中图分类号：TN918；TP391.4 文献标志码：A DOI: 10.16157/j.issn.0258-7998.244915
中文引用格式： 白西让. 一起DCS网络异常事件分析研究[J]. 电子技术应用，2024，50(5)：47-52.
英文引用格式： Bai Xirang. Analysis and research on a DCS network abnormal event[J]. Application of Electronic Technique，2024，50(5)：47-52.

Analysis and research on a DCS network abnormal event

Abstract： One thermal power plant experienced an abnormal event where all controllers were restarted due to a DCS network failure, resulting in unplanned shutdown of the generator set. This article provides a review of the handling and investigation for this incidents. Through simulation testing, log analysis, on-site inspection, and other methods, the cause of network failure was identified as a unidirectional fiber optic link failure between the aggregation switch and an access switch.A detailed analysis was conducted on this fiber optic unidirectional link failure event. This network failure can provide a reference for the daily maintenance and accident prevention of DCS with similar network architectures.

Key words : DCS network；network loop；MAC address flapping