工业通信网络应用层的基本功能与要素

General Functionalities and Elements of Industrial Communication Network Application Layer

工业通信网络向网络化、数字化、智能化方向发展,已经不能被视为简单的通信网络,而是组成自动化控制系统的关键子系统。本文从应用角度,分析工业通信网络应用层的基本功能,包括周期性过程数据传输、非周期性变量读写访问、报警机制和网络/系统管理。为实现这些基本功能,工业通信协议需提供数据/变量ASE、报警ASE和管理ASE等基本应用服务元素,以及C/S、P/S和R/S通信关系。

Industrial communication networks are developing in the direction of networking,digitization and intelligence,which could not be considered as just single communication networks but as important sub-systems of the automatic control systems.From the application point of view,it analyzes the general functionalities of industrial communication network application layer,including cyclic process data transmission,acyclic read and write access to variables,alarm mechanism and network/system management.To achieve these functionalities,communication network protocol should provide various essential application service elements such as data/variable ASE,alarm ASE and management ASE,as well as Client/Server,Publisher/ Subscriber and Report source/Sink communication relationships.