompsTarget = allocSet.TargetModel.find(AnyComponent);
    for i = 1:numel(allCompsSource)
        for j = 1:numel(allCompsTarget)
            sourceComp = allocSet.SourceModel.lookup(Path=allCompsSource{i});
            targetComp = allocSet.TargetModel.lookup(Path=allCompsTarget{j});
            allocated = scenario.getAllocation(sourceComp,targetComp);
            if ~isempty(allocated)
                if allocated.getPropertyValue("TPMSProfile.FunctionalAllocation.IsImplemented")
                    ImplementedAllocations(end+1) = strcat(sourceComp.Name," to ",targetComp.Name);
    if isempty(unAllocatedFunctions)
      fprintf('All functions are allocated');
      fprintf('%d Functions have not been allocated',numel(unAllocatedFunctions));
    All functions are allocated
    if isempty(ImplementedAllocations)
      fprintf('No allocations are implemented');
      fprintf('%d Allocations have been implemented',numel(ImplementedAllocations));
    6 Allocations have been implemented

    The result displays All functions are allocated to verify that all functions in the system are allocated and lists the allocations that have not been implemented.

    Analyze Suppliers Providing Functions

    This section shows how to identify which functions will be provided by which suppliers using the specified allocations. Since suppliers will be delivering these components to the system integrator, the supplier information is stored in the logical model.

    suppliers = {'Supplier A','Supplier B','Supplier C','Supplier D'};
    functionNames = arrayfun(@(x) x.Name, allFunctions,'UniformOutput',false);
    numFunNames = length(allFunctions);
    numSuppliers = length(suppliers);
    allocTable = table('Size',[numFunNames,numSuppliers],'VariableTypes',...
    allocTable.Properties.VariableNames = suppliers;
    allocTable.Properties.RowNames = functionNames;
    for i = 1:numFunNames
      elem = scenario.getAllocatedTo(allFunctions(i));
      for j = 1:numel(elem)
          elemSupplier = getEvaluatedPropertyValue(elem(j),"TPMSProfile.LogicalComponent.Supplier");
          allocTable{i,strcmp(elemSupplier,suppliers)} = 1;

    The table shows which suppliers are responsible for the corresponding functions.

    allocTable=8×4 table
                                        Supplier A    Supplier B    Supplier C    Supplier D
                                        __________    __________    __________    __________
        Report Tire Pressure Levels         1             0             0             0     
        Report Low Tire Pressure            1             0             0             0     
        Measure rotations                   0             1             0             0     
        Measure temprature of tire          0             0             0             1     
        Measure pressure on tire            0             0             1             0     
        Calculate if pressure is low        1             0             0             0     
        Measure Tire Pressure               0             0             0             0     
        Calculate Tire Pressure             0             1             0             0     

    Analyze Software Deployment Strategies

    You can determine if the Engine Control Unit (ECU) has enough capacity to house all the software components. The software components are allocated to the cores themselves, but the ECU is the component that has the budget property.

    Get the platform architecture.

    platformArch = systemcomposer.loadModel('PlatformArchitecture');

    Load the allocation.

    softwareDeployment = systemcomposer.allocation.load('SoftwareDeployment');
    frontECU = platformArch.lookup('Path','PlatformArchitecture/Front ECU');
    rearECU = platformArch.lookup('Path','PlatformArchitecture/Rear ECU');
    scenario1 = softwareDeployment.getScenario('Scenario 1');
    scenario2 = softwareDeployment.getScenario('Scenario 2');
    frontECU_availMemory = getEvaluatedPropertyValue(frontECU,"TPMSProfile.ECU.MemoryCapacity");
    rearECU_availMemory = getEvaluatedPropertyValue(rearECU,"TPMSProfile.ECU.MemoryCapacity");
    frontECU_memoryUsed1 = getUtilizedMemoryOnECU(frontECU,scenario1);
    frontECU_isOverBudget1 = frontECU_memoryUsed1 > frontECU_availMemory;
    rearECU_memoryUsed1 = getUtilizedMemoryOnECU(rearECU,scenario1);
    rearECU_isOverBudget1 = rearECU_memoryUsed1 > rearECU_availMemory;
    frontECU_memoryUsed2 = getUtilizedMemoryOnECU(frontECU,scenario2);
    frontECU_isOverBudget2 = frontECU_memoryUsed2 > frontECU_availMemory;
    rearECU_memoryUsed2 = getUtilizedMemoryOnECU(rearECU,scenario2);
    rearECU_isOverBudget2 = rearECU_memoryUsed2 > rearECU_availMemory;

    Build a table to showcase the results.

    softwareDeploymentTable = table([frontECU_memoryUsed1;frontECU_availMemory;...
      [frontECU_memoryUsed2; frontECU_availMemory; frontECU_isOverBudget2;rearECU_memoryUsed2;...
      rearECU_availMemory; rearECU_isOverBudget2],...
      'VariableNames',{'Scenario 1','Scenario 2'},...
      'RowNames',{'Front ECUMemory Used (MB)','Front ECU Memory (MB)','Front ECU Overloaded',...
      'Rear ECU Memory Used (MB)','Rear ECU Memory (MB)','Rear ECU Overloaded'})
    softwareDeploymentTable=6×2 table
                                     Scenario 1    Scenario 2
                                     __________    __________
        Front ECUMemory Used (MB)       110            90    
        Front ECU Memory (MB)           100           100    
        Front ECU Overloaded              1             0    
        Rear ECU Memory Used (MB)         0            20    
        Rear ECU Memory (MB)            100           100    
        Rear ECU Overloaded               0             0    
    function memoryUsed = getUtilizedMemoryOnECU(ecu, scenario)

    For each component in the ECU, accumulate the binary size required for each allocated software component.

    coreNames = {'Core1','Core2','Core3','Core4'};
    memoryUsed = 0;
    for i = 1:numel(coreNames)
      core = ecu.Model.lookup('Path',[ecu.getQualifiedName '/' coreNames{i}]);
      allocatedSWComps = scenario.getAllocatedFrom(core);
      for j = 1:numel(allocatedSWComps)
          binarySize = getEvaluatedPropertyValue(allocatedSWComps(j),"TPMSProfile.SWComponent.BinarySize");
          memoryUsed = memoryUsed + binarySize;

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    Version History

    Introduced in R2020b