A safety platform input consistency comparison method based on a 2*2-out-of-two architecture
A secure platform and consistent technology, applied in the architecture with a single central processing unit, multi-programming devices, inter-program communication, etc., can solve the problems of increasing the processing burden of upper-layer applications, limiting the number of messages, and existing security risks. Prevent mis-throwing, improve efficiency, and improve continuous effect
Active Publication Date: 2019-05-10
CASCO SIGNAL
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Problems solved by technology
[0003] However, the introduction of dual systems and the addition of logical operation boards have also increased the difficulty of checking the consistency of input messages, not only the consistency comparison within a single system, but also the consistency comparison between two systems, and the setting of comparison principles depends on the actual situation
The slight deviation in the timing of receiving input messages by multiple logic operation boards may cause the received messages to be different. If there is a difference, all discarded messages will cause valid data to be lost, and all these messages are selected to be sent to the upper application. On the one hand, it will increase the processing burden of upper-layer applications, and at the same time, there will be security risks
The requirements of the upper-layer application for the input message sent by the logic operation board are: to ensure the reliability and continuity of the message, unreliable messages can be discarded, but there is a certain limit on the number of discarded messages
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[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0031] figure 1 It is a structural relationship diagram between each board involved in the present invention, and the trackside safety platform includes main and standby systems: A series (A machine), B series (B machine), and each system includes two logic processing boards CPU1_A , CPU2_A, CPU1_B, CPU2_B. The logic operation board receives external input messages from the communication board. The security platform can be run in a single system or in a ...
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The invention relates to a safety platform input consistency comparison method based on a 2 * 2-out-of-two architecture. According to the method, comparison of actual input messages is converted intocomparison of message index serial numbers, comparison of the message index serial numbers is further converted into comparison of only the message start-stop index serial numbers, and finally messages needing to be sent to an upper-layer application are obtained by combining a recorded lost message sequence. Compared with the prior art, the method has the advantages of simplifying logic, improving efficiency and the like.
Description
technical field [0001] The invention relates to a wayside safety platform, in particular to a safety platform input consistency comparison method based on a 2 by 2 out of 2 architecture. Background technique [0002] The trackside safety platform is a general-purpose SIL4-level safety computer system, which can be used as trackside safety equipment for subways and railways in conjunction with upper-layer applications, such as area controllers, interlocks, train control, trams, etc. The trackside safety platform involved in the present invention adopts a 2 by 2 security architecture, a main machine (main system) and a backup machine (backup system) constitute a 2 by 2, and the main machine and the backup machine each include two logical operation boards The card realizes 2 out of 2. The input message must go through the 2-out-2 consistency comparison within the system and the consistency comparison between the main and standby machines before it can be sent to the upper laye...
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IPC IPC(8): G06F15/78G06F9/54
Inventor 张磊郭盟周庭梁张辉董高云瞿玲燕方永佳
Owner CASCO SIGNAL