JPH0836412A - Numerical control system - Google Patents

Abstract

PURPOSE:To reduce the load on a bus for read of data of a numerical controller at the time of displaying data of the numerical controller on the screen on the man-machine interface controller side. CONSTITUTION:A man-machine interface controller 2 connected to the numerical controller through a bus 3 is provided with a key input detection means 2a which detects key input, a counter means 2b which determines the data read timing, and a data read and update means 2c which reads in data and updates the display. The counter means 2b increments contents when the key input detection means 2a doesn't key input, and the contents are cleared when contents exceed a preliminarily determined certain value or the key input detection means 2a detects key input, thus reducing the frequency in communication between the man-machine interface controller 2 and the numerical controller to a required minimum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control system comprising a numerical controller, a programmable machine controller and a man-machine interface controller, and more particularly to a man-machine interface controller.
The present invention relates to a numerical control system having a function of displaying data of a numerical control device or the like on a controller.

[0002]

2. Description of the Related Art Numerical control systems mainly include a numerical control unit for executing control of the entire numerical control system and control of a servomotor, and control of machine tools by receiving various function signals from the numerical control unit. A programmable machine that receives various switch signals from the machine and controls, for example, the actuator of a hydraulic cylinder of a machine tool.
It consists of a controller and a man-machine interface controller that functions as an interface between the operator and the numerical control system. They are,
Each has a microprocessor configuration and is connected to each other by a bus.

FIG. 4 is a block diagram showing the configuration of a conventional numerical control system. In the figure, 1 is a numerical controller /
Programmable machine controller (CNC / PM
C), and these two functions are collectively shown in one block. 2 is a man-machine interface
A controller (MMC), which is connected to the numerical controller / programmable machine controller 1 by a bus 3.

A CRT (Cathode Ray Tu) is provided in the man-machine interface controller 2 which functions as an interface between an operator and a numerical control system.
be) and a CRT / manual data input (CRT / MDI) unit 4 having operation keys are connected. The operator can know the state of the numerical control system from the CRT and can input necessary data through the operation keys.

The man-machine interface controller 2 displays dynamic data of, for example, a numerical controller connected via the bus 3, for example, position information such as axis coordinates or data such as tool offset. , While not performing input processing,
The user uses the bus 3 to read and rewrite all the display data, or rewrite only the changed data in order to increase the processing speed for display.

[0006]

However, in the man-machine interface controller 2, in order to constantly monitor the data of the numerical control device when there is no key input, the numerical control device / programmable machine controller 1 is used. And the man-machine interface controller 2 must be in constant communication, which is essentially
This is an extra load on the bus 3 for control purposes, and during that time, not only other processors connected to the bus cannot operate, but also the numerical controller cannot move at the moment when the data stored in the memory is read. Therefore, the original operation of the numerical controller may be affected. Further, while the man-machine interface controller 2 is performing the processing of reading such data and updating the display, the processor cannot perform the following processing,
In particular, there is a problem that smooth cursor movement may not be possible when high-speed key processing such as cursor movement is required.

The present invention has been made in view of such a point, and data of a numerical control device, etc.
An object of the present invention is to provide a numerical control system that does not affect the original operation of a numerical control device or the like when it is displayed on the screen of the interface controller side.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a numerical controller, a programmable machine controller, and a man-machine interface
In a numerical control system including a controller, the man-machine interface controller coupled to the numerical controller and the programmable machine controller via a bus is a key input detection for detecting a key input by an operator. Means for incrementing the content when the key input detecting means does not detect a key input, and when the content exceeds a predetermined value or when the key input detecting means detects a key input, Counter means for clearing the contents, and data reading / updating for updating the display by reading the data of the numerical controller or programmable machine controller when the contents of the counter means exceed a predetermined constant value. Means and Numerical control system is provided that.

[0009]

According to the above-mentioned means, when the man-machine interface controller side is displaying the data of the numerical controller or the programmable machine controller, when any key input is made, the key operation is performed. The display data is fixed without being updated even if the data is changed on the side of the numerical control device or the programmable machine controller. The function of the counter means allows the data reading / updating means to read the data and update the display in a cycle of the fixed time after the fixed time elapses after no key input.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a numerical control system according to the present invention. In this figure, the same or equivalent parts as those shown in FIG. 4 are designated by the same reference numerals. That is, the numerical control system of the present invention is a numerical control device / programmable machine controller (CN).
C / PMC) 1 and man-machine interface controller (MMC) 2, which are interconnected by a bus 3. Man machine
The interface controller 2 includes a keyboard 4a
And a CRT / manual data input (CRT / MDI) unit 4 having a display device 4b is connected.

The man-machine interface controller 2 has a key input detecting means 2a and a counter means 2b.
And a data reading / updating means 2c. The key input detecting means 2a receives the output of the keyboard 4a of the CRT / manual data input unit 4 and detects whether or not there is a key input by the operator.
When the key input detecting means 2a does not detect a key input, the counter means 2b does not normally read the data and update the display, but sequentially increments the counter value. When the content of the counter means 2b exceeds a predetermined fixed value, data reading /
The updating means 2c reads the data and updates the display. At this time, the contents of the counter means 2b are cleared. The counter means 2b also clears its contents when the key input detecting means 2a detects a key input.

In this way, the counter means 2b always increments the content when there is no key input, and when the value exceeds a predetermined value, that is, When there is no key input for a certain period of time, the data is read and the display is updated, and when the data is read and the display is updated and when there is a key input, the contents are cleared. Therefore, normally, while the key operation by the keyboard 4a is performed, the function is prioritized, and during the key operation, the display of the screen is fixed without reading the data and updating the display at all, and each time the key is input. The contents are cleared and the count value for the fixed time measurement is returned to zero.
This is because the operator's consciousness is suitable for key operation while performing some key operation, so even if the display is not updated immediately even if part of the data is updated during that time, there is a substantial effect. Because there are few.

FIG. 2 is a flow chart showing the operation when displaying data. When a predetermined screen is displayed on the display device 4b of the CRT / manual data input unit 4, the processing from the start to the end of this flowchart is repeatedly executed.

First, the key input detecting means 2a determines whether or not there is a key input (step S).
1). If it is determined in step S1 that there is no key input, the counter value of the counter means 2b is sequentially incremented by one (step S2).

Then, whether the counter value of the counter means 2b reaches a predetermined constant value, that is, the counter means 2 usually having a predetermined counting capacity.
It is determined whether or not the count of b has ended (step S3). The time to reach this constant value is set to about 500 milliseconds, for example. When the counter value of the counter means 2b becomes a constant value, the data is read and the display is updated (step S4), and then the counter value is cleared (step S5).

If it is determined in step S3 that the counter value is less than the predetermined value, the process ends. When it is determined in step S1 that there is a key input, an operation associated with a key operation, for example, when offset data is input, an input character is echoed back and the cursor is moved to select something. If you are trying to do so, move and display the cursor (step S
6). Then, it progresses to step S5 and clears a counter value.

The conventional technique is applied as it is to the step of reading data and updating the display in step S4. That is, data of the numerical control device, for example, position information or tool offset, or a programmable machine controller, for example, via a bus, reads ladder data, compares it with the stored original data, and compares it with the original data. If it has been changed, the display is updated only for that data.

In the CRT / manual data input unit 4 of the man-machine interface controller 2, a numerical control device connected to the bus 3 /
As a screen for displaying the data of the programmable machine controller 1, for example, relative coordinates, absolute coordinates,
Position display such as machine coordinates and remaining movement amount, editing of numerical control program, program screen such as MDI program, program check, setting screen such as data input / output, tool offset, work origin offset, macro variable, tool life management, etc. There is a message screen such as the history of alarms generated by the numerical control device and operation messages.

FIG. 3 is a diagram showing an example of the display screen. This example shows the status display screen 10. The menu bar 11 displays a menu used for screen selection, the title bar 12 displays the title of the current screen, and the currently selected screen is displayed. An application display unit 13, a status display unit 14 that displays the state of the numerical control device, a CNC message display unit 15 that displays an alarm message of the numerical control device, and function keys that display the operations that can be performed by the function keys. And a display unit 16.

The program number 14a and the sequence number 14b are displayed in the upper part of the status display section 14,
In the middle row, the position display 14 that displays the current position in relative coordinates
c, status display 14 for displaying the state of the numerical control device
d and date / time display 14e for displaying date and time
Is placed, and the actual speed 1 that displays the actual speed is shown in the lower row.
4f and a spindle rotation speed of 14g indicating the spindle rotation speed are displayed. These display values are updated to the changed data, if any, when the screen is rewritten every 500 milliseconds.

By selecting F10 (enlargement) of the function key display section 16 in the display state shown in the figure, the status display section 14 is displayed on the entire screen.

[0022]

As described above, according to the present invention, when the data of the numerical control device and the programmable machine controller is displayed on the man machine interface controller side, if there is any key input, the work is performed. Since the display data is fixed, the data is read and the display is updated at the fixed time period after the fixed time has passed since there was no key input, so there was a key input. In this case, there is a dead zone corresponding to the screen rewriting cycle at maximum at the beginning, but after the response to the key input is started, the response becomes smooth thereafter. Moreover, since the data is read only when necessary, the load of the bus used for reading can be reduced, and the numerical control device and programmable machine controller can concentrate on the original control work. Like

[Brief description of drawings]

FIG. 1 is a block diagram showing a numerical control system according to the present invention.

FIG. 2 is a flowchart showing an operation when displaying data.

FIG. 3 is a diagram showing an example of a display screen.

FIG. 4 is a block diagram showing a configuration of a conventional numerical control system.

[Explanation of symbols]

1 Numerical control device / Programmable machine controller 2 Man-machine interface controller 3 Bus 4 CRT / manual data input unit

Claims (5)

[Claims] 1. A numerical controller, a programmable machine controller, and a man-machine interface.
In a numerical control system including a controller, the man-machine interface controller coupled to the numerical controller and the programmable machine controller via a bus is a key input detection for detecting a key input by an operator. Means for incrementing the content when the key input detecting means does not detect a key input, and when the content exceeds a predetermined constant value or when the key input detecting means detects a key input, Counter means for clearing the contents, and data reading / updating for updating the display by reading the data of the numerical controller or programmable machine controller when the contents of the counter means exceed a predetermined constant value. And means that Numerical control system to be. 2. The man-machine interface controller is the numerical controller or a programmable controller.
A means for storing the data read from the machine controller and displayed is provided, and when the data is read next time, the data is compared with the stored data, and only the data changed with respect to the data reading / updating means is provided. The numerical control system according to claim 1, wherein the display is updated. 3. The numerical control system according to claim 1, wherein the counter means is set to a time corresponding to a screen rewriting cycle as the predetermined constant value. 4. The numerical control system according to claim 1, wherein the data of the numerical control device is data for forming a position display screen, a program screen, a setting screen, or a message screen. 5. The numerical control system according to claim 1, wherein the data of the programmable machine controller is data for forming a ladder display screen or a ladder data display screen.