JPS6319007A - Data transfer method in numerical controller - Google Patents

Abstract

PURPOSE:To perform a call and execution in a short time, by reading a sub-program from an external storage device to a memory in an NC device before the execution of the sub-program. CONSTITUTION:An NC device 1 is constituted of a central processing unit (CPU), a ROM, a RAM, a various kinds of interfaces, and a servo circuit, etc. To store a great number of NC programs in the NC device, a floppy disk device 3 as the external storage device is connected to the NC device through the interface. In a method to call the NC program stored in the external storage device 2, main NC programs are transmitted from the external storage device 2 to the program memory of the NC device 1, and also, a sub NC program required for an operation is transmitted from the external storage device 2 to the program memory of the NC device 1 in advance, before executing the operation. In this way, it is possible to read and execute both NC programs from the program memory in a short time, at the time of the execution.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention stores main and sub NC programs in an external storage device, and transmits the NC program to be executed from the external storage device to the NC device. Relating to a data transmission method.

[Conventional technology] In recent years, in response to unmanned operation at night and diversification of products, flexible manufacturing cells (F
MC) and flexible manufacturing systems (FMS) have been developed. Along with this,
As the number of NC programs used in the system increases,
The semiconductor memory in the O device alone has become insufficient, and external storage devices such as magnetic disk devices, floppy disk devices, and magnetic tape devices have come to be used in combination with the semiconductor memory. On the other hand, in order to enable unmanned operation at night or for long periods of time, efforts have been made to attach a large number of workpieces to the table of a machine tool.

In this case, due to a failure of the host computer in the FMC or for ease of debugging, the memory of the NC device may be
The programs are multiplexed to reduce the size of the NC program so that one table's worth of programs can be accommodated.
A method is adopted in which the main program calls subprograms corresponding to each processed product. Here, the (1) table-sized machine program is a machine program for a workpiece to be machined that is mounted on one pallet and carried to the table (one pallet is a processing unit).

By the way, ■The number and position of processed products on the table are not necessarily the same, and there is a main program for each table. Therefore, each main program often includes the same subprograms.

Conventionally, the following two methods have been used to execute NC programs in systems such as those described above.

(1) A method in which a host computer has main and sub NC programs, the host computer interprets the NC programs, and sends the programs to the NC device block by block. Here, a program block is a program unit delimited by an EOB (END OFBLOCK) code of a Canadian program.

(2) How to hold the NC program of the host computer 1
A method in which the main program and subprograms necessary for each table are stored all at once, and the programs are transferred for one table at a time when processing that table.

[Problems to be Solved by the Invention] However, the above two conventional methods each have the following problems.

In the case of method (1) above, the semiconductor memory of the NC device can be reduced, but the processing performed by the NC device must be performed by the host computer, which places a heavy burden on the computer.

On the other hand, in the case of method (2) above, the same subprogram is often included in each transfer unit program,
It is necessary to increase the memory of the host computer.

This invention solves these conventional problems.

[Means for Solving the Problems] A data transmission method in a numerical control device of the present invention stores main and sub NC programs in an external storage device, and transfers the NC program to be executed from the external storage device to the NC. In the data transmission method for transmitting to the device, first,
A main NC program is transmitted from the external storage device to the program memory of the NC device, and sub-NC programs that are required in conjunction with the execution of the main NC program are transferred from the external storage device to the NC device in advance. The main and sub NC programs to be transmitted to the program memory of the NC device and executed are read out from the program memory of the NC device.

[Function] The data transmission method in the numerical control device of the present invention includes reading out the subprogram from an external storage device to the memory in the NC device in advance before executing the subprogram.
When executing a subprogram, the subprogram is called from the memory in the NC device in a short time.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the schematic configuration of the NC device will be explained with reference to FIG.

The NC device 1 is usually called a CNC device, and has a built-in microcomputer and the like. - The general configuration includes a central processing unit (CPU), ROM (read only memory) containing control software, RAM (random access memory) as a working area, various interfaces, servo circuits, etc. A floppy disk device 3 as an external storage device 2 is connected to this NC device 1 via an interface in order to store a large amount of NC programs.

In this invention, by devising a method for calling up the NC program stored in the external storage device 2, it is possible to execute an NC program that allows unattended operation for a long time even if the internal memory of the NC device is minimized. The external storage device 2 is not limited to the floppy disk device 3, but may be any device that can store a large amount of data.

Next, an NC program executed by such an NC device 1 will be explained according to its flow (see FIG. 2).

The figure shows an example of main program 00001.

■Execution of this main program oooot is done by NC device l.
Instructions are given from the control panel.

■The ○ooot program is transferred from the external storage device 3 to the NC
It is read into the internal program memory of device I.

■Main program 0 loaded into program memory
0001 are executed sequentially.

This is similar to what the normal NC device 1 does.

-G100 is a subprogram call designation code. Below, the 0 number to be executed is this main program 0
This is a subprogram used in 0001 and must be called at this point. In this example, subprogram 00015, C) 0018 is read into the program memory.

G100 is a temporary calling code, and an M code or T code may also be used.

(2) GIOI is a subprogram call end code, and by executing this code, the subprogram call is canceled. Thereafter, the raised numbers that appear will be executed as subprograms.

This GIOI is also a temporary code.

■M98 is a subprogram execution designation code, and when this execution block is reached, it jumps to the specified subprogram, and after repeating that subprogram the specified number of times,
Return to main program.

In the case of "M98 00015 P5", subprogram 00015 is repeated five times.

■G102 is the subprogram deletion designation code, G10
3 is a subprogram erasure end code, and the subprogram specified between these is erased from the program memory. In this example, subprogram Φ00
15 is deleted.

-8~ Next, the operation according to such a program will be explained.

The NC device 1 executes a main program reading process A, a subprogram reading process B, and a subprogram erasing process C (see FIG. 3). The main program reading process A is executed when the NC device 1 starts in memory operation, and reads the main program from the external storage device 2. The main program is executed in blocks.

Details of this main program reading process A will be described later.

If a subprogram call designation code (0100) is found during execution of the main program, the designated subprogram is read (subprogram read processing B).

After reading it, the subprogram call exit code (
GIOI), subprogram reading processing B is removed from the execution routine. Call specification code (
G100) and the designation of the subprogram are entered, for example, at the beginning of the main program, and the subprogram is called in advance to the memory in the NC device l before the subprogram is executed. The details of this subprogram reading process B will also be described later.

If a subprogram deletion designation code (B102) is found during execution of the main program, the designated subprogram is erased (subprogram deletion processing C). The subprogram to be erased is a previously called subprogram that will no longer be used, and by erasing it, a calling memory area for the subprogram that needs to be executed next is secured. After erasing the subprogram, the subprogram erasure end code (C; I
03), the subprogram deletion process C is removed from the execution routine. The details of this subprogram erasing process C will also be described later.

(1) Main program loading process A In this process,
As mentioned above, the main program is read from the external storage device 2 to the internal program memory 4 of the NC device 1 (
(See Figure 4(C)).

Program memory 4 contains 2 for the main program.
Sector read areas are prepared and these areas are used alternately. The reason why two sectors are prepared as the read area is that the data read speed of the device used as the external storage device 2 is usually slow, and it is necessary to read data in advance during execution of the NC program.

A method of reading the main program using the reading areas of two sectors 1 and 2 will be explained with reference to FIG.

First, it is checked whether the main program stored in sector 1 of program memory 4 is being executed (step Sl). This check is performed based on the presence or absence of the first bit of the execution sector bit 5 (see Figure 4(d)). ) checks the first item in the used memory hit table 6 (see FIG. 4(b)).
Step S2).

When the first bit of the used memory bit table 6 is "0", it means that the program stored in the first sector of the program memory 4 has been executed, or that no program is stored yet.When it is "l", it means that the program stored in the first sector of the program memory 4 has been executed. , which means that it contains unused programs.

When the first bit of the used memory bit table 6 is "l", the process advances to step S4, and when it is "0", the main program is read from the external storage device 2, stored in sector 1 of the program memory 4, and the used memory is read. bit table 6 1
"l" is set at the second step (step S3).

Similarly, for sector 2, steps S4, S5, S6
Processed by The second execution sector bit 5 and the second used memory bit table 6 correspond to sector 2.

The NC program execution routine (not shown) checks the used memory bit table 6, reads out the main program block by block from the program memory 4 containing data into the execution buffer, and executes it. Further, when changing a sector of the program memory 4, a bit is set in the execution sector bit 5 corresponding to the sector to indicate that it is in use.

When it is used, the corresponding execution sector pit 5
is set to “0”. In other words, when changing from reading from sector 1 to reading from sector 2, the first position of the used memory bit table 6 is set to θ'', and when the reading is changed from the opposite, the second position of the used memory bit table 6 is set to θ''. is set to “0”.

In this way, the two sectors of the program memory 4 are used alternately, so that there is no delay in the execution of the NC program.

(2) Subprogram read processing B As described above, subprogram read processing B is entered when there is a subprogram call code (G100) in the process of executing the main program.

The process will be explained below with reference to FIG.

First, in order to search for free space in the program memory 4, the used memory bit table 6 is checked. There are currently n vacancies
If it is the a-th bit, the bit is set to "l" (step S7), and the program is placed in the na-th position of the program name registration table 7 (see FIG. 4(a)) corresponding to that bit. The subroutine name that has been created is stored (step S8). Next, the subprogram is called from the external storage device 2 and stored in the na-th sector of the program memory 4 (step S9).

If the called subprogram does not fit into one sector of the program memory 4, the next free area is searched for and stored there. At the same time, the used memory bit table 6 corresponding to that position is set to "1", and this sector number is stored at the end of the previous sector to clarify in which sector the next subprogram is stored. When the end of data is detected by repeating the above processing, an end mark is stored at the end of that sector in the program memory.

In this way, the subprograms are called from the external storage device 2 and sequentially stored in the free area of the program memory. After storing the number of (1) subprograms, this process is not started until a new subprogram number is specified.

Through the above processing, the data is stored in the empty area of the program memory, so there is no need to perform memory rearrangement or the like during storage. Therefore, the calling operation becomes faster.

(3) Subprogram deletion processing C As mentioned above, when the subroutine deletion code (C; 102) is executed during the main program execution process,
Enter this routine. Program number after this specification (
0 number) is the name of the subprogram to be erased to create space in the program memory. This erasing process is ignored when there are no more targets or when the end code (G103) is executed from the main program.

This process will be explained below with reference to FIG.

Main program subprogram erase code (GI0
2), the program enters this process and searches for the next subprogram number (number 0) from the program name registration table 7 (step 514). The program name is now 000
15, the search results show that it is in the n-th position, and the flag in the used memory bit table 6 corresponding to that position is set to "0" (step 515). next,
It is checked whether there is an end mark or the next sector number at the end of the sector of the program memory at the corresponding position (step 816). If it is the end mark, exit from this routine and return to the main program. If the next sector number is specified, the corresponding memory bit table 6 is checked (step 818), and the flag is set to "0" (step 515).
. Repeat the above operations to erase the contents of the specified subprogram number.

This process is performed for the executed O number until the erase end code (G103) is executed by the main program.

[Effects of the Invention] As explained above, in the data transmission method in the numerical control device of the present invention, the subprogram is read in advance from the external storage device to the memory in the NC device before the subprogram is executed. can be called up from the memory in the NC device and executed in a short time.

[Brief explanation of drawings]

The figure is an explanatory diagram of one embodiment of the present invention, and FIG.
A schematic explanatory diagram of the entire device, Fig. 2 is an explanatory diagram of the main program, Fig. 3 is a schematic explanatory diagram of program processing in the NC device, Fig. 4 is an explanatory diagram of the memory in the NC device, and Fig. 5 is an explanatory diagram of the main program. FIG. 6 is a flowchart for explaining the read process, FIG. 6 is a flowchart for explaining the subprogram read process, and FIG. 7 is a flowchart for explaining the subprogram erase process. l...NC device, 2...external storage device.

Claims (1)

[Claims] In a data transmission method in which a main and sub NC program is stored in an external storage device and an NC program to be executed is transmitted from the external storage device to an NC device, first, the main NC program is transferred from the external storage device to the NC device.
A sub-NC program that is required in conjunction with the execution of the main NC program is transmitted to the program memory of the NC device from the external storage device before execution, and is executed. A data transmission method in a numerical control device, characterized in that main and sub NC programs are read from a program memory of an NC device.