JP3460747B2 - Numerical control unit - Google Patents

Description

Description: 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. . 2. Description of the Related Art In an NC system, a machining target and a sequence program tend to be complicated and large-scale with an increase in the complexity and functions of a system to be controlled. Hours) and NC
There is a demand for easy creation of programs and sequence programs. As a method of solving this, a method of dividing the entire sequence program into several operation elements and operating them in parallel, a method of dividing the sequence program into predetermined steps and executing them in parallel, and a method of dividing the sequence program into functional processing units One that is activated by a preset execution pattern (Japanese Patent Laid-Open No. 2-150923);
One in which a sequence program is divided into functional processing units and activated by an external activation signal (Japanese Patent Application Laid-Open No. 1-281503), and one in which a sequence program is divided into functional processing units and activated by another sequence program (Japanese Patent Application Laid-Open No. Sho 62) -90707). Here, a sequence program divided into functional processing units is called a sub-sequence program. FIG. 5 is an overall block diagram of an NC device.
PLC (Programmable Logic Controller) 2
Are built in the NC device 1. The NC language control unit 3
An 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 input / output signals according to a main sequence program described in a sequence language stored in the storage unit 6. The main sequence program is a program that is always executed, and performs, for example, switch input of a machine, monitoring of an alarm, interlock processing, and the like. The sub-sequence control unit 7 rewrites input / output signals according to a sub-sequence program described in a sequence language stored in the storage unit 8. The sub-sequence program is a program for performing operations such as pallet exchange, tool exchange, gear switching, and the like, respectively. 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 / F. / F12 is an interface between the main sequence control unit 5 and the sub sequence control unit 7 and the machine side. In FIG. 5, a drive control unit for controlling a servomotor and the like is omitted. [0004] The operation of the conventional NC device will be described.
During automatic operation, the NC language control unit 3 sequentially executes an NC program described in the NC language stored in the storage unit 4.
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 executes the main sequence described in the sequence language stored in the storage unit 6. The auxiliary command is determined by the program, and the corresponding sub sequence program is activated via the I / F 10. When the sub sequence program is started via the I / F 10, the sub sequence control unit 7 executes the sub sequence program described in the sequence language stored in the storage unit 8. When the execution result of the sub sequence program is returned to the main sequence control unit 5 via the I / FI0, the main sequence control unit 5 proceeds to the next processing based on the result, and the execution result of the main sequence program is changed to the I / F 9 Is returned to the NC language control unit 3 via the PC, the NC language control unit 3 proceeds to the next process based on the result. [0005] However, a sub-sequence program described in a sequence language has N
In spite of the fact that many operate according to instructions from the C program, the conventional NC device has the above configuration, so that the sub sequence program cannot be directly started from the NC program. That is, auxiliary commands such as M, S, and T are output from the NC program, and the main sequence program detects this command 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 scan time increases. A subsequence program described in a sequence language can perform input / output of machine signals and complicated signal control at a high speed. However, if the same is attempted by an NC program, the program becomes complicated. It is not realistic because it takes time to execute. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an NC apparatus capable of directly starting 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: first storage means for storing a numerical control program described in a numerical control language; Numerical control language control means for reading out the numerical control program stored in the first storage means, performing automatic analysis of the machine tool by performing analysis and calculation, and a second control means for storing a sequence program described in a sequence language Storage means, sequence control means for performing sequence control of the machine tool by a sequence program stored in the second storage means, and a sub-sequence program for performing a specific sequence control described in a sequence language. A third storage unit for storing the machine tool according to a sub-sequence program described in the sequence language. In a numerical control device having a sub-sequence control unit for performing a specific sequence control of a machine, the execution of a sub-sequence program described in a sequence language between the numerical control language control unit and the sub-sequence control unit is controlled. It has a sub-sequence activation management means. The NC apparatus according to the present invention having the above-described configuration has the following features.
NC stored in the first storage means by the C language control means
Executing the program, the sequence control means executing 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 NC language control means to control the sub-sequence control means so that execution of the sub-sequence program can be controlled. Therefore, the sub sequence program can be directly started from the NC program. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG . Hereinafter, a first embodiment of an NC apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an NC unit according to the present embodiment. In FIG. 1, the same reference numerals are given to portions that perform the same functions as those in FIG. 5 showing a conventional example. The NC device 101 according to the present embodiment includes a PLC 102.
And a storage unit 4 as a first storage unit for storing a numerical control program described in a numerical control language, and a numerical control program stored in the storage unit 4 is read, analyzed, and operated to execute An NC language control unit 3 as numerical control language control means for performing automatic control.
The PLC 102 serves as 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 performs sequence control of the machine tool according to the main sequence program stored in the storage unit 6. Main sequence control unit 5
And a third sequence program for storing a sub-sequence program for performing a specific sequence control described in a sequence language.
And a sub-sequence control unit 7 as a sub-sequence control unit 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 is not necessarily a main sequence program, but is a main sequence program here to clarify a difference from a sub sequence program. The present embodiment is characterized in that, in addition to the above configuration, a subsequence program described in a sequence language is further provided between the NC language control unit 3 and the subsequence control unit 7 built in the PLC 102. A subsequence activation management unit 11 as a subsequence activation management means for controlling execution is provided.
That is, a sub sequence program can be directly started from a 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. Hereinafter, the operation of the NC device according to this embodiment will be described. During automatic operation, the NC language control unit 3 sequentially executes the NC programs stored in the storage unit 4. When a control command of the sub-sequence program is included in the NC program, the NC language control unit 3
And the sub-sequence activation management unit 11 controls the sub-sequence control unit 7 to control the execution of the sub-sequence program. Next, control instructions of the sub-sequence program will be described with reference to FIG. NC Program 21
Is executed, if there is a function processing call instruction 22, the designated sub sequence program (SQ001) 23 is started. Sub sequence program (SQ001) 2
3 are sequentially executed, and when the sub sequence program end command (SQFN) 24 is executed, the execution of the sub sequence program (SQ001) 23 is terminated, and the sub sequence program (SQ001) 23 is terminated and the function of the NC program 21 is performed. The processing call instruction 22 is completed, and the subsequent blocks are executed. In this manner, the NC language control unit 3 can directly start the corresponding sub sequence program via the sub sequence start management unit 11 without starting the main 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 and activating the sub sequence program is not required in the main sequence program, so that the main sequence program can be simplified. Embodiment 2 FIG . In the first embodiment, the sub sequence program (SQ001) 23 is called from the NC program 21 in a subroutine, and during execution of the sub sequence program (SQ001) 23,
Although the execution of the program 21 is interrupted, the present embodiment is characterized in that the NC program is controlled by separately providing a function processing start instruction and a function processing stop instruction. An example of this case will be described with reference to FIG. During execution of the NC program 31, if there is a function processing start command (“SQS” in FIG. 3) 32, the specified sub sequence program (SQ 002) on the sub sequence program execution control table 34 managed by the sub sequence start management unit 11 ) The flag for 35 is turned on. When the function processing start instruction 32 is completed, the NC program 31 sequentially executes the next block and the following without interruption.
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 ON. During execution of the NC program 31, if there is a function processing stop command ("SQE" in FIG. 3) 33, the flag for the designated sub sequence program (SQ002) 35 on the sub sequence program execution control table 34 is set. Turned off. The function processing stop instruction 33 is completed together with the operation of the flag in the sub sequence program execution control table 34, and the NC program 31 sequentially executes the subsequent blocks without interruption by the function processing stop instruction 33. When the flag is turned off, the execution of the sub sequence program (SQ002) 35 stops. According to this embodiment, the NC program and the sub-sequence program can be executed in parallel. Also, a plurality of subsequence programs can be started simultaneously from the NC program. Embodiment 3 FIG . In the first embodiment, N
Although a function processing call instruction is provided in the C program, and the sub sequence program is started by directly specifying the sub sequence program, in this embodiment, instead of providing the function processing call instruction, auxiliary programs such as M, S, and T are provided. A table is provided for associating a command with a sub-sequence program, and the corresponding sub-sequence program is activated when the auxiliary command is executed. An example in this case will be described with reference to FIG. During execution of the NC program 41, if there is an auxiliary command (“M10” in FIG. 4) 42, the sub sequence program (“M10” in FIG. 4) SQ003) 44 is activated. The operation after the activation is the same as in the first embodiment, and a description thereof will be omitted. According to the present embodiment, it is not necessary to be particularly aware that the sub sequence program is started in the NC program, and the same NC program as that of the conventional NC apparatus can be used. 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 provided from the NC language control means. Since the sub sequence program is directly started from the NC program by controlling, it is possible to improve the response when the sub sequence program is started from the NC program. Further, since the sequence program for determining the command from the NC language control means and activating the sub-sequence program or the processing in the sequence program becomes unnecessary, the sequence program stored in the second storage means can be used. It can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall block diagram showing a first embodiment of an NC apparatus 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 to be executed and a sub-sequence program called from the NC program in a second embodiment of the NC apparatus according to the present invention. FIG. 4 is a diagram showing a relationship between an NC program to be executed and a sub-sequence program called from the NC program in a third embodiment of the NC apparatus according to the present invention. FIG. 5 is an overall block diagram of a conventional NC device. [Description of Signs] 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 commands, 32 function process start commands, 33 function process stop commands,
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).

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G05B 19/18-19/46 G05B 19 / 02,19 / 05

Claims (1)

(57) Claims: 1. A first storage means for storing a numerical control program described in a numerical control language, and a numerical control program stored in the first storage means is read out. Numerical control language control means for performing automatic control of the machine tool by performing analysis and calculation; second storage means for storing a sequence program described in a sequence language; and a sequence stored in the second storage means Sequence control means for performing sequence control of the machine tool by a program, third storage means for storing a sub-sequence program for performing a specific sequence control described in a sequence language, and a sub-program described in the sequence language Sub-sequence control means for performing a specific sequence control of the machine tool by a sequence program A numerical control device, comprising: a subsequence activation management means for controlling execution of a subsequence program described in a sequence language between the numerical control language control means and the subsequence control means. .