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将模块分组为功能子系统，创建模型层次结构

随着模型的大小和复杂度的增加，您可以通过将模块组合为子系统来简化它。子系统是组合为一个 subsystem 模块的一组模块。

使用子系统，您可以：

当您创建子系统的副本时，该副本将独立于源子系统。要在一个模型范围内或跨多个模型重用子系统的内容，请考虑引用子系统、引用模型或链接到自定义库中某个模块的子系统。有关详细信息，请参阅。

子系统可以是虚拟的，也可以是非虚拟的。虚拟子系统提供模型中的图形层次结构。非虚拟子系统提供模型的图形层次结构并作为单个单元来执行。

模块

对各模块进行分组以创建模型层次结构

	创建包含指定模块集的子系统
	将图形内容从系统复制到空子系统
	replace subsystem with subsystem contents
	将子系统转换为模型引用
	将图形内容从子系统复制到空系统
	删除子系统的内容

	converts all subsystem reference blocks to regular subsystem blocks
	converts a subsystem reference block to a regular subsystem block
	converts a subsystem block to subsystem reference
	returns all the active instances of subsystem references
	returns child subsystem block diagrams that are referred in the given block diagram and are also being edited
	returns all subsystem reference blocks inside a block diagram
	returns all the child subsystem block diagrams for a given block diagram
	returns the nearest parent subsystem reference for a block
	returns the system that has acquired the lock for editing
	checks if the system is locked due to an edit or update to the subsystem reference

	convert subsystems to referenced models
	view, save, and close referenced subsystems and models

save a subsystem in a separate file and reference it in a model.
use subsystem reference in a model.
this example shows how to dynamically change the subsystem reference component using the initialization function.