A digital acquisition circuit with dynamic fault diagnosis capability

Abstract

The present invention provides a digital volume acquisition circuit with dynamic fault diagnosis ability. A dynamic read-back signal is used to achieve more complete channel self diagnosis. The circuit is applied to a nuclear grade DCS system and comprises an opto-coupler signal acquisition circuit and an optical relay dynamic diagnosis circuit. The opto-coupler signal acquisition circuit is applied to a dual FPGA architecture system, one channel is connected to a processing FPGA, and the other channel is connected to a diagnosis FPGA. According to the fault diagnosis of the invention, the judgment is carried out according to a condition whether a read square wave can be received, after the FPGA reads a condition that a channel is in a power or loss of power state from an optocoupler output end, a dynamic diagnosis test is carried out, corresponding high and low level pulses can be read, and passed diagnosis is judged. According to the circuit of the invention, whether the digital volume acquisition circuit collects a fault can be judged, and state information can be uploaded in real time.

Description

technical field [0001] The invention belongs to the field of industrial control, and in particular relates to a digital quantity acquisition circuit with dynamic fault diagnosis capability. Background technique [0002] In the field of industrial control, nuclear power DCS system is an important branch. The nuclear power DCS system will specially design corresponding modules for the digital signal input from the site to the DCS system, such as temperature, pressure limit switch, motor operating status, ready signal, fault signal, local / remote switching signal and other important signal inputs. Then the collected signal is sent to the control station for processing. Due to the characteristics of nuclear power plants, on-site signals need to be isolated from the DCS system to ensure that the safe operation of the entire main control station will not be affected in the event of a special damage to a certain part. At present, the most widely used and relatively stable scheme f...

AI Technical Summary

Problems solved by technology

However, it is still unavoidable that if the two-channel optocoupler is damaged at the same time, the system cannot be judged.

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