JPS61133412A - Fault diagnostic device - Google Patents

Abstract

PURPOSE:To improve the operating rate by providing a storage means storing a faulty location of a device to be controlled and storing input/output information representing the operation state of the device to be controlled and a storage means storing in advance a reference value used for discrimination of a fault diagnosis. CONSTITUTION:The fault diagnostic device 10 consists of a work input means 11, a display means 12, a storage means 13, a signal pocessing means 14, a reference storage means 15, a diagnostic procedure storage means 16 and a control means 17. The storage means 13 stores sequentially in time series a fault part of the device 20 to be controlled discriminated by the control means 17 and input/output information representing the operating state of the device 20 before and after the fault takes place. The signal processing means 14 is a signal interface between the device 20 and the fault diagnostic device 10. The reference value storage means 15 stores a reference value such as normal state or fault of the device 20 used for the discrimination of fault diagnosis. The diagnosis procedure means 16 compares the value inputted by the signal processing means 14 with the reference value stored the reference value storage means 15 for diagnosis.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to failure diagnosis of a controlled device, and particularly relates to a failure diagnosis device suitable for prior detection of failure and early investigation of the cause of failure.

[Background of the invention]

Conventional devices, for example, as described in Japanese Unexamined Patent Publication No. 59-16011, perform self-diagnosis of sensors at the time of repair and inspection of an automobile, which is a controlled device. In contrast, sensor abnormalities are diagnosed by manually entering diagnostic items. But this diagnosis! J
With W, it is not possible to diagnose abnormalities in sensors that occur during actual operation of a controlled device, and it is not possible to diagnose abnormalities in sensors that occur during actual operation. Because there was no way to memorize it, it was not possible to diagnose abnormalities in the sensor that occurred when the controlled device was in actual operation.In addition, it was not possible to diagnose abnormalities in the sensor that occurred when the controlled device was in actual operation. There was no consideration given to the

On the other hand, recent controlled bags M are often installed in automated production lines.

Therefore, if part of the production line stops, the overall operating rate will decrease, and in some cases, the entire line will stop.
In some cases, you may be forced into a state of Therefore, even if a failure occurs in a controlled device, there is a particular need to be able to quickly identify the cause of the failure, take countermeasures, and restore the system. In addition, there is also a need to be able to detect an abnormality in a controlled device before it breaks down, and to be able to repair the malfunctioning part in advance.

[Purpose of the invention]

The purpose of the present invention is to make it possible to quickly and easily investigate the cause of a failure that occurs in a controlled device in actual operation, and also to make it possible to detect abnormalities.
An object of the present invention is to provide a failure diagnosis device that can minimize downtime of a controlled device and improve the operating rate.

[Summary of the Invention] The present invention provides a work input means for inputting a work instruction command and a detailed data display command, and a work input means for inputting a work instruction command and a detailed data display command, and a means for displaying a failure location of a controlled bag holder and controlling the operation of a controlled device before and after a failure occurs. A display means for sequentially displaying input/output information indicating the status, a storage means for storing the failure location and input/output information indicating the operating status of the controlled device before and after the occurrence of the failure, and at least analog input from the controlled device. A signal processing means for processing output signals and digital input/output signals, a diagnostic procedure storage means for storing in advance a fault diagnosis procedure, and a reference value storage means for storing in advance a reference value used in determining a fault diagnosis. , and a control means for collectively controlling these.
This makes it possible to quickly and easily investigate the cause of a failure that occurs in a controlled device that is in actual operation, and to detect abnormalities in advance.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, the fault diagnosis device 10 is composed of a work input means (2), an indicator terrace, a storage means 13, a signal processing means 14, a reference value storage means 15, a diagnostic procedure storage means 16, and a control means 17. .

The work input means (■) provides a work instruction command that instructs the diagnosis items and diagnosis contents of the device to be diagnosed as the work contents of failure diagnosis, and instructs to display on the indicator terrace the information necessary for failure analysis when a failure occurs. It is used to input detailed data display commands, and is, for example, a keyboard.

The indicator terrace displays the failure location determined by the control means 17 as the cause of the failure when a failure occurs in the controlled device i20, and also provides input/output information indicating the operating state of the controlled device m after the failure occurs. - is displayed sequentially in chronological order before and after the occurrence of a failure, such as on a CRT (cathode ray tube display device fil).

The storage means 13 stores the controlled bag 5 determined by the control means 17!
It stores input/output information indicating the location of a fault and the operating status of the controlled device before and after the fault occurs in chronological order, for example, in memory with a printer. It is. Note that the input/output information is stored in such a way that when a predetermined amount of information is reached, old information is deleted and new information is stored.

The signal processing means 14 outputs an analog output signal and a digital output signal that the controlled device 2D outputs to control the controlled device $2D while the controlled device 2D is in operation, and an analog input signal that indicates the operating state of the controlled device 2D. Trouble diagnosis bag rj with digital input signal and information! t10, and is a signal interface between the controlled device I and the failure diagnosis device jlO. For example, an analog input board and a digital input board.

The reference value storage means 15 stores reference values such as normality, failure, etc. of the control bag @beautiful used for determining failure diagnosis.
ory) to store a predetermined reference value.

The diagnostic procedure means 16 stores the logic of the diagnostic procedure for fault diagnosis, and the control means 17 stores the values and standards input by the signal processing means 14 according to the procedure of the diagnostic procedure storage means 16. Diagnosis is performed by comparing the reference value stored in the value storage means 15.

The control means 17 collectively controls the means described above, and includes, for example, CPU (Central, Proc.
essorUnit).

Next, FIG. 2 shows typical operations using the apparatus shown in FIG. 1 and the operation of the apparatus.

First, the power is turned on to the failure diagnosis apparatus i10, and the items and contents of the failure diagnosis are entered manually from the work input means 11. Next, the input for fault diagnosis is completed and diagnosis of the fault diagnosis bag riL10 is started, and the controlled device t2
0 to notify P that the diagnostic function has started.
, input the diagnosis OK. Next, P is the controlled device!
[Controlled device I regardless of whether 2G is operating or not.]
The data of analog input/output signals and digital input/output signals of the controlled device 5t20 are taken in from the signal processing means 14 as input/output signals indicating the operating state of the device, and the storage means 13I stores and stores the respective signals in chronological order. I'll keep it. Next, regarding the logic of the data of the analog input/output signal and digital input/output signal input at P4, the diagnostic procedure storage means 16
According to the procedure stored in the reference value storage means 15i
This is checked against the stored reference values, and if a fault is found, a fault is output. The details will be described later.

Next, at P, find the deviation between the AI input value, which is the AN9-/Evuku signal for the input/O output value, and the AO output value, and P
, it is determined whether the deviation exceeds the reference value stored in the reference value storage means 15. If the deviation is within the reference value, it is determined that the controlled device rI12o is normal, and the input/output signal to the controlled device is inputted again.
Return to 3. Note that when inputting the input signal of the controlled device i20 again, a fixed time interval is provided in P7. By adjusting this time interval, the data sampling period can be adjusted.

If the deviation exceeds the reference value at P, it is determined whether the deviation is within the range of prior failure detection.

If it is within the range of prior failure detection, it is determined that the abnormal state is between a normal state and a failure. In this case, if this state continues, a failure may occur in the near future, and at P, the abnormality location of the controlled device t20 is stored in the storage means 13, and the abnormality of the controlled device 20 is displayed on the display means. The location and abnormality occurrence information are displayed, and the controlled device W120 is displayed again.
Returning to flow P, which inputs the input/output signals of . P, if the deviation is outside the range of failure detection, the controlled device f3
) is determined to have failed, the failure location of the controlled device 5120 is stored in the storage means 13 using pH, and the failure location of the controlled device 5120 and information on the occurrence of the failure are displayed on the display means. In this case, it is also possible to attach an alarm (not shown) to the failure diagnosis device 10 to warn of the actual occurrence of a failure in the controlled device. Normally, in the failure diagnosis procedure, when the maintenance man needs detailed data in order to understand the detailed contents of the failure of the controlled equipment R20 when the pH is stopped, the detailed information is inputted from the work input means 11. Enter data display commands. When the control means 17 detects the detailed data display command, it reads DI, Do, and the like stored in the storage means 13.
The data of AI and AO is displayed in chronological order on the display means 13, and the operator looks at the displayed data on Pfa, analyzes the details of the failure and the route leading to the failure, and takes measures to take the cause of the failure. , to repair and return to normal condition.

As another configuration example, it is also possible to connect a printer and have the printer print out the content displayed on the display means.

As another configuration example, when the controlled device is stopped due to a failure etc., the AO1DO signal output by the controlled device is outputted from the signal processing means in a simulated manner to reproduce the state at the time of the failure. It is also possible to understand the detailed cause of the failure.

〔Effect of the invention〕

As explained above, the present invention allows for a quick and accurate investigation of the cause of a failure that occurs in a controlled device during actual operation, as well as prior detection of an abnormality.
This has the effect that downtime of the controlled device can be minimized and the operating rate can be improved.

1 is a block diagram showing an embodiment of the failure diagnosis apparatus according to the present invention, and FIG. 2 is an example of a flowchart of the diagnosis shown in FIG. 1.

11... Work input means, I2... Display means, 13... Song storage means, 14... Signal processing means, 15... Reference value storage means. 16...
・Diagnostic procedure storage means, 17...control means, beauty・
...Controlled device

Claims (1)

[Claims] 1. A work input means for inputting work instruction commands and detailed data display commands, and a display for displaying the failure location of the controlled device and sequentially displaying input/output information indicating the operating status of the controlled device before and after the failure occurred. storage means for storing a failure location of the controlled device and input/output information indicating the operating state of the controlled device before and after the failure occurs; and at least an analog input/output signal and a digital signal from the controlled device. a signal processing means for processing input/output signals; a diagnostic procedure storage means for storing a fault diagnosis procedure in advance; a reference value storage means for storing a reference value used in determining the fault diagnosis in advance;
A fault diagnosis device characterized by comprising a control means for collectively controlling these.