Layers provided the overall architectural structure required to support a product-line development strategy by separating reusable and platform-specific software elements into different layers.
分层模式提供了支持某一产品线策略所必需的整个体系结构的结构，它将可重用和特定于平台的软件要素分离成不同的层。
Then, the requirements of the soft PLC platform are considered, and the overall structure of the system is designed based on software engineering and IEC61131-3 international standard.
然后再结合软件工程和IEC61131-3国际标准，对PLC程序开发系统进行了需求分析并设计了总体结构框架。
This dissertation began with overall design of the gateway and analyzed overall structure design, hardware platform characteristics and software design.
本论文从互联网关的总体设计入手，分析了互联网关的结构设计，硬件平台特征和软件设计。
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