Analog quantity redundancy output devices and method with high reliability

Abstract

The invention relates to analog quantity redundancy output devices and method with high reliability. The devices include a device A and a device B, the device A and the device B are connected with a host through a system communication bus to communicate, the device and the device B are mutually redundant and identical, one of the devices A and B is a main device and works in a main output state, the other device is a standby device and works in a standby state, when a fault of the main device occurs, reliable switching to the standby device is carried out, and the main device works in the standby state; and the original standby device is immediately switched into a main device to continue to output, and works in a main output state. Compared with the prior art, the analog quantity redundancy output devices with high reliability have the advantages of reducing cost and improving system reliability.

Description

technical field [0001] The invention relates to the field of rail traffic dispatching, in particular to a highly reliable analog redundant output device and method. Background technique [0002] In the rail transit industry, the system is required to operate without interruption, so the system is required to have very high availability. In order to achieve high availability, systems in the industry basically adopt redundant architectures, such as two-by-two architectures or three-out architectures. Regardless of whether it is a two-by-two architecture or a three-out architecture, in principle, two or three identical modules work at the same time and output at the same time to improve the availability of the system. It is easier to perform redundant output for communication functions and digital output functions, but it is technically more complicated for redundant analog output, which requires strict detection of output status, and an independent physical switching device i...

AI Technical Summary

Problems solved by technology

[0004] 1. Real-time: An independent physical switching device is used to manage redundant analog output. Since the switching device is independent of the analog output device and does not share the same ground, it takes a long time to control the relay to switch after a fault is detected, resulting in The external output of the system is discontinuous;

[0005] 2. Flexibility: Since an independent device is used to manage the redundant analog output, considering the cost and convenience, it is a system-level switch, that is to say, when one or several channels of a system fail, all outputs are switched to Another backup system cannot achieve board-level hot backup and board-level switching;

[0006] 3. Reliability: When the redundant switching device is configured externally, the switching device is still a single point, and there is a possibility of a single point of failure. The failure of the switching device may cause the redundancy of the system to fail, affect the operation, and cause serious consequences;

[0007] 4. Cost: In order to obtain relatively high reliability when configuring redundant switching devices externally, it is necessary to use electromechanical components, resulting in increased costs;

But this invention relates to the field of network redundancy communication, which does not meet the technical requirements of this scheme

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