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1. (WO2018137147) SELF-DIAGNOSIS METHOD FOR COMMUNICATION PROTOCOL OF SECURITY-LEVEL INSTRUMENTATION AND CONTROL SYSTEM OF NUCLEAR POWER PLANT

Pub. No.:    WO/2018/137147    International Application No.:    PCT/CN2017/072495
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Wed Jan 25 00:59:59 CET 2017
IPC: H04L 12/24
Applicants: CHINA TECHENERGY CO., LTD.
北京广利核系统工程有限公司
CHINA GENERAL NUCLEAR POWER CORPORATION (CGN)
中国广核集团有限公司
Inventors: JIANG, Guojin
江国进
WANG, Jingwei
王静伟
ZHANG, Chunlei
张春雷
ZHANG, Zhihui
张智慧
JIN, Chengri
金成日
GAO, Chao
高超
MA, Zhaoyang
马朝阳
MA, Guangqiang
马光强
Title: SELF-DIAGNOSIS METHOD FOR COMMUNICATION PROTOCOL OF SECURITY-LEVEL INSTRUMENTATION AND CONTROL SYSTEM OF NUCLEAR POWER PLANT
Abstract:
Provided is a self-diagnosis method for a communication protocol of a security-level instrumentation and control system of a nuclear power plant. The method is realized by means of the steps of, based on a point-to-point network protocol composed of an application layer, a data link layer and a physical layer, a sender acquiring a destination MAC, a source MAC and upper-layer data, and packaging and sending the acquired upper-layer data in a frame format; detecting a destination MAC and a source MAC of a data frame to diagnose an error address; determining a TICK and a message serial number of the data frame; using a CRC check code of the data frame to detect and diagnose a data corruption error; when the error is diagnosed to be time-out delay, performing fault diagnosis and fault recovery, etc. By means of the self-diagnosis method in the present invention, the diagnosis of eight types of network errors is fully covered, and it is ensured that erroneous data is not misused. A reasonable tolerance threshold value of the number of network diagnosis fault times is set, so that the stability of the system is ensured, and a determined network fault is reported at the first time, thereby effectively ensuring the point-to-point communication quality of a security-level instrumentation and control system of a nuclear power plant.