JPH02140810A - Controller for industrial machine - Google Patents

Abstract

PURPOSE:To attain the sequence operation of a machine when a moving table reaches an objective specified position without fitting a detector to the machine by permitting a programmable controller PC to supervise machine coordinate value data inputted from a numerical control (NC) device. CONSTITUTION:In the NC device 10, a control part 2 and an operation part 3 calculate a present position, and machine coordinate value data corresponding to the calculated present position is always outputted to a PC 30 through a bus 35. The PC 30 reads machine coordinate value data transferring from the NC device 10, judges whether the machine coordinate value agrees with an objective value. When it is YES, it performs the sequence control of the machine. Thus, the sequence operation of the machine can be performed when the moving table 22 reaches the specified position without fitting the detector of a limit switch and the like to the machine.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control device for an industrial machine that controls the operation of machine tools and other industrial machines, and in particular, to a control device for controlling the operation of machine tools and other industrial machines, and in particular, to Industrial machine control that can perform necessary sequence operations by constantly outputting machine coordinate value data to a programmable controller, which is a second control device, and monitoring the input machine coordinate value data at the programmable controller. It is related to the device.

[Prior Art] Fig. 4 is a block diagram for explaining a conventional control device for industrial machinery, and Fig. 5 is a block diagram showing a numerical control device (hereinafter referred to as an NC device). It is an explanatory diagram. In FIG. 4, (1) is a memory, which is composed of a RAM and stores programs and data. (2) is a control unit mainly composed of CPU (2a), and memory (1
) is a part that controls the functions of the NC device according to the system software loaded on the controller. (3) is an arithmetic unit which performs numerical calculations under the control of the control unit (2). (4) is a tape reader, which is a device for reading a paper tape on which an NC processing program has been punched. In addition,
Hereinafter, in this specification, the NC machining program will be referred to as a machine program. (5) is a program interface, (6) is a drive unit including a servo amplifier, etc., (
7) is a motor that drives a controlled machine (hereinafter simply referred to as machine), and (8) is an encoder that outputs a feedback signal. (9) is the input/output signal interface.
Input signals and N required to start or stop the C device
This is an interface for output signals of status signals of the C device and auxiliary function signals for controlling external equipment from the NC device. Note that the medium on which the Canadian program is written is not limited to paper tape, but may also be a floppy disk or the like.

In Fig. 5, (20) is a speed reducer, (21) is a drive mechanism such as a ball screw, (22) is a moving table of the machine,
For example, a lathe is a tool mount, and a machine where the tool does not move is a workpiece mount. Also, (23a)
, (23b), (23c) and (23d) are Rimi, Sotosui, and Sochi, and are attached to the fixed part of the machine, and are signals indicating the position of the moving table (22), i.e., when the machine is specified. It outputs a signal indicating that the position has been reached (this signal is referred to as a specific position arrival signal in this specification).

In the above configuration, the machine operates under the control of the NC device (10) to process the workpiece (not shown). According to the control operation, the workpiece transport device (not shown) performs preparatory operations before the workpiece machining is finished, so that the workpiece that has been machined can be immediately carried out from the machine. Do the following. Note that the signal for reaching a specific position of the machine is not limited to the preparatory operation of the workpiece conveyance device described above, but also for the movement table (2
2) is used to perform some kind of sequence operation when it comes to a specific position.

Note that the sequence operation refers to the operation of the machine based on the control of the PC.

[Problem to be solved by the invention, Jl In the conventional industrial machine control device as described above, a limit switch, which is a detector, is provided at a specific position of the machine to output a signal, so the life of the detector is shortened. However, there were problems such as low reliability and poor economic efficiency.

Furthermore, in recent years -1, instead of the same workpiece flowing on one machining line, several different types of workpieces are flowing on one machining line, and machines automatically change tools according to the workpiece, It has become common practice to process things on one line.

In such a processing line, the size, shape, etc. of the workpieces may change from workpiece to workpiece, so for example, the position of the moving table (22) at which the preparation operation of the workpiece conveyance device is to be performed, In other words, it is necessary to change the specific position of the machine depending on the workpiece.

However, in the conventional device as described above, there is a problem in that the mounting position of the limit switch must be changed, which is very difficult to handle.

This invention was made in order to solve this problem, and is an industry in which it is possible to cause a machine to perform sequence operations when a moving table reaches a specific target position without installing a detector on the machine. The purpose is to obtain a control device for industrial machinery.

[Means for Solving the Problems] A control device for an industrial machine according to the present invention is configured mainly of a memory and a central processing unit, and analyzes and performs calculations on numerical information input via an input device. a first control device that has an information processing section and performs numerical control of the controlled machine based on the output of the information processing section; and a first control device that has at least a memory and a central processing unit that controls the controlled machine according to a predetermined program; a second control device that performs sequence control; a bus connected between the first and second control devices to transmit data between the two;
The first control device is provided with a machine coordinate value data output means that always outputs the machine coordinate value data calculated by the information processing section to the outside, and the second control device is provided with a machine coordinate value data output means that always outputs the machine coordinate value data calculated by the information processing section, and the second control device A machine coordinate value data monitoring means is provided which monitors the coordinate value data and outputs a signal internally when the coordinate value data matches the target value.

Effect C] In this invention, the machine coordinate value data corresponding to the current position of the machine calculated by the first control device that performs numerical control of the controlled machine performs sequence control of the controlled machine. The data is constantly output to the second control device, and the second control device monitors the input machine coordinate value data, and when it matches the target value, outputs a signal and performs sequence control, so it is detected by the controlled machine. Sequence control can be performed at the target position without installing a device. Furthermore, the content can include changing the target position.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of FIG. 1.

In FIG. 1, parts with the same reference numerals as in FIGS. 4 and 5 indicate the same parts, and (12) is a machine coordinate value data memory. ) is a memory that stores machine coordinate value data corresponding to the current position that is constantly calculated.

(15) is the workpiece, (1B) is the tool, (26) is the spindle,
(27) is a spindle motor, and (28) is a spindle controller that controls the drive of the spindle motor.

a, b, and c indicate specific positions of the machine, and for example, when the moving table (22) comes to position a, sequence control of the machine is executed, such as having the workpiece transport device perform preparation operations for unloading the workpiece. It shows the points to be made.

(30) is a PC, which is a control device that performs sequence control of a controlled object according to a predetermined program. (3
I) is a CPU that retrieves the program from memory in a prescribed order, decodes the meaning of the instruction word, and according to the contents of the instruction word, takes in input data, performs logical operations and other operations, sends output data, etc. This is the part that performs the processing. Reference numeral 32 denotes a memory that stores programs as well as calculation results and necessary data. (3
3a) and (33b) are input/output interfaces.

In this specification, pc refers to (al), (32).

(33a) and (8ab) as a basic configuration, and may be a personal computer or the like.

In addition, the NC device (■0) and the PC (30) are connected by a parallel bus (35) via input/output interfaces (33a) and (33b), so that control signals and status signals can be exchanged between them. is carried out via a parallel bus (35).

Next, the operation will be explained according to the flowchart shown in FIG.

First, the operation of the NC device (]0) will be explained.

When the NC device (10) is activated from p c (ao), the NC device (10) starts numerical control of the machine, and in step (Sl), the control unit (2) and the calculation unit (3) The position is calculated. The machine coordinate value data corresponding to the calculated current position is stored in the machine coordinate value data memory (12). The data stored in the machine coordinate value data memory (12) in step (S2) is always stored in the PC (30
) via bus (35)=. Note that the arrows indicated by broken lines in FIG. 2 indicate data transfer via the bus (35).

Next, the operation of the PC (30) will be explained. In step (S21), the machine coordinate value data transferred from the NC device (10) is read. Then step (
In S22), it is determined whether the machine coordinate values match the target values, and if YES, sequence control of the machine is executed in step S23.

Since it operates as described above, the moving table (22
) reaches a specific target position, the machine can be caused to perform a sequence of operations. Furthermore, since the target position can be changed by changing the setting data in the memory of the PC (30), the position can be easily changed.

Normally, as shown in FIG. 3, an NC device cannot operate the next program until after the operation of one program has been completed. In Figure 3, - As an example, ■ indicates axis movement, ■ indicates tool exchange, and ■ indicates arm up and down movement. After completing ■, perform ■ operation, and then perform ■ operation. , and so on, but
According to the embodiment of the present invention, a sequence operation can be performed under the control of the PC (30) in the middle of a program, that is, at point A or point B. Therefore, the working time can be shortened.

For example, when changing tools using an automatic tool changer, the machine is usually returned to its home position, but the tool does not come into contact with other parts during the return to its home position, which is a safety issue. It is possible to shorten the time by setting the last possible point at which there is no problem as a target value and performing a sequence operation, that is, a tool change, at this point.

If you try to do this with a limit switch, it will take a lot of effort to adjust the mounting position of the limit switch. This can be done by setting the time using a timer, but the timer may vary and setting the time may be difficult. According to the above embodiment, the operation can be performed reliably.

Further, even when several types of different types of workpieces are flowing in one processing line, it is easy to handle the situation because target values for each workpiece can be set individually.

Furthermore, the machine coordinate value data is constantly output from the NC device (10) to the PC (30), and the PC (30) refers to that data when necessary.
There is no need for procedures regarding data transmission between the C device (lO) and the PC (30).

For example, a data request is issued from the PC (30). N.C.
The request code in the device (IO) is determined, the request data, for example, the current position data, is extracted and output to the interface. There is no need for procedures such as importing data using p c (ao). Therefore, the necessary data can be obtained without any time lag.

If a machine is stopped at a certain position and you want data on that point, you can obtain the data by following a procedure, but if you want data when the machine is moving, you have to follow a procedure. In the meantime, the machine is moving and moving to another location, so the data obtained is useless. In this respect as well, it is effective to be able to obtain the necessary data without any procedures, that is, without any time lag.

[Effects of the Invention] As explained above, in the present invention, machine coordinate value data corresponding to the current position of the machine calculated by the first control device that performs numerical control of the controlled machine is used for sequence control of the controlled machine. is constantly output to the second control device that performs
The control device monitors the input machine coordinate value data, and when it matches the target value, outputs a signal and performs sequence control, so it is highly reliable, economical, and allows the machine to perform sequence operations. You can change the specific location at will. Furthermore, a sequence operation can be performed in the middle of one block of operation of a program.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of FIG. 1, FIG. 3 is an explanatory diagram for explaining the operation of the embodiment of the invention, and FIG. The figure is a configuration diagram for explaining a conventional control device, and FIG. 5 is an explanatory diagram of a controlled machine. In the figure, (10) is an NC device, (12) is a machine coordinate value data memory, (15) is a workpiece, (16) is a tool,
(22) is a moving table, (30) is a PC, and (35) is a parallel bus. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] The system is mainly composed of a memory and a central processing unit,
A control device that has an information processing unit that analyzes numerical information input through an input device and performs calculations, and that performs numerical control of a controlled machine based on the output of the information processing unit, further comprising: A first control device is provided with a machine coordinate value data output means for constantly outputting machine coordinate value data calculated by the section to the outside, and has at least a memory and a central processing unit, and is controlled according to a predetermined program. The control device performs sequence control of the machine, further comprising machine coordinate value data monitoring means for monitoring machine coordinate value data input from the first control device and outputting a signal to the inside when the machine coordinate value data matches a target value. A control device for an industrial machine, comprising: a second control device provided therein; and a bus connected between the first control device and the second control device and transmitting data between the two.