JP2021047774A - Numerical control device for industrial machine - Google Patents

Abstract

To safely use, in a numerical control device, data recorded in a USB memory.SOLUTION: A numerical control device that controls an industrial machine is provided with: a data acquisition unit 13 that acquires data about control of the industrial machine; a code creation unit 14 that, for the data about the control of the industrial machine, creates an error code including at least one of an error detection code or an error correction code; a storage unit 16 that stores the error code; an error detection unit 23 that detects an error in the data by use of the error code; and an error handling unit 20 that, in a case where the error detection unit 23 detects the error in the data, handles the error.SELECTED DRAWING: Figure 2

Description

The present invention relates to a numerical control device for an industrial machine.

Conventionally, most programs of numerical control devices are created on a PC (personal computer). The program created on the PC is expanded in the memory of the numerical control device. The numerical control device analyzes the program expanded in the memory and operates the industrial machine. See, for example, Patent Document 1.

USB (Universal Sirial Bus) memory is widely used as a portable storage medium. USB memory is extremely versatile because it is lightweight, does not require a dedicated reading device, and is not affected by the network.

However, a CF card is recommended over a USB memory as a portable storage medium for a numerical control device. The CF card is a card-type portable storage medium including a flash memory and terminals for inputting / outputting the contents stored in the flash memory. In order to use the data recorded on the CF card, a dedicated slot suitable for the type of CF card is required. If the matching slot does not exist on the PC, an external card reader will be required.

JP-A-2019-79336

As described above, USB is a highly versatile portable storage medium. Therefore, it is convenient if the program created by the PC can be stored in the USB and the program stored in the USB can be read out by the numerical control device and used for the operation of the industrial machine.

When the USB memory terminal is inserted into the outlet, the USB memory terminal is fixed to the connector, but since the main body of the USB memory is exposed to the outside, it is affected by mechanical vibrations of numerical control devices and industrial machines. Easy to receive. While reading and writing the data stored in the USB memory, the USB memory may drop out from the connector due to mechanical vibration, resulting in data loss. In order to prevent data loss due to generated vibration, it is restricted to directly use the program stored in the USB memory for the operation of the industrial machine.

Further, in an environment such as a factory, disturbances such as vibration occur, so that even a portable storage medium other than a USB memory may cause data corruption or loss. Even if damage or loss occurs, fail-safe can be ensured by taking measures in advance.

In the field of numerical control devices, a technique for safely using data is desired.

The numerical control device of one aspect of the present disclosure is a numerical control device that controls an industrial machine, and has an error with respect to a data acquisition unit that acquires data related to the control of the industrial machine and data related to the control of the industrial machine. A code creation unit that creates an error code including at least one of a detection code or an error correction code, a storage unit that stores the error code, an error detection unit that detects an error in the data using the error code, and the above. When the error detection unit detects an error in the data, it has an error handling processing unit that performs a process for dealing with the error.

The numerical control system of one aspect of the present disclosure is a control system that controls an industrial machine, and is an error detection for a data acquisition unit that acquires data related to the control of the industrial machine and data related to the control of the industrial machine. A code creation unit that creates an error code including at least one of a code or an error correction code, a storage unit that stores the error code, a detection unit that detects an error in the data using the error code, and the error detection unit. When the unit detects an error, it has an error handling processing unit that performs processing for dealing with the error.

According to one aspect of the present invention, the program on the USB memory can be safely used.

It is a hardware block diagram of the numerical control device in this embodiment. It is a block diagram of the numerical control device in this embodiment. It is a flowchart which shows the operation of a numerical control device. It is a block diagram of the numerical control device in another embodiment. It is a flowchart which shows the operation of the numerical control apparatus in another embodiment. It is a block diagram of the numerical control device in another embodiment. It is a flowchart which shows the operation of the numerical control apparatus in another embodiment. It is a block diagram of the numerical control device in another embodiment. It is a flowchart which shows the operation of the numerical control apparatus in another embodiment. It is a block diagram of the numerical control device in another embodiment.

Hereinafter, an embodiment in which the control device of the present disclosure is mounted on the numerical control device 100 will be shown. In each of the embodiments shown below, a machine tool will be described as an example of an industrial machine controlled by the numerical control device 100, but the present specification relates to a control device for controlling other industrial machines such as a robot and an injection molding machine. It is also possible to apply the techniques described in.

FIG. 1 is a hardware configuration diagram of a numerical control device 100 according to an embodiment.
The CPU 111 included in the numerical control device 100 according to the present embodiment is a processor that controls the numerical control device 100 as a whole. The CPU 111 reads the system program stored in the ROM 112 via the bus 120, and controls the entire numerical control device 100 according to the system program. Temporary calculation data, display data, various data input by the operator via an input unit (not shown), and the like are temporarily stored in the RAM 113.

The non-volatile memory 114 is configured as a memory in which the storage state is maintained even when the power of the numerical control device 100 is turned off, for example, by backing up with a battery (not shown). In the non-volatile memory 114, a program read from the external device 72 via the interface 115, a program input via the input unit 30, various data acquired from each part of the numerical control device 100, a machine tool, etc. (for example, , Setting parameters acquired from the machine tool, etc.) are stored. The programs and various data stored in the non-volatile memory 114 may be expanded in the RAM 113 at the time of execution / use. Further, various system programs such as a known analysis program are written in the ROM 112 in advance.

The interface 115 is an interface for connecting the numerical control device 100 and an external device 72 such as an adapter. Programs, various parameters, etc. are read from the external device 72 side. Further, the programs and various parameters edited in the numerical control device 100 can be stored in the external storage means via the external device 72. The PMC (programmable machine controller) 116 is a sequence program built in the numerical control device 100 to communicate with a machine tool, a robot, a machine tool, a sensor attached to the robot, or the like. Signals are input and output via the O unit 117 for control.

The data read into the memory, the data obtained as a result of executing the program, etc. are output to the display unit 70 via the interface 118 and displayed. Further, the input unit 30 including the MDI, the operation panel, the touch panel, and the like passes commands, data, and the like based on the operation by the operator to the CPU 111 via the interface 119.

The axis control circuit 130 for controlling each axis of the machine tool receives the axis movement command amount from the CPU 111 and outputs the axis command to the servo amplifier 140. In response to this command, the servo amplifier 140 drives the servomotor 150 that moves the shaft included in the machine tool. The shaft servomotor 150 has a built-in position / speed detector, feeds back the position / speed feedback signal from the position / speed detector to the shaft control circuit 130, and performs position / speed feedback control.

The spindle control circuit 160 receives a spindle rotation command to the spindle of the machine tool and outputs a spindle speed signal to the spindle amplifier 161. In response to this spindle speed signal, the spindle amplifier 161 rotates the spindle motor 162 of the spindle at the commanded rotation speed to drive the tool. A position coder 163 is coupled to the spindle motor 162, and the position coder 163 outputs a feedback pulse in synchronization with the rotation of the spindle, and the feedback pulse is read by the CPU 111.

In the present embodiment, a machine tool provided with a servomotor and a spindle motor is illustrated as a control target of the numerical control device, but other machine tools such as an electric discharge machine and a robot are also included.

FIG. 2 is a block diagram of a main part of the numerical control device 100 according to the embodiment of the present disclosure. The numerical control device 100 includes a start instruction detection unit 11 that detects an operation start instruction input from a user, a connector 12 that inserts a USB memory as a portable storage medium, and a USB data acquisition unit that reads data stored in the USB memory. 13, an error code creation unit 14 that creates an error detection code (or error correction code) corresponding to predetermined data, a copy creation unit 15 that creates a copy of the data read from the USB memory, and a copy creation unit 15 that reads from the USB memory. A storage unit 16 that stores a copy of the data and an error code of the data, an operation control unit 17 that controls the operation of the machine tool according to a program read from the USB memory, and a program error stored in the storage unit 16 are dealt with. The error handling processing unit 20 is provided. In the description of the present disclosure, the data will be described as a machine tool program, but the type of data is not limited to the program. Further, the type of the portable storage medium is not limited to USB, and other portable storage media such as a flash memory and an external hard disk may be used. When a portable storage medium other than the USB memory is used, a connector and a data acquisition unit corresponding to each portable storage medium are provided.

The start instruction detection unit 11 is an input unit, a user interface, or the like, and receives an instruction input from the user. When the user instructs the start of operation of the program stored in the USB memory, the start instruction detection unit 11 notifies the error handling processing unit 20 and the data acquisition unit (USB data acquisition unit 13).

The USB data acquisition unit 13 is a device driver or the like of the USB memory, and communicates with the USB memory main body. The USB data acquisition unit 13 communicates with the USB memory via the connector 12 and acquires the designated data. The target data is data related to machine tool control, such as machine tool programs and parameters related to machine tool operation and settings.

The error code creation unit 14 creates an error detection code or an error correction code for the data acquired by the USB data acquisition unit 13. Here, the error detection code is a code for detecting an error, and the error correction code is a code for detecting and correcting an error in data. The error detection code includes, but is not limited to, a block code, a parity code, a checksum, and a cyclic code. The error correction code includes, but is not limited to, a block code and a convolutional code.

The copy creation unit 15 creates a copy of the data acquired from the USB memory. The copy of the data created by the copy creation unit 15 and the error code created by the error code creation unit 14 are stored in the storage unit 16. The storage unit 16 is a safe memory and is not affected by disturbances such as factory vibration. The data stored in the storage unit 16 and the error code are safely held.

The operation control unit 17 reads the program stored in the storage unit 16 and controls the machine tool according to the read program. The numerical control device 100 shown in FIG. 1 is a machine tool including a servomotor and a spindle motor, but the machine tool to be controlled is not limited to this. For example, it also includes other machine tools such as electric discharge machines and robots.

The error handling processing unit 20 uses a stored data reading unit 21 for reading the data stored in the storage unit 16, a stored code reading unit 22 for reading the error code stored in the storage unit 16, and an error code for data. An error detection unit 23 for detecting the above and an error notification unit 24 for notifying the operation control unit 17 that an error has existed are provided.

The error handling processing unit 20 performs error detection of the data stored in the storage unit 16, and when an error is detected, performs processing corresponding to the error. The error handling processing unit 20 of the present embodiment notifies the operation control unit 17 of the existence of an error. The operation control unit 17 safely stops the machine tool. Ensure fail-safe by stopping safely.

Next, the operation of the numerical control device 100 of FIG. 2 will be described with reference to FIG. As a premise, in this example, the machine tool program stored in the USB memory as data is acquired.

First, the user inserts the USB memory in which the program is stored into the connector 12 of the numerical control device 100 (step S1).

When the user instructs the operation of the program stored in the USB memory (step S2), the USB data acquisition unit 13 acquires the specified program from the USB memory (step S3). The error code creation unit 14 creates an error code of the program acquired from the USB memory (step S4). The copy creation unit 15 creates a copy of the program read in step S3 and stores it in the storage unit 16 (step S5). Further, the error code created in step S4 is also stored in the storage unit 16 (step S6).

The stored data reading unit 21 reads the program designated by the user from the storage unit 16 (step S7). The stored code reading unit 22 reads the error code of the program specified by the user from the storage unit 16 (step S8). The error handling processing unit 20 uses the error code read in step S8 to detect an error in the program read in step S7 (step S9). If there is no error in the program (step S10; NO), the operation control unit 17 controls the operation of the machine tool according to the read program (step S11). When an error in the program is detected (step S10; YES), the error handling processing unit 20 notifies the operation control unit 17 of the existence of the error (step S12). Upon receiving the notification from the error handling processing unit 20, the operation control unit 17 safely stops the machine tool (step S13).

As described above, when the numerical control device 100 of FIG. 2 acquires data from the USB memory which is a portable storage medium, it creates an error code of the acquired data and is a safe storage area together with the acquired data. It is stored in the storage unit 16. When the machine tool is operated, the machine tool is controlled while detecting an error in the data stored in the storage unit 16. If there is an error in the data, the machine tool can be stopped safely and fail-safe can be ensured.

Next, the numerical control device 100a of another embodiment will be described. In the numerical control device 100a of FIG. 4, the error code creating unit 14 creates an error code before the start of operation of the machine tool. The storage unit 16 stores an error code created before the start of operation. The error handling processing unit 20a uses the error code stored in the storage unit 16 to detect an error in the data acquired from the USB memory. When an error is detected, the operation control unit 17 safely stops the machine tool. Since the numerical control device 100a of FIG. 4 does not store data in the storage unit 16, the copy creation unit 15 and the stored data reading unit 21 of FIG. 2 are not included. The numerical control device 100a directly processes the data acquired by the USB data acquisition unit 13 without storing it in the storage unit 16. The numerical control device 100a does not store the program in the storage unit 16. The numerical control device 100a can safely control the machine tool even when the free space of the storage unit 16 which is a safe storage area is smaller than the program capacity on the USB. In addition, the time required to copy the program can be reduced.

The operation of the numerical control device 100a shown in FIG. 4 will be described with reference to FIG. In this example as well, the program is acquired from the USB memory as in the case of FIG.

First, the user inserts the USB memory into the connector of the numerical control device 100a (step S21). When the insertion of the USB memory is detected, the USB data acquisition unit 13 acquires the program from the USB memory (step S22). The error code creation unit 14 creates an error code of the program acquired from the USB memory (step S23). The error code created in step S23 is stored in the storage unit 16 (step S24).

When the user instructs the operation of the program stored in the USB memory (step S25), the USB data acquisition unit 13 acquires the specified program from the USB memory (step S26).

The error handling processing unit 20 uses the error code stored in the storage unit in step S24 to detect an error in the program acquired from the USB memory in step S26 (step S27). If there is no error in the program (step S28; NO), the operation control unit 17 operates the machine tool according to the acquired program (step S29). When an error in the program is detected (step S28; YES), the error handling processing unit 20a notifies the operation control unit 17 of the existence of the error (step S30). The operation control unit 17 safely stops the machine tool upon receiving the notification from the error handling processing unit 20a (step S31).

Next, another embodiment will be described with reference to FIG. In the numerical control device 100b of FIG. 6, the error handling processing unit 20b includes a stored data reading unit 21 that reads the data stored in the storage unit 16 and a stored code reading unit 22 that reads the error code stored in the storage unit 16. , The error detection unit 23 that detects an error in the data using an error code, the retry unit 25 that instructs the USB data acquisition unit 13 to reload the corresponding part when an error exists, and the reloaded data. If there is no error, the restart processing unit 26 that instructs the operation control unit 17 to restart the operation, and the error notification unit 24 that notifies the operation control unit 17 of the existence of the error when there is an error in the reloaded data. Be prepared.

The error handling process of the numerical control device 100b shown in FIG. 6 will be described with reference to FIG. 7. As a premise of this processing, it is assumed that the program acquired from the USB memory and the error code of the program are stored in the storage unit.

First, the stored data reading unit 21 reads the designated program from the storage unit 16 (step S41), and the stored code reading unit 22 reads the error code (step S42). The error detection unit 23 uses the error code read in step S42 to detect an error in the program read in step S41 (step S43).

If there is no error in the program in step S43 (step S44; NO), the operation control unit 17 operates the machine tool according to the read program (step S45). When an error in the program is detected (step S44; YES), the retry unit 25 instructs the USB data acquisition unit 13 to reload the program (step S46). The error detection unit 23 detects an error in the program reloaded in step S46 (step S47). Here, if no error is detected (step S48; NO), the restart processing unit 26 instructs the operation control unit 17 to restart the operation (step S49). When an error is detected (step S48; YES), the error notification unit 24 notifies the operation control unit 17 of the existence of the error (step S50). Upon receiving the notification from the error handling processing unit 20b, the operation control unit 17 safely stops the machine tool (step S51).

As described above, according to the numerical control device 100b of FIG. 6, if there is an error in the program read from the USB memory, the program is reloaded, and if there is no error in this program, the operation of the machine tool is continued. .. If the reloaded program is correct, the machine tool can continue to operate without stopping. In the flowchart of FIG. 7, the number of reloads is set to 1, but the processes of steps S46 to S48 may be repeated a plurality of times. In addition, a time limit for reloading may be set. Further, the numerical control device 100b of FIG. 6 has a configuration in which both the error code and the program are stored in the storage unit 16 as in the numerical control device 100 of FIG. 2, but as in the numerical control device 100a of FIG. The configuration may be such that only the error code is stored in the storage unit 16.

Next, another embodiment will be described with reference to FIG. In the numerical control device 100c of FIG. 8, the error handling processing unit 20c includes a stored data reading unit 21 that reads the data stored in the storage unit 16 and a stored code reading unit 22 that reads the error code stored in the storage unit 16. , An error detection unit 23 that detects data errors using an error code, an error correction unit 27 that corrects an error when an error exists, and an operation control unit 17 that instructs the operation control unit 17 to restart the operation when the error is corrected. It includes a restart processing unit 26.

The error handling process of the numerical control device 100c shown in FIG. 8 will be described with reference to FIG. As a premise of this processing, it is assumed that the program acquired from the USB memory and the error code of the program are stored in the storage unit 16. Further, the error code in this process is not an error detection code that only performs error detection, but an error correction code that detects and corrects an error.

First, the stored data reading unit 21 reads the designated program from the storage unit 16 (step S61), and the stored code reading unit 22 reads the error code of the program from the storage unit 16 (step S62). The error detection unit 23 uses the error code read in step S62 to detect an error in the program read in step S61 (step S63).

If there is no error in the program in step S63 (step S64; NO), the operation control unit 17 operates the machine tool according to the read program (step S65). When an error in the program is detected (step S64; YES), the error correction unit 27 corrects the error in the program by using the error code read in step S62 (step S66). Next, the operation control unit 17 proceeds to step S65 and operates the machine tool according to the program corrected in step S66. The numerical control device 100c repeats the processes of S63 to S66 until all the processes described in the program are completed.

Finally, another configuration of the numerical control device 100d will be described with reference to FIG. The numerical control device 100d of FIG. 10 acquires the data of the portable storage medium via the USB input / output device 40. The USB input / output device 40 is connected to the numerical control device 100d. The USB input / output device 40 includes a USB connector 41 and can insert a USB memory. The external device data acquisition unit 28 reads the data stored in the USB memory via the USB input / output device 40. As in the other embodiments, the USB input / output device 40 can read data from a portable storage medium other than the USB memory, such as an external hard disk.

As described above, when using the data stored in the portable storage medium, the numerical control device of the present embodiment creates an error detection code of the data before the operation of the machine, and is safe in the numerical control device. By storing the data in the memory, it is possible to detect in advance data corruption or loss that may occur in a factory or the like, and use the data safely.

In the present embodiment, the data related to the control of the machine tool has been described as a program of the machine tool, but the data related to the control of the machine tool is not limited to this, and includes, for example, parameters and setting information.

100, 100a to 100d Numerical control device 11 Start instruction detection unit 12 Connector 13 USB data acquisition unit 14 Error code creation unit 15 Copy creation unit 16 Storage unit 17 Operation control unit 20, 20a to 20d Error handling processing unit 21 Read stored data Unit 22 Stored code reading unit 23 Error detection unit 24 Error notification unit 25 Retry unit 26 Resume processing unit 27 Error correction unit 28 External device data acquisition unit

Claims (10)

A numerical control device that controls industrial machinery
A data acquisition unit that acquires data related to the control of the industrial machine, and
A code creation unit that creates an error code including at least one of an error detection code and an error correction code for the data related to the control of the industrial machine.
A storage unit that stores the error code and
An error detection unit that detects errors in the data using the error code, and
When the error detection unit detects an error in the data, an error handling processing unit that performs a process for dealing with the error and an error handling processing unit.
Numerical control device. The numerical control device according to claim 1, wherein the error handling processing unit switches control of the industrial machine. Equipped with a connector to join with a portable storage medium
The numerical control device according to claim 1, wherein the data acquisition unit acquires data stored in the portable storage medium via the connector. The numerical control device according to claim 1, wherein the data relating to the control of the industrial machine is a program of the industrial machine. The numerical control device according to claim 1, wherein both the error code and the data are stored in the storage unit. The numerical control device according to claim 1, wherein when the error detection unit detects an error in the data, the error handling processing unit safely stops the industrial machine. The numerical control device according to claim 3, wherein when the error detection unit detects an error in the data, the error handling processing unit switches to control for reading the data stored in the portable storage medium again. The numerical control device according to claim 1, further comprising an error correction unit that corrects data errors using the error correction code, and the error handling processing unit switches to control that waits for error correction. The data acquisition unit is requested to acquire data from a connector to be joined to the portable storage medium and a data input / output device that reads the data stored in the portable storage medium and transfers the read data to the numerical control device. Item 1. The numerical control device according to Item 1. A control system that controls industrial machinery
A data acquisition unit that acquires data related to the control of the industrial machine, and
A code creation unit that creates an error code including at least one of an error detection code and an error correction code for the data related to the control of the industrial machine.
A storage unit that stores the error code and
A detection unit that detects an error in the data using the error code,
When the error detection unit detects an error, the error handling processing unit that performs processing to deal with the error and the error handling processing unit
Numerical control system with.

Images