基于PLC的网关通信研讨

Research on Gateway Communication Based on PLC

工业以太网作为控制系统网络化发展的新方向,也逐步渗入工业控制网络,所以标准多元化的现场总线与工业以太网共存的局面将长期存在。本文对异构网络间互联通信机制进行了深入研讨,并对各个机制存在的一些问题,比如开发成本高、扩展性和移植性差的现象进行了分析。在对协议转换网关的工作机制进行详细分析的基础上,提出了基于嵌入式中间件协议库的协议转换网关。利用分层思想和软件复用技术,设计协议库的可扩展性和易移植性;对协议库进行层次化、组件化,定义了嵌入式中间件协议库组件化的原则和粒度控制;并利用共享内存技术实现数据信息的交换。最后,设计并开发了基于易移植、可扩展嵌入式协议转换网关,实现多协议间的互联通信。

Industrial Ethernet, as a new direction of network development of control systems, has gradually penetrated into industrial control networks, so the standard The coexistence of quasi-diversified fieldbus and industrial Ethernet will exist for a long time. In this paper, the interconnection communication mechanism between heterogeneous networks is deeply studied, and some problems existing in each mechanism, such as high development cost, scalability and poor portability, are analyzed. Based on the detailed analysis of the working mechanism of the protocol conversion gateway, a protocol conversion gateway based on the embedded middleware protocol library is proposed. The layered idea and software reuse technology are used to design the scalability and portability of the protocol library. The protocol library is hierarchical and componentized, and the principle and granularity control of the component library of the embedded middleware protocol library are defined. Shared memory technology enables the exchange of data information. Finally, the design and implementation of a portable, scalable embedded protocol conversion gateway based on multi-protocol interconnection communication.