JPS61208104A - Numerical controller - Google Patents

Abstract

PURPOSE:To shorten a processing time by providing a shared memory which is stored with interchange data among subsystems except in local memories that said subsystems have and accessed by CPUs of the respective subsystems. CONSTITUTION:The respective subsystems 10, 20, and 20 share the shared mem ory 16 without having interchange data 16a-16d with overlaps, and when the subsystem 10 is equipped with the shared memory 16, other subsystems 20 and 30 have only local memories 23a and 33a. Further, three systems 11, 21, and 31 are permitted to access the shared memory 16. Therefore, each CPU inter changes data through the shared memory 16 without using its local memory 13a, 23a, or 33a, so the time required for transfer is shortened and the processing time is shortened eventually.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a numerical control device for numerically controlling a machine tool, etc., and in particular, to a numerical control device for numerically controlling a machine tool, etc. This is related to the memory used.

[Conventional technology]

A conventional numerical control of this type is shown in the conceptual diagram of FIG. In the figure, 1 is a conventional numerical control device, 2 is a paper tape on which input information related to machining of a machine tool, etc. is stored, 3 is a host computer as input information similar to the above-mentioned paper tape 2, and 4 is a paper tape used by the numerical control device 1. Objects to be controlled include controlled machines, switchboards, operation panels, etc. 5 is a machine tool whose movement is controlled among the objects 4 to be controlled. In addition, in the numerical control device 1, a command processing section 10 (hereinafter referred to as a subsystem), a programmable controller 20 such as a sequencer (hereinafter referred to as a subsystem), and a servo control section 30 (hereinafter referred to as a subsystem) are commonly connected. is,
By receiving an input command signal from input information such as an external paper tape 2, the machine tool 5 etc. connected to the outside is automatically controlled. FIG. 4 is a block diagram showing details of each subsystem of the numerical control device 1 shown in FIG. 3 above. 11 in Ig.
Reference numerals 21 and 31 indicate central processing units (hereinafter referred to as CPUs) provided in the respective subsystems 10, 20, and 30, and have buses IOA, 2OA, and 30A, respectively.

12.22.32 is l10 (input/output port) for interfacing with external devices; 13.23.
Reference numerals 33 denote local memories 13m, 23b in which exchange data 13b, 23b, 33b between each subsystem are stored, as shown in FIG. 5, respectively.

33b. 14 is a PC link for connecting the subsystem 10 of the command processing unit to the programmable controller 20 when exchanging information, that is, transferring data, and is used together with the NC link 24 in the programmable controller 20. A data transfer path between the subsystems 10 and 20 is formed by data buffers (not shown) each of which is provided inside the subsystems. Similarly, subsystems 10 and 30
Servo link 15 and NCI for connecting each inside
A link 35 is provided. FIG. 3 shows the memory 13 provided in each of the above-mentioned subsystems 10, 20, 30.
, 23. 33 and the state of data transfer between each subsystem 10, 20, and 30, and each memo! 713, 23.33 are the exchange data 13b of the subsystems 10 to 30 that should exchange information, respectively.
and the data area where subsystems 10 and 2 are stored.
0°30 It is divided into local memory areas required by itself. And subsystem 10°20.
Each data exchanged between the CPU II, 21.30 and 21.21.
31 to the memories 13.23 to 33 of the other subsystems 10 to 30.

The conventional numerical control device is configured as described above, receives a command signal regarding the controlled object 4 from the paper tape 2 or the host computer, and processes the CPU II of the command processing section, the programmable controller, and the subsystems 10, 20, and 30 of the servo control section. 21 and 31 exchange information with other subsystems 10 and 20 to 30, respectively, according to the control program,
The control object 4 is automatically controlled and the machine tool 5 is moved. In such an operation, the above information exchange occurs between the memory 13°23.33 in each subsystem 10.20.30.
Information is exchanged while exchange data is stored in a data area. In the case of FIG. 3, first, the subsystem 10 of the command processing section receives a command signal from, for example, the paper tape 2, and the CPU II gives a command to the subsystem 10 of the programmable controller according to the contents of the command.
The C input data is stored in the data area for exchange data 13b of the memory 13. The above PC output data is further CP
The above P is sent to the memory 23 of the subsystem 20 by U11 via the PC link 14 and NC link 24 in FIG.
Data that is exactly the same as the C input data is stored as NC output data.

The above operations are performed between the subsystems 10, 20, and 30 as shown in the state diagram of FIG. ■−
1. ■-2 procedure or subsystem 1 as necessary
It is held between 0.20.30 and 20.30. Therefore, the above explanation,
Or each subsystem 10 as is clear from FIG.
, 20.30, the exchange data 13b, 23b, 33b stored in the memory areas of the memories 13, 23.33 of the other subsystems 10., 20.30, respectively. Alternatively, data having the same contents as the exchange data 13b, 23b, and 33b of 20, 30, and 30 are stored redundantly. Duplicate data in FIG. 5 are PC input data in the memory 13, ONC output data in the memory 23, PC output data in the memory 13, NC input data in the memory 23, and memo! Servo input data of 713.23, PC output data of memory 33, and memory 13
．． 23 servo output data and memory 33 PC input data.

[Problem that the invention seeks to solve]

As mentioned above, conventional numerical control devices have redundant exchange data that is the same as the memory contents of other subsystems in the memory of a subsystem, which makes the numerical control device as a whole uneconomical, and the exchange data The number of control programs for each CPU to transfer data increases and the processing time required increases, making high-speed data transmission difficult.Furthermore, the sequencer's PC-based subsystem is unable to fully utilize the sequencer's inherent processing capabilities, such as sequence processing. There were problems such as pressure.

This invention was made to solve the above-mentioned problems, and it is possible to minimize the memory area in which exchanged data is stored for the entire device, and also to enable data transfer to other subsystems. It is an object of the present invention to provide a numerical control device that does not require a control program and the time required for transfer processing of exchange data.

[Means for solving problems]

In a numerical control device according to the present invention, in a numerical control device having a plurality of subsystems, data exchanged between the subsystems is stored in addition to the local memory of each subsystem, and data is transferred from the CPU of each subsystem to the shared memory. By providing a shared memory that can be accessed through each I/F, servo information and PC information are stored in a unified data format.

[For production]

The shared memory in this invention is provided to share servo information and PC information to a plurality of subsystems without duplication, and can be accessed in a straight line from the CPU of each subsystem. The area is greatly reduced, a control program for controlling exchanged data between subsystems is no longer required, and data transfer between the subsystems is no longer necessary, thereby speeding up processing time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
In the figure, 10, 20, and 30 are subsystems of a command processing section, a programmable controller, and a servo control section, respectively, of the numerical control device according to the present invention. cpUll provided within 0,20.30,21
, 31. and l1012, 22, 32, and the motor drive circuit 34 are exactly the same as those with the same reference numerals in FIG. 4 showing the conventional example. Also, in fig.

13m, 23m, and 33m are local memories 13M and 23 among the memories 13 and 23.33 in FIG. 5 in the conventional example.
1.33 is separated into one memory, and the exchange data 13b in the data area.

23b and 33b are not included. 16 commonizes the exchange data 13b, 23b, 33b so as not to overlap, and the CPU II of each subsystem 10, 20, 30,
From 21.31 to each shared memory I/F17, 27.3
This is a shared memory that can be directly accessed via 7. Reference numeral 18 is a battery backup power source such as a battery for preserving the state of the stored contents of the shared memory 16 so that they will not be destroyed in the event of a power outage such as a power outage.

FIG. 2 is a state diagram showing the flow of data between the shared memory 16 of FIG. 1 and the main parts to be accessed.

As shown in the figure, the shared memory 16 is such that the exchange data 13b, 23b, 33b in FIG.
Input data 15a, PC output data 16b1, servo input data 16C, and servo output data 16d are stored, and each CPU 11.21.31 has its own local memory 13m.
, 23-. Each of the above data is accessed while referring to 33m.

In the numerical control device configured as described above, each subsystem 10, 20, 30 does not have redundant exchange data 1ea to 16d, but shares the shared memory 16, and in the case of FIG. In the subsystem 10
If the subsystem 2 is equipped with a shared memory 16, other subsystems 2
0.30 is local memory 23. ．． It is only 33m long.

Also, the shared memory is three CPU II, 21.31
For exchange data, these CPUs can access data directly from their own local memory 13a only by using the shared memory.

23-. 33& is not used.

In the above embodiment, the shared memory 16 is provided in the subsystem 10 of the command processing section, but the subsystem 2
Of course, it may be set within 0 or 30.

〔Effect of the invention〕

As described above, according to the present invention, since the configuration includes a shared memory that can be commonly accessed by the CPUs of a plurality of subsystems each having local memory, it is possible to replace the memory that was conventionally provided in the memory within each subsystem. The memory area of the data area for storing data is reduced to one-third (1/3) of the entire numerical control device, and a control program for data transfer between each system is no longer required. This has the effect of providing an economical, high-speed numerical control device that can process data inherent to each subsystem, such as eliminating the time required.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a numerical control device according to an embodiment of the present invention, Fig. 2 is a state diagram showing the flow of data between the main parts of Fig. 1, and Fig. 3 is a conventional complex numerical control device. FIG. 4 is a conceptual diagram for explaining the control device, FIG. 4 is a block diagram showing each subsystem in a conventional numerical control device, and FIG. 5 is a block diagram showing the flow of data between the main parts of FIG. 4. In the figure, 1 is a numerical control device, 10, 20, 30 are subsystems, 11, 21, 31 are CPUs, 16 is a shared memory, and 18 is a battery backup power source. Incidentally, the same reference numerals in each figure indicate parts or corresponding parts.

Claims (2)

[Claims] (1) In a numerical control device that has multiple subsystems that issue movement commands and sequence control to a controlled object under the control of a CPU based on external command signals, information is exchanged between the multiple subsystems. A numerical control device characterized by comprising a shared memory in which exchange data is stored and is commonly accessible from the CPUs of the subsystems. (2) The numerical control device according to claim 1, wherein the shared memory is provided with a battery backup power source for protecting data when power is cut off.