Self diagnosis system and method based on channels of FPGA analog input device

Abstract

The invention discloses a self diagnosis system based on channels of an FPGA analog input device. The self diagnosis system is connected with an analog input device and comprises an FPGA processing unit, an acquisition AD channel, a self diagnosis DA channel and an isolation cell; the FPGA processing unit is connected with the acquisition AD channel and the self diagnosis DA channel, the acquisition AD channel comprises an analog switch, an A / D converter and an isolation unit which are sequentially connected; and the self diagnosis DA channel comprises a D / A converter and an isolation unit. The invention also discloses one self diagnosis method of the self diagnosis system based on the channel of the FPGA analog input device, self diagnosis of a 16-channel analog quantity acquisition channel is realized in parallel, and time cost is reduced. Reliability is high, full-channel and full-code-value parallel detection is realized, and all the channels of the input device do not acquire an external signal on site when self diagnosis operation is carried out. Electrical security is high, and data processing function and the channels of the input device realize electric isolation.

Description

technical field [0001] The invention relates to the technical field of FPGA, in particular to a self-diagnosis system and method based on an FPGA analog input channel. Background technique [0002] FPGA (Field-Programmable Gate Array) field programmable logic gate array, a hardware programmable integrated circuit. [0003] The analog input device is an essential part of the distributed control system of the nuclear power plant, and it is mainly responsible for collecting the external sensor signals from the field. In addition to requiring high precision when the analog input device collects the sensor signal, due to the particularity of its working environment, it is vulnerable to external interference and other factors, so it is imminent to improve the reliability of the analog input device, and high reliability design has become It is a crucial part of the analog quantity input device of the nuclear power plant. [0004] At present, there have been researches on the self...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the slow speed and high time cost of the polling self-diagnosis method; it is necessary to wait for the completion of the full-channel detection before performing normal acquisition work. At this time, except for the last self-diagnosis channel, the rest of the self-diagnosis channels do not have real-time performance; The harsh environment of the industrial site may affect the processor and other issues

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