A fail-safe output method based on safebus

Abstract

The invention discloses a fail-safe output method based on a SAFEBus bus, which belongs to the technical field of electronic circuits. The steps of this method are as follows: Step 1, the BIU module of the master node reads the discrete input control signal from the SAFEBus bus; Step 2, the BIU modules of the X branch and the Y branch compare the discrete quantity control; Step 3, confirm the control After the signal is consistent, it is transmitted to the next-level FPGA module; Step 4, the FPGA module generates a square wave and transmits it to the output circuit module; Step 5, the output circuit module modulates the square wave and outputs it to the outside and wraps it to the discrete acquisition module; Step 6 , the FPGA module reads the output signal in the discrete quantity acquisition module, and compares the input and output signals; Step 8, only when the input and output signals correspond, continue to the next stage of the task. Aiming at the influence of a single fault, the present invention adopts combined technology, inherent fault technology, and reactive fault technology to avoid fault modes and greatly improve the safety of signal output.

Description

technical field [0001] The invention discloses a fail-safe output method based on a SAFEBus bus, which belongs to the technical field of electronic circuits. Background technique [0002] Most of the current safety control systems are computer control systems. Once the control system fails to work normally, it may output dangerous control signals to the controlled equipment, thereby causing casualties and property losses. Currently, fail-safe output is common in the railway field. The structure has two out of two, three out of two structures, and generally only uses combined fail-safe technology, and the safety measures are relatively single, lacking multiple guarantees. Contents of the invention [0003] The purpose of the present invention, in order to improve the safety of train control vehicle-mounted safety computer platform architecture at the present stage, the present invention proposes a kind of fail-safe output method based on SAFEBus bus. [0004] Technical sch...

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Problems solved by technology

[0002] Most of the current safety control systems are computer-controlled systems. Once the control system fails to work normally, it may output dangerous control signals to the controlled equipment, thereby causing casualties and property losses. Currently, fail-safe outputs are common in the railway field. The structure has two out of two, three out of two structures, and generally only uses combined fail-safe technology, and the safety measures are relatively single, lacking multiple guarantees

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