JPS63288305A - Working program storage system - Google Patents

Abstract

PURPOSE:To continue the working without suspending the working, by reading out the other same program, in case one working program is read out in the course of working and abnormality has been detected. CONSTITUTION:A parity check circuit 4 executes a parity check as to whether the abnormality exists in a working program or not, before executing the working program. Usually, the working program of a working memory 2 is read out, and while checking it by the parity check circuit 4, the working is executed. Unless the abnormality exists, the working is continued as it is. If the abnormality is detected by the parity check circuit 4, a working program of the same part is read out of a memory 3, and executed. As for a unit of the working program, the check is executed at every block unit, or executed as to several blocks together, or executed as to prescribed bytes together, and its unit is selected by length of the working program to be executed, the reliability of the memory, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a machining program storage method for a numerical control device, and in particular to a machining program that improves reliability by storing the same machining program in two memories. Concerning storage methods.

[Conventional technology]

Due to the lower price and larger capacity of semiconductor memory, systems that store large capacity machining programs are now widely used in numerical control devices.

However, if there is a memory error, the operation of the numerical control device is stopped without performing any processing, and the memory is replaced.

There is also an error correction code system, but the range in which it can be corrected is limited, and if the entire memory element becomes defective, it cannot be corrected.

[Problem that the invention seeks to solve]

Therefore, when an abnormality occurs in the memory, conventionally there is no choice but to stop the operation of the numerical control device and replace the printed circuit board of the memory, which poses a problem in that the numerical control device goes down during that time. Especially when the workpiece is expensive and complex,
Machining times are slow and therefore machining programs are long, numerically controlled machine tools are expensive, and losses due to downtime are expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a machining program storage system that improves reliability by storing the same machining program in two memories.

[Means for solving problems]

In order to solve the above problems, the present invention uses a machining program storage system having a means (4) for detecting an abnormality in a machining program stored in a memory, as shown in FIG. t0 written in the memory (2, 3) of
There is provided a machining program storage method characterized in that, when there is an abnormality in one memory (2), the machining program in the other memory (3) is read out and machining is executed. Ru.

[Effect]

If an abnormality is detected when reading one of the machining programs during machining, read the other same program.
Machining can be continued without interruption.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention.

In the figure, 1 is a processor that performs overall control, 2 and 3
are memory I and memory for storing machining programs■
The same machining program is stored in the same capacity. The memory (2) and the memory (3) may be configured using the same chip but have separate areas for use, or may be configured using different elements.

However, if one element as a whole becomes defective, it is advantageous to configure it with separate elements. Reference numeral 4 denotes a parity check circuit, which performs a parity check before executing the machining program, even if there is no abnormality in the machining program. The other position control circuits, I10 interface, RAM, ROM, etc. are the same as those of the known numerical control device, so they are omitted.

Normally, the machining is performed by reading out the machining program from the memory 12 and checking it with the parity check circuit 4. If there are no abnormalities, processing can continue as is.

If an abnormality is detected in the parity check circuit 4,
The machining program for the same location is read from memory 3 and executed. The unit of the machining program is to check each block, several blocks at once, or a certain number of bytes at once.The selection of the unit depends on the length of the machining program to be executed and the reliability of the memory. Selected by etc.

FIG. 2 shows a block diagram of the second embodiment. In the figure, 1 is a processor, 2 is a memory (2), and 3 is a memory (2). As in the first embodiment, the same machining program is stored in the memory I2 and the memory 3. 5 is a machining program, as shown in the figure, the appropriate size,
For example, it is divided into 128 bytes and its checksum 5a is written. This checksum is used to check for any abnormalities before executing the machining program. Of course, this check is performed by the processor 1 software. As in the first embodiment, normal machining requires memory! 2. Read and execute the machining program.

The checksum is checked, and if there is no abnormality, processing continues. If there is an abnormality, the same block of the machining program in memory 3 is read out and executed.

In the above embodiment, the machining program in memory I is executed for normal machining, and the machining program in memory 2 is executed when an abnormality occurs, but the reverse is also possible. Furthermore, memory 1 and memory 1 are alternately stored in each block.
It is also possible to execute the contents of 1.

〔Effect of the invention〕

As explained above, in the present invention, the same machining program is stored in two memories, and when one memory is abnormal, the machining program in the other memory is executed. can continue.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment of the invention, and FIG. 2 is a block diagram of a second embodiment of the invention. １−−１−−・・・−・−Processor ２−・−−−１−−−−・・・・Memory■３・・・・・・−
・－－－－・〜・・Memory■4・・－－－－－１－－・
・・−Parity check circuit 5−−−−−−・・−・−
Processing program 5 a--------・Check 4 Tsum Patent applicant Fananoku Co., Ltd. agent Patent attorney Clothes 611 Kibo Figure 1 Figure 2

Claims (3)

[Claims] (1) In a machining program storage method that has means for detecting an abnormality in a machining program stored in memory, the same program is stored in separate memories, and if there is an abnormality in one memory, the error in the other memory is detected. A machining program storage method characterized in that the machining program is read out and machining is executed. (2) Claim 1, characterized in that the abnormality detection method of the machining program is a parity check method.
Machining program storage method described in Section 2. (3) The machining program storage method according to claim 1, wherein the abnormality detection method of the machining program is a checksum method.