一种光纤现场总线通讯系统的分析与设计  

Design and analysis of a fiber field-bus communication system

作　　者：杨国栋[1] 梁自泽[1] 李恩[1] 范长春[1] 

机构地区：[1]中国科学院自动化研究所复杂系统与智能科学实验室,北京100190

出　　处：《高技术通讯》2009年第7期754-759,共6页Chinese High Technology Letters

基　　金：863计划(2007AA041701-1;2007AA041502)资助项目。

摘　　要：针对煤矿、机场等特殊工业现场,设计了一种基于复杂可编程逻辑器件(CPLD)和光模块的光纤现场总线通讯系统。在物理层,该系统使用光纤代替双绞线,提高了通讯的速度和抗电磁干扰能力,并通过CPLD进行信号的调制解调以及现场设备传输模式的切换,实现光电信号之间的转换,使整个通讯系统形成环形拓扑网络,提高了通讯的可靠性。在应用层,通过定义扩展帧、设置帧号和位图、使用管道技术等,提高了系统的通讯效率和准确性。技术分析表明,该通讯系统具有较实用的兼容性及可扩展性。A fiber field-bus communication system based on complex programmable logic devices （CPLD） and optical transceiver was designed for some special industrial fields such as colliery and airfields. In the physical layer of the system, fiber instead of twisted-pair was used to improve the communication efficiency and the capability of anti-electromagnetic interference, and the CPLD was used to modulate and demodulate signals, to translate digital signals to optical signals, and to switch the transmission modes of the field devices to connect the whole communication system into an annular topology, thus the communication reliability was improved. In the application layer, the extended data frame definition, the frame number and the multi-pipe technology were used to improve the communication speed and data accuracy. The technical analysis showed the compatibility and expansibility of the communication system.

关 键 词：现场总线 复杂可编程逻辑器件(CPLD) 光模块 通讯协议 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置]