A 2 by 2 take 2 redundant structure data processing method

Abstract

The present invention provides a method for processing data with a 2 by 2 redundant structure, including single system redundancy and safety verification processing steps, performing time stamp redundancy processing and safety verification on data received by dual channels, and The valid data that has passed the verification increases the corresponding timestamp information and sends it to another system; the interaction and logic processing steps of the active and standby dual systems determine whether the current cycle data packet timestamp is greater than the previous cycle data packet timestamp, and perform this system based on the judgment result. Data Update. The present invention first performs redundant time stamp processing, and then performs safety verification to prevent reverse order phenomenon.

Description

technical field [0001] The invention relates to the technical field of equipment redundancy, in particular to a method for processing 2 by 2 redundant structure data. Background technique [0002] Equipment redundancy technology is an important technical measure taken to ensure that important system equipment does not stop running. With the development of redundancy technology, the signal system has developed from dual-machine hot standby to two-out-of-three and two-by-two. Especially the two-by-two redundant structure is widely used in railway signal equipment, computer equipment and other fields due to its advantages of high safety, good reliability, and low cost. [0003] Take the two-by-two-out-of-two system redundant design scheme of the existing train control center TCC (hereinafter referred to as TCC) and the interlocking CBI, temporary speed limit server TSRS or adjacent station TCC’s Ethernet interface as an example, as follows: figure 1 As shown, the TCC receives ...

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Problems solved by technology

[0008] However, the existing two-by-two redundancy scheme performs independent security checks on the dual channels (A, B) in each system of the primary and backup TCC systems, and does not perform security checks on the application data packets that pass the checks on both channels. Safe timestamp comparison, which may cause reverse order when switching channels to use input data

[0009] The same problem also occurs when the verification used in the current cycle of the interaction between the active and standby TCC dual systems passes the input data. Since the security time stamp comparison is not performed, when the system switches between using its own received data and the data exchanged by other systems , there may be a phenomenon of reverse order

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