变体子系统的概述

一个变体子系统块包含两个或多个儿童子系统，其中一个孩子在模型执行过程中处于活动状态。活跃的儿童子系统称为主动变体。您可以通过更改全局工作空间中变量的值或使用“变体子系统块”对话框的变量选择，通过更改变量的值来编程切换变体子系统块的活动变体。这积极的变体在模型汇编过程中通过Simulink编程与变体子系统的内部和外口块相连。金宝app

以编程方式控制变体选择，一个Simulink.Variant对象与“变体子系统块”对话框中的每个子子系统关联。Simulink.Variant对象是created in the MATLAB® global workspace. These objects have a property named健康）状况, which is an expression, that evaluates to a boolean value and is used to determine the active variant child subsystem.

笔记：You can specify variant controls in the MATLAB® global workspace, model workspace, mask workspace, or a data dictionary.

例如，定义VSS_LINEAR_CONTROLLER=Simulink.Variant('VSS_MODE==1');

in the global workspace creates aSimulink.Variantobject where the constructor argument('VSS_MODE==1')定义何时活跃。使用变体子系统对话框，然后关联VSS_LINEAR_CONTROLLERwith one of the child subsystems within the Variant Subsystem. Defining

VSS_MODE=1

在全球工作区中，激活VSS_LINEAR_CONTROLLER变体。条件参数可以是simple表达consisting of scalar variables, enumerations, equality, inequality, &&, | | , and ~. Parenthesis () can be used for precedence grouping.

Using Variant Subsystems

此示例中的模型使用以下变体对象和变体控制变量，该变量在MATLAB全局工作区中定义：

VSS_LINEAR_CONTROLLER=Simulink.Variant('VSS_MODE==1');

vss_nonlinear_controller 金宝app= simulink.variant（'vss_mode == 2'）;

VSS_MODE=2;

Opening the example modelsldemo_variant_subsystems运行预载体defined in文件 - > modelProperties->回调。This populates the global workspace with the variables for the Variant Subsystem block named Controller:

图1：这example model,sldemo_variant_subsystems

To specify theSimulink.Variant控制器子系统的对象关联，右键单击控制器子系统，然后选择Subsystem Parameters, which will open the控制器子系统块对话框。

控制器子系统块对话框指定了两个潜在变体。这两个变体又与两个变体相关联Simulink.Variant对象VSS_LINEAR_CONTROLLERandVSS_NONLINEAR_CONTROLLER在全球存在的工作区。这些objects have a property named健康）状况, an expression that evaluates to a boolean and that determines which variant is active. The condition is also shown in the Variant Subsystem block dialog. In this example, the Condition properties ofVSS_LINEAR_CONTROLLERandVSS_NONLINEAR_CONTROLLER是VSS_MODE== 1andVSS_MODE== 2, respectively. The variableVSS_MODEresides in the global workspace, and can be a standard MATLAB variable or aSimulink.Parameter。

If there is no associated variant object or a '%' (comment) character prefixes the variant object in the Variant Subsystem parameters dialog box, then the child subsystem is considered commented out and is not used during model execution.

图2：控制器子系统块的内容

在变体子系统块中，您可以放置​​Inport，Outport和子系统块。在此示例中，Linear Controller子系统块与变体对象关联，VSS_LINEAR_CONTROLLER，和非线性控制器子系统块与变体对象关联，VSS_NONLINEAR_CONTROLLER。

在变体子系统中不允许信号连接。金宝app在模拟模型时，Simulink编程将内部和外口块固定到活动变体中。

Switching Active Variants

To simulate using theLinear Controller变体，定义VSS_MODE=1在全局工作区中，然后模拟模型。

To simulate using the非线性控制器, defineVSS_MODE=2在全局工作区中，然后模拟模型。

枚举和重复使用

这sldemo_variant_subsystems_enummodel illustrates the followingSimulink.Variant功能：

1。Enumerations:MATLAB enumeration classes can be used to improve readability in the conditions of the variant object.

2。Reuse:Simulink.Variant对象可以在不同的变体子系统块中重复使用。

This example uses following variables which are defined in the MATLAB global workspace:

vsse_linear_controller 金宝app= simulink.variant（...'vsse_mode == sldemo_vss_controller_type.linear'）

VSSE_NONLINEAR_CONTROLLER=Simulink.Variant( ... 'VSSE_MODE==sldemo_vss_CONTROLLER_TYPE.NONLINEAR')

VSSE_MODE=sldemo_vss_CONTROLLER_TYPE.LINEAR

vsse_protype = 金宝appsimulink.variant（...'vsse_mode_build == sldemo_vss_build_type.prototype'）

vsse_production 金宝app= simulink.variant（...'vsse_mode_build == sldemo_vss_build_type.production'）

VSSE_MODE_BUILD=sldemo_vss_BUILD_TYPE.PRODUCTION

在这些Simulink.Variant对象, we use the enumeration classes,sldemo_vss_BUILD_TYPE.m, andsldemo_vss_controller_type.m定义Simulink.Variant健康）状况可提高可读性的参数。

三个滤镜变体子系统块，滤镜1，滤镜2和滤镜3都使用VSSE_PrototypeandVSSE_PRODUCTIONSimulink.Variant对象。

笔记：这name of the enumeration class must be unique among data type names and global workspace variable names, and is case-sensitive.

Opening the example modelsldemo_variant_subsystems_enum运行预载体defined in文件 - > modelProperties->回调。This populates the global workspace with variables for the Variant Subsystem blocks:

Figure 3:这example model,sldemo_variant_subsystems_enum

Code Generation Using Enumerated types as Variant Control Variables

You can use enumerated types to give meaningful names to integers used as variant control values.

考虑模型rtwdemo_preprocessor_subsys。

In the MATLAB Editor, define the classes that map enumerated values to meaningful names.

如果未正确定义枚举类型，将显示错误。这是几个场景，导致错误。

Invalid definition1:In this case, theSimulink.IntEnumType没有定义。

Invalid definition2:In this case, the variables are not initialized.

Enter the variant control expression as shown in the next example:

Figure 4:Block Parameters

Define the value of V in the global workspace. For example, V=2;. The value can be a normal MATLAB variable or aSimulink.Parameter目的。但是，该值不能是枚举类型。

Now generate code with变体激活时间设置代码编译。Sample code is as shown below.

Figure 5:生成的代码

有关使用的信息Simulink.VariantorSimulink.Parameter对象或MATLAB变量作为变体控制变量，请参阅Approaches for Specifying Variant Controlssection inIntroduction to Variant Controls。

有关变体子系统代码生成的更多信息，请参见嵌入式编码器文档。

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Variant System Design