JPH08286717A - Numerical control device - Google Patents

Abstract

PURPOSE: To provide an NC(numerical control) device which can directly start a subsequence program on an NC program. CONSTITUTION: An NC device 101 has a PLC 102 including an NC language control part 3 which performs the automatic control of a machine tool on an NC control program stored in a storage part 4, a main sequence control part 5 which performs the sequence control of the machine tool based on the main sequence program stored in a storage part 6, and a subsequence control part 7 which performs the specific sequence control of the machine tool based on the subsequence program that is stored in a storage part 8 for the specific sequence control. Furthermore, a subsequence start management part 11 is added between the parts 3 and 7 to control the execution of the subsequence program. In such a constitution, the subsequence program is directly started based on an NC program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control (hereinafter referred to as NC) device, and more particularly to an NC device capable of efficiently processing a sequence program from an NC program.

[0002]

2. Description of the Related Art NC devices tend to be large-scale with the complexity of control target systems and the increase of functions as well as the complexity of machining programs and sequence programs, while shortening the processing time (especially the execution time of sequence programs). NC
There is a demand for facilitating the creation of programs and sequence programs. As a method of solving this, the whole sequence program is divided into several operation elements and operated in parallel, the sequence program is divided into predetermined steps and executed in parallel, and the sequence program is divided into functional processing units. , Which starts with a preset execution pattern (JP-A-2-150923),
One in which a sequence program is divided into functional processing units and activated by an external activation signal (Japanese Patent Laid-Open No. 1-281503), one in which a sequence program is divided into functional processing units and activated by another sequence program (Japanese Patent Laid-Open No. 62-62150). -90707). Here, a sequence program divided into functional processing units is called a sub-sequence program.

FIG. 5 is an overall block diagram of the NC device.
PLC (Programmable Logic Controller) 2
Are built into the NC device 1. The NC language control unit 3
The NC program written in the NC language stored in the storage unit 4 is decoded, and automatic control is performed according to the NC program.
The main sequence control unit 5 rewrites the input / output signals according to the main sequence program stored in the storage unit 6 and written in the sequence language. The main sequence program is a program that is always executed, and performs, for example, switch input of a machine, monitoring of alarms, interlock processing, and the like. The sub-sequence control unit 7 rewrites the input / output signals according to the sub-sequence program stored in the storage unit 8 and described in the sequence language. The sub-sequence program is a program for performing a specific function such as pallet exchange, tool exchange, and gear change. An interface (hereinafter referred to as I / F) 9 is an interface between the NC language control unit 3 and the main sequence control unit 5, an I / F 10 is an interface between the main sequence control unit 5 and the sub sequence control unit 7, and a machine input / output I / F12 is an interface between the main sequence controller 5 and the sub-sequence controller 7 and the machine side. In FIG. 5, the drive control unit that controls the servo motor and the like is omitted.

The operation of the conventional NC device will be described.
During automatic operation, the NC language control unit 3 sequentially executes the NC programs stored in the storage unit 4 and written in the NC language.
When the NC language control unit 3 outputs auxiliary commands such as M, S, and T via the I / F 9 during execution of the NC program, the main sequence control unit 5 causes the main sequence described in the sequence language stored in the storage unit 6 to be described. The auxiliary command is discriminated by the program, and the corresponding sub sequence program is started via the I / F 10. When the sub-sequence program is activated via the I / F 10, the sub-sequence control unit 7 executes the sub-sequence program stored in the storage unit 8 and described in the sequence language. When the execution result of the sub sequence program is returned to the main sequence control unit 5 via I / FI0, the main sequence control unit 5 moves to the next process based on the result, and the execution result of the main sequence program is I / F9. When it is returned to the NC language control unit 3 via, the NC language control unit 3 moves to the next process based on the result.

[0005]

However, the sub-sequence program written in the sequence language is N
Although many conventional NC devices operate according to instructions from the C program, the NC program cannot directly activate the sub-sequence program because of the above configuration. That is, auxiliary commands such as M, S, and T are output from the NC program, and the main sequence program detects these commands and activates the sub sequence program. Therefore, the response time when the sub sequence program is started from the NC program depends on the structure of the main sequence program, and the main sequence program is complicated.
However, there is a problem in that the scan time increases as well as the scan time.

The sub-sequence program described in the sequence language can perform input / output of machine signals and complicated signal control at high speed, but if the same is attempted by the NC program, the program becomes complicated. It is also unrealistic because it takes time to execute.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an NC device capable of directly activating a sub-sequence program from an NC program.

[0008]

In order to achieve the above object, a numerical control device according to the present invention comprises a first storage means for storing a numerical control program written in a numerical control language, and the first storage means. Numerical control language control means for automatically controlling the machine tool by reading out the numerical control program stored in the storage means for analysis, calculation, and second storage means for storing the sequence program described in the sequence language. And a sequence control means for controlling the sequence of the machine tool by the sequence program stored in the second storage means, and a third sequence storing a sub-sequence program for performing a specific sequence control described in a sequence language. Memory means and a sub-sequence program written in the sequence language to specify a specific system of the machine tool. In a numerical controller provided with a sub-sequence control means for controlling a sequence, a sub-sequence activation management for controlling execution of a sub-sequence program written in a sequence language between the numerical control language control means and the sub-sequence control means. It is characterized by having means.

[0009]

The NC device according to the present invention having the above structure is
NC in which C language control means is stored in the first storage means
Executing the program, the sequence control means executes the sequence program stored in the second storage means,
Furthermore, the sub-sequence control means executes the sub-sequence program stored in the third storage means.
At this time, the sub-sequence activation management means between the NC language control means and the sub-sequence control means controls the sub-sequence control means by the NC language control means so that the execution of the sub-sequence program can be controlled. Therefore, the sub-sequence program can be directly activated from the NC program.

[0010]

EXAMPLES Example 1. Hereinafter, a first embodiment of an NC device according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an NC device according to this embodiment. It should be noted that in FIG. 1, the same reference numerals are given to portions that perform the same functions as in FIG. 5 showing the conventional example. The NC device 101 in the present embodiment is the PLC 102.
And a storage unit 4 as a first storage unit for storing a numerical control program written in a numerical control language, and a numerical control program stored in the storage unit 4 is read out, analyzed, and calculated to realize a machine tool It has an NC language control unit 3 as a numerical control language control means for performing automatic control.
The PLC 102 is a storage unit 6 as a second storage unit that stores a main sequence program described in a sequence language, and a sequence control unit that controls the sequence of the machine tool by the main sequence program stored in the storage unit 6. Main sequence controller 5
And a sub-sequence program for performing a specific sequence control described in a sequence language.
And a sub-sequence control section 7 as sub-sequence control means for performing a specific sequence control of the machine tool by a sub-sequence program described in a sequence language. In addition,
The sequence program handled by the storage unit 6 and the main sequence control unit 5 does not necessarily have to be the main sequence program, but in order to clarify the difference from the sub sequence program, the main sequence program is used here.

A characteristic of this embodiment is that, in addition to the above configuration, a sub-sequence program written in a sequence language is provided between the NC language control unit 3 and the sub-sequence control unit 7 built in the PLC 102. The sub-sequence activation management unit 11 is provided as a sub-sequence activation management means for controlling execution.
That is, the sub-sequence program can be directly activated from the C program. That is, N
The C language control unit 3 controls the sub sequence control unit 7 via the sub sequence activation management unit 11.

The operation of the NC device according to this embodiment will be described below. During automatic operation, the NC language control unit 3 sequentially executes the NC programs stored in the storage unit 4. When there is a control command for the sub sequence program in the NC program, the NC language control unit 3 causes the sub sequence activation management unit 11 to operate.
The sub-sequence activation management unit 11 controls the sub-sequence control unit 7 to control the execution of the sub-sequence program.

Next, the control command of the sub-sequence program will be described with reference to FIG. NC program 21
When the function processing call instruction 22 is issued during execution of the above, the designated sub sequence program (SQ001) 23 is activated. Sub-sequence program (SQ001) 2
3 are sequentially executed and the sub sequence program end instruction (SQFN) 24 is executed, the execution of the sub sequence program (SQ001) 23 is ended, the sub sequence program (SQ001) 23 is ended, and the function of the NC program 21 is executed. The processing call instruction 22 is completed, and the subsequent blocks are executed.

In this way, the NC language control unit 3 can directly activate the corresponding sub sequence program via the sub sequence activation management unit 11 without activating the May sequence program. The response when the sequence program is started is improved. In addition, a program for determining a command from the NC language control unit 3 in the main sequence program and activating the sub sequence program is unnecessary, and the main sequence program can be simplified.

Example 2. In the first embodiment described above, the sub-sequence program (SQ001) 23 is called from the NC program 21 in a subroutine manner, and the NC is executed while the sub-sequence program (SQ001) 23 is being executed.
Although the execution of the program 21 is suspended, the present embodiment is characterized in that the NC program is separately provided with a function process start command and a function process stop command for control.

An example of this case will be described with reference to FIG. When there is a functional process activation command (“SQS” in FIG. 3) 32 during execution of the NC program 31, a designated sub-sequence program (SQ002) on the sub-sequence program execution control table 34 managed by the sub-sequence activation management unit 11 is detected. ) The flag for 35 is turned on. When the function processing start instruction 32 is completed, the NC program 31 is not interrupted and sequentially executes subsequent blocks.
The sub sequence program (SQ002) 35 is repeatedly executed while the flag for the sub sequence program (SQ002) 35 on the sub sequence program execution control table 34 is turned on.

If there is a functional process stop command ("SQE" in FIG. 3) 33 during execution of the NC program 31, the flag for the designated sub sequence program (SQ002) 35 on the sub sequence program execution control table 34 is changed. Turned off. The functional processing stop instruction 33 is completed together with the flag operation of the sub-sequence program execution control table 34, and the NC program 31 sequentially executes the subsequent blocks and thereafter without interruption by the functional processing stop instruction 33. The execution of the sub-sequence program (SQ002) 35 is stopped by turning off the flag.

According to this embodiment, the NC program and the sub-sequence program can be executed in parallel. Also, a plurality of sub-sequence programs can be started simultaneously from the NC program.

Example 3. In the first embodiment, N
Although the C program is provided with the function processing call instruction, and the sub sequence program is directly specified to activate the sub sequence program, in the present embodiment, instead of providing the function processing call instruction, auxiliary functions such as M, S, and T are provided. It is characterized in that a table for associating a command with a sub-sequence program is provided, and the corresponding sub-sequence program is activated when the auxiliary command is executed.

An example of this case will be described with reference to FIG. When an auxiliary command (“M10” in FIG. 4) 42 is present during execution of the NC program 41, a sub-sequence program (a “M10” in FIG. 4) associated with a sub-sequence program registration table 43 managed in advance by the sub-sequence activation management unit 11 ( SQ003) 44 is activated. The operation after being activated is the same as that of the first embodiment, and thus the description thereof is omitted.

According to the present embodiment, it is not necessary to pay attention to the fact that the sub-sequence program is activated in the NC program, and the NC program similar to the conventional NC device can be used.

[0023]

As described above, according to the present invention, the sub-sequence activation management means is provided between the NC language control means and the sub-sequence control means, and the sub-sequence control means is controlled by the NC language control means. Since the sub-sequence program is activated directly from the NC program, the response when the sub-sequence program is activated from the NC program can be improved.

Further, since the sequence program for discriminating the command from the NC language control means and activating the sub-sequence program or the processing in the sequence program is not required, the sequence program stored in the second storage means is not required. It is possible to simplify.

[Brief description of drawings]

FIG. 1 is an overall block diagram showing a first embodiment of an NC device according to the present invention.

FIG. 2 is a diagram showing a relationship between an NC program executed in the first embodiment and a sub-sequence program called from the NC program.

FIG. 3 is a diagram showing a relationship between an NC program executed and a sub-sequence program called from the NC program in the second embodiment of the NC device according to the present invention.

FIG. 4 is a diagram showing a relationship between an NC program executed and a sub-sequence program called from the NC program in the NC device according to the third embodiment of the present invention.

FIG. 5 is an overall block diagram of a conventional NC device.

[Explanation of symbols]

1, 101 NC device, 2, 102 PLC (programmable logic controller), 3 NC language control unit, 4, 6, 8, storage unit, 5 main sequence control unit, 7 sub-sequence control unit, 9, 10 I / F, 1
1 Sub-sequence activation management unit, 12 Machine input / output I /
F, 21, 31, 41 NC program, 22 function processing call instruction, 23 sub-sequence program (S
Q001), 24 sub-sequence program end instruction, 32 functional processing start instruction, 33 functional processing stop instruction,
34 Sub-sequence program execution control table, 3
5 sub-sequence programs (SQ002), 42 auxiliary commands, 43 sub-sequence program registration tables, 44 sub-sequence programs (SQ003).

Claims (1)

[Claims] 1. A first storage means for storing a numerical control program written in a numerical control language, and a machine tool by reading the numerical control program stored in the first storage means, performing analysis and calculation. A numerical control language control means for automatically controlling the machine tool, a second storage means for storing a sequence program written in a sequence language, and a sequence control for the machine tool by a sequence program stored in the second storage means. Sequence control means for performing, a third storage means for storing a sub-sequence program for performing a specific sequence control described in a sequence language, and a specific sequence of the machine tool by the sub-sequence program described in the sequence language In a numerical controller provided with a sub-sequence control means for performing sequence control Numerical control apparatus characterized by having a sub-sequence start management means for controlling the execution of the sub sequence program written in a sequence language between the sub-sequence control unit and the numerical control language control means.