Profibus现场总线技术在火电厂的应用故障诊断分析

Diagnosis and Analysis of Application Faults of Profibus Fieldbus Technology in Thermal Power Plants

某1 000 MW新建火电机组全厂设计采用基于Profibus总线技术的过程控制系统,在机组安装及调试期间,个别现场总线设备出现了无法与主站通信、总线通信不稳定以及与主站通信后无法进行远控等故障。针对这些故障进行了分类及原因分析,根据故障原因的诊断结果在总线网段设计、总线的物理层连接及总线设备与通信主站的参数设置几方面采取了相应的处理措施,同时提出了应用现场总线设备的预防性自诊断措施。该机组经过优化后的现场总线通信网络信号电压稳定且无非法报文,为现场总线控制系统的稳定运行提供了坚实的保障。

The process control system based on Profibus fieldbus technology is applied in a new 1 000-MW thermal power plant. During the stages of installation and debugging, some faults appear in the individual fieldbus devices, such as unavailable communication with the master station, unstable fieldbus communication and unavailable remote control when the communication is established. In this paper, the classification and cause analysis on these faults are conducted. Based on the diagnosis results, the treatments are carried out in the aspects of network segment design, physical connection and parameter settings. In addition, the preventative self diagnostic measures are put forward for the application of the fieldbus devices. After the optimization, the voltage of the fieldbus communication network signals has become stable without any illegal messages, which safeguards the stable operation of the fieldbus control system.