Method for data semi-dynamic synchronization between master and standby controllers of rail transit system
A technology of rail transit and backup controller, applied in general control system, program control, computer control and other directions, to achieve the effect of automatic switching, seamless takeover and high application value
Inactive Publication Date: 2019-07-09
SHANGHAI ELECTRIC THALES TRANSPORTATION AUTOMATION SYST CO LTD
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But at the same time, it also puts forward higher requirements for the application program, operating system and hardware platform of the controller: the resource requirements for transmission data flow, calculation complexity, historical data storage for fault rollback, CPU (central processing unit) occupancy rate, etc. The requisition has been greatly increased, which has a greater impact on the control system with high real-time requirements (especially the safety controller with a large amount of calculation and limited scalability such as hardware replacement) in terms of availability.
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[0018] The present invention will be further described below in conjunction with accompanying drawing.
[0019] see figure 1 , the semi-dynamic data synchronization method between the active and standby controllers of the rail transit system of the present invention comprises the following steps:
[0020] Step S1, at the beginning of each calculation cycle, the active controller transmits the received external command data to the standby controller in one direction. Specifically, the present invention determines the active and standby roles of the controllers in advance at the design stage, and determines the active and standby roles of the redundant system through hardware default writing or software default configuration at the system initialization stage, thus avoiding dual The system may encounter problems such as mutual confirmation, repeated handshakes, repeated switching, and deadlocks caused by design defects in the active and standby dynamic allocation at the beginni...
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The invention discloses a method for data semi-dynamic synchronization between master and standby controllers of a rail transit system. The method comprises the following steps: at the beginning of each calculation period, the master controller transmits received external command data to the standby controller in a one-way mode; the standby controller sends a synchronization confirmation state code to the master controller according to a received external command; the master controller and the standby controller simultaneously perform real-time calculation based on the external command data; and the standby controller does not perform output, and the master controller performs output, delay output or security side output according to a synchronization confirmation state of the standby controller. The master and standby controllers perform the real-time calculation, only the master controller sends the original external command to the standby controller in a one-way mode, and only the standby controller sends the synchronization confirmation state code to the master controller, so that the master and standby controllers are prevented from periodically and massively transmitting thedata, relatively numerous CPU, memory and network resources are saved, and the contradiction between higher real-time calculation requirements of a real-time control system and limited expansibility of hardware and operation system upgrading and the like of operation equipment is solved.
Description
technical field [0001] The invention relates to the field of rail traffic control, in particular to data synchronization technology between active and standby controllers. Background technique [0002] Dynamic synchronization between controllers in the field of rail transit, such as: input and output data synchronization, logical operation data synchronization, transmission mirroring and other technologies make automatic switching and seamless takeover between systems possible. But at the same time, it also puts forward higher requirements for the application program, operating system and hardware platform of the controller: the resource requirements for transmission data flow, calculation complexity, historical data storage for fault rollback, CPU (central processing unit) occupancy rate, etc. The requisition has been greatly increased, which has a greater impact on the control system with high real-time requirements (especially the safety controller with a large amount of ...
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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/24182G05B2219/25033
Inventor 孙来平李广诚黄雷夏哲
Owner SHANGHAI ELECTRIC THALES TRANSPORTATION AUTOMATION SYST CO LTD