JP2003075472A - Servo information waveform displaying method and display using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a servo information waveform displaying method and a display using the same which simply and quickly compares two servo information waveforms, without using another apparatus. SOLUTION: The waveform display 20 selects waveform displaying current data Cur, etc., (S103, S107, S109) to be displayed as a waveform, stores the data on a comparison data memory area 23a (S105, S111) to display the data as a waveform on a display (S113) on one hand, selects past data Mm to be displayed as a superposed waveform (S117, S119), stores the data on a reference data memory area 23b (S121) and displays the data as a waveform superposed on the waveform of the current data Cur, etc., on the display (S123), thus displaying the waveform of the past data Mm waveform superposed on the waveform of the current data Cur, etc., within the same display frame, without using other apparatus. This makes possible comparing two servo information waveforms simply and quickly, without using another apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo information waveform display method for displaying servo information as a waveform on a screen based on servo information fetched from a controller for controlling a servo motor, and a display using the same. It relates to the device.

[0002]

2. Description of the Related Art Generally, servo information fetched from a controller for controlling a servo motor is an extremely useful information source for knowing the operating state of a servo system to be controlled. Therefore, by grasping the servo information over a predetermined period as a waveform based on the servo information and comparing it with the waveform collected at the normal time, it is possible to determine from a visual point of view whether or not the operating state of the servo system is normal. It is possible to guess the cause of the abnormality.

Therefore, conventionally, as a method of comparing waveforms based on servo information (hereinafter referred to as "servo information waveforms") fetched from a control device for controlling servo motors, each servo information waveform is printed out on paper. A method of viewing side by side or a method of displaying servo information waveforms side by side in a plurality of windows in a system having a multi-window function has been generally adopted. As for the servo information that has been made into a file, a typical method is to read the servo information into spreadsheet software, etc., and then simultaneously display a plurality of servo information waveforms with the spreadsheet software. Was said.

[0004]

However, according to each of the conventional methods described above, when an abnormality occurs in the servo system to be controlled, the difference between the servo information waveform at the time of abnormality and the servo information waveform at the time of normality However, since it is separately displayed in a separate display frame, it is necessary to display one waveform on the screen, print out, etc., and then compare it with the other waveform. In other words, it is not possible to display both waveforms in the same display frame in an overlapping manner, so there is the problem that another device is required to print out on paper or display with other spreadsheet software. There is also a problem that it takes time to output.

Further, since both waveforms are arranged side by side in the form of being displayed in separate display frames for comparison, it is easy to overlook detailed differences on the waveforms that are easy to find by displaying both waveforms in the same display frame in an overlapping manner. There is also a problem. This problem may be solved by printing out the two waveforms separately, superimposing the two sheets of paper, and seeing through and comparing the two waveforms, but this is time-consuming and simple and quick. It hinders judgment.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a servo which can easily and quickly compare two servo information waveforms without using any other device. An object of the present invention is to provide an information waveform display method and a display device using the same.

[0007]

[Means for Solving the Problems and Actions and Effects of the Invention]
In order to achieve the above object, in the method for displaying a servo information waveform according to claim 1, a servo information waveform for displaying the servo information as a waveform on a screen based on the servo information fetched from a control device that controls the servo motor. A display method, a first step of selecting first servo information for which waveform display is desired, and a second step of storing the first servo information selected in the first step in a first data area, A third step of displaying the first servo information stored in the first data area by the second step as a waveform on a screen, and a waveform of the first servo information displayed on the screen by the third step. And a second step of selecting the second servo information desired to be displayed in a waveform, and the second servo information selected in the fourth step in the second data area. And a sixth step of displaying the second servo information stored in the fifth step as a waveform and superimposing it on the waveform of the first servo information on the screen. And

According to the invention of claim 1, the first servo information desired to be displayed in the waveform is selected in the first step, and the second servo information is selected.
The first servo information selected by the first step is stored in the first data area by the step, and the first servo information stored in the first data area by the second step is displayed as a waveform on the screen. , The second servo information desired to be displayed on the waveform is superimposed on the waveform of the first servo information displayed on the screen in the third step in the fourth step, and the second servo information selected in the fourth step is selected in the fifth step. Is stored in the second data area, and the second servo information stored in the fifth step by the sixth step is displayed as a waveform on the screen so as to be superimposed on the waveform of the first servo information. That is, the first to display the waveform
Servo information is selected (first step), stored in the first data area (second step), and displayed as a waveform on the screen (third step), while the second servo desired to be superimposed and displayed as a waveform The information is selected (fourth step), stored in the second data area (fifth step), and displayed on the screen in superposition with the waveform of the first servo information (sixth step). Accordingly, the waveform of the second servo information can be displayed on the screen by superimposing it on the waveform of the first servo information without using another device, that is, both waveforms can be displayed on the screen by superimposing them in the same display frame. . Therefore, there is an effect that the two servo information waveforms can be compared easily and quickly without using another device.

According to a second aspect of the present invention, in the servo information waveform display method according to the first aspect, the waveform displayed in the third step is overlapped between the third step and the fourth step. The fourth step, the fifth step, and the sixth step are executed only when there is a display method selection step of selecting whether or not to display, and there is a selection to perform an overlapping display from this display method selection step. The technical feature is to execute.

In the invention of claim 2, the third step and the fourth step
If a display method selection step for selecting whether or not to perform superimposed display on the waveform displayed in the third step is interposed between the step and the step, and there is a selection to perform the superimposed display from this display method selection step. Only in the fourth step,
The fifth step and the sixth step are executed. That is, the first servo information to be displayed as a waveform is selected (first step), stored in the first data area (second step), and displayed as a waveform on the screen (third step), and by the third step. Select whether or not to display overlaid on the displayed waveform (display method selection step), and only when overlaid display is selected, select the second servo information to be overlaid and displayed in waveform (first 4 steps), it is stored in the second data area (fifth step), and it is displayed on the screen by superimposing it on the waveform of the first servo information (sixth step). As a result, if there is a selection not to display the waveform on the waveform displayed in the third step, the fourth step and the fifth step are performed.
Since the step and the sixth step are not executed, unnecessary selection operation and screen display are prevented, and the second step
It is possible to prevent wasteful use of the data area. Therefore, there is an effect that the two servo information waveforms can be efficiently and simply compared with each other as needed.

Further, in the method for displaying the servo information waveform according to claim 3, in claim 1 or 2, the waveform of the first servo information displayed on the screen in the third step or the screen displayed in the sixth step. At least one of the waveforms of the second servo information is technically characterized in that it is movable in the time axis direction on the display screen.

According to the invention of claim 3, at least one of the waveform of the first servo information displayed on the screen in the third step and the waveform of the second servo information displayed on the screen in the sixth step is a display screen. It is movable in the time axis direction above. That is, at least one of the two waveforms displayed on the screen in a superimposed manner can be moved in time position on the display screen. As a result, when the waveform of the second servo information is superimposed on the waveform of the first servo information and displayed on the screen in the sixth step, even if the time position of one waveform deviates from the time position of the other waveform. By moving either one of the waveforms in the time axis direction, the time positions of both waveforms can be arbitrarily matched. Therefore, even when the time position of one waveform is deviated from the time position of the other waveform, there is an effect that two servo information waveforms can be compared easily and quickly without using another device. is there.

In order to achieve the above object, in the servo information waveform display device according to the present invention, the servo information waveform is displayed on the screen based on the servo information fetched from the control device for controlling the servo motor. An information waveform display device, comprising: first servo information selecting means for selecting first servo information for which waveform display is desired; and first servo information selected by the first servo information selecting means as first data. First servo information storage means for storing in the area, first servo waveform display means for displaying the first servo information stored in the first data area by the first servo information storage means as a waveform on the screen, Second servo information for selecting second servo information desired to be displayed in a waveform by superimposing the waveform of the first servo information displayed on the screen by the first servo waveform display means. Selecting means, second servo information storing means for storing the second servo information selected by the second servo information selecting means in a second data area, and the second servo information storing means for storing the second servo information Second servo waveform display means for displaying the servo information of (1) as a waveform on the screen so as to be superimposed on the waveform of the first servo information.

According to another aspect of the present invention, the first servo information selecting means selects the first servo information desired to be displayed, and the first servo information storing means selects the first servo information by the first servo information selecting means. Servo information of the first servo area is stored in the first data area, and the first servo waveform display means
The first servo information stored in the first data area by the servo information storage means is displayed as a waveform on the screen. On the other hand, the second servo information selecting means selects the second servo information desired to be displayed in a waveform by superimposing it on the waveform of the first servo information displayed on the screen by the first servo waveform displaying means,
The second servo information storage means stores the second servo information selected by the second servo information selection means in the second data area, and the second servo waveform display means stores the second servo information by the second servo information storage means. Is displayed on the screen as a waveform by superimposing it on the waveform of the first servo information.
That is, the first servo information to be displayed as a waveform is selected (first
(Servo information selecting means), storing it in the first data area (first servo information storing means) and displaying it as a waveform on the screen (first servo waveform display means), while the second servo which is desired to be superimposed and displayed as a waveform Information is selected (second servo information selection means), stored in the second data area (second servo information storage means), and displayed on the screen in superposition with the waveform of the first servo information (second servo waveform). Display means). Accordingly, the waveform of the second servo information can be displayed on the screen by superimposing it on the waveform of the first servo information without using another device, that is, both waveforms can be displayed on the screen by superimposing them in the same display frame. . Therefore, there is an effect that the two servo information waveforms can be compared easily and quickly without using another device.

According to a fifth aspect of the present invention, in the servo information waveform display method according to the fourth aspect, the servo information waveform display device performs an overlay display on the waveform displayed by the first servo waveform display means. It has a display method selection means for selecting whether or not the second servo information is selected by the second servo information selection means only when the display method selection means performs the overlapping display. Second
A technical feature is that the second servo information is stored by the servo information storage means and the waveform of the second servo information is displayed by the second servo waveform display means in a superimposed manner.

According to a fifth aspect of the present invention, the servo information waveform display device has a display method selection means for selecting whether or not to perform superimposition display on the waveform displayed by the first servo waveform display means. Only when the display method selecting means selects the overlapping display, the second servo information selecting means selects the second servo information, the second servo information storing means stores the second servo information, and the second servo. The waveform display means displays the waveform of the second servo information in a superimposed manner.
That is, the first servo information to be displayed as a waveform is selected (first
Servo information selecting means), storing it in the first data area (first servo information storing means), displaying it as a waveform on the screen (first servo waveform display means), and displaying the waveform by the first servo waveform display means. It is selected whether or not to overlay display on the display (display method selection means), and only when the overlay display is selected, the second servo information to be overlaid on the waveform is selected (second servo information selection). Means) and store it in the second data area (second servo information storage means), and store it in the first data area.
Is displayed on the screen so as to be superimposed on the servo information waveform (2nd servo waveform display means). As a result, when there is a selection not to be overlaid on the waveform displayed by the display method selection means, the second servo information selection means selects the second servo information, and the second servo information storage means selects the second servo information. Since the second servo information is not stored and the second servo waveform display means does not display the second servo information waveform overlaid, unnecessary selection operation and screen display are prevented and waste of the second data area is prevented. be able to. Therefore, there is an effect that the two servo information waveforms can be efficiently and simply compared with each other as needed.

Further, in the method of displaying the servo information waveform according to claim 6, in claim 4 or 5, the waveform of the first servo information displayed on the screen by the first servo waveform display means or the second servo waveform display. At least one of the waveforms of the second servo information displayed on the screen by the means is technically characterized by being movable in the time axis direction on the display screen.

According to the invention of claim 6, of the waveform of the first servo information displayed on the screen by the first servo waveform display means or the waveform of the second servo information displayed on the screen by the second servo waveform display means. At least one of them is movable in the time axis direction on the display screen. That is, at least one of the two waveforms displayed on the screen in a superimposed manner can be moved in time position on the display screen. This allows
As a result of displaying the waveform of the second servo information on the screen by superimposing the waveform of the second servo information on the screen by the second servo waveform display means,
Even if the time position of one waveform is deviated from the time position of the other waveform, the time positions of both waveforms can be arbitrarily matched by moving one of the waveforms in the time axis direction. Therefore, even when the time position of one waveform is deviated from the time position of the other waveform, there is an effect that two servo information waveforms can be compared easily and quickly without using another device. is there.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a servo information waveform display method of the present invention and a display device using the same will be described below with reference to the drawings. First, the configuration of a servo information waveform display device (hereinafter referred to as "waveform display device") using the servo information waveform display method of the present invention will be described with reference to FIG.

As shown in FIG. 1, the waveform display device 20 according to the present embodiment plays a role as an operation panel for the PLC 30 and the NC 40, while the numerical control device (hereinafter referred to as “NC”) 40 is used. It has a function of displaying on the screen waveforms and numerical values based on various stored data (for example, current value, position deviation value, speed deviation value, etc.). Therefore, the waveform display device 20 mainly includes the CPU 21 and the ROM 2
2, a RAM 23, a flash memory 24, an input / output interface 25, a keyboard 26, a display 27, a communication interface 28, etc., and a programmable logic controller (hereinafter referred to as "PLC").
It is connected to the NC 40 via 30.

The NC 40 is connected to a machine tool equipped with a servomotor which is an object of numerical control. For example, in the case of the present embodiment, a spindle control circuit 51, a spindle servo amplifier 52, a spindle servo motor 53
A single-spindle rotation system, and a spindle feed control circuit 61,
A control target is a cutting machine including a spindle feed system including a spindle feed servo amplifier 62 and a spindle feed servo motor 63.

The CPU 21 is a central processing unit for controlling the waveform display device 20, and is a ROM 2 via a system bus.
2, RAM 23, flash memory 24, input / output interface 25, etc. A system program for controlling the CPU 21, a predetermined control program, and the like are stored in the ROM 22, and the CPU 21 reads these programs from the ROM 22 and expands them in the work area 23c of the RAM 23 or the like. This gives, for example,
The waveform display program for performing the later-described waveform display processing (FIG. 2) can be sequentially executed by the CPU 21.

The ROM 22 is a read-only storage device connected to the system bus and constitutes a part of the main storage space used by the CPU 21. This ROM
Since the system program, the waveform display program, and the like are previously written in the CPU 22, the CPU 21 uses the ROM 2
Predetermined processing can be executed by reading the system program or the like written in 2 via the system bus.

The RAM 23 also constitutes a part of the main storage space used by the CPU 21, and is a readable / writable volatile storage device connected to the system bus.
For example, a DRAM (Dynamic RAM) is used, and a plurality of areas such as a comparison data storage area 23a, a reference data storage area 23b, and a work area 23c described below are defined and secured in the storage space.

The comparison data storage area 23a secured in the RAM 23 is an area for storing servo information (hereinafter referred to as "comparison data") to be compared and displayed, and is, for example, N.
Current servo information obtained from C40 (hereinafter "current data")
Or the past servo information (hereinafter referred to as “past data”) already obtained from the NC 40.
This is a storage space for storing the past data when selected from.

Similarly, the reference data storage area 23b is displayed on the screen in comparison with the comparison data stored in the comparison data storage area 23a and serves as reference display servo information (hereinafter referred to as "reference data"). Is an area for storing. In this area, for example, servo information at a normal time (hereinafter referred to as “normal time data”) collected at the time of shipping the machine tool and the above-mentioned past data are stored.

Similarly, the work area 23c is a work area used when executing a system program and a waveform display process described later, and is a storage space for temporarily storing work data, intermediate files and the like. is there.

The flash memory 24 constitutes a secondary storage space used by the CPU 21, is connected to the system bus, and can electrically erase all the contents EEPRO.
It is M. The flash memory 24 has a larger storage space than the RAM 23 (eg, 64 Mbytes, 128
Since it has Mbytes), it is possible to store a plurality of files obtained by collecting a plurality of the above-mentioned past data into a file.

For example, past data * 1 to * n (* is a number from 1 to N) is stored in the flash memory 24 according to the present embodiment.
A file in which n items of the above are combined into one file (N files 1 to N are stored (see FIG. 1). The past data stored in these files 1 to N is displayed as necessary on the screen. Are read out and stored in the comparison data storage area 23a and the reference data storage area 23b of the RAM 23 described above.

The input / output interface 25 is a device that mediates the exchange of data between the CPU 21, etc. and the input / output device such as the keyboard 26, the display 27, the communication interface 28, etc., and is connected to the system bus.

The keyboard 26 is an input device capable of inputting operation information as an operation panel of the PLC 30 and selection information for selecting current data or past data by a waveform display process which will be described later, and via the input / output interface 25. It is connected to the system bus. In general, a configuration in which a predetermined number of push-type switches are arranged is adopted, but there is also a touch-panel type switch provided on the surface of the display 27 in consideration of simplification of input operation.

The display 27 is a display device capable of outputting operation information as an operation panel of the PLC 30 and waveforms of comparison data and reference data by a waveform display process described later.
It is connected to the system bus via the input / output interface 25. For example, there is one that is configured by a CRT or a liquid crystal display and has a touch panel that configures the keyboard 26 on the display surface.

The communication interface 28 is a device that mediates data communication between the PLC 30 and the CPU 21, and is connected to the system bus via the input / output interface 25. For example, a configuration is possible in which data communication is possible by serial data transmission by RS-232C as the physical layer and BSC procedure as the data link layer. This gives C
Transmission of control data from the PU 21 to the PLC 30 and PL
Various data from C30 to CPU21 (for example, current value,
It is possible to receive position deviation values, speed deviation values, etc.).

The PLC 30 includes the waveform display device 20 and NC4.
0 and is mainly interposed between the CPU and R, not shown.
It is composed of an OM, a RAM, an input / output control circuit, and the like. In the present embodiment, the PLC 30 plays a role as a higher-level control device of the NC 40, issues an instruction to the NC 40, and collects data from the NC 40.

The NC 40 is connected to the PLC 30 as a lower device of the PLC 30, and is mainly connected to a CP (not shown).
It is composed of a U, a ROM, a RAM, an input / output control circuit, and the like. A spindle control circuit 51 and a spindle feed control circuit 61 are connected to the input / output control circuit. As a result, based on the control data transmitted from the PLC 30, a predetermined command signal for driving each actuator of the machine tool (spindle servo motor 53 or spindle feed servo motor 63) is generated, and the command signal is generated. Can be sent to the spindle control circuit 51 and the spindle feed control circuit 61. Further, it is possible to collect current information, position information, speed information, deviation information, current command value, torque information, etc. detected by a sensor (not shown) and send them to the PLC 30 as necessary.

For example, the start command from PLC 30 is NC4.
When it is output to 0, the drive command by the servo system assembled in the NC 40 is output from the NC 40 to, for example, the spindle control circuit 51. A speed loop and a current loop are formed in the spindle control circuit 51, and a pulse width modulation (hereinafter referred to as “PWM”) signal is output to the spindle servo amplifier 52. Servo amplifier for spindle 52
Drives the spindle servomotor 53 by this PWM signal. At this time, various data (for example, current value, position deviation value, speed deviation value, etc.) are stored in the NC 40.

As a result, as described above, the waveform display device 20
By configuring the various data (for example, current value, position deviation value, speed deviation value, etc.) stored in the NC 40,
It can be stored in the flash memory 24 of the waveform display device 20 via the PLC 30 or temporarily stored in the RAM 23, and waveforms and numerical values based on the various data can be displayed on the display 27.

That is, the latest data (current data) is read out by the waveform display processing (FIG. 2) described later (FIG. 2).
If S103) is executed, the RAM 23 is updated with the latest data every predetermined sampling period (for example, 5 mS).
Can be written in the comparison data storage area 23a and displayed as a waveform on the display 27. Also,
When the process of reading the past data (S107 shown in FIG. 2) is executed by the waveform display process, the past data stored in the files 1 to N of the flash memory 24 is stored as the reference data in the RAM 23 at the sampling cycle. It is possible to write to the area 23b and display it as a waveform on the display 27.

Next, the waveform display device 20 according to the present embodiment.
2 will be described with reference to FIGS. Since the waveform display device 20 is controlled by the waveform display program stored in the ROM 22 described above, the waveform display processing by the program will be described below.

As shown in FIG. 2, in the waveform display process, after a predetermined initialization process, first, in step S101, a determination process of whether or not to read the current data Cur is performed. This processing is performed based on the input instruction from the keyboard 26, and the servo information waveform displayed on the display 27 as the comparison data is based on the current data Cur (Ye.
s) or one based on past data (No).

When it is determined by the input instruction from the keyboard 26 that the current data Cur is read in step S101 (Yes in S101), the process proceeds to step S103 to select the current data Cur from the NC 40, and then the step The current data Cur selected by S105
Is written in the comparison data storage area 23a of the RAM 23. Then, the process proceeds to step S113.

On the other hand, when it is determined by the input instruction from the keyboard 26 that the current data Cur is not read out in step S101 (No in S101), that is, when past data is read out, the process proceeds to step S107. File stored in flash memory 24
Process of selecting a desired file K (K is a number from 1 to N) from N to N, and further selecting the corresponding past data Kk (k is a number from 1 to n) from the selected file K in step S109. I do. Then, step S11
1, the selected past data Kk is written in the comparison data storage area 23a of the RAM 23, and step S11
The processing shifts to 3.

In step S113, a process of displaying a waveform based on the comparison data written in the comparison data storage area 23a on the display 27 is performed. Specifically, as shown in FIG. 3A, for example, based on the comparison data read from the comparison data storage area 23a of the RAM 23, the vertical axis (Y axis) indicates the level (current value, voltage value, etc.) Axis (X axis)
The waveform generated by plotting on the XY plane in which the respective times are set is displayed.

Next, in step S115, it is determined whether or not the waveform based on the reference data is superimposed on the waveform based on the comparison data displayed in the previous step S113. This determination process is also performed based on the input instruction from the keyboard 26, similarly to step S101 described above, and the servo information waveform based on the reference data is displayed by being superimposed on the waveform of the comparison data already displayed on the display 27. Either (Yes) or not (No) is selected.

When it is determined by the input instruction from the keyboard 26 that the overlapping display is performed in step S115 (Yes in step S115), the process proceeds to step S117, and the files 1 to N stored in the flash memory 24 are stored.
A desired file M (M is a number from 1 to N) is selected from the above, and further, in step S119, a process of selecting the corresponding past data Mm (m is a number from 1 to n) from the selected file M is performed. . Then, step S121
Thus, the selected past data Mm is written in the reference data storage area 23b of the RAM 23, and step S123
Process is transferred to.

In step S123, a process of displaying a waveform based on the reference data written in the reference data storage area 23b on the display 27 is performed. Specifically, as in step S113, for example, as shown in FIG.
Based on the reference data read from the reference data storage area 23b of the AM 23, the level (current value,
Voltage value, etc.), X with time set on the horizontal axis (X axis)
The waveform generated by plotting on the Y plane is
As shown in FIG. 3 (C), the waveform of the comparison data already displayed on the display 27 (the waveform shown by the solid line in the figure) is displayed in the same display frame (displayed by the broken line in the figure). Waveform). Then, the process proceeds to step S125.

In the present embodiment, as shown in FIG. 3C, the waveform of the comparison data is shown by the solid line and the waveform of the reference data is shown by the broken line. If the waveforms can be distinguished from each other, for example, the former waveform may be displayed in blue and the latter waveform may be displayed in different waveform colors such as red.

On the other hand, when it is determined by the input instruction from the keyboard 26 that the superimposed display is not performed in step S115 (No in S115), the process proceeds to step S125 without performing the superimposed display.

In step S125, step S103
Then, a determination process as to whether to save the current data Cur selected from the NC 40 is performed. That is, since the current data Cur in step S103 is not yet stored in the flash memory 24, a process of selecting whether to save (store) it in the flash memory 24 (Yes) or not (No) is performed. Then, this processing is also performed in steps S101 and S1.
Similar to 15, it is performed based on an input instruction from the keyboard 26.

When it is determined by the input instruction from the keyboard 26 that the current data Cur is to be saved in step S125 (Yes in S125), the current data Cur is written in the flash memory 24 in step S127, and the above-described series of operations is performed. The waveform display process of is ended. On the other hand, if it is determined in step S125 that the current data Cur is not to be saved by the same input instruction (S1
No. 25), the current data Cur is stored in the flash memory 24
A series of waveform display processing is terminated without writing to the.

As shown in FIG. 4, in the waveform display device 20 of this embodiment, the waveform of the current data Cur or the past data Kk displayed on the display 27 (FIG. 4 (A)).
, And the waveform of the past data Mm displayed on the same waveform (FIG. 4 (B)) are the trigger points α at the time of data collection,
When they are deviated in the time axis direction due to the difference of β, etc.,
It also has a function of moving at least one of the two waveforms in the time axis direction on the display screen of the display 27. For example, by setting the display start position by the reference data display processing in step S123 described above to a position advanced from the trigger point α, both waveforms can be matched as shown in FIG. 4 (C).

As described above, according to the waveform display device 20 of this embodiment, steps S103 and S10 are performed.
7, the current data Cur or past data Kk (first servo information) desired to be displayed in waveform is selected by S109 (first step, first servo information selection means), and the selected current data Cur or past data Kk is selected. The comparison data storage area 2 of the RAM 23 by steps S105 and S111 (second step, first servo information storage means).
3a (first data area), and the stored current data Cur or past data Kk is stored in step S113.
A waveform is displayed on the display 27 by the (third step, first servo waveform display means). On the other hand, in steps S117 and S119 (fourth step, second servo information selection means), the past data Mm (which is desired to be displayed by superimposing it on the waveform of the present data Cur or past data Kk displayed on the display 27 is displayed. Second servo information), and the selected past data Mm is stored in the reference data storage area 23b of the RAM 23 in step S121 (fifth step, second servo information storage means).
In the (second data area), the stored past data Mm is superimposed on the waveform of the current data Cur or the past data Kk as a waveform in step S123 (sixth step, second servo waveform display means) and is displayed on the display 27. indicate.

That is, the current data Cur or the past data Kk to be displayed as a waveform is selected (S103, S107, S1).
09), the data is stored in the comparison data storage area 23a of the RAM 23 (S105, S111) and displayed as a waveform on the display 27 (S113), while the past data Mm to be displayed in a superimposed waveform is selected (S117, S11).
9), the data is stored in the reference data storage area 23b of the RAM 23 (S121), and is superimposed on the waveform of the current data Cur or the past data Kk and displayed on the display 27 (S121).
123). As a result, the waveform of the past data Mm can be overlaid on the waveform of the current data Cur or the past data Kk and displayed on the display 27 in the same display frame without using another device. Therefore, there is an effect that the two servo information waveforms can be compared easily and quickly without using another device. Further, by displaying both waveforms in the same display frame in an overlapping manner, it is possible to easily find a detailed difference in waveform.

Further, the waveform display device 20 according to the present embodiment.
According to the above, between step S113 (third step, first servo waveform display means) and steps S117, S119 (fourth step, second servo information selection means), the displayed waveform is overlaid and displayed. Step S115 (display method selection step, display method selection means) for selecting whether or not to perform is performed, and only when there is a selection to perform overlapping display from this step S115 (Yes in S115).
s), steps S117, S119 (fourth step, second servo information selection means), step S121 (fifth step, second servo information storage means) and step S12.
3 (sixth step, second servo waveform display means) is executed.

That is, the current data Cur or the past data Kk to be displayed in waveform is selected (S103, S107, S1).
09), store it in the comparison data storage area 23a of the RAM 23 (S105, S111), display it as a waveform on the display 27 (S113), and select whether or not to perform superimposed display on the displayed waveform. (S115), only when there is a selection to perform overlapping display (Y in S115
es), the past data Mm which is desired to be displayed as a waveform is selected (S117 and 119) and stored in the reference data storage area 23b of the RAM 23 (S121), and the current data C
Display 2 overlaid on the waveform of ur or past data Kk
No. 7 is displayed (S123). As a result, step S1
If there is a selection not to display the waveform on the waveform displayed by 13 (third step, first servo waveform display means) (No in step S115), step S11.
7, S119 (fourth step, second servo information selection means), step S121 (fifth step, second servo information storage means) and step S123 (sixth step,
Since the second servo waveform display means) is not executed,
Unnecessary selection operation by keyboard 26 and display 2
It is possible to prevent unnecessary display by 7 and waste of the reference data storage area 23b of the RAM 23. Therefore, there is an effect that the two servo information waveforms can be efficiently and simply compared with each other as needed.

Further, the waveform display device 2 according to the present embodiment
According to 0, the waveform of the current data Cur or the past data Kk displayed on the display 27 in step S113 (third step, first servo waveform display means), or step S123 (sixth step, second servo waveform display means). At least one of the waveforms of the past data Mm displayed on the display 27 by
It is possible to move in the time axis direction on the display screen of No. 7.
That is, at least one of the two waveforms displayed on the screen in a superimposed manner can be moved in time position on the display screen.
As a result, in step S123 (sixth step, second servo waveform display means), the waveform of the past data Mm is displayed on the screen so as to be superimposed on the waveform of the current data Cur or the past data Kk. As a result, the time position of one waveform is the other. Even if the time positions of the waveforms are deviated, the time positions of the two waveforms can be arbitrarily matched by moving either one of the waveforms in the time axis direction. Therefore, even when the time position of one waveform is deviated from the time position of the other waveform, there is an effect that two servo information waveforms can be compared easily and quickly without using another device. is there.

The above-described waveform display device 20 according to the present embodiment employs a method and a configuration for displaying both waveforms at the same time for comparison, but the difference between both waveform data is displayed and the difference data is Fourier transformed. Then, a method and a configuration may be adopted in which the threshold value is compared with a preset threshold value for each frequency component and an alarm is given when the threshold value is exceeded. In addition to servo information, I / O such as in-position signals
A method and a configuration for capturing the O signal and comparing them may be adopted.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a waveform display device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of waveform display processing by the waveform display device of the present embodiment.

FIG. 3 is an explanatory view showing an example of a waveform displayed by the waveform display device of the present embodiment, FIG. 3 (A) is an example of a reference waveform, and FIG.
Is an example of a comparative waveform, and FIG. 3C is an example of a waveform in which the reference waveform of FIG. 3A and the comparative waveform of FIG.

FIG. 4 is an explanatory diagram showing an example of a waveform displayed by the waveform display device of the present embodiment, FIG. 4 (A) is an example of a reference waveform, and FIG.
Is an example of a comparative waveform, and Fig. 4 (C) is the time base shifted Fig. 4 (B).
4A is an example of a waveform in which the comparative waveform of is displayed by being superimposed on the reference waveform of FIG.

[Explanation of symbols]

20 waveform display device (servo information waveform display device) 21 CPU 22 ROM 23 RAM 23a comparative data storage area (first data area) 23b reference data storage area (second data area) 24 flash memory 27 display (first servo waveform) Display means, second
Servo waveform display means) 30 PLC 40 NC (control device) 53 Spindle servo motor (servo motor) 63 Spindle feed servo motor (servo motor) Cur Current data (first servo information) Kk Past data (first servo) Information) Mm past data (second servo information) S103, S107, S109 (first step, first servo information selection means) S105, S111 (second step, first servo information storage means) S113 (third step, First servo waveform display means) S117, S119 (fourth step, second servo information selection means) S115 (display method selection step, display method selection means) S121 (fifth step, second servo information storage means) S123 (fifth step 6 steps, second servo waveform display means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshio Takano             1-1 Asahi-cho, Kariya city, Aichi             Machine Co., Ltd. F term (reference) 5H550 BB08 BB09 JJ17 KK06 MM01

Claims (6)

[Claims] 1. A method for displaying a servo information waveform, which displays the servo information as a waveform on a screen based on the servo information fetched from a control device for controlling a servo motor, wherein a first waveform display is desired. A first step of selecting servo information; a second step of storing the first servo information selected by the first step in a first data area; and a second step of storing the first servo information by the second step in the first data area A third for displaying the first servo information as a waveform on the screen;
A step, a fourth step of selecting second servo information whose waveform display is desired to be superimposed on the waveform of the first servo information displayed on the screen in the third step, and a fourth step selected by the fourth step A fifth step of storing the second servo information in the second data area, and a second step of displaying the second servo information stored in the fifth step as a waveform and superimposing it on the waveform of the first servo information. A method of displaying a servo information waveform, comprising: 6 steps. 2. A display method selection step for selecting whether or not to perform overlay display on the waveform displayed in the third step is interposed between the third step and the fourth step, The servo information waveform display according to claim 1, wherein the fourth step, the fifth step and the sixth step are executed only when the display method selecting step is performed to perform the overlapping display. Method. 3. At least one of the waveform of the first servo information displayed on the screen in the third step and the waveform of the second servo information displayed on the screen in the sixth step is a time on the display screen. The method for displaying a servo information waveform according to claim 1 or 2, wherein the method is capable of moving in the axial direction. 4. A servo information waveform display device for displaying the servo information as a waveform on a screen based on servo information fetched from a control device for controlling a servo motor, wherein the first waveform display is desired. First servo information selecting means for selecting servo information, first servo information storing means for storing the first servo information selected by the first servo information selecting means in a first data area, and the first servo information First servo waveform display means for screen-displaying the first servo information stored in the first data area by the storage means as a waveform; and the first servo information screen-displayed by the first servo waveform display means. Second servo information selecting means for selecting the second servo information desired to be displayed in a waveform superimposed on the waveform of No. 2, and the second servo information selecting means for selecting the second servo information. A second servo information storing means for storing servo information in the second data area, the second stored by said second servo information storage unit
Second servo waveform display means for displaying on the screen the servo information of 1. as a waveform by superimposing it on the waveform of the first servo information. 5. The servo information waveform display device has a display method selection means for selecting whether or not to perform overlay display on the waveform displayed by the first servo waveform display means. Only when the selection means performs the overlapping display, the second servo information selection means selects the second servo information, the second servo information storage means stores the second servo information, and the second servo information storage means stores the second servo information. 5. The servo information waveform display device according to claim 4, wherein the waveform display of the second servo information is performed by the two-servo waveform display means. 6. At least one of the waveform of the first servo information displayed on the screen by the first servo waveform display means and the waveform of the second servo information displayed on the screen by the second servo waveform display means. 5. The display screen can be moved in the time axis direction on the display screen.
Alternatively, the display device for the servo information waveform as described in 5 above.