Rail transit safety acquisition and power-on self-test system

Abstract

The invention discloses a rail transit safety acquisition and power-on self-test system. The system comprises an FPGA control circuit, a power supply input unit, a voltage division circuit, a diode D1, a diode D2, an input isolation circuit, a comparison circuit, a photoelectric isolation circuit and a detection isolation circuit. A detection pulse input signal is input to the diode D1, a power-onself-test signal is input to the diode D2, and a test signal carrier is input to the input isolation circuit; the output ends of the diodes D1 and D2 are connected with the input isolation circuit, the output end of the input isolation circuit is connected with the input end of the comparison circuit, the output end of the voltage division circuit is connected with the input end of the comparisoncircuit, and the output end of the comparison circuit is connected with the input end of the photoelectric isolation circuit. And the output end of the photoelectric isolation circuit is connected with the detection isolation circuit. The system has the advantages that a normally high or normally low static signal is converted into a dynamically changing square wave signal, so that the detectionfailure risk of a fault signal is reduced.

Description

technical field [0001] The invention belongs to the field of rail transit computer communication, and in particular relates to a rail transit safety collection and power-on self-inspection system. Background technique [0002] In recent years, my country's rail transit construction has embarked on the road of rapid development. The safety of the rail computer platform has always been the top priority of the rail transit technology. It is to accurately switch to the safe side in the non-safety mode, and design a safe and effective information collection and power-on self-inspection system to realize the power-on self-inspection of the whole system after power-on, which is of great significance to the safe and smooth operation of rail transit. [0003] In the commonly used rail transit information acquisition system, digital acquisition devices are used to directly detect the digital quantity of the detected signal, which requires the digital detection device to have high relia...

AI Technical Summary

Problems solved by technology

[0003] In the commonly used rail transit information acquisition system, digital acquisition devices are used to directly detect the digital quantity of the detected signal, which requires the digital detection device to have high reliability. A fault may lead to an error in the detection state. In the wrong state, it is impossible to switch to the safe side in time without knowing it, which can easily lead to system failure.

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