溪浙特高压直流工程PROFIBUS DP通信告警分析

Analysis of PROFIBUS DP Alarm in Xizhe HVDC Project

溪浙特高压直流输电工程在调试期间频繁出现PROFIBUS DP通信误告警,该误告警由系统对报文心跳信号的检测引发。研究发现,溪浙工程的PROFIBUS DP为多环节非同步通信系统。心跳信号在多环节非同步系统的传递过程中被改变了时间窗,形成连续多帧有相同的心跳信号的报文,造成了PROFIBUS DP通信误告警。文章详细分析了心跳信号在多环节非同步系统中传递的特性,提出可行的解决方案。该研究方法对类同结构的通信系统问题分析有一定的借鉴作用。

In Xizhe HVDC project the PROFIBUS DP communication false alarm occurs frequently,which is triggered by the detection of the heartbeat signal. It is found that the PROFIBUS DP communication system is a multi-link asynchronous system. The time window of the heartbeat signal is changed by the data transfer in the multi-link asynchronous system, and the continuous multi-frame has the same heartbeat signal, which causes the false alarm of PROFIBUS DP. In this paper, the characteristics of heartbeat signal transmission in multi-link asynchronous system are analyzed in detail. The research method can be applied to similar structure commnunication systems.