Digital volume acquisition circuit with dynamic fault diagnosis ability

A technology for collecting circuits and diagnosing faults, which is applied to electrical signal transmission systems, instruments, signal transmission systems, etc., and can solve problems such as damaged systems

Active Publication Date: 2017-08-18
CHINA NUCLEAR CONTROL SYST ENG
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  • Abstract
  • Description
  • Claims
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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.

Method used

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  • Digital volume acquisition circuit with dynamic fault diagnosis ability

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Embodiment Construction

[0025] The description of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, the digital quantity acquisition circuit is applied to a nuclear power safety level DCS system, including an optocoupler signal acquisition circuit and a photorelay dynamic diagnosis circuit;

[0027] The optocoupler signal acquisition circuit is applied to a dual FPGA architecture system, wherein one channel is connected to process the FPGA, and the channel includes the second resistor R2, the seventh resistor R7 and the fourth resistor R4 and the fourth diode in the optocoupler OA1 Tube D4 and the first transistor Q1; another channel is connected to the diagnostic FPGA, this channel includes the third resistor R3, the eighth resistor R8 and the fifth resistor R5, and the fifth diode D5 and the second and third resistors in the optocoupler OA1 Pole tube Q2;

[0028]The photorelay...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/048G08C19/36
CPCG05B19/048G08C19/36
Inventor 冷强王冬
Owner CHINA NUCLEAR CONTROL SYST ENG
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