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真的有工业4.0的落地的具体路径吗？我们看到了大量的解决方案，却很少能够看到从底层构建的案例。智能制造的圈内人士对于德国工业4.0的架构RAMI4.0应该是耳熟能详的，但对工业4.0的基本组成单元“工业4.0基本单元”（I4.0 compennet），却是相对陌生。然而德国产业界和学术界，正是在这个可以落地的抓手上，进行了深入的开发实践。本文从工业4.0基本单元的内涵出发，看看德国如何实际运用，以及怎么进行开发。

实体资产的“虚拟化”

为便于参考架构模型表达工业4.0的空间，RAMI采用三维模型（见图1）。纵轴分成6个层级，从不同的视角表达诸如数据映射、功能描述、通信行为、硬件/资产或业务流程。这里借用了IT行业将复杂项目划分为若干个可以管理的部分的思维。左面的横轴表达产品生命周期及其所包含的价值链，可在参考架构模型中表示整个生命周期内的相关性（例如持续的数据采集之间的相关性）。右面的横轴表达工厂的功能性和响应性，即工厂功能的分层结构。

图1：德国工业4.0参考架构RAMI4.0

Z为引人瞩目的是，RAMI将物理系统按照其功能特性，分层进行了虚拟映射。

按照IT和通信技术常用的方法，将纵轴自上而下划分为6个层级：经营业务、功能性、信息、通信、集成、资产。

资产层处于层，连同其上层集成层一起被用来对各种资产进行数字化的虚拟表达。用资产层来表达物理部件/硬件/软件/文件等实体，物理部件如直线运动的轴、金属部件、电路图、技术文件、历史记录等。

人也作为资产层的一部份，通过集成层与虚拟世界相链接。

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