JPH03210604A - Back-up method for trouble analysis - Google Patents

Abstract

PURPOSE:To quickly analyze the factor of a trouble by providing a monitoring device which inputs the control data from each controller and detects the abnormality and then calling out the control data on other working machines in relation to a specific machine when the monitoring device detects a trouble of the specific machine. CONSTITUTION:A common monitoring device 10 is provided to monitor the states of a 1st controller 13, a 2nd controller 23, a 3rd controller 33, and a 4th controller 43 respectively. When the device 10 detects the abnormality of a specific controller, another controller having the operating relation to the specific controller is selected. Then the trigger signals are applied to both the selected controller and the specific one. Based on these trigger signals, the controllers 13 - 43 output their control data before and after the transmission of the trigger signals. In such a case, it is possible to immediately obtain the control data set before and after the stoppage of troubles of a fault displaying machine and its related machine since another machine related to the fault displaying machine is previously selected. Thus the factor of the trouble is quickly analyzed and therefore the discontinued time of a machine system can be minimized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is designed to quickly collect necessary control data when a mechanical system in which a plurality of machines are operated in conjunction with each other breaks down, thereby preventing the failure from occurring. Find out how to support analysis.

[Conventional technology]

FIG. 2 is a configuration diagram showing a conventional example of collecting control data when a mechanical system consisting of a plurality of machines fails.

This figure 2 shows the 10th rule 11, the 20th rule 21, and the 3rd rule.
Steel plate 2 at 0-ru 31 (illustration omitted from 40-ru)
The rolls are sequentially rolled in the direction of the arrow, and each of these rolls is a rolling device as a mechanical system that operates in relation to each other via the steel plate 2. Here the 10th
11, the first motor 12 that drives it, the first control device 13, the 20th rule 21, and the second motor 2 that drives it.
This rolling apparatus is composed of a second control device 23, a third motor 32 for driving the third motor 32, a third control device 33, and the like.

For large-scale mechanical systems such as rolling mills, failures and stoppages can cause great damage, so failures must be avoided as much as possible, but if a failure occurs,
It is necessary to quickly discover the cause of the failure and minimize the downtime of the rolling mill.

To this end, this rolling mill is equipped with the following failure analysis equipment. That is, each control device I1.2+
, 31.41 constantly samples the control data of the rolls belonging to each and the motors that drive these rolls. However, it is uneconomical to constantly record the control data obtained in this way because failures occur only rarely, so it is necessary to make it possible to read out the control data for each ζ as needed. is common.

That is, as shown in FIG. 2, each control device is provided with a separate failure detection relay 14, 24, 34, 44, and if an abnormality occurs in, for example, the 20-rule 21 or the second motor 22, the second The failure detection relay 24 is activated by a signal from the control device 23, and the recorder 3 is activated via the trigger relay 4, so that the control data before and after the occurrence of the failure stored in the second control device 23 is recorded in this recorder 3. By doing so, it is possible to know in which part of the 20th rule 21, the second motor 22, or even the second control device 23 an abnormality has occurred. Therefore, by checking this record in detail, the cause of the failure can be quickly analyzed.

[The invention will solve the problem!] However, in a mechanical system such as a rolling mill where multiple machines operate in an interconnected manner, even if a particular machine is operating normally, an abnormality in another machine may cause this problem. It may occur as a malfunction of a specific machine.

For example, even if the second motor 22 becomes overspeed, this overspeed may be caused by the steel plate 2 being pulled too much by the 30th rule 31, or may be caused by the steel plate 2 being pushed too much by the 10th rule 11. In some cases, the cause of the failure cannot be determined from the control data of the second control device 23, so the first
The cause of the failure can only be determined by examining the control data of the III control device 13 or the third control device 33, and it takes a long time to determine the cause of the stoppage of the rolling mill and restart operation. .

Therefore, the purpose of this invention is to make it possible to extract necessary control data so that when a failure occurs in a mechanical system in which multiple machines are operated while maintaining relationships with each other, the cause can be quickly determined. be.

[Means to solve the problem]

In order to achieve the above object, the failure analysis support method of the present invention provides a method for supporting failure analysis in which each of the control devices in a mechanical system in which a plurality of machines, each of which is individually attached to a control device, is operated in relation to each other. In the method of supporting failure analysis by sampling the control data and calling this control data in the event of a failure of the mechanical system, a common monitoring device is provided for monitoring the status of each of the control devices; When the device detects that an abnormality has occurred in a specific control device, it selects other control devices that are operationally related to this specific control device, and gives a trigger signal to these related control devices and the specific control device; In accordance with this trigger signal, each control device outputs control data before and after the trigger signal is issued.

[Effect]

In a mechanical system where multiple machines operate in a mutually related manner, even if a particular machine malfunctions, the cause of the malfunction is not in this particular machine, and the malfunction in another machine causes the malfunction in this particular machine. It often appears as a. Therefore, in the present invention, a monitoring device is provided that inputs control data from each control device and detects an abnormality, and if this monitoring device detects a failure of a specific machine, the machine is operated in conjunction with this specific machine. By also calling control data of other machines,
It attempts to quickly find the cause of failure in the mechanical system.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.

Like the conventional example described above, this FIG.
A 20th motor driven by the motor 22 and the second control device 23
There is a 30th RA 2I, a 30th RA 31 driven by a third motor 32, and a third control device 33. The steel plate 2 is moved in the direction of the arrow while being sequentially rolled by each of these rollers. It should be noted that, as in the conventional example shown in FIG. 2, each control device constantly samples control data for the rollers and motors that belong to it.

In the present invention, a common monitoring device 10 is provided for each of these control devices, and control data from each control device is input to this monitoring device 10 via a transmission line 9, so that this monitoring device 1O can check the presence or absence of an abnormality. I'm always checking. here,
For example, when it is detected that the speed of the second motor 22 has exceeded a predetermined speed, the monitoring device 1O issues a trigger signal and transmits the control data of the second motor 22 in which the abnormality is occurring from the second control device 23. At the same time as issuing a command to import, the control data of the first motor 12 at the front stage and the control data of the third motor 32 at the rear stage, which are determined in advance to be related to the second motor 22 in terms of operation, are transmitted by the trigger command. The data is taken into the monitoring device IO.

Note that the control data taken in by the monitoring device 10 is, of course, data for a period from a predetermined time period before the abnormality occurrence point to a certain time period after the abnormality occurrence time point.

The control data of the first control device 13, second control device 23, and third control device 33 during the above-mentioned period, which was taken into the monitoring device IO based on the trigger command, is recorded on a recorder (not shown), etc. The investigation revealed whether the overspeed of the second motor 22 was caused by an abnormality in the second motor 22, whether it was caused by the third motor 32 pulling the steel plate 2, or whether the overspeed of the second motor 22 was caused by the third motor 32 pulling the steel plate 2, or whether the overspeed of the second motor 22 It can be determined in a short time whether the problem was caused by the steel plate 2 being pushed into the steel plate 12.

Note that the monitoring device IO may select and register in advance which one to trigger when an abnormality occurs in any of the rollers, motors, or control devices that make up the rolling device.

〔Effect of the invention〕

In the case of a mechanical system in which multiple machines operate in conjunction with each other, even if an abnormality occurs in one of the machines, this abnormality may cause other machines to malfunction and stop. In such cases, even if a machine that has stopped due to a failure is investigated, the cause of the failure cannot be determined, resulting in the inconvenience that it takes a long time to restart operation.However, according to the present invention, other machines related to the machine that has displayed a failure indication can be checked. Since the selection is made in advance, the control data of the failure display machine and related machinery before and after failure and stoppage can be immediately obtained, allowing the cause of the failure to be quickly investigated, minimizing the downtime of the relevant mechanical system. A suppressive effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example of collecting control data when a mechanical system consisting of a plurality of machines fails. 2... Steel plate, 3... Recorder, 4... Trigger relay 9... Transmission line, IO... Monitoring device, 11...
・10th rule, 12...first motor, 13...first
Control device, 14.24.34゜44,... Failure detection relay, 21... 20th rule, 22... Second motor, 23... Second control device, 31... 30th 32...Third motor, 33...Third control device, 43...4th system 11th 10th rule

Claims (1)

[Claims] 1) In a mechanical system in which a plurality of machines, each of which is individually attached to a control device, are operated in conjunction with each other, each of the control devices individually samples its control data, and when the mechanical system fails, this control In the method for supporting failure analysis by calling data, a common monitoring device is provided for monitoring the status of each of the control devices,
When this monitoring device detects that an abnormality has occurred in a specific control device, it selects other control devices that are operationally related to this specific control device and sends trigger signals to these related control devices and the specific control device. and each control device outputs control data before and after issuing the trigger signal according to the trigger signal.