JPH0259903A - Program transfer control system for pc - Google Patents

Abstract

PURPOSE:To omit the transfer of a memory area having no information and to shorten time required for reading by transferring only an effective part including information. CONSTITUTION:In the case of writing a sequence program stored in a RAM 30 in a ROM 71, an label 80 indicating the effective size of the program 31 is written in the ROM 71 and then the program 31 is transferred from the RAM 30. In the case of reading out the program 31 from the ROM 71, the label 80 is read out, the effective size of the program 31 is checked and an area in the ROM 71 corresponding to the size shown by the label 80 is transferred to the RAM 30. Consequently, useless operation for transferring also an area including no information can be omitted and the time required for program transfer can be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a program transfer control method for a PC (programmable controller), and in particular, writing a sequence program to a ROM cassette and transferring a program from the ROM cassette to a built-in RAM in the PC. The present invention relates to a program transfer control method for a PC that controls the sequence program reading to a PC.

[Conventional technology]

To save the sequence program stored in the PC's RAM, connect a ROM writer to the PC and use the PCl3)
17) Writing the sequence program from RAM to the ROM cassette on the RoM writer.

Also, when reading, the R
The sequence program is transferred from the OM cassette to the PC's RAM.

[Problem to be solved by the invention]

However, in the conventional control method, the entire memory area of the ROM cassette was transferred to the PC's RAM, which resulted in the transfer of memory areas that did not contain information, resulting in unnecessarily long read times. Ta.

The present invention was developed in view of the above problems, and an object of the present invention is to shorten the time required for reading by transferring only the effective portion containing information.

[Failure to solve the problem]

In order to solve the above problems, the present invention provides a program transfer control method for a PC that controls writing of a sequence program to a ROM connected to a ROM writer and reading of the sequence program from the ROM to a RAM. - writing a label indicating the effective size of the program into the ROM; storing the sequence program in the ROM; reading the label from the ROM; There is provided a program transfer control method for a PC, comprising the steps of: reading out an area of the ROM corresponding to the size of the ROM to the RAM;

[Effect]

When storing a sequence program in a ROM cassette, a label indicating the effective size of the sequence program is also stored.

When reading from the ROM cassette, the label is first read, the effective size of the sequence program is checked, and a memory area of that size is transferred to the RAM.

〔Example〕

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

FIG. 1 shows a block diagram of hardware for implementing the program transfer control method of the present invention.

In the figure, 10 is a PC, and 11 is a processor for controlling the entire system. An input circuit 12 receives a signal from the outside, converts the signal level, and transfers it to the bus 14. 13 is an output circuit, which outputs an internal output signal to the outside.

20 is a ROM built into the PCIO, and inside it is a management program 2 that manages the execution of user programs.
1st prize is stored.

30 is a RAM in which a sequence program 31 is stored. Input signals, output signals, auxiliary relay signals, internal register signals, etc. are also stored here.

An interface 40 connects the bus 14 and an MDI (manual data input) 50. MD
r 50 has a liquid crystal display device 51 and operation keys 52 .

60 is an interface for the ROM writer, and bus 1
4 and the ROM writer 7o. 71 is a ROM cassette, 72a and 72b are a ROM writer 70 and RO
This is a connector for connecting to the M cassette 71.

The sequence program 3I is entered from the operation key 52 of the MDI 50 and stored in the RAM 30. To save this sequence program 31, the RAM 30
Sequence program 31 from to ROM writer 7o
The ROM 71 connected to the ROM writer 70
Write the sequence program 31 to.

When reading a saved sequence program, connect the ROM cassette 71 to the ROM writer 7o,
The sequence program 31 stored in R'0M71 is transferred to the RAM 30.

FIG. 2 shows a conceptual diagram of the program transfer control system of the present invention. A sequence program is stored in the PCIO RAM 30, but not all of the memory area of the RAM 30 contains information. The size of the area containing information is illustrated as the effective size.

When writing the sequence program stored in the RAM 30 to the ROM 71, a label 80 indicating the effective size of the sequence program is written in the ROM 71, and then the sequence program is transferred from the RAM 30.

When reading a program from the ROM 71, first read the label 80 to check the effective size of the sequence program, and then transfer the area of the ROM 71 of the size indicated by the read label to the RAM 30. .

This makes it possible to eliminate the waste of transferring even areas that do not contain information.

〔Effect of the invention〕

As explained above, in the present invention, only the effective part containing the program is transferred, so that the time required for program transfer can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of hardware for implementing the PC program transfer control method of the present invention, and FIG. 2 is a conceptual diagram of the program transfer control method of the present invention. 1 3---------・ 20- ・・ 31-・ 40-・ PC (programmable controller) Processor input circuit output circuit bus... ROM built into the PC Management program AM - Sequence program MDI interface Fintaface 0−・−−1−−・− 5 2−−−−−−・−・ 60・−・・−・−・・ 70−・−・−1−−−・ 7 1−−− ---1...72a, 72b MDI (manual data dump) Liquid crystal display device, operation keys, ROM writer for ROM writer, ROM cassette, ------Connector interface, I patent Applicant Fanuc Co., Ltd. Agent Patent Attorney Takeshi Hattori Figure 1

Claims (1)

[Scope of Claims] In a program transfer control method for a PC that controls writing of a sequence program to a ROM connected to a ROM writer and reading of the sequence program from the ROM to a RAM, an effective size of the sequence program is provided. storing the sequence program in the ROM; reading the label from the ROM; and writing a label indicating the read label into the ROM. A program transfer control method for a PC, comprising the steps of: reading an area of a ROM to the RAM.