Method and device for synchronizing data in multiple redundant control systems
A control system, multiple redundancy technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as inconsistency of module data, inconsistency of key variable data, inconsistency of controller key variable data, etc., to reduce data overhead Influence and improve the effect of correctness
Active Publication Date: 2021-05-25
ZHEJIANG SUPCON TECH
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[0003] However, in multiple redundant control systems, the data of key variables in each independent controller may be inconsistent
For example, the key variable data accumulated inside the controller may change with the running time of the controller. If the frequency of the crystal oscillator between the controllers is different or some controllers are unexpectedly reset, it is likely to cause the control Inconsistency of key variable data between controllers, or data inconsistency between modules, which reduces the reliability, security and availability of multiple redundant control systems
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[0056] In the process of using multiple redundant control systems to monitor the safety of industrial production, each controller in the multiple redundant control system is the same and independent of each other, which requires that the control cycles of each controller must not only be synchronized, but also the Local data is also synchronized. For example, for the data collected by the I / O (Input / Output, input / output) card of each controller, the internally accumulated key variable data, etc., especially the internally accumulated key variable data of each controller, it is usually created by the user. , and may change with the running time of the controller from the creation, even if the control cycle synchronization of each controller is guaranteed, it may be due to the difference in crystal oscillator frequency in each controller, or because of an accident in a certain controller reset and other situations, which leads to the inconsistency of key variable data between co...
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The embodiment of the present application discloses that the present application provides a method and device for synchronizing data in a multiple redundant control system. The method includes: for each controller in the multiple redundant control system, according to the obtained first local fault level Information and fault level information of other controllers to determine the first priority module, and at the same time, local data and local data of other controllers can be obtained, and local data of the controller in the first preferred module can be determined from the obtained local data. Then it can use the local data of the controller in the first preferred module to update its own local data. It can be seen that the local data of the controller in the first preferred module is then used to update its own local data, so that the updated local data of each controller will also be consistent, thereby realizing the synchronization of the local data of each controller .
Description
technical field [0001] The present application relates to the technical field of control security, in particular to a method and device for synchronizing data in multiple redundant control systems. Background technique [0002] In important industrial production processes, it is usually necessary to control the safety of the industrial production process. Compared with single-core control systems, multiple redundant control systems often have higher reliability, security and availability. For example, for a triple redundancy control system, its output data is usually voted in two out of three. In this way, even if a failure of a single controller results in no output data or output error data, the triple redundant control system can still output correct results due to the existence of other redundant controllers. Moreover, in the triple redundant control system, when switching between the master module and the slave module, even if the controller in the master module fails...
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IPC IPC(8): G05B9/03
CPCG05B9/03
Inventor 刘志勇董乾钦裘坤陆卫军
Owner ZHEJIANG SUPCON TECH