JP2022154035A - Numerical control device and machine tool - Google Patents

Abstract

To provide a numerical control device and a machine tool that can identify a cause of an abnormality when an image does not appear on a display device.SOLUTION: A numerical control device 11 comprises an operation panel 12, a control unit 30, and a transmission line 52. The control unit 30 outputs an image signal to the operation panel 12. The transmission line 52 is connected between the operation panel 12 and the control unit 30, and transmits the image signal output from the control unit 30 to the operation panel 12. The control unit 30 transmits a test signal to the operation panel 12 via the transmission line 52. The operation panel 12 determines whether or not the test signal from the control unit 30 has been received. The operation panel 12 determines whether or not the image signal has been received from the control unit 30 within a predetermined timer time. The control unit 30 identifies a cause of an abnormality in which an image corresponding to the image signal is not displayed on a display unit 20 based on a determination result of whether or not the test signal has been received and a determination result of whether or not the image signal has been received.SELECTED DRAWING: Figure 3

Description

The present invention relates to numerical controllers and machine tools.

A machine tool disclosed in Patent Document 1 has a control panel and an operation panel fixed to the outside of a machine body that performs machining inside. A transmission line connects the control panel and the operation panel. A signal output section of the control panel outputs an image signal through a transmission line.

JP 2020-155027 A

In machine tools, there are cases where the operation panel and the control panel are far away from each other. A transmission line without a locking mechanism is likely to come loose due to vibrations that occur during machining. When the display stops displaying images, the user cannot determine which of the display, the control panel, and the transmission line has failed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a numerical controller and a machine tool that can identify the cause of an abnormality in which no image is displayed on a display device.

A numerical control device according to claim 1, further comprising: a display device; a control unit for outputting an image signal to the display device; and a transmission line for transmission to a display device, wherein the control section includes a signal transmission section for transmitting a test signal to the display device via the transmission line, and the signal transmission section transmits the test signal to the transmission line. a first determination unit for determining whether or not the display device has received the test signal transmitted to the display device via the display device, and whether or not the display device has received the image signal from the control unit within a predetermined time a second determination unit that determines whether or not an image corresponding to the image signal is displayed on the display device based on the determination result of each of the first determination unit and the second determination unit; and If an abnormality occurs in which an image is not displayed on the display device, the numerical controller can identify the cause of the abnormality, so that the abnormality can be dealt with promptly.

In the numerical control device according to claim 2, when the first determining unit determines that the display device has not received the test signal, the specifying unit specifies that the cause is an abnormality in the transmission line. When the first determination unit determines that the display device has received the test signal, and the second determination unit determines that the display device has not received the image signal within the predetermined time, the cause is An abnormality in the control unit may be specified. If an abnormality occurs in which no image is displayed on the display device, the numerical controller can identify the abnormality in the transmission line or in the control section, so that the cause of the abnormality can be quickly dealt with. An abnormality in the transmission line is, for example, a disconnection or disconnection of the transmission line from the display device.

A numerical control device according to claim 3, further comprising a receiving unit that receives that the display device is abnormal, and the identifying unit determines that the first determination unit has not received the test signal from the display device. and when the second determination unit determines that the display device has received the image signal within the predetermined time and the reception unit receives the abnormality, the cause is identified as the abnormality of the display device. good too. When an abnormality occurs in which no image is displayed on the display device, the numerical controller determines that it is neither an abnormality in the transmission line nor an abnormality in the control unit, and the reception unit accepts that the display device is abnormal. , the cause of the anomaly is specified as an anomaly of the display device. Therefore, when an abnormality occurs in which an image is not displayed on the display device, the numerical control device can specify which of the transmission line abnormality, the control unit abnormality, and the display device abnormality is the cause.

A numerical control apparatus according to claim 4 may further include a notification unit for notifying the identification result of the identification unit. When an abnormality occurs in which an image is not displayed on the display device, the user can know the cause of the abnormality, so that the recovery operation can be performed quickly according to the identified cause.

6. The numerical controller according to claim 5, wherein said display device comprises a transistor switch between said transmission line, said transistor switch being turned on when said test signal is input via said transmission line. is turned off when is not input, and the first determination unit may determine whether or not the display device has received the test signal based on the on/off state of the transistor switch. The numerical controller can quickly detect whether or not the test signal is received by using the transistor switches of the display device.

The numerical control device according to claim 6 further comprises a communication line connected between the control unit and the display device to perform communication between the control unit and the display device, and the display device communicates with the first determination unit. The second determination section is provided, the control section includes the identification section, and the first determination section transmits a determination result as to whether or not the test signal has been received to the control section via the communication line. and the second determination unit transmits a determination result as to whether or not the image signal has been received to the control unit via the communication line, and the specifying unit transmits the determination result as to whether or not the image signal has been received to the control unit via the communication line. The cause of the abnormality may be specified based on each of the determination results received from the second determination unit. The presence or absence of reception of the test signal and the presence or absence of reception of the image signal are determined on the display device side. The display device transmits each determination result to the control unit through a communication line. The control unit identifies the cause of the abnormality based on the received determination result. Therefore, even if the display device and the control unit are separated from each other, in the event that an image does not appear on the display device, the control unit can accurately and quickly identify the cause of the abnormality. By determining whether or not the display device receives the test signal and the image signal on the display device side, the determination accuracy can be improved and the determination can be made quickly. The numerical controller can accurately and quickly identify the cause of the abnormality by sharing the determination of the presence or absence of reception of the test signal and the image signal and the identification of the cause of the abnormality between the display device and the control unit.

A machine tool according to claim 7 is provided with a machine part for machining a work material, and a numerical controller according to any one of claims 1 to 6 for controlling the operation of the machine part. The display device is provided on one side, and the control section is provided on the other side of the mechanical section. In the case of a machine tool in which the display device and the control unit are separated from each other with the machine part sandwiched between them and are connected by a transmission line, the transmission line may come loose from the display device if the transmission line does not have a locking mechanism. be. The larger the mechanical part, the greater the vibration during machining, and the easier it is for the transmission line to come off. Even in such a large-sized machine tool, if an abnormality occurs in which an image is not displayed on the display device, the cause of the abnormality can be specified, so that prompt action can be taken.

2 is a perspective view of the machine tool 1; FIG. Schematic side view of machine tool 1 . 2 is a block diagram showing an electrical configuration of the machine tool 1; FIG. FIG. 4 is a diagram showing a state in which a connector 52A of a transmission line 52 is removed from an operation board 26; The flowchart of the control panel side monitoring process. 4 is a flowchart of device-side monitoring processing;

Embodiments of the present invention will be described. Hereinafter, the left and right, front and rear, and top and bottom of the machine tool 1 will be described with reference to the directions of the arrows shown in the drawings.

The configuration of the machine tool 1 will be described with reference to FIGS. 1 and 2. FIG. The machine tool 1 includes a machine section 10 , a numerical controller 11 and an operation panel 12 . The mechanical part 10 has a substantially rectangular parallelepiped shape and has a space (not shown) inside. The operator arranges the work material to be machined in the space inside the machine section 10 . The machine part 10 has a spindle in space. A machine part 10 performs machining on a work material with a tool attached to a spindle inside. Machining is, for example, milling, drilling, tapping, cutting, and the like.

A numerical controller 11 is provided on the back of the mechanical section 10 and controls each operation of the mechanical section 10 and the operation panel 12 . The numerical controller 11 outputs image signals of various images to the operation panel 12 . The image signal is a pulsed electrical signal conforming to standards such as HDMI (registered trademark) (High-Definition Multimedia Interface) and DVI (Digital Visual Interface). The image is an image prompting the operator to operate, for example, an image showing setting values necessary for machining.

The machine tool 1 is provided with an operation panel 12 on the front surface of the machine section 10 . The operation panel 12 has a display section 20, an operation section 21, a reset key 23, and an LED 24. FIG. The display unit 20 is a liquid crystal display, and displays an image based on the image signal output by the numerical controller 11 . The operation unit 21 includes buttons, switches, a touch panel, and the like. The operation panel 12 has a touch panel on the display section 20 . As will be described later, the reset key 23 is pressed by the operator to input an abnormality of the display unit 20 when the LED 24 is turned off while the screen of the display unit 20 is blank. The operator operates the operation section 21 while viewing the image displayed by the display section 20 . The operation panel 12 outputs operation signals to the numerical controller 11 . The operation signal is a signal indicating the content of the operation performed by the operator on the operation unit 21 . The numerical controller 11 generates a control signal indicating the content of machining based on the content of the operation indicated by the operation signal, and outputs the control signal to the machine section 10 .

As shown in FIG. 2, the operation panel 12 and the numerical controller 11 are opposed to each other in the longitudinal direction with the mechanical section 10 interposed therebetween. The machine tool 1 has a communication line 51 and a transmission line 52 . The communication line 51 is, for example, a LAN (Local Area Network) cable and passes through the mechanical section 10 . The communication line 51 has connectors 51A and 51B at both ends in the length direction. The connector 51A is connected to the later-described communication section 25 (see FIG. 3) of the operation panel 12, and the connector 51B is connected to the later-described communication section 36 of the numerical controller 11 (see FIG. 3). A communication line 51 transmits an operation signal. The transmission line 52 is, for example, a cable and passes through the mechanical section 10 . The transmission line 52 has connectors 52A and 52B at both longitudinal ends. The connector 52A is connected to the connection portion 261 (see FIG. 3) of the operation board 26 of the operation panel 12, and the connector 52B is connected to the connection portion 301 of the numerical controller 11 (see FIG. 3). A transmission line 52 transmits an image signal. The operation panel 12 and the numerical controller 11 are connected by a communication line 51 and a transmission line 52 . Note that the communication line 51 and the transmission line 52 do not have to pass through the mechanical section 10 .

The electrical configuration of the machine tool 1 will be described with reference to FIG. As described above, the machine tool 1 includes the machine section 10, the numerical controller 11, and the operation panel 12. As shown in FIG. The mechanical part 10 comprises a working part 15 . The operation unit 15 includes a motor, an encoder (not shown), and the like. A motor is, for example, a drive source for a main shaft and a moving mechanism. The spindle mounts the tool and rotates at high speed. The moving mechanism relatively moves the main shaft and the workbench (not shown) in the directions of three axes (X-axis, Y-axis, Z-axis). The workbench supports the work piece. The encoder detects the rotation angle of each corresponding motor.

The numerical controller 11 has a control section 30 . The control unit 30 includes a CPU 31, a ROM 32, a RAM 33, a flash memory 34, an input/output unit 35, a communication unit 36, a connection unit 301, and the like. CPU 31 is connected to ROM 32 , RAM 33 , flash memory 34 , input/output section 35 , communication section 36 and connection section 301 via bus 37 . A CPU 31 controls the operation of the machine tool 1 . The ROM 32 stores a device-side monitoring program and the like. The device-side monitoring program executes device-side monitoring processing (see FIG. 6), which will be described later. The CPU 31 outputs an image signal after a certain period of time (for example, ten seconds to several tens of seconds) has elapsed after the power is turned on.

The input/output section 35 is electrically connected to the operating section 15 of the mechanical section 10 . The input/output unit 35 outputs control signals from the CPU 31 to the operation unit 15 . The control signal indicates the content of machining. The operation unit 15 operates based on the control signal. Therefore, the machine section 10 performs machining on the work material according to the content indicated by the control signal. The operating section 15 outputs the detection signal of the encoder to the input/output section 35 . The CPU 31 estimates the positions of the spindle and the workpiece based on the detection signal received by the input/output unit 35 . The communication section 36 is connected to the communication section 25 of the operation panel 12 via the communication line 51 .

The operation panel 12 includes a display section 20, an operation section 21, a reset key 23, an LED 24, a communication section 25, an operation board 26, and the like. The operation board 26 is connected to the display section 20 and connected to the operation section 21 , the reset key 23 , the LED 24 and the communication section 25 via the bus 29 . The LED 24 emits light in various patterns according to the cause of the abnormality specified in the device-side monitoring process (see FIG. 6), which will be described later. The communication section 25 is connected to the communication section 36 of the numerical control device 11 via the communication line 51 .

The operation board 26 includes an FPGA 27, a transistor switch 28, a connection section 261, and the like. FPGA 27 controls the operation of operation panel 12 . The FPGA 27 receives the image signal output from the numerical controller 11 by the communication section 25 and outputs it to the display section 20 . The FPGA 27 outputs the operation signal received by the operation unit 21 from the communication unit 25 to the numerical controller 11 . A non-volatile memory (not shown) attached to the FPGA 27 stores a control panel side monitoring program and the like. The control panel side monitoring program executes a control panel side monitoring process (see FIG. 5), which will be described later. Transistor switch 28 is well known to have a switching function. The base of transistor switch 28 is connected to connection 261 . The emitter of transistor switch 28 is connected to ground. The collector of transistor switch 28 connects to FPGA 27 . A 3.3 V power supply is connected to the portion where the collector and the FPGA 27 are connected.

A connector 51A of the communication line 51 is connected to the communication section 25 of the operation panel 12, and a connector 51B is connected to the communication section 36 of the numerical controller 11. FIG. The connector 52A of the transmission line 52 is connected to the connection portion 261 of the operation board 26, and the connector 52B is connected to the connection portion 301 provided in the control portion 30. FIG.

The cause of the screen disappearance abnormality of the display unit 20 will be described with reference to FIGS. 3 and 4. FIG. There are three main causes of the screen disappearance abnormality, which are any of the transmission line 52 abnormality, the control section 30 abnormality, and the display section 20 abnormality. As described above, the operation panel 12 and the numerical control device 11 are provided opposite to the mechanical section 10, so they are separated from each other in the longitudinal direction (see FIGS. 1 and 2). Therefore, the transmission line 52 must pass over a long distance (for example, 5 m or more) between the operation panel 12 and the numerical controller 11 . A general transmission line 52 without locking mechanisms in the connectors 52A and 52B may be easily pulled out of the connecting portions 261 and 301. FIG. The disconnection of the transmission line 52 may occur, for example, due to deterioration or damage due to long-term use of the connecting portions of the connectors 52A, 52B and the connecting portions 261, 301, vibration generated during machining of the work material in the machine portion 10, and the like. As shown in FIG. 4, if the connector 52A of the transmission line 52 is disconnected from the connection portion 261 of the operation board 26 (see the circle P indicated by the two-dot chain line in FIG. 4), the FPGA 27 will Since the image signal cannot be received from the control unit 30, the screen of the display unit 20 disappears.

When an abnormality occurs in the control unit 30, the image signal cannot be transmitted to the FPGA 27, so the screen of the display unit 20 disappears. When an abnormality occurs in the display unit 20, the screen of the display unit 20 disappears even if the image signal is normally received from the FPGA27. The operator cannot understand the cause of the screen disappearance abnormality just by looking at the display unit 20 where the screen has disappeared. In this embodiment, the FPGA 27 executes operation panel side monitoring processing (see FIG. 5), which will be described later, and the CPU 31 executes device side monitoring processing (see FIG. 6), which will be described later. As a result, when the screen of the display unit 20 disappears, the numerical controller 11 identifies the cause of the abnormality, and notifies the cause by emitting light from the LED 24 provided on the operation panel 12 according to the identified cause of the abnormality.

The control panel side monitoring process will be described with reference to FIG. When the machine tool 1 is powered on, the FPGA 27 of the operation panel 12 reads the operation panel side monitoring program from the non-volatile memory and executes this processing. The FPGA 27 sets a timer (S11). The set time of the timer (hereinafter referred to as timer time) is preferably set to the time until the CPU 31 starts outputting the image signal to the FPGA 27, and is, for example, 10 seconds to several tens of seconds. The CPU 31 transmits the test signal through the transmission line 52 toward the FPGA 27 . The test signal is, for example, a 5V electrical signal (see FIG. 3). The FPGA 27 determines whether the signal input from the transistor switch 28 is LOW (S12).

As shown in FIG. 3 , when the transmission line 52 is not disconnected and is normal, the test signal from the transmission line 52 is input to the gate of the transistor switch 28 provided on the operation board 26 . Therefore, since the transistor switch 28 is turned on, a LOW signal is input from the collector of the transistor switch 28 to the FPGA 27 . Since the signal input to the FPGA 27 is LOW (S12: YES), the FPGA 27 advances the processing to S14 described later.

As shown in FIG. 4, when the connector 52A of the transmission line 52 is disconnected from the connection portion 261 of the operation board 26, the test signal from the transmission line 52 is not input to the gate of the transistor switch 28 provided on the operation board 26. . Therefore, since the transistor switch 28 is turned off, a High signal (3.3 V) is input from the collector of the transistor switch 28 to the FPGA 27 . Since the signal input to the FPGA 27 is High (S12: NO), the FPGA 27 transmits the first signal to the CPU 31 via the communication line 51 (S13). The first signal is a signal indicating that the FPGA 27 has not received the test signal. The FPGA 27 terminates this process.

When the signal input to the FPGA 27 is LOW (S12: YES), the FPGA 27 determines whether it has received an image signal transmitted from the CPU 31 via the transmission line 52 (S14). When the image signal is received (S14: YES), the FPGA 27 returns to S14 and waits until the image signal is no longer received from the CPU31. If no image signal has been received (S14: NO), the FPGA 27 starts a timer (S15). The FPGA 27 determines whether the image signal has been received from the CPU 31 before the timer expires (S16).

If the image signal has not been received (S16: NO), the screen of the display unit 20 has disappeared. Since the image signal that should be transmitted at the predetermined cycle from the CPU 31 has not been received, the FPGA 27 transmits the second signal to the CPU 31 via the communication line 51 (S17). The second signal is a signal indicating that the FPGA 27 has not received the image signal. The FPGA 27 terminates this process.

If an image signal has been received (S16: YES), the FPGA 27 determines whether the reset key 23 has been pressed (S18). For example, when the screen is normally displayed on the display unit 20, the operator does not press the reset key 23 (S18: NO), so the CPU 31 returns to S14 and repeats the above processing. When the screen of the display section 20 disappears, the display section 20 may be out of order. Therefore, the operator presses the reset key 23 to input the abnormality of the display section 20 . Since the reset key 23 has been pressed (S18: YES), the FPGA 27 transmits a reset signal to the CPU 31 via the communication line 51 (S19). The reset signal is a signal indicating that the reset key 23 has accepted the depression. The FPGA 27 terminates this process.

The apparatus-side monitoring process will be described with reference to FIG. When the machine tool 1 is powered on, the CPU 31 of the numerical control device 11 reads the device-side monitoring program from the ROM 32 and executes this processing. The CPU 31 transmits the test signal to the FPGA 27 via the transmission line 52 (S21). The CPU 31 determines whether the first signal has been received from the FPGA 27 via the communication line 51 (S22). If the first signal has been received (S22: YES), the FPGA 27 has not received the test signal. The LED 24 is flashed at high speed (S24). High-speed blinking is a light emission pattern when the transmission line 52 is abnormal. Therefore, by confirming that the LED 24 is blinking at high speed in a state where the screen of the display part 20 has disappeared, the operator can know that the screen of the display part 20 has disappeared due to the abnormality of the transmission line 52.例文帳に追加The CPU 31 terminates this process.

When the first signal is not received (S22: NO), the CPU 31 determines whether the second signal is received from the FPGA 27 via the communication line 51 (S25). When the second signal is received (S25: YES), the FPGA 27 has not received the image signal within the predetermined timer time, and the transmission line 52 is normal, so the CPU 31 controls the cause of the screen disappearance abnormality. An abnormality in the unit 30 is identified (S26), and the LED 24 provided on the operation panel 12 blinks at a low speed (S27). Low-speed blinking is a light emission pattern when the control unit 30 is abnormal. Therefore, by confirming that the LED 24 is blinking at a low speed in the state where the screen of the display part 20 has disappeared, the operator can know that the screen of the display part 20 has disappeared due to the abnormality of the control part 30. - 特許庁The CPU 31 terminates this process.

When neither the second signal is received (S25: NO), the CPU 31 determines whether a reset signal has been received from the FPGA 27 via the communication line 51 (S28). If the reset signal is not received either (S28: NO), the CPU 31 returns to S25 and repeats the above process. When the reset signal is received (S28: YES), the CPU 31 identifies the cause of the screen blanking abnormality as the abnormality of the display section 20 (S29), and normally lights the LED 24 provided on the operation panel 12 (S30). Normal lighting is a light emission pattern when the display unit 20 is abnormal. Therefore, the worker can know that the screen of the display part 20 has disappeared due to the abnormality of the display part 20 by confirming that the LED 24 is normally lit while the screen of the display part 20 has disappeared. The CPU 31 terminates this process.

In the above description, the operation panel 12 is an example of the display device of the present invention. The CPU 31 that executes the processing of S21 in FIG. 6 is an example of the signal transmitting section of the present invention. The FPGA 27 that executes the processes of S12 and S13 in FIG. 5 is an example of the first determination section of the present invention. The FPGA 27 that executes the processes of S16 and S17 is an example of the second determination section of the present invention. The CPU 31 that executes the processes of S22, S23, S25, S26, S28, and S29 in FIG. 6 is an example of the identification unit of the present invention. The reset key 23 is an example of the reception section of the present invention. The CPU 31 that executes the processes of S24, S27, and S30 in FIG. 6 is an example of the notification section of the present invention.

As described above, the numerical controller 11 of this embodiment includes the operation panel 12 , the control section 30 and the transmission line 52 . The operation panel 12 has a display section 20 . The control unit 30 outputs image signals to the operation panel 12 . The transmission line 52 is connected between the control panel 12 and the control section 30 and transmits an image signal output from the control section 30 to the control panel 12 . The control unit 30 transmits test signals to the operation panel 12 via the transmission line 52 . The operation panel 12 determines whether or not the test signal from the control section 30 has been received. The operation panel 12 determines whether or not the image signal has been received from the control section 30 within a predetermined timer time. The control unit 30 identifies the cause of the abnormality in which the image corresponding to the image signal is not displayed on the display unit 20 based on the determination result of whether or not the test signal has been received and the determination result of whether or not the image signal has been received. When an abnormality occurs in which an image is not displayed on the display unit 20, the numerical controller 11 can identify the cause of the abnormality, so that the abnormality can be dealt with promptly.

When the control unit 30 determines that the operation panel 12 has not received the test signal, the cause of the abnormality is specified as the abnormality of the transmission line 52 . When the control unit 30 determines that the operation panel 12 has received the test signal and determines that the operation panel 12 has not received the image signal within the predetermined timer time, the cause of the abnormality is specified as the abnormality of the control unit 30. do. When an abnormality occurs in which an image is not displayed on the display unit 20, the numerical controller 11 can identify an abnormality in the transmission line 52 or an abnormality in the control unit 30, so that it is possible to promptly respond according to the cause of the abnormality.

The operation panel 12 has a reset key 23 . When the operator presses the reset key 23, the operation panel 12 accepts that the display section 20 is abnormal. The CPU 31 determines that the operation panel 12 has not received the test signal, determines that the operation panel 12 has received the image signal within the predetermined timer time, and detects the abnormality of the display section 20 by pressing the reset key 23. If accepted, the cause of the abnormality is identified as the abnormality of the display unit 20 . Therefore, when an abnormality occurs in which an image is not displayed on the display unit 20, the numerical controller 11 can accurately identify which of the abnormality in the transmission line 52, the control unit 30, and the display unit 20 is the cause. .

The CPU 31 notifies the identification result of the cause of the abnormality by the light emission pattern of the LED 24 . When an abnormality occurs in which an image is not displayed on the display unit 20, the operator can grasp the cause of the abnormality from the light emission pattern of the LED 24, so that the recovery operation can be performed quickly according to the identified cause of the abnormality.

The control panel 12 has a transistor switch 28 between it and the transmission line 52 . The transistor switch 28 is turned on when a test signal is input through the transmission line 52 and turned off when no test signal is input. The operation panel 12 determines whether or not the test signal has been received based on the ON/OFF state of the transistor switch 28 . Therefore, by using the transistor switch 28, the numerical controller 11 can quickly detect an abnormality such as disconnection or disconnection of the transmission line 52. FIG.

The numerical controller 11 has a communication line 51 . A communication line 51 is connected between the control unit 30 and the operation panel 12 to perform communication between the control unit 30 and the operation panel 12 . The FPGA 27 of the operation panel 12 determines whether or not the operation panel 12 has received the test signal and whether or not the image signal has been received. The control unit 30 identifies the cause of the abnormality. When the FPGA 27 determines that it has not received the test signal, it transmits the first signal to the control section 30 via the communication line 51 . When the FPGA 27 determines that the operation panel 12 has not received the image signal within the predetermined timer time, it transmits a second signal to the control section 30 via the communication line 51 . The CPU 31 identifies the cause of the abnormality based on the first signal or second signal received via the communication line 51 . Therefore, even if the operation panel 12 and the control unit 30 are separated from each other, when an abnormality occurs in which an image is not displayed on the display unit 20, the control unit 30 can accurately and quickly identify the cause of the abnormality.

Since the machine tool 1 has a large machine part 10 compared to a small machine tool, the transmission line 52 is long and the vibration during machining is large. Therefore, the transmission line 52 is likely to come off. Even in such a large-sized machine tool 1, when an abnormality occurs in which an image is not displayed on the display unit 20, the cause of the abnormality can be identified, so the recovery operation can be speeded up according to the cause of the abnormality.

By determining whether the control unit 30 has received the test signal and the image signal on the control unit 30 side, the determination accuracy can be improved and the determination can be made quickly. The operation panel 12 and the control unit 30 cooperate to determine whether the test signal and the image signal are received or not, and to identify the cause of the abnormality, so that the numerical controller 11 can accurately and quickly identify the cause of the abnormality. .

The present invention is not limited to the above embodiment, and various modifications are possible. In the machine tool 1, the numerical control device 11 and the operation panel 12 are fixed to the front and rear surfaces of the machine section 10, respectively. Alternatively, the numerical controller 11 may be fixed to the back surface of the mechanical section 10 . The lengths of the communication line 51 and the transmission line 52 are not limited, and the respective lengths may be different.

FIG. 4 of the above embodiment shows an example in which the connector 52A of the transmission line 52 is disconnected from the connection portion 261 of the operation board 26. However, if the connector 52B is disconnected from the connection portion 301 of the control section 30, the transmission line 52 is disconnected. Even if this occurs, the numerical control device 11 can identify the abnormality of the transmission line 52 as the cause of the screen disappearance abnormality of the display section 20 .

Although the light emission pattern of the LED 24 is used for notification, other notification methods may be used. For example, a plurality of LEDs corresponding to the number of causes of abnormality may be provided, and the LED corresponding to the identified cause of abnormality may be lit. A light-emitting part other than the LED, for example, Patlite (registered trademark) may be used for notification. In addition to light, a buzzer, an alarm, a voice message, or the like may be used for notification.

In the above-described embodiment, the operation panel 12 side determines whether or not the test signal and the image signal are received, and based on the results of these determinations, the control section 30 identifies the cause of the abnormality. and specific.

Although the FPGA 27 transmits the first signal only when the test signal is not received as a result of determining whether or not the test signal has been received, it may transmit a signal indicating whether or not the test signal has been received. The FPGA 27 transmits the second signal only when the image signal has not been received within a predetermined timer time as a result of determining whether or not the image signal has been received. You may send.

In the above embodiment, instead of the CPU 31 of the numerical controller 11, a microcomputer, ASIC (Application Specific Integrated Circuits), FPGA (Field Programmable Gate Array), or the like may be used as a processor. The device-side monitoring process may be distributed by a plurality of processors. The device-side monitoring program may be downloaded (that is, transmitted as a transmission signal) from a server connected to a net work material (not shown) and stored in the flash memory 34, for example. In this case, the device-side monitoring program may be stored in a non-temporary storage medium such as an HDD provided in the server.

In the above embodiment, instead of the FPGA 27 of the operation panel 12, a CPU, microcomputer, ASIC (Application Specific Integrated Circuits), or the like may be used as the processor. The control panel side monitoring process may be distributed by a plurality of processors. The control panel side monitoring program may be downloaded (that is, transmitted as a transmission signal) from a server connected to a net work material (not shown) and stored in a non-volatile memory attached to the FPGA 27, for example. In this case, the control panel side monitoring program may be stored in a non-temporary storage medium such as an HDD provided in the server.

Reference Signs List 1 machine tool 10 machine section 11 numerical controller 12 operation panel 20 display section 23 reset key 24 LED
28 transistor switch 30 control unit 51 communication line 52 transmission line

Claims (7)

a display device, a control section for outputting an image signal to the display device, and a transmission line connected between the control section and the display device for transmitting the image signal output by the control section to the display device. In a numerical controller equipped with
The control unit includes a signal transmission unit that transmits a test signal to the display device via the transmission line,
a first determination unit that determines whether the display device has received the test signal that the signal transmission unit has transmitted to the display device via the transmission line;
a second determination unit that determines whether the display device has received the image signal from the control unit within a predetermined time;
an identifying unit that identifies a cause of an abnormality in which an image corresponding to the image signal is not displayed on the display device based on the determination results of the first determining unit and the second determining unit. Numerical controller. The specifying unit is
If the first determination unit determines that the display device has not received the test signal, the cause is identified as an abnormality in the transmission line,
When the first determination unit determines that the display device has received the test signal and the second determination unit determines that the display device has not received the image signal within the predetermined time, 2. The numerical controller according to claim 1, wherein the cause is identified as an abnormality in said control unit. A reception unit that receives that the display device is abnormal,
The specifying unit is
The first determination unit determines that the display device has not received the test signal, the second determination unit determines that the display device has received the image signal within the predetermined time, and the reception 3. The numerical controller according to claim 2, wherein when the unit accepts the abnormality, the cause is identified as the abnormality of the display device. 4. The numerical control apparatus according to claim 1, further comprising a notification section that notifies the identification result of the identification section. The display device includes a transistor switch between the transmission line,
The transistor switch is turned on when the test signal is input through the transmission line and turned off when the test signal is not input,
5. The numerical controller according to claim 1, wherein the first determination unit determines whether or not the display device has received the test signal based on whether the transistor switch is turned on or off. . A communication line connected between the control unit and the display device and performing communication between the control unit and the display device,
The display device has the first determination unit and the second determination unit,
The control unit has the specifying unit,
The first determination unit transmits a determination result as to whether or not the test signal has been received to the control unit via the communication line,
The second determination unit transmits a determination result as to whether or not the image signal has been received to the control unit via the communication line,
6. The identification unit identifies the cause of the abnormality based on the determination results received from the first determination unit and the second determination unit via the communication line. Numerical control device according to any one of the above. a machine part for processing a work material;
and the numerical control device according to any one of claims 1 to 6 for controlling the operation of the mechanical part,
The display device is provided on one side of the mechanical section,
A machine tool comprising the control section on the other side of the machine section.

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