公共对象层管理网络服务对象，访问现场总线设备，元件层实现不同现场设备间的互操作。
Networks service object was managed, and the field bus equipments were visited with public target layer. The inter-operation among different equipments was realized with component layer.
主要是提供现场层和应用软件间的纵向的数据集成和互操作。
OPC Data Access (DA) primarily provides vertical data integration and interoperability between measurement and automation systems on the manufacturing floor and client application.
主要是提供现场层和应用软件间的纵向的数据集成和互操作。
OPC Data Access (DA) primarily provides vertical data integration and interoperability between measurement and automation systems on the manufacturing floor and client application.
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