JPH03248095A - Diagnosing device for electronic circuit - Google Patents

Abstract

PURPOSE:To support identification of a failure origin and to judge the failure origin within a region of each board by providing a knowledge storing mean of object system constitution, a knowledge storing mean of diagnosing procedure, a preparation mean of diagnosing procedure, a selection mean of probable failure origins, a judgement mean of failure origin and so on. CONSTITUTION:At a knowledge storing mean 1 of object system constitution, constitutional knowledge consisting of knowledge about the object system constitution (names, connecting relationship and so on of circuits constituting a system controlling system), which enables identification of failure origins separately for each system, is stored separately. A knowledge storing mean 2 of diagnosing procedure stores knowledge regarding diagnosing procedure peculiar to the object and consisting of inspection condition such as inspection procedure, separately for each system and for each failure identification unit. The stored contents of both means 1 and 2 are fed to a preparation mean 4 of diagnosing procedure, along with input informations from an input mean 3 feeding informations of current situation of the system, and the like. A selection mean 5 of probable failure origins selects the probable failure origins for each identification unit of failure origin, and the they are stored in a storing mean 6 of candidate failure origins, with relation to a situation pattern corresponding to inspection signals. A judgement mean 7 of failure origin judges whether the situation pattern of inspection signals is stored in the mean 6 or not, when the pattern from the mean 3 is fed.

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) The present invention is intended for use in cases where a failure occurs in an electronic circuit that constitutes a control system of a large-scale plant such as a nuclear power plant, a thermal power plant, or a chemical plant. The present invention relates to an electronic circuit diagnostic device that assists operators in identifying failure sources.

(Prior Art) When a failure occurs in an electronic circuit constituting a control system of a large-scale plant, the plant may be affected in some cases. In such a case, if the location of the failure in each panel or even in each circuit board, which is a replaceable unit, is known, prompt action can be taken.

In the past, plant operators and maintenance personnel checked the plant's process volume and equipment status in the central control room, etc. to understand abnormal conditions, and based on their experience and related manuals, they determined the structure and control of the plant. Knowledge about the system configuration is used to determine the source of failure in electronic circuits. In particular, maintenance/repair should be carried out based on the current plant condition, blocks that may be the cause of the failure (
board, etc.), and finally find a unit that can be replaced on site (
For example, the source of failure is determined on a board-by-board basis.

(Problem to be solved by the invention) However, because the plant structure itself is complex and large-scale, humans have to check numerous process quantities and equipment conditions, understand abnormal conditions, and assume all possible sources of failure. It is not easy to do so, and it is difficult to examine each possible fault source calibration one by one and determine the fault source from the current situation to the actual faulty block and replaceable unit (board). Have difficulty.

Even if the faulty block can be determined, maintenance/
In order for the repair tool to determine the failure location on a board-by-board basis, it is necessary to examine a huge amount of drawing data, sequence diagrams, or related manuals related to the circuit system of the plate at the site, and to understand their configuration and normal output. It is necessary to know everything thoroughly, and the burden of doing so becomes excessive and there is a risk of misjudgment.

Therefore, some companies register all circuit connections and drawing data as a knowledge base, and use desktop or disk-side computers to provide maintenance personnel with the relevant drawing data and system processing details. Systems have been developed to display and determine the source of the failure. However, because the scale of the entire system is not portable, the information collected at the site using a carrying terminal, etc. must be manually collected all at once later, and maintenance personnel are unable to obtain the information necessary for diagnosis at any time. There is.

The present invention has been made in consideration of these points, and is designed to prevent operators, maintenance/repair equipment, etc. It is an object of the present invention to provide an electronic circuit diagnostic device that can support the identification of failure sources by a board unit or even a replaceable unit (for example, a board unit).

[Structure of the invention]

(Means for Solving the Problems) As a means for achieving the above object, the present invention provides configuration knowledge consisting of names, connection relationships, and drawing data of electronic circuits constituting the control system of a system for each system and in units of fault source identification. Target system configuration knowledge storage means that is stored separately, and diagnostic procedure knowledge that stores knowledge about target-specific diagnostic procedures consisting of data on inspection procedures and inspection signal status during normal conditions, separately for each system and failed V4 source identification unit. A storage means, an input means for inputting information about the current state of the system, and drawing data to be diagnosed and a diagnosis procedure are generated for each fault source identification unit in accordance with the input information from the human power means based on the memory contents of both storage means. a diagnostic procedure generation means; a fault source candidate selection means for selecting a fault source candidate in a fault source identification unit based on knowledge of circuit connection relationships from the state of the inspection signal of the system normally checked by the inspection H; a fault source candidate storage means for storing the fault source candidates in association with a state pattern of a corresponding inspection signal; and a state pattern of the inspection signal inputted from the input means is stored in the fault source candidate storage means. If it is stored, the corresponding fault source candidate is selected, and if it is not stored, the fault source candidate is identified based on the knowledge about the connection relationship of the circuit. It is characterized in that it is provided with a fault source determination means that selects the fault source candidates in units and stores the selected fault source candidates in the fault source candidate storage means.

(Function) In the electronic circuit diagnostic device according to the present invention, the failure source pattern correction is registered in advance in association with the status pattern of the system inspection signal that is normally checked by the inspector, and the inspection is performed manually in the event of a failure. Based on the signal state pattern, it is determined whether or not a corresponding failure source candidate is registered.

If the fault source candidate is registered, the fault source candidate is determined as the actual fault source, whereas if it is not registered, the fault source candidate is determined based on pre-stored knowledge of the connection relationship of the circuit. selected and determined as the actual source of the failure. This failure source candidate is newly registered for use when a similar failure occurs later.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram 9 showing an example of an electronic circuit diagnostic apparatus according to the present invention, and in the figure, reference numeral 1 denotes target system configuration knowledge storage means.

The target system configuration knowledge storage means 1 stores knowledge regarding the configuration of the target system, such as configuration data including names, connection relationships, and drawings of the electronic circuits that configure the system control system, and identifies failure sources by system to be diagnosed. Diagnosis procedures unique to the target system consisting of inspection procedures and data on inspection signal status during normal operation are stored separately in each possible unit (system functional block unit, panel unit, board unit, etc.). The knowledge regarding diagnostic procedure knowledge storage means 2
The information is stored separately by system to be diagnosed and by failure source identification unit. Both storage means 1
．． The stored contents of 2 are input to the diagnostic procedure generating means 4 together with the input information from the input means 3 for inputting information on the current status of the system.

As shown in FIG. 1, this diagnostic procedure generating means 4 generates drawing data to be diagnosed and a diagnostic procedure based on the stored contents of both the memory means 1 and 2 and the input information from the input means 3. It is designed to be generated in source identification units.

On the other hand, the fault source candidate selection means 5 shown in FIG. The selected fault source correction is stored in the fault source candidate storage means 6 in combination with the corresponding inspection signal state pattern. The stored contents are used when the fault source determining means 7 determines the fault source.

That is, the failure source determination means 7, as shown in FIG.
When a state pattern of an inspection signal is input from the input means 3, it is first determined whether or not this state pattern is stored in the fault source candidate storage means 6, and if it is stored, , the corresponding fault source candidate is selected and determined as the actual fault source.

On the other hand, if it is not stored, as shown in Figure 1, a fault source candidate is selected in the fault source identification unit based on the knowledge of the connection relationship of the circuit, and this is determined as the actual fault source. This failure source candidate is stored in the failure source pattern correction storage means 6 in combination with the corresponding inspection signal status pattern for use in subsequent diagnosis. .

FIG. 2 is a functional configuration diagram showing the electronic circuit diagnostic device using an expression method.
, a diagnostic procedure knowledge base 12 , a target system configuration knowledge base 13 , an inference section 14 , a working storage section 15 , a diagnosis result storage section 16 , and an interaction processing section 17 .

As shown in FIG. 2, the knowledge base conversion unit 11 converts the names and connections of electronic circuits that make up the plant control system, which operators and maintenance/repair tool inspectors 18 have learned from experience and manuals. Knowledge about the configuration of the target system, such as configuration data including relationships and drawings, and knowledge about the diagnostic procedure specific to the target, which consists of inspection procedures and inspection signal status during normal operation.
This knowledge is stored in auxiliary memory such as a floppy disk, divided by system to be diagnosed and by level of fault source identification (system block, board, board, etc.). The information is inputted by the user 18 via the dialogue processing section 17, which will be described later.

The diagnostic procedure knowledge base 12 includes information on target-specific diagnostic procedures (where to start investigating, where to investigate next, etc.) and knowledge control of the target system configuration divided by system and level (information on knowledge control for target system configurations divided by system and level). The necessary information is which one of the target system configuration knowledge base 13 to use, etc.)
It is registered separately by system and by level of failure source identification.

Further, in the target system configuration knowledge base 13, knowledge regarding configuration data including electronic circuit names, connection relationships, drawings, etc. is registered by system and by level of failure source identification.

The inference unit 14 obtains information regarding diagnostic procedures, connections between circuits, etc. from the diagnostic procedure knowledge base 12 and the target system configuration knowledge base 13 referenced therefrom, and dynamically generates necessary diagnostic procedures. At the request of inspector 18,
Target drawing data and inspection procedures are presented via the dialog processing section 17.

Diagnostic procedures are not fixed, but are dynamically generated by combining them according to the state of input signals from procedure information stored separately in auxiliary memory such as a proppy disk. It has become.

The inference unit 14 also transmits information necessary for diagnosis to the interaction processing unit 1.
7, the current information requested and input is temporarily stored in the working memory 15, and the source of the failure is determined by comparing the information stored in the working memory 15 with the knowledge. , the results are stored in the diagnostic result storage section 16. As a result, even if maintenance personnel take over and ultimately make judgments on a board-by-board basis after operators have determined the source of failure at the functional block level, they can perform diagnosis based on the saved results. By proceeding,
This prevents the waste of having to restart the diagnosis from the beginning.

In addition, when starting the diagnosis, the inference unit 14 uses the pattern of the status of the plant inspection signals that the inspector 18 normally checks in the central control room or on-site, and the selection of failure source candidates in the diagnosis result storage unit 16. The results are compared with experienced signal state patterns registered in pairs to determine whether they are the same. If they are the same, the fault source detector registered in the diagnostic result storage unit 16 is called up and displayed, and if the input patterns are different, the fault source is detected using the knowledge about the connection relationships of the circuits. selects a functional block for greeting and displays it via the interaction processing unit 17;
In addition, the manually generated signal state patterns and the selection results of failure source candidates are registered as a set in the diagnostic result storage section 16. In other words, it has a learning function that memorizes the failure situations experienced several times and utilizes it for later diagnosis.

The working memory unit 15 temporarily stores the results determined by the inference unit 14 as described above, and the diagnostic result storage unit 16 stores the learning results (signal patterns and faults). (a pair with a source candidate) and information regarding the identified failure source are stored for each level.

The dialogue processing unit 17 also handles communication between the inspector 18 and Riki Okawa.

In FIG. 2, the white dashed arrows indicate processes to be performed in advance at the time of diagnosis, and the black arrows indicate processes during diagnosis. Furthermore, the white arrow between the dialogue processing unit 17 and the inspector 18 indicates these two processes.

FIGS. 3(a) and 3(b) are flowcharts showing the processing procedure of the electronic circuit diagnostic apparatus, and the operation of this embodiment will be explained below with reference to this flowchart.

First, in step S1 shown in FIG. 3(a), it is determined whether manual labor with knowledge is to be performed or diagnosis of the enclosure is performed, and in the case of manual labor with knowledge, step S2 shown in FIG. 3(b) is performed. , determine whether it is knowledge conversion or knowledge input. In the case of knowledge conversion, the registered data is converted by system and level in step S3, and then the process returns to step S2. In addition, in the case of knowledge input, in step S4,
A system name is input, and in step S5, it is determined whether there is data related to the system that has been manually generated.

If it is determined in step S5 that there is data, the stored data is called in step S6, and if it is determined that there is no data, step S7
, register a new strain name. Then, in step S8, the level of circuit data to be input is input, and in step S9, it is determined whether there is circuit data of the same level.

If it is determined in step S9 that there is circuit data, the saved data is called in step SIO, and if it is determined that there is no circuit data, preparations are made for inputting new data in step S11. . Then, in step S12, data necessary for diagnosis is input, and in step S13, the input data is registered.

On the other hand, if it is determined in step S1 of FIG. 3(a) that the circuit is to be diagnosed, it is determined in step S14 whether to start a new diagnosis or continue the diagnosis. and,
If it is determined that a new diagnosis has started, step S15
In step S16, it is determined whether or not the input signal pattern has been experienced.

If it is determined that the failure source has been experienced in step S16, the stored results are called up and displayed in step S17, and on the other hand, if it is determined that the failure source has not been experienced, a candidate for the failure source is determined in step S18. At the same time, in step S19, the signal state pattern and the failure source candidate are registered as a pair.

If it is determined in step 514 that the diagnosis is to be continued, the saved diagnosis result is called up in step S20.

Next, in step S21, it is determined whether or not to perform a more detailed level of diagnosis. If it is not necessary, in step S22, the fixed failure source is registered and displayed, and the process returns to step S1.

If a detailed level of diagnosis is required, information necessary for determination is requested in step 823, and drawing data is displayed based on the input. Further, in step S24, the source of the failure is determined, and the process returns to step S21.

FIG. 4 is a block diagram of the water supply flow rate control system for the atomic coupler. Below, we will explain a specific example of the diagnostic method by taking as an example a case where a minor failure occurs in the electronic circuit that makes up this control system. .

As shown in FIG. 4, the water supply system of the nuclear coupler plant is composed of an outlet steam temperature control device 21 and a feed water flow rate control device 22, which control the temperature of the outlet steam and the feed water flow rate.
It is designed to adjust the opening degree of the water supply control valve.

If a minor failure occurs in the electronic circuits that make up such a control system, the first thing operators should do is check the status of the outlet steam temperature and feed water flow rate in the central control room. ! ! (Both signals are abnormal). Based on the input signal state, the outlet steam temperature control device 21 and the feed water flow rate control device 22 are selected as failure source candidates and displayed in operation d. Furthermore, since the human-generated signal patterns were not experienced before, these and failure source candidates were registered as a pair and used for future diagnosis.

In order to determine which device actually failed from the obtained failure source candidates, the operator is guided to hold or manually control one of the two control devices 21 and 22. For example, if an abnormal feed water flow rate due to an abnormal opening of the feed water control valve is detected when the outlet steam temperature is manually controlled, it is determined that the failure source at the block level is the feed water flow rate control device 22. , register the results.

Thereafter, in order to perform diagnosis at a more detailed level, the control function block diagram of the water supply flow rate control device 22 is displayed to maintenance/repair personnel on site based on the above results, and the control function block diagram of the water supply flow rate control device 22 is displayed to the maintenance/repair personnel on the basis of the above results. Guide you through the checks. This guide also includes wiring up circuits, disconnecting cables, and checking their output signals.

Finally, the source of the failure is determined up to a replaceable unit, such as that the board of the control calculation unit constituting the water supply flow rate control device 22 of the water supply flow rate control system is the source of the failure. Here, if the replaceable unit is a board, the process is performed up to the board level, and if the unit is a controller, the process is performed up to the control level.

〔Effect of the invention〕

As explained above, according to the present invention, when a minor failure occurs in the electronic circuit that constitutes the control system of a large-scale plant, it helps operators and inspectors of maintenance/repair equipment to identify the source of the failure. However, since the source of the failure can be determined for each board or even for each replaceable board, it is possible to reduce the time spent on recovery and improve economic efficiency.

Furthermore, since it has a learning function, when the same pattern is input again, the processing time for diagnosis can be further shortened.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an electronic circuit diagnostic device according to an embodiment of the present invention, FIG. 2 is a functional configuration diagram expressed in a different way,
FIGS. 3(a) and 3(b) are flowcharts showing the operation, and FIG. 4 is a block diagram showing the water supply flow rate control system of the atomic couplant. DESCRIPTION OF SYMBOLS 1... Target system configuration knowledge storage means, 2... Diagnosis procedure knowledge storage means, 3... Input means, 5... Fault source candidate selection means, 6... Fault source candidate storage means, 7. ...Failure source determination means.

Claims (1)

[Scope of Claims] Target system configuration knowledge storage means for storing configuration knowledge consisting of names, connection relationships, and drawing data of electronic circuits constituting the control system of the system, divided by system and failure source identification unit; and inspection. Diagnostic procedure knowledge storage means that stores knowledge regarding target-specific diagnostic procedures consisting of procedures and inspection signal status data during normal operation, divided by system and failure source identification unit, and an input for inputting information on the current status of the system, etc. and a diagnostic procedure generating means for generating drawing data to be diagnosed and a diagnostic procedure for each fault source identification unit based on the memory contents of both the storage means and according to the input information from the input means, fault source candidate selection means for selecting a fault source candidate in a fault source identification unit from the state of an inspection signal of a system in which the fault source candidate storage means for storing the state pattern of the inspection signal in association with the state pattern; and determining whether or not the state pattern of the inspection signal inputted from the input means is stored in the fault source candidate storage means; If it is stored, the corresponding fault source candidate is selected, and if it is not memorized, the fault source candidate is selected in the fault source identification unit based on the knowledge about the connection relationship of the circuit, and the selected fault source candidate is selected. An electronic circuit diagnostic apparatus comprising: a fault source determining means for storing a fault source candidate in the fault source candidate storage means.