Output data smooth switching method based on double 2-vote-2 security platform

Abstract

The invention provides an output data smooth switching method based on a double two-out-of-two security platform, the double two-out-of-two security platform comprises a master system and a slave system which are in communication connection, and the master system and the slave system are both in communication connection with external equipment and can send output data to the external equipment from a data storage module in communication connection; the data storage module comprises output data of a plurality of periods, each period comprises a plurality of pieces of output data, and the method comprises the following steps: step S1, defining a serial number for each piece of output data in each period; s2, initializing a smooth switching task; s3, the master system sends output data to the external equipment and sends a smooth switching message containing an output data serial number to the slave system; and S4, the slave system judges whether to execute a smooth switching task or not according to whether the smooth switching message sent by the master system is received or not. The method has the advantages of high transmission efficiency, good transmission stability and accurate transmission data.

Description

technical field [0001] The invention relates to the field of rail transit signal transmission, in particular to a method for smooth switching of output data based on a two-by-two-out-two safety platform. Background technique [0002] The two-by-two safety platform is a typical safety platform structure widely used, which can meet the high security and high real-time requirements of the rail transit signal control system. The two-by-two security platform adopts a dual-system redundant system structure. The dual-system operates in a master-slave manner, including the master system and the slave system. When any system detects a fault or artificially shuts down, the master-slave system can be switched. Each system of the security platform contains two independent security CPU units, and the platform can only output to the outside world when the two CPUs of each cycle are consistent. [0003] During the operation of the two-by-two security platform, the master-slave switch will...

AI Technical Summary

Problems solved by technology

Master-slave control switching is often a major cause of external communication disruptions

Due to the uncertainty of the failure point of the master system, if the master system fails during data output and the original slave system is converted to the master system, the messages that were not output by the original master system in the current period will be lost, resulting in communication delays or even interruptions , which reduces the availability of the system

In order to overcome the communication problem during the master-slave conversion process, the existing technology is that the platform uses the master-slave system to output data at the same time. Although this method avoids communication delay or interruption during the master-slave conversion process, it increases unnecessary communication redundancy. and data processing difficulty

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