JPH0452832A - Arithmetic control system - Google Patents

Abstract

PURPOSE:To shorten the rewriting time of new program in a program memory by temporarily buffering the new programs to be rewritten in a buffer memory on the arithmetic control device side and then collectively writing the stored programs in the program memory. CONSTITUTION:On the arithmetic control device 1 side, a program buffering part 1g receives programs from a programming device 2 through a communication interface I/F 1f and successively stores the received programs in the buffer memory 1h. As the result, all programs to be changed are stored in the buffer memory 1h. When a program rewriting instruction is outputted from an operation display part 2d, a program change instruction part 2f transmits an instruction to the arithmetic control device 1 side through a communication I/F 2e. On the device 1 side, the command is sent to a rapid program rewriting part 1i through the communication I/F 1f and the rewriting part 1i collectively transfers the contents of the programs in the buffer memory 1h to the program memory 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arithmetic control system that controls input and output of a process according to an arbitrarily set program.

[Conventional technology]

Figure 2 shows, for example, a Mitsubishi plant controller.

1 is a block diagram showing a conventional arithmetic control system shown in a catalog of MELPLAC550, and in the figure, 1
2 is an arithmetic control device, and 2 is a programming device. In addition, in the arithmetic and control unit 1, 1a is a central processing unit (hereinafter referred to as CPU), 1b is a process interface (hereinafter referred to as process I/F) for exchanging signals with processes, and IC is a program executed by CPU 1a. 1d is a data memory that stores data used in calculations; 1e is a programming device 2;
1f is a programming device w that writes the program sent from the program memory 1c into the program memory 1c.
A communication interface (hereinafter referred to as communication I/
F).

Further, in the programming device 2, 2a is a program editing section that edits the program executed by the arithmetic control unit W1, 2c is a storage device that stores the edited program,
2b is a program transfer unit that transfers the program stored in the storage device 2c to the arithmetic control unit W1; 2d is an operation in which the operator gives instructions to the program editing unit 2a and the program transfer unit 2b and displays processing results; The display section 2e is a communication I/F that communicates with the arithmetic and control device 1.

Next, the operation will be explained. When the operator uses the operation display section 2d to input a program to be executed by the arithmetic and control unit 1, the program is sent to the program editing section 2a and then stored in the storage device! 2c. When the operator instructs program transfer using the operation display unit 2d, the program transfer unit 2b reads the program stored in the storage device 2c and transfers it to the arithmetic and control unit 1 via the communication I/F 2e. . On the arithmetic control unit fil side, the program is received via the communication I/Flf, and the program rewriting unit 1e writes the program into the program memory 1c.

On the other hand, when a startup command is given to the CPU 1a, the CPU 1a sequentially reads programs from the program memory 1c and performs control operations according to the programs. That is, it receives a process input signal from the process I/Flb, performs control calculations, and outputs the result as a process 8 output via the process I/Fib. data memory 1d
is used for purposes such as storing intermediate results of control calculations.

[Problem to be solved by the invention]

Since the conventional arithmetic and control system is configured as described above, in order to change the contents of the program memory 1c, a new program is sent from the programming device 2 to the arithmetic and control device ll via communication 1/F2e, if. It was necessary to send it to. Furthermore, since communication generally takes time, it is necessary to temporarily stop the execution of the CPU 1a in order to change the contents of the program memory 1c.
There were issues such as impact on process control.

This invention was made to solve the above-mentioned problems, and it is possible to rewrite programs directly from the buffer memory of the arithmetic and control unit to the program memory, without significantly affecting the execution of the CPU. , quickly program settings.

The purpose is to obtain an arithmetic control system that can implement changes.

[Means to solve the problem]

The arithmetic control system according to the present invention includes a program change instructing unit provided in a programming device and instructing to change the program according to an operation command; with a buffer memory to be
The program from the buffer memory is rewritten into the program memory at high speed by a high-speed program rewriting section in accordance with the above instructions.

[Effect]

In the buffer memory of the arithmetic and control device according to the present invention, a rewrite program is stored by a program buffering section, a program change instruction section of the programming device outputs a program change instruction, and based on the change instruction, high-speed program rewriting is performed. A section operates to write the program in the buffer memory to the program memory.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is an arithmetic control device, and 2 is a programming device. In addition, in the arithmetic and control device 1, 1a is a CP
U, 1b is a process I/F that exchanges signals with the process
, 1c is a program memory where the program executed by the CPU Ia is stored, 1d is a data memory where data used in calculations is stored, and le is a high-speed transfer of the program sent from the programming device 2 and the buffer memory to the program memory 1c. Program rewriting section written in 1
f is a programming device! Communication I/F for communicating with 2
It is. Further, in the programming device 2, 2a is a program editing section that edits the program to be executed by the arithmetic and control device 1, 2c is a storage device that stores the edited program, and 2b is a storage device [which arithmetic controls the program stored in 2c]. 2d is an operation display section where an operator gives instructions to the program editing section 2a and the program transfer section 2b and displays processing results; 2e is a section for communicating with the arithmetic and control unit 1; It is a communication I/F that performs. Further, 1g is a program buffering unit that stores a rewriting program in a buffer memory, 1h is the buffer memory, and 2f is a program change instruction unit provided in the programming device.

Next, the operation will be explained.

The operation when changing the control program stored in the program memory IC will be described.

It is assumed that a program edited by the program editing section 2a is stored in the storage device F2c. Operation display section 2
When a program transfer instruction is issued from d, the program transfer unit 2b reads the program stored in the storage device 2c and transfers the program to the arithmetic control system via the communication I/F 2e. On the arithmetic and control device 1 side, a program buffering section 1g receives the program from the programming device 2 via the communication I/F,
The data are sequentially stored in the buffer memory 1h. As a result, all programs that make changes are stored in the buffer memory 1h.

On the other hand, when a program rewriting instruction is issued from the operation display section 2d, the program change instruction section 2f transfers the instruction to the communication interface.
/ F 2 e to the arithmetic and control unit 1 side.

On the arithmetic and control unit 1 side, the command is sent to the high-speed program rewriting unit 1j via the communication I/F 1f, and the high-speed program rewriting unit 11 collectively writes the program contents in the buffer memory 1h to the program memory 1c based on the command. Forward.

In this way, the program contents can be transferred all at once from the buffer memory 1h to the program memory 1c within the arithmetic and control unit [1], without relying on communication from the programming device. The impact on execution can be kept to a minimum.Although the above embodiment describes the case where the program memory 1c is rewritten all at once, the program memory 1c is divided into several modules and managed, and each module is rewritten. It may also be configured to allow program changes.

〔Effect of the invention〕

As described above, according to this invention, a new program that performs rewriting)
The system is configured so that the programs are buffered all at once in the buffer memory on the arithmetic control unit side and then written to the program memory at once, so the time required to rewrite a new program to the program memory can be shortened, and the program on the arithmetic control unit side can be This has the effect of allowing programs to be rewritten while minimizing the impact on execution.

[Brief explanation of the drawing]

Chapter iv! I is a block diagram showing an arithmetic control system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional arithmetic control system. 1 is an arithmetic control unit, 1c is a program memory, 1h is a buffer memory, 11 is a high-speed program rewriting unit, 2 is a programming device, and 2f is a program change instruction unit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others)

Claims (1)

[Claims] According to the program set in the program memory,
In an arithmetic control system comprising an arithmetic control device that performs process input/output and data arithmetic operations, and a programming device that writes a program to the program memory in accordance with an operation command, the programming device is provided with a computer that programs the program in accordance with the operation command. a buffer memory provided in the arithmetic and control device in which a program to be changed is stored through the programming device; and a program change instruction section for instructing a change in the program; An arithmetic control system comprising: a high-speed program rewriting unit that rewrites programs at high speed;