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|1. (WO2018137147) SELF-DIAGNOSIS METHOD FOR COMMUNICATION PROTOCOL OF SECURITY-LEVEL INSTRUMENTATION AND CONTROL SYSTEM OF NUCLEAR POWER PLANT|
|Applicants:||CHINA TECHENERGY CO., LTD.
CHINA GENERAL NUCLEAR POWER CORPORATION (CGN)
|Title:||SELF-DIAGNOSIS METHOD FOR COMMUNICATION PROTOCOL OF SECURITY-LEVEL INSTRUMENTATION AND CONTROL SYSTEM OF NUCLEAR POWER PLANT|
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.