JPH09179607A - Fault diagnostic display device for machine for work machining and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten fault factor investigation time and to improve the operating ratio of machine by displaying a fault message corresponding to an abnormality detection relay and displaying the detailed contents of fault corresponding to the equipment number of abnormality detection relay on the same screen when the fault is caused. SOLUTION: Data expressing the operating state (ON/OFF state) of fault diagnostic circuit in a PLC 10 are cyclically transmitted from the PLC 10 to a fault monitoring device 30 in a prescribed cycle by data communication. The CPU of fault monitoring device 30 cyclically writes these received data expressing the operating state into prescribed storage areas corresponding to respective sensors, actuator and fault detection relay, checks the operating states of storage areas in a prescribed cycle and judges whether the abnormality detection relay is operated or not. When the abnormality detection relay is operated, the occurrence of fault is judged and information for investigating the factor of fault corresponding to this abnormality detection relay is displayed on a display 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault diagnosis display device and a display method for a work machine, particularly a press machine.

[0002]

2. Description of the Related Art In a work machine such as a press machine, a large number of actuators and sensors are used to control the operation of the machine. Sequence control is performed. As an example of a work processing machine, a press machine is shown in FIG.
It is represented by an external view such as. Each part of the press machine 1 has various actuators 3a to 3c and sensors 4a to 4c.
4d and the like are provided. It should be noted that the actuators, sensors, and the like are schematically shown in the figure, and the numbers shown are a part of the actual number of attachments. An operation switch for operating these actuators and a lamp display showing the operation state of the actuator and the sensor are provided in the operation panel 2 provided at a predetermined position of the press machine 1, so that the operator can It is easy to operate while monitoring peripheral devices. In addition, a monitor display 5 is provided in the operation panel 2 so that various operational messages and operating states of the machine can be displayed.

In order to ensure the safety of the operation of the press machine 1, the main part of the sequence control circuit generally constitutes a contact circuit, and the whole sequence control is performed based on this contact circuit. In many cases, a programmable logic controller (hereinafter referred to as PLC) such as a sequencer is used as a control device. FIG. 8 shows the configuration of a control device using this PLC. PLC
Reference numeral 10 designates a power supply unit for supplying power, a CPU unit for performing various kinds of arithmetic processing and sequence control processing, a digital input / output unit for an input / output interface section for external on / off signals, and RS232C and RS422
It is a general PLC having various units according to specifications such as a communication unit of a serial communication interface unit. Moreover, when the press machine 1 becomes a medium-sized or large-sized model, or the number of peripheral devices such as a carry-in device and a carry-out device increases,
Since the number of input / output points increases and the number of mounting units for the PLC 10 increases, the remote I / O units 10a and 10b for expansion are often used. The digital input / output unit is connected with contact devices such as relays and switches, lamp displays, sensors and actuators for sequence control, and the monitor unit 5 is connected with the communication unit.

Further, the PLC 10 combines various output signals of a switch, a relay and various abnormality detection sensors (for example, a temperature sensor, a pressure sensor, a limit switch) and the like for the purpose of diagnosing a failure of a control system and detects various kinds of failures. It constitutes a sequence ladder circuit. When a failure occurs, a predetermined abnormality detection relay in the sequence ladder circuit is activated, and the operating state data is written in a predetermined storage area in the PLC 10. Since there are usually many failure detection items, in order to shorten the time for investigating the cause of the failure when an actual failure occurs, the failure message and the failure detection relay number corresponding to the failure detection relay are displayed on the monitor display 5 when the failure occurs. Is displayed to assist the worker in investigating the cause.

[0005]

However, in many cases, the cause cannot be determined only by displaying the failure message and the abnormality detection relay number as described above. At this time, the operator needs to investigate in detail the specific circuit related to the abnormality detection relay in the sequence ladder circuit, based on the displayed contents, to investigate the cause. For this reason, the operator P
A sequence circuit monitor device (hereinafter referred to as a programmer) 20 usually called a programmer is connected to the LC 10 and operated to search for a peripheral circuit of an abnormality detection relay corresponding to the above-mentioned failure. Then, the retrieved ladder circuit is displayed on the programmer 20, and the ladder circuit is checked while looking at it. As described above, it takes a lot of time to find the cause due to the connection time of the programmer 20 and the search time of the abnormality detection relay peripheral circuit, which causes a problem that the operation rate of the work machine decreases.

Further, in actually investigating the peripheral circuit of the abnormality detection relay, it is necessary to confirm where the corresponding relay, sensor, actuator and the like are arranged by a drawing or a manual. Further, it is often difficult to identify the true cause of failure only with the ladder circuit displayed on the programmer 20, which is one of the reasons why it takes time to investigate the cause. For example, the cause of the failure corresponding to the abnormality detection relay number is the failure of the failure detection relay itself, the operating conditions of other relays or sensors for the failure detection relay to detect the failure, or the disconnection of wiring or the drop of the power supply voltage. It is related to various factors such as abnormal conditions. Therefore,
There is a strong demand for a failure diagnosis support device that can reliably investigate the cause in a short time.

The present invention has been made in view of the above problems, and a fault diagnosis display device and a display for a work machining machine capable of shortening the time for investigating the cause of a fault and improving the machine operating rate. It is intended to provide a way.

[0008]

In order to solve the above-mentioned objects, the invention according to claim 1 is a sequence ladder circuit in which a sequencer 10 and a sensor, an actuator and a contact device are combined and wired. In the fault diagnosis display device of the workpiece machining machine 1 which is provided in the workpiece machining machine 1 controlled by and displays the fault detected in the sequence ladder circuit, the fault is detected by the abnormality detection relay in the sequence ladder circuit. Detect and
It is determined whether or not a failure has occurred based on the PLC 10 that transmits the data indicating the operation state of the abnormality detection relay that has detected a failure to the outside, and the data that is received from the PLC 10 and that indicates the operation state of the abnormality detection relay. When I did
While displaying a failure message corresponding to the abnormality detection relay, as a detailed content of the failure corresponding to the equipment number of the abnormality detection relay, a sequence ladder circuit related to the abnormality detection relay, the cause of failure, a procedure for investigating the cause of failure,
Failure monitoring device capable of selectively displaying at least one of the details of the stop range, failure detection method, and detailed layout of related sensors and actuators, and performing these displays on the same screen And 30.

According to the first aspect of the present invention, when a failure occurs, the abnormality detection relay of the sequence ladder circuit in the sequencer operates, and the data representing the operating state of the abnormality detection relay is sent from the sequencer to the failure monitoring device. Sent. The failure monitoring device judges whether a failure has occurred based on the received data, and when the failure has occurred, a failure message corresponding to the activated abnormality detection relay is displayed. At the same time, the detailed contents of the failure corresponding to the abnormality detection relay include a sequence ladder circuit related to the abnormality detection relay, a failure cause, a procedure for investigating the cause of the failure, a stop range, a failure detection method, and related sensors and actuators. When the operator selects at least one item in the detailed layout, this display is made on the same screen as the failure message display. Therefore, even if it is difficult to find out the cause only with the failure message, the cause can be found by looking at the sequence ladder circuit and other detailed information. As a result, the time for investigating the cause can be shortened and the operation rate of the machine can be improved.

According to a second aspect of the present invention, in the fault diagnosis display device of the work machining machine 1, the fault monitor device 30 displays at least the fault message and the sequence ladder circuit simultaneously on the same screen. It is possible.

According to the invention of claim 2, the failure message display and the sequence ladder circuit display can be simultaneously performed on the same screen. Therefore, the operator can investigate the cause while checking the displayed contents in correspondence with each other. As a result, the investigation of the cause becomes even easier and the investigation time can be shortened.

According to a third aspect of the present invention, there is provided a method of displaying a fault diagnosis display device for a work machining machine 1, wherein 1) an abnormality detection relay corresponding to the cause of the failure is activated by an abnormality detection sequence ladder circuit, ) While displaying the failure message corresponding to the activated abnormality detection relay, 3) Sequence ladder circuit corresponding to the activated abnormality detection relay, failure cause, failure cause investigation procedure, stop range, failure detection method, and related At least one item in the detailed layout of the sensors and actuators can be selectively displayed.

According to the third aspect of the present invention, when a failure occurs, the abnormality detection relay corresponding to the cause of the failure is activated by the failure detection sequence ladder circuit in the sequencer, and the activated abnormality detection relay is addressed. A failure message is displayed. At the same time, at least one item in the sequence ladder circuit corresponding to the above-mentioned abnormality detection relay, failure cause, procedure for investigating failure cause, stop range, failure detection method, and detailed layout of related sensors and actuators If is selected, this display is made on the same screen as the display of the failure message. Therefore, even if it is difficult to find out the cause only with the failure message, the cause can be found by looking at the sequence ladder circuit and other detailed information. As a result, the time for investigating the cause can be shortened and the operation rate of the machine can be improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows the configuration of a failure diagnosis display device for a work machining machine according to the present invention. The PLCs 10, 10a, 10b are sequence control devices for a work machining machine, which are configured by the same PLCs as those described in the related art of FIG. The PLC 10 is connected to a failure monitor device 30 that is performing data communication by RS232C, for example. The failure monitoring device 30 is a computer such as a microcomputer (hereinafter,
It is a computer system mainly composed of a CPU), and may be composed of a general personal computer,
It is provided with a display device 31 capable of graphic display such as a CRT or a liquid crystal display device, a keyboard 32, and a mouse 33 for operating a cursor. The above data communication is not limited to RS232C, and can be realized by other data communication methods such as RS422 and Ethernet.

Through the above-mentioned data communication, data representing the operating states (ON, OFF states) of the sensors, actuators, and fault detection relays related to the fault diagnosis circuit in the PLC 10 are transmitted from the PLC 10 to the fault monitoring device 30 at a predetermined cycle. It is sent cyclically. Failure monitor device 30
The CPU cyclically writes the received data representing the operating state in a predetermined storage area corresponding to each of the sensors, actuators, and failure detection relays. And
The CPU of the failure monitoring device 30 checks the operation status data in the storage area at a predetermined cycle to determine whether the abnormality detection relay has operated. When the abnormality detection relay is activated, it is determined that a failure has occurred, and the display 31 displays information for investigating the cause of the failure corresponding to this abnormality detection relay. In addition, only when the abnormality detection relay is activated, the abnormality detection relay number is assigned from the PLC 10 to the failure monitoring device 3
0 by the above-mentioned data communication, and the failure monitoring device 3
0 may judge that a failure has occurred when this abnormality detection relay number is received.

FIG. 2 shows a failure monitor device 30 when a failure occurs.
The example of the content displayed on the display 31 of FIG. A device layout diagram of the entire operating system is displayed on the upper screen 31a, and a device name corresponding to the number assigned to each device displayed on the device layout diagram is displayed in the screen central portion 31b below the device layout diagram. It is displayed. Further, a failure message when a failure occurs and an abnormality detection relay number (hereinafter referred to as a device number) related to the failure message are displayed on the lower left side 31c of the screen. A selection switch for displaying detailed information on the display 31 for failure diagnosis is displayed on the lower right side 31d of the screen.

In the present invention, the following contents are displayed as detailed information for performing the failure diagnosis so that the operator can easily find out the cause of the failure. That is, the peripheral ladder circuit diagram of the relay of the displayed device number, the cause of the failure message, the remedy method (procedure for investigating the failure cause), the stop range (stop range and phenomenon of each device due to the failure occurrence),
It is possible to selectively display a specific failure detection method and a detailed layout of each sensor, actuator, or the like that may cause a failure.

FIG. 3 shows an example in which the ladder circuit diagram around the relay of the device number related to the failure is displayed in the window on the display screen of FIG. In addition, FIG.
The example which displayed the treatment method, the stop range, and the failure detection method in the window is shown. The screens of FIGS. 3 and 4 are displayed by clicking the mouse 33 on the "ladder" and "manual" display portions on the lower right side 31d of the screen of FIG. 2 (the operation of moving the cursor to the display and turning on the switch of the mouse). By saying), it will be displayed.
Alternatively, a corresponding screen may be displayed by a key input from the keyboard 32.

Further, in the screens of FIGS. 3 and 4, by clicking the display portions of "Procedure" and "Device" with the mouse 33, a screen showing a procedure for investigating the cause of failure as shown in FIG. 5, respectively. , And a screen showing a detailed layout of each sensor, actuator, etc. that may cause a failure as shown in FIG. In addition,
The above-mentioned "procedure" and "apparatus" selection switches may be displayed in FIG.

The display processing flow in such a fault diagnosis display device for a work machining machine will be described below. (Step 1) The sequence detection circuit for abnormality detection in the PLC 10 activates the abnormality detection relay corresponding to the cause of the failure. (Step 2) From the PLC 10 to the failure monitoring device 30,
Data indicating that the abnormality detection relay has been activated (operating state data or device number data of the activated abnormality detection relay) is transmitted.

(Step 3) The failure monitor 30 detects the operation of the abnormality detection relay based on the received data,
Displays a failure message corresponding to the activated abnormality detection relay. (Step 4) When "Ladder" is selected by the operation input of the mouse 33 or the keyboard 32, Step 5
Go to step 6 when "Manual" is selected.
If the "procedure" is selected, the process proceeds to step 7, and if the "device" is selected, the process proceeds to step 8.

(Step 5) The failure monitoring device 30 selects the step number of the sequence ladder circuit in which the equipment number of the activated abnormality detection relay is described from the sequence ladder circuit description data stored in the predetermined storage area ( The serial number given to each line in the ladder circuit according to the order of description is searched to display the ladder circuit related to the activated abnormality detection relay. (Step 6) The failure monitoring device 30 selects, from the manual description data stored in the predetermined storage area, the failure message, cause, remedy, stop range and detection method corresponding to the device number of the activated abnormality detection relay. Display on screen.

(Step 7) From the cause investigation flow description data stored in the predetermined storage area, the failure monitoring device 30 displays a failure cause investigation flowchart corresponding to the device number of the activated abnormality detection relay on the screen. indicate. (Step 8) The failure monitoring device 30 displays on the screen the detailed arrangement of the sensors, actuators, etc. related to the activated abnormality detection relay from the equipment layout diagram description data stored in the predetermined storage area.

As described above, the detailed information can be selectively displayed on the screen in response to the request of the operator, and the operator can easily investigate the cause of the failure based on the displayed contents. In this embodiment,
When "manual" is selected, the cause, the remedy method, the stop range, and the failure detection method are simultaneously displayed as the detailed information of the failure, but each information may be displayed individually. Also,
The display may be performed by dividing the screen instead of displaying the window.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a failure diagnosis display device according to the present invention.

FIG. 2 shows a screen display example when a failure occurs in the failure diagnosis display device according to the present invention.

FIG. 3 shows a screen display example of a ladder circuit of the failure diagnosis display device according to the present invention.

FIG. 4 shows a screen display example of a manual of the failure diagnosis display device according to the present invention.

FIG. 5 shows a screen display example of a cause investigation procedure of the failure diagnosis display device according to the present invention.

FIG. 6 shows a screen display example of a device layout diagram of a failure diagnosis display device according to the present invention.

FIG. 7 is an external view showing an example of a press machine according to a conventional technique.

FIG. 8 is a diagram illustrating a configuration example for press machine-fault diagnosis according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Press machine, 2 ... Operation panel, 3a-3c ... Actuator, 4a-4d ... Sensor, 5 ... Monitor display device, 1
0 ... PLC, 10a, 10b ... Remote I / O unit, 20 ... Programmer, 30 ... Failure monitoring device, 31 ...
Display, 31a ... upper part of screen, 31b ... central part of screen, 31
c ... the lower left part of the screen, 31d ... the lower right part of the screen, 32 ... keyboard, 33 ... mouse.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location G05B 23/02 301 0360-3H G05B 23/02 301K 0360-3H 301Y 302 0360-3H 302K

Claims (3)

[Claims] 1. A work machining machine (1) controlled by a sequence ladder circuit in which a sequencer (10) and a sensor, an actuator, and a contact device are combined and wired.
In the fault diagnosis display device of the workpiece machining machine (1) that displays the fault detected in the sequence ladder circuit, the fault is detected by the abnormality detection relay in the sequence ladder circuit, and the fault is detected. PLC (10) that sends data indicating the operating status of the abnormality detection relay to the outside
Based on the data indicating the operating state of this abnormality detection relay received from (10), it is determined whether or not a failure has occurred, and when a failure has occurred, a failure message corresponding to the above abnormality detection relay is displayed and The details of the failure corresponding to the equipment number of the abnormality detection relay include the sequence ladder circuit related to the above abnormality detection relay, the cause of the failure, the procedure for investigating the cause of the failure, the stop range, the failure detection method, and the details of the related sensors and actuators. Of the contents of the layout diagram,
At least one content can be selectively displayed, and
Failure monitor device (30) that displays these on the same screen
A fault diagnosis display device for a machine for working a workpiece, comprising: 2. The fault diagnosis display device for a work machining machine according to claim 1, wherein the fault monitoring device (30) displays at least the fault message and the sequence ladder circuit on the same screen at the same time. . 3. A method for displaying a fault diagnosis display device of a work processing machine (1), comprising: 1) activating an abnormality detection relay corresponding to the cause of the fault by means of a sequence ladder circuit for abnormality detection; and 2) detecting the activated abnormality. While displaying the failure message corresponding to the relay, 3) Sequence ladder circuit corresponding to the activated abnormality detection relay, failure cause, failure cause investigation procedure, stop range, failure detection method, and details of related sensors and actuators A method for displaying a failure diagnosis device for a machine for working a workpiece, wherein at least one item in the layout is selectively displayed.