在使用Proteus仿真单片机系统的过程中，经常找不到所需的元件，这就需要自己编写。Proteus VSM的一个主要特色是使用基于DLL组件模型的可扩展性。这些模型分为两类：电气模型（Electrical Model）和绘图模型（Graphical Model）。电气模型实现元件的电气特性，按规定的时序接收数据和输出数据；绘图模型实现仿真时与用户的交互，例如LCD的显示。一个元件可以只实现电气模型，也可以都实现电气和绘图模型。-SCM system using the Proteus simulation process, often can not find the necessary components, which need to write your own. A key feature of Proteus VSM is the DLL-based component model scalability. These models fall into two categories: electrical model (Electrical Model) and drawing model (Graphical Model). Electrical components of the electrical characteristics of model implementation, the timing required to receive data and output data　graphics simulation model to achieve the interaction with the user, such as LCD display. A component can only achieve electrical model can also have electrical and mapping models realization.