JP2000056991A - Micro computer programmable controller provided with multi-task function and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the Iack of a register and to simultaneously and efficiently execute a plurality of programs. SOLUTION: This micro computer programmable controller is provided with plurality of program blocks #1-#n, local registers which are detached and arranged, a global I/O register 300 having a global register allocated to an independent memory area which is not affected by the generation/deletion of the respective program blocks #1-#n and an I/O register for making digital input/output, analog input/output and encoder input into registers and processing them, and a multi-task program execution unit 100 outputting a control signal for simultaneously executing programs and controlling input/output. Information used in common in the respective block programs #1-#n is stored in the global register, and local information is stored and managed in the local registers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a microcomputer programmable controller having a multitasking function and a control method therefor.

[0002]

2. Description of the Related Art Conventionally, in a programmable logic controller used in industrial electric and electronic fields,
Various operations are executed by a control program for controlling the programmable logic controller. Then, in order to improve the performance of the programmable logic controller, a large number of programs are simultaneously executed by the multitask function.

[0003]

However, in the above-mentioned conventional programmable logic controller,
Since the number of registers used is limited, when trying to create a program for executing various operations in the programmable logic controller, register shortages frequently occur.

The present invention solves the problems of the above-mentioned conventional programmable logic controller, can prevent the shortage of registers, and can efficiently execute a plurality of programs simultaneously by a multitasking function. An object of the present invention is to provide a microcomputer programmable controller having a multitasking function and a control method thereof.

[0005]

For this purpose, a microcomputer programmable controller having a multitasking function according to the present invention comprises a plurality of program blocks each storing an instruction to be executed,
Corresponding to each of the program blocks, and respectively disposed separately from each other, and allocated to a local register that manages local information, and an independent memory area that is not affected by generation and deletion of each of the program blocks, A global register for managing information commonly used between program blocks, and a global register having an I / O register for registering and processing digital input / output, analog input / output, and encoder input.
It has an I / O register and a multitask program execution unit that outputs a control signal for simultaneously executing programs stored in the respective program blocks and controls input / output.

In another microcomputer programmable controller having a multitasking function of the present invention, each of the program blocks is a set of data for executing the program, and all of the data necessary for executing the program. And independently execute programs without affecting each other.

In another embodiment of the microcomputer programmable controller having a multitasking function of the present invention, a header information storing a program counter, a block start address and a block end address corresponding to each program block. A program block storage unit in which a command word to be executed is stored, and a local register storage unit in which necessary information is stored and managed in each program block.

The header information storage unit, the program block storage unit, and the local register storage unit both generate and delete the program block.

In another embodiment of the microcomputer programmable controller having a multi-task function, the multi-task program execution unit outputs a control signal for executing a multi-task to each of the program blocks. A central processing unit, a program block counter that is controlled by the central processing unit, and specifies a program block in which a program to be executed among the program blocks is stored, a program block selecting unit that selects the specified program block, An execution command storage unit that temporarily stores the command stored in the selected program block, and a command decoding unit that is controlled by the central processing unit and decodes the command stored in the execution command storage unit ,
A computing unit controlled by the central processing unit to compute a decoded instruction word, using the I / O register while the central processing unit controls computation or data input / output according to a program instruction An I / O register availability check unit for checking whether the I / O register can be used when the need arises, and the I / O register
An I / O port register conversion unit is provided for updating the contents of an I / O register to be used by the central processing unit or outputting the I / O register to the outside based on a check result by the register availability check unit.

In the method of controlling a microcomputer programmable controller having a multitasking function according to the present invention, data controlled by a program formed for each of a plurality of program blocks, and data commonly used among the program blocks is independent. Local information that is stored in the global register allocated to the specified memory area and used only in the program block is stored and managed in the local register in the corresponding program block, without executing another input / output instruction. , I
The present invention is applied to a microcomputer programmable controller having a multitasking function in which an I / O port is registered and used.

In the multi-task program execution unit, one of the program blocks is selected, and an instruction stored in the selected program block is sent to the multi-task program execution unit. Performing and controlling according to the instruction in the execution unit,
Check whether the instruction for operation and control has contents related to input / output, and if the contents are related to input / output, check whether the I / O register is used in the multitask program execution unit. Judge whether
If used, the contents of the used I / O register are updated or output to the outside, and then the operation and control on the I / O register are performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of a control section of a microcomputer programmable controller having a multitask function according to an embodiment of the present invention. FIG. 2 is a microcomputer programmable controller having a multitask function according to an embodiment of the present invention. FIG. 3 is a detailed diagram of a control unit.

As shown in the figure, the control unit is provided in correspondence with a plurality of program blocks # 1 to #n and each of the program blocks # 1 to #n and separately from each other. A program block unit 200 having a local register for managing local information, a global I / O register 300, and a control signal for simultaneously executing programs stored in the program blocks # 1 to #n are output. It has a multitask program execution unit 100 that controls input and output. In each of the program blocks # 1 to #n, an instruction to be executed, that is, an instruction word created in a machine language is programmed, stored in blocks, and stored. The global I / O register 300 manages information and the like commonly used among the program blocks # 1 to #n, and is not affected by generation and disappearance of the program blocks # 1 to #n. It has a global register 301 assigned to an independent memory area, and an I / O register 302 for registering and processing digital input / output, analog input / output, and encoder input. The I
The / O register 302 is generated and deleted as needed by the central processing unit 105.

Each of the program blocks # 1 to #n is a set of data for executing the program, includes all information necessary for executing the program, does not affect each other, and is independent of the program. Is to be executed. The information commonly used among the program blocks # 1 to #n is stored in the global register 3.
01 and used only in each of the program blocks # 1 to #n is stored in a local register.

The program blocks # 1 to #n
Forms a program block storage unit 202,
A program counter (PC # 1 to PC # n), a block start address (BSA # 1 to BSA # n) and a block end address (BEA # 1 to BEA # n) are stored in correspondence with the program block storage unit 202. A header information storage unit 201 and a local register storage unit 203 including a local register for storing and managing necessary information in each of the program blocks # 1 to #n are provided.

The program blocks # 1 to #n are generated and deleted by creating a program. And the program counter, block start address,
The block end address and the local register are also generated and deleted together with the corresponding program blocks # 1 to #n.

In this case, since each of the local registers is generated and erased together with the corresponding program block # 1 to #n, it is effective only in each of the program blocks # 1 to #n. Therefore, even if local registers in different program blocks # 1 to #n have the same name, the local registers are used as individual registers that do not affect each other.

On the other hand, the global I / O register 3
00 is valid in all the program blocks # 1 to #n. Each of the program blocks # 1 to #n refers to the global I / O register 300 to process and operate data.

The multitask program execution unit 100 outputs a control signal for executing a multitask to each of the program blocks # 1 to #n, and is controlled by the central processing device 105. A program block counter 10 for designating program blocks # 1 to #n in which a program to be executed among the program blocks # 1 to #n is stored.
4. a program block selection unit 103 for selecting the designated program blocks # 1 to #n; an execution instruction storage unit 101 for temporarily storing the instructions stored in the selected program blocks # 1 to #n; Central processing unit 1
05, a command decoding unit 102 for decoding the command stored in the execution command storage unit 101, an arithmetic unit 106 controlled by the central processing unit 105 to calculate the decoded command, an I / O It comprises an O register availability check unit 107 and an I / O port register conversion unit 108.

The I / O register availability check section 107
While the central processing unit 105 controls operations or input / output of data in accordance with instructions of a program,
When it becomes necessary to use the register 302, the I / O
Check if the O register 302 can be used. The I / O port register conversion unit 10
Reference numeral 8 updates the contents of the I / O register 302 to be used by the central processing unit 105 or outputs the contents to the outside based on the inspection result by the I / O register availability checking unit 107.

Next, a control method of the microcomputer programmable controller having the multitask function will be described.

First, when a plurality of programs are to be executed at the same time, instruction words created in machine language are programmed,
It is divided into blocks and stored in program blocks # 1 to #n. When each of the program blocks # 1 to #n is formed, the central processing unit 105 sequentially increases the value of the program block counter 104 in order to execute the multitask function. To #n, and the specified program block is selected by the program block selection unit 103.

The program block selecting section 103 moves the machine language designated by the program counter in the corresponding program block and waiting for execution to the execution instruction word storage section 101. Then, the program counter increases the pointer value to execute the next command.

At this time, the central processing unit 105 specifies the next program block by updating the value of the program block counter 104. Thereby, each program is sequentially executed by the number of program blocks # 1 to #n, and a multitask is executed.

On the other hand, the instruction word moved to the execution instruction word storage unit 101 is decoded by the instruction word decoding unit 102, and then executed by the central processing unit 105. As a result, an operation or input of data is performed. Output control is performed. To this end, the I / O register 302 is constituted by a functional register having not only a function of storing data but also an input / output function.

Then, I / O is performed by a user program.
Writing data to the register 302 (input),
The I / O register 302 has a specific function so that data can be read or output from the O register 302.

If it is necessary to change the contents of the I / O register 302 while the arithmetic processing or input / output control is being performed by the central processing unit 105,
The / O register 302 indicates that the central processing unit 105 has an I / O
Before the value of the O register 302 is changed, processing for changing or outputting the content is automatically performed based on the inspection result of the I / O register availability check unit 107.

That is, the central processing unit 105 controls the I / O
When it becomes necessary to use the O register 302, the I / O
The O-register availability check unit 107 outputs the I / O register 3
02 is being used. And I /
When it is determined that the O register 302 is in use, the central processing unit 105 immediately changes the contents of the I / O register 302 for the input register by the I / O port register converter 108, and Is output to the outside so that a new command can be received.

In this case, the input / output data is I / O
Since input / output by hardware is automatically controlled only by being stored in the register 302, the I / O port register conversion unit 108 can be executed even if another input / output instruction is not executed.
The hardware I / O port is registered and used. Therefore, the I / O register 302 and the hardware directly exchange input / output via the I / O port register conversion unit 108.

Further, control is performed by a program formed for each of the program blocks # 1 to #n, and data commonly used among the program blocks # 1 to #n is allocated to an independent memory area. Each program block # 1 is stored in the global register 301.
Since local information used only in #n is stored and managed in local registers in the corresponding program blocks # 1 to #n, it is possible to prevent shortage of registers as much as possible. Instead, the efficiency of the system at the time of creating and executing a program can be increased.

Since the I / O register 302 for registering and processing digital input / output, analog input / output, and encoder input is provided, there is no need to execute another input / output instruction.

The present invention is not limited to the above embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0034]

As described above in detail, according to the present invention, in a microcomputer programmable controller having a multitasking function, a plurality of program blocks each storing an instruction word to be executed, Corresponding to each program block, and
A local register which is provided separately from each other and manages local information, and information which is allocated to an independent memory area which is not affected by generation and extinction of each of the program blocks, and which is commonly used among the program blocks. Global I / O register having an I / O register for registering and processing digital input / output, analog input / output and encoder input, and a program stored in each of the program blocks. A multi-task program execution unit that outputs control signals for simultaneous execution and controls input / output.

In this case, information controlled by a program formed for each program block and commonly used among the program blocks is stored in a global register allocated to an independent memory area. Since the local information to be used is stored and managed in a local register in the corresponding program block, it is possible not only to prevent a shortage of registers from occurring, but also to create and execute a program at the time of program creation and execution. The efficiency of the system can be increased.

An I / O for registering and processing digital input / output, analog input / output and encoder input.
Since the / O register is provided, there is no need to execute another input / output instruction.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control unit of a microcomputer programmable controller having a multitask function according to an embodiment of the present invention.

FIG. 2 is a detailed diagram of a control section of a microcomputer programmable controller having a multitask function according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 multitask program execution unit 101 execution instruction word storage unit 102 instruction word decoding unit 103 program block selection unit 104 program block counter 105 central processing unit 106 operation unit 107 I / O register availability check unit 108 I / O port register conversion unit 201 Header information storage unit 202 Program block storage unit 203 Local register storage unit 300 Global I / O register 301 Global register 302 I / O register

Claims (5)

[Claims] (A) a plurality of program blocks each storing an instruction word to be executed; and (b) a plurality of program blocks each corresponding to each of the program blocks and separated from each other. (C) a global register which is allocated to an independent memory area which is not affected by the generation and erasure of each program block, and which manages information commonly used among the program blocks; and A global I / O register having an I / O register for registering and processing input / output, analog input / output, and encoder input; and (d) for simultaneously executing programs stored in the program blocks. It has a multitask program execution unit that outputs control signals and controls input / output. A microcomputer programmable controller having a multitasking function. 2. Each of the program blocks is a set of data for executing the program, includes all information necessary for executing the program, and independently executes the program without affecting each other. A microcomputer programmable controller having a multitasking function according to claim 1 to execute. 3. A header information storage unit storing a program counter, a block start address and a block end address, and a program block storage unit storing an instruction to be executed, corresponding to each of the program blocks. And a local register storage unit in which necessary information is stored and managed in each program block is provided. (B) The header information storage unit, the program block storage unit, and the local register storage unit are generated and erased as program blocks. A microcomputer programmable controller having a multitasking function according to claim 1 or 2, further comprising: 4. The multi-task program execution unit outputs a control signal for executing a multi-task to each of the program blocks, and is controlled by the central processing device. A program block counter for designating a program block in which a program to be executed is stored; a program block selector for selecting the designated program block; and an execution instruction for temporarily storing a command stored in the selected program block Word storage,
A command decoding unit that is controlled by the central processing unit and decodes a command stored in the execution command storage unit; an arithmetic unit that is controlled by the central processing unit and calculates the decoded command; When the necessity of using the I / O register arises while the device controls operations or input / output of data according to the instructions of the program,
An I / O register availability checking unit for checking whether the O register can be used, and an I / O register to be used by the central processing unit based on a check result by the I / O register availability checking unit. 2. The microcomputer programmable controller having a multitasking function according to claim 1, further comprising an I / O port register converter for updating the content of the O register or outputting the content to the outside. 5. Data controlled by a program formed for each of a plurality of program blocks and commonly used among the program blocks is stored in a global register allocated to an independent memory area. The local information used by is stored and managed in a local register in the corresponding program block, without executing another input / output instruction,
In a control method of a microcomputer programmable controller having a multitasking function in which an I / O port is registered and used, (a) selecting one of the program blocks from the program blocks in a multitasking program execution unit , (B)
Sending the instructions stored in the selected program block to the multi-task program execution unit, (c) performing operations and controls in accordance with the instructions in the multi-task program execution unit, and (d) executing instructions for the operations and controls. (E) If the content is related to input / output, determine whether the I / O register is used in the multitask program execution unit; A microcomputer having a multitasking function for updating and / or outputting the contents of an I / O register being used, and then performing operations and control on the I / O register; Control method of programmable controller.