JPS63213036A - Control method for programmable controller - Google Patents

Abstract

PURPOSE:To shorten a time needed for the rearrangement of arithmetic control parts by backing up previously a program module and a bit managing information for the execution after division of pages. CONSTITUTION:When the 3rd page of a program module (a) is broken in the program memory on an arithmetic control part, this control part transfers this trouble information to a managing part 3 together with the information on the program module No.(a) and the page No.3. Thus the part 3 refers to a page map table 24 and a link table to retrieve and read out a head page No.(i) and the l-th page of an object memory 26a and loads only the 3rd page of the program module No.(a) into the arithmetic control part. Thus the arithmetic control part rewrites the faulty page of the program memory and carries out again an arithmetic operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for destroying a program module disposed in one of a plurality of arithmetic control units in a programmable control device. The present invention relates to a control method for a programmable control device that can restore a module in a short time.

[Conventional technology]

Figure 3 shows, for example, the document "Fault Tolerant Computer" (Nikkei Electronics, May 9, 1983).
1 is a block diagram schematically illustrating the configuration of a conventional multiprocessor-type programmable control device shown in FIG. 3 is a maintenance tool for inputting and editing each program/module in which a control program is divided into a plurality of functional units, and instructing execution of the program/module; -1) to (1-N), a management unit that arranges program modules and manages module execution;
5 is a shared memory that can be commonly accessed by the arithmetic control units (1-1) to (1-N) and the input/output device unit 4; Arithmetic control units (1-1) to (1-N), management unit 2. Input/output device section 4. This is a system bus that connects shared memories 5 in parallel.

FIG. 4 is a block diagram showing the internal configuration of the management section 3.
In the figure, 10 is a central processing unit (hereinafter referred to as CPU)
, 20 is a system memory that stores system hardware management information and software management information, and 21 is module information that is located in the system memory 20 and has all program modules currently registered in the system as a backup. A storage section 22 is a module map table that is located in the module information storage section 21 and holds the start address and step number of the object of each program module; This is object memory that stores objects.

FIG. 5 is a block diagram illustrating one of the calculation control units (1-1) to (1-N) as the calculation control unit 1,
In the figure, 30 is a CPU, 40 is a program memory,
41 is a module map table in the program memory 40 that holds the start address and step number of objects of each program module arranged in the arithmetic control unit 1; 42 is an object memory in the program memory 40; , a part of the object memory 23 in the system memory 20 of the management unit 3.

Next, the operation will be explained. Arithmetic control unit (1-1) ~ (
If a part of the program module in any of the calculation control units (1-N) is destroyed, or if any of the calculation control units (1-1) to (1-N) malfunctions, In this case, the management unit 3 reads out the destroyed program module or all program modules located in the malfunctioning arithmetic control unit from the module information storage unit 21 in the system memory 20, and updates the program module.
Relocate modules and continue calculation.

[Problem that the invention seeks to solve]

Conventional control methods for programmable control devices are performed as described above, so even if part of a program module in a certain arithmetic control unit is destroyed, the entire program module must be relocated. First, there was a problem in that the processing time from failure to re-execution was long.

The present invention has been made to solve the above-mentioned problems, and aims to shorten the time required to relocate program modules and provide a control method for a programmable control device with short failure times.

[Means for solving problems]

A method for controlling a programmable control device according to the present invention includes:
Program modules are stored in separate pages in each arithmetic control unit, and program modules placed in each arithmetic control unit and management information for their execution are backed up in the management unit or shared memory. The information is divided into pages and stored, and when the memory of a certain page of the arithmetic control unit is destroyed, the management unit uses the faulty program module number and faulty page number included in the failure information from the arithmetic and control unit. Only that page information of that program module is displayed in the module.
This allows the program to be reloaded from backup information and re-executed.

[Function] When a part of an internal program module is destroyed, the arithmetic control unit in this invention records the program module number (hereinafter referred to as "positive") of the destroyed part and its page height as failure information. The management unit reads only the page information of the program module from the module backup information and reloads it to the failed arithmetic control unit.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Also in the present invention, the basic configuration of the programmable control device is the same as that of the conventional device shown in FIG. What is different is the module information storage unit 21 of the management unit 3 or shared memory 5 and the program memory 40 of the calculation control units (1-1) to (1-N), so the diagrams of these parts will be explained below. .

However, in the following description, a case will be described in which the module information storage section 21 is located within the management section 3.

FIG. 1 is a block diagram showing an example of the configuration of the management section 3 used in the present invention. In the figure, 3 is the management section, 10 is the CP
U, 20 is a system memory, and 21 is a module information storage section. Reference numeral 24 is a page map table in the module information storage unit 21 that holds the first page number and page number of a program module, 25 is a link table that holds the next page number of each page, and 26 is a program page for each page.・Object memory where module objects are stored.

FIG. 2 shows the arithmetic control units (1-1) to (1-1) used in the present invention.
1 is a block diagram illustrating one of the N) as an arithmetic control unit 1, and in the figure, 1 is an arithmetic control unit, 30 is a CPU, and 4 is an arithmetic control unit.
0 is program memory. Inside the program memory 40, similar to the module information storage unit 21 in the management unit 3,
It is composed of a page map table 43, a link table 44, and an object memory 45.

Next, a method of controlling such a programmable control device will be explained.

Now, if the third page of the program module (a) in the program memory 40 on the arithmetic control unit 1 is destroyed, the arithmetic control unit 1 will write program module number a and page-3 together with the failure information. The information is attached and transferred to the management section 3. Upon receiving this, the management section 3 refers to the page map table 24 from the information "program module number a" and learns that the first page is page i.

Since the faulty page is the third page, by referring to the link table 25 twice, it is learned that the faulty page is stored in the t-th page of the object memory 26, and the page is read out. Furthermore, only the third page of this program module 14a is reloaded into the failed arithmetic control section 1.

After rewriting the faulty page in the program memory 40, the calculation control unit 1 executes the calculation again.

In the above embodiment, the module information storage section 21 is provided in the management section 3 shown in FIG. 3, but it may be provided in the shared memory 5 shown in FIG. 3 instead, and the same effect can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the program module of each arithmetic control unit and the module backup information of the management unit or shared memory are stored in separate pages, so that they can be managed in page units. Therefore, if a part of the program module in the arithmetic control section is destroyed, the destroyed program
Only that page of the module needs to be reloaded from the management section or the module backup information in the shared memory, which has the effect of allowing failures to be repaired in a short time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a management section that implements a control method for a programmable control device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the configuration of an arithmetic control section of this invention, and FIG. The figure is a block diagram showing a conventional programmable control device system configuration used in the present invention and FIG. 4 is a block diagram showing an example of the configuration of a conventional management section, and FIG. 5 is a block diagram showing an example of the configuration of a conventional arithmetic control section. It is. (1-1) to (1-N) are calculation control units, 2 is a maintenance tool, 3 is a management unit, 4 is an input/output device unit, 5 is a shared memory, 10 is a CPU, 20 is a system memory, and 21 is a module 30 is a CPU, and 40 is a program memory. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A plurality of arithmetic control units each having a function of accommodating and executing each program module in which a control program is divided into a plurality of functional units, and managing the execution of the entire program module including each of the arithmetic control units. In the method for controlling a programmable control device, the programmable control device includes a management unit for controlling the program and a shared memory with each of the calculation control units and the management unit, wherein each of the calculation control units stores each of the program modules in divided pages. Further, each of the program modules arranged in each of the arithmetic and control units and management information for their execution are stored in page divisions as module backup information in the management unit or the shared memory. , when the memory of a certain page of the arithmetic control unit is destroyed, the management unit updates the page information of the program module based on the faulty program module number and faulty page number included in the fault information from the arithmetic and control unit. A control method for a programmable control device, characterized in that only the module is reloaded from the module backup information to make it re-executable.