Redundancy switching method among redundancy process control stations in distributed control system

Abstract

The invention discloses a redundancy switching method among redundancy process control stations in a distributed control system, comprising the following steps of: implementing data synchronism among the redundancy process control stations via a redundancy network; respectively connecting each process control station and each engineer station to a switchboard via a network; sending heartbeat signals to the process control station in a standby state by the process control station in an activate state; setting up a system variable by the process control station; modifying the data of the system variable by the process control station in the activate state whenever executing a control logic; synchronizing the data of the system variable to the process control station in the standby state via a private network by the process control station in the activate state when synchronizing data to the process control station in the standby state; and judging whether the data of the variable in the synchronized data is the same with the last received one or not by the process control station in the standby state and judging whether the process control station in the standby state is activated. Through the method disclosed by the invention, the reliability of switching process control stations is improved.

Description

technical field [0001] The invention relates to a reliable implementation method of redundant switching between redundant process control stations in a distributed control system, and is particularly applicable to the realization of switching between redundant process control stations in all distributed control systems. Background technique [0002] Distributed control system (distribute control system, DCS) is a new type of control system integrating control technology, computer technology, communication technology and network technology. It is characterized by decentralized control and centralized management, which distributes the control tasks of complex industrial processes to several process control stations, and realizes the centralized monitoring, operation and monitoring of the entire production process through the communication between SCADA and various process control stations. manage. [0003] The process control station is the central processing unit of the dist...

AI Technical Summary

Problems solved by technology

[0008] However, for redundant process control stations, data synchronization is a necessary function. The process control station in the "active" state must synchronize all variables to the "standby" state through a dedicated network before each round of logic execution. For the process control station, it takes a lot of time to synchronize these variables. For ordinary projects, it takes about 80 milliseconds to perform a data synchronization, which will reduce the real-time performance of the process control station.

For the process control station, the real-time performance, that is, the calculation period of the process control station is also a very important indicator. In some occasions with high real-time requirements, it is more necessary to consider its real-time performance. On this basis, if you use This dedicated network to transmit the "heartbeat" signal will reduce the real-time performance of the process control station

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