JP2009163607A - Numerical control device having alarm cause display function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a numerical control device having an alarm cause display function, which attains memory saving by reducing information related to alarm. <P>SOLUTION: The numerical control device 10 which outputs a drive instruction 7 to an amplifier 3 for driving a motor 4 or the numerical control device 10 having the function of diagnosing operation states of peripheral devices 2, 3 and 4 includes a storage device 5 which stores an alarm message showing an abnormality of the operating states and information specifying the cause of the abnormality as additive information composed of Arabic numeral, alphabet or a combination of Arabic numeral and alphabet; and the alarm cause display function which selects, in the event of an abnormality in the numerical control device 10 or the peripheral devices 2, 3 and 4, the alarm message and additive information corresponding to the abnormality from a memory 5 to form a message, and requests a display device 2 to display the formed message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a numerical control device that controls machines such as machine tools and industrial machines, and more particularly to a numerical control device having an alarm cause display function.

  There are hundreds to thousands of types of alarms in the numerical control device that notify when an abnormality occurs. When an abnormality occurs in the numerical control device or the machine controlled by the numerical control device, an alarm message indicating the content of the abnormality is displayed on a display device included in the numerical control device.

  Among these alarms, there are alarms that occur due to a plurality of causes. Even in the case of an alarm having a plurality of causes, the alarm message generally only displays the resulting abnormality. For example, when an abnormality in which the position error is too large occurs, an alarm message such as “excessive position error” is displayed. The cause of the abnormality can be a plurality of causes such as a motor or amplifier abnormality. For this reason, it takes time to identify the cause of the alarm message generated by a plurality of causes.

  Patent Document 1 discloses a technique of a numerical control device that identifies a cause among a plurality of causes that cause an alarm by the numerical control device itself and displays the result. In the technique of the numerical control device disclosed in Patent Document 1, although the display itself is easy to understand, the content of the message becomes enormous, and a large amount of storage device (memory) for storing these messages is required. .

  In addition, in order to leave a history of occurrence of anomalies, if a message having such a large amount of messages is to be traced back to a long time in the past, a large amount of storage device (memory) is required.

JP-A-7-234987

  When a plurality of causes can be considered as the cause of occurrence of an alarm, it takes time for the operator of the numerical controller to specify the cause of occurrence of the alarm only by displaying the resulting alarm message.

When the cause of the abnormality can be analyzed, a large amount of memory is required to prepare an alarm message for each cause of the abnormality and store it in the numerical controller. Also, when storing the cause of an abnormality and an alarm message as a history, if the message content is complicated, a large amount of memory is required to leave all information. Therefore, there is a problem that the numerical control device becomes large and expensive.
On the other hand, although there are many alarm messages themselves, the alarm messages and additional information for identifying the cause of the abnormality itself are directly related to the functions of the original numerical control device for controlling machines such as machine tools and industrial machines. Not what you want.

  Therefore, the present invention is to provide a numerical control apparatus having an alarm cause display function capable of reducing information related to an alarm and saving a memory for storing the information.

The invention according to claim 1 of the present application relates to a numerical control device or a numerical control device having a function of detecting an abnormality of a machine controlled by the numerical control device, and an abnormality in an operation state generated in the numerical control device or the machine. Alarm message storage means for storing an alarm message representing the above, and additional information storage means for storing information identifying the cause of the abnormality as additional information represented by Arabic numerals, alphabets, or a combination of Arabic numerals and alphabets, A message creation means for creating a message by selecting an alarm message and additional information corresponding to the abnormality from the alarm message storage means and the additional information storage means when an abnormality occurs in the numerical control device or the machine; ,
A numerical control apparatus having an alarm cause display function, comprising display means for displaying a message comprising an alarm message and additional information created by the message creation means.

  The invention according to claim 2 has the alarm cause display function according to claim 1, further comprising an abnormality occurrence history storage means for storing, as history information, a message comprising the alarm message created by the message creation means and additional information. It is a numerical control device.

  The invention according to claim 3 is the numerical control apparatus having an alarm cause display function according to claim 1, wherein the additional information is formed according to a predetermined system.

According to the present invention, it is possible to provide a numerical control device having an alarm cause display function that saves a memory for storing information related to hundreds to thousands of alarms of the numerical control device.
Further, according to the present invention, by adding simple additional information indicating the cause of the alarm to the alarm message, it is possible to display the cause of the alarm with a small amount of memory.
It is also possible to provide a numerical control device having an alarm cause display function that can leave alarm messages and additional information together as history information, and can enhance the history of abnormality information even with a small amount of memory. it can.

  The additional information used in the present invention is configured according to a predetermined system, so that the numerical control device and the machine operator can quickly grasp the outline of the cause of the alarm.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram for explaining the present invention. The numerical control device 10 having an alarm cause display function according to the present invention instructs the amplifier 3 to drive the drive command 7 by analyzing and executing the machining program. The amplifier 3 drives the motor 4 based on the drive command 7. Then, position / speed information by a position / speed detector (not shown) provided in the motor 4 is input to the numerical controller 10 as feedback information 8.

  Control software 1 is incorporated in the numerical controller 10. The control software 1 includes an alarm detection unit 1a, an alarm cause estimation unit 1b, and a message creation unit 1c. When an abnormality occurs in a peripheral device such as a numerical control device 10 or a machine tool or an industrial machine connected to the numerical control device 10, the control software 1 detects the abnormality by the alarm detection unit 1a, and an alarm cause estimation unit The cause of the alarm is specified by 1b. When the cause of the alarm is specified, the control software 1 requests to read out the alarm message and additional information from the memory 5A (alarm message and additional information read request 9a), and requests the display device 2 to display the message, or the memory 5B. Request to store the alarm occurrence history (alarm history storage request 9b). The control software 1 is software that is incorporated in a ROM 12 (see FIG. 4) of the numerical controller 10 described later.

  FIG. 2 is a diagram for explaining an outline of information stored in the memory 5A and the memory 5B shown in FIG. The memory 5A has an alarm message storage area 5Aa and an additional information storage area 5Ab. On the other hand, the memory 5B has an alarm occurrence history storage area 5Bc. The memory 5A shown in FIG. 1 is composed of a ROM as an example. On the other hand, the memory 5B is configured by SRAM as an example. SRAM is a kind of RAM that can write and read data. In the numerical controller 10 (see FIG. 4) having the alarm cause display function of the present invention, the SRAM 13 is backed up by a battery and functions as a nonvolatile memory.

  FIG. 3 shows an example of an alarm message displayed on the display device 2 provided in the numerical controller 10 and a message composed of additional information.

  A correspondence table explaining the additional information added to the alarm message displayed on the display device 2 shown in FIG. 1 and the meaning of the information is created in advance as a manual or the like. For the manual, a paper medium, an electronic medium storing a PDF file, or the like is used.

  An operator who operates the numerical control device 10 or a machine controlled by the numerical control device 10 can find out the meaning content related to the additional information displayed on the display device 2 from a manual or the like. By doing so, it is possible to save the memory built in the numerical controller 10 and use it for more effective processing.

The additional information is created according to a predetermined system. For example, combining alphabets and Arabic numerals, if the cause of the abnormality is an amplifier, the prefix is “A”, if the motor is “A”, the prefix is “B”, and if the detector is a detector, the prefix is “C”. Create a system,
A1: Amplifier transistor module abnormality A2: Amplifier current detection element abnormality B1: Motor winding short circuit B2: Motor winding disconnection C1: Detector output signal abnormality C2: Excessive noise in detector output signal When the causes are classified as mixing, the numerical control device and the machine operator can immediately grasp the outline of the cause of the alarm by simply looking at the prefix.

  FIG. 4 is a schematic block diagram of an embodiment of the numerical controller 10 having an alarm cause display function according to the present invention. In FIG. 4, a numerical control device 10 is a device that controls machines such as machine tools and industrial machines. The processor (CPU) 11 is a processor that controls the numerical controller 10 as a whole. The processor (CPU) 11 reads a system program stored in the ROM 12 via the bus 20 and controls the numerical controller 10 as a whole in accordance with this system program.

  The system program stored in the ROM 12 includes various programs for executing an edit mode process necessary for creating and editing a machining program and a reproduction mode process for automatic operation. The ROM 12 stores a numerical control device 10, a program for detecting an abnormality of a machine tool or an industrial machine controlled by the numerical control device 10, a storage in the SRAM 13 when an abnormality is detected, and a data from the SRAM 13. A transfer program for performing the transfer is stored. Further, as described above, the ROM 12 stores alarm messages and additional information in respective storage areas in advance.

  The SRAM 13 is a kind of RAM that can write and read data. As described above, the SRAM 13 has a storage area of the alarm occurrence history storage area 5Bc (see FIG. 2B). As an example, the memory 5B shown in FIG.

  The SRAM 13 is backed up by a battery (not shown) and functions as a nonvolatile memory. Temporary calculation data and various data input by the operator via the LCD / MDI unit 21 are stored in the data area.

  Further, the SRAM 13 stores a machining program read via the interface 14, a machining program input via the LCD / MDI unit 21, and the like. The LCD / MDI unit 21 is composed of a liquid crystal display device and a manual input device.

  The interface 14 is an interface for an external device that can be connected to the numerical control device 10, and is connected to an external device 23 such as an input / output unit or an external storage device. A machining program or the like is read from the input / output means or the external storage device, and the machining program edited in the numerical controller 10 can be output to the input / output means or the external storage device.

  A PMC (programmable machine controller) 15 controls an auxiliary device on the processing machine side, for example, an actuator for tool change, by a sequence program built in the numerical controller 10. For example, in accordance with the M function, S function, and T function commanded by the machining program, these sequence programs convert the signals into necessary signals on the auxiliary device side and output them from the I / O unit 16 to the auxiliary device side. Auxiliary devices such as various actuators are activated by this output signal.

  Image signals such as the current position of each axis of the machine tool, alarms, parameters, and image data are sent to the LCD / MDI unit 21 and displayed on a display comprising a liquid crystal display device provided in the LCD / MDI unit 21. The LCD / MDI unit 21 is an input device provided with a display, a keyboard, and the like.

  The interface 18 receives data from the keyboard of the LCD / MDI unit 21 and passes it to the processor (CPU) 11. When an abnormality occurs in the numerical control device 10 or the machine controlled by the numerical control device 10, an alarm cause including an alarm type and additional information described later is displayed on the display screen of the LCD / MDI unit 21, and numerical values are displayed. The occurrence of an abnormality in the control device 10 or the like is notified.

  Interface 19 is connected to manual pulse generator 22 and receives pulses from manual pulse generator 22. The manual pulse generator 22 is mounted on the operation panel of the machine tool main body, and is used to precisely position the movable part of the machine tool by controlling each axis by a distribution pulse based on manual operation.

  The axis control circuits 30 to 50 receive the movement command for each axis from the processor (CPU) 11 and output the command for each axis to the servo amplifiers 31 to 51. In response to this command, the servo amplifiers 31 to 51 drive the servo motors 32 to 52 of each axis of the machine tool. In this case, each of the servo motors 32 to 52 is used to drive the linear movement axes X, Y, and Z for table movement.

  The servomotors 32 to 52 for each axis incorporate a detector for position / speed detection, and position data from this detector is fed back to the axis control circuits 30 to 50 respectively. Note that the position data can generate speed data by taking a difference. In FIG. 4, description of these position / velocity feedback signals is omitted.

  The spindle control circuit 60 receives a spindle rotation command to the machine tool from the processor (CPU) 11 and outputs a spindle speed command to the spindle amplifier 61. Upon receiving this spindle speed command, the spindle amplifier 61 rotates the spindle motor 62 at the cutting rotational speed commanded to the machine tool. A position coder is connected to the spindle motor 62 by a gear or a belt, and the position coder outputs a feedback pulse in synchronism with the rotation of the spindle. Read. In FIG. 4, the configuration related to these feedback pulses is omitted.

  The bus 20 is connected to an I / O unit 17 that exchanges signals with a signal transmission path. A network and a telephone line are connected to the other side of the I / O unit 17.

When an abnormality occurs in the numerical control device 10 or the like, the processor (CPU) 11 performs analysis used for abnormality analysis such as alarm information, parameters of the numerical control device 10 when the abnormality occurs, data such as operation history until the abnormality occurs, and the like. Data can be read from the SRAM 13 and stored in the SRAM 13 as alarm cause occurrence history information.
Thus, by adopting simplified and systematized additional information, it is possible to reduce storage devices such as ROM and SRAM, and the additional information can be derived from alphabets, Arabic numerals, or combinations thereof. Because it is configured, when an abnormality occurs in the numerical control device, peripheral devices, or the machine controlled by the numerical control device, a common display is possible regardless of the language used, enabling efficient maintenance and inspection work. .

  FIG. 5 is an example of a flowchart showing an algorithm executed by the control software 1. Hereinafter, it demonstrates according to each step. The numerical controller 10 always diagnoses the operation state of the numerical controller 10 and the machine controlled by the numerical controller 10 using the control software 1 (step S1). If there is an abnormality (alarm) by diagnosis (step S2), the cause of the abnormality (alarm) is estimated (step S3). Based on the estimation result of step S3, the alarm message and additional information stored in the ROM 12 of the numerical controller 10 are read out and a message is created (step S4). The created message is displayed on the display device 2 (step S5), and the process ends.

  FIG. 6 is another example of a flowchart showing an algorithm executed by the control software 1. The flowchart includes storing a message. Hereinafter, it demonstrates according to each step. The numerical controller 10 always diagnoses the operation state of the numerical controller 10 and the machine controlled by the numerical controller 10 using the control software 1 (step T1). If there is an abnormality (alarm) by diagnosis (step T2), the cause of the abnormality (alarm) is estimated (step T3). Based on the estimation result of step T3, the alarm message and additional information stored in the ROM 12 of the numerical controller 10 are read out and a message is created (step T4). The created message is stored in the SRAM 13 as abnormality (alarm) occurrence history information, and the process ends (step T5). The abnormality (alarm) occurrence history information stored as history information can be displayed on the display device 2 or stored in a storage device outside the numerical control device 10 by a predetermined operation by the operator.

It is a schematic block diagram for demonstrating this invention. It is a figure explaining the outline of the information stored in the memory 5A shown in FIG. 1, and the memory 5B. 3 is an example of an alarm displayed on a display device 2 provided in the numerical controller 10. It is a schematic block diagram of embodiment of the numerical control apparatus 10 which has an alarm cause display function which is this invention. It is an example of the flowchart which shows the algorithm which the control software 1 performs. It is another example of the flowchart which shows the algorithm which the control software 1 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control software 2 Display apparatus 3 Amplifier 4 Motor 5A Memory 5Aa Alarm message storage area 5Ab Additional information storage area 5B Memory 5Bc Alarm generation history storage area 6 Message display request 7 Drive command 8 Feedback information 9a Alarm message and additional information read request 9b Alarm History storage request 10 Numerical control device 11 Processor (CPU)
12 ROM
13 SRAM
14 Interface 15 PMC (Programmable Machine Controller)
16 I / O unit 17 I / O unit 18 Interface 19 Interface 20 Bus 21 LCD / MDI unit 22 Manual pulse generator 23 External device 30, 40, 50 Axis control circuit 31, 41, 51 Servo amplifier 32, 42, 52 Servo Motor 60 Spindle control circuit 61 Spindle amplifier 62 Spindle motor

Claims (3)

In a numerical control device or a numerical control device having a function of detecting an abnormality of a machine controlled by the numerical control device,
An alarm message storage means for storing an alarm message representing an abnormality in an operating state generated in the numerical control device or the machine;
Additional information storage means for storing information identifying the cause of the abnormality as additional information represented by Arabic numerals, or alphabets, or a combination of Arabic numerals and alphabets;
When an abnormality occurs in the numerical control device or the machine, a message creating unit that creates a message by selecting an alarm message and additional information corresponding to the abnormality from the alarm message storage unit and the additional information storage unit;
A numerical control apparatus having an alarm cause display function, comprising: display means for displaying a message comprising an alarm message and additional information created by the message creation means.   2. The numerical control device having an alarm cause display function according to claim 1, further comprising an abnormality occurrence history storage unit that stores an alarm message generated by the message generation unit and a message including additional information as history information.   The numerical control apparatus having an alarm cause display function according to claim 1, wherein the additional information is formed according to a predetermined system.

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