JPH05289968A - Data transmission processing system - Google Patents

Abstract

PURPOSE:To attain the maintenance of respective processors arranged on a transmission line from one position e.g. in a system for supplying data to the processors by means of a scanning transmission system. CONSTITUTION:A program forming device 16 sets up and updates programs for respective processors 14a to 14d, a program data setting function for setting up program data inputted from the device 16 and specifying a destination to be sent in their own common memories 13a to 13d in their connected states to the device 16 is added to respective transmission control devices 12a to 12d and respective processors 14a to 14d are provided with a program loading function for fetching program data specifying themselves in their storing parts when the program data are stored in common memories 13a to 13d in the control devices 12a to 12d connected to themselves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data processing by connecting a plurality of processors to a transmission line via a transmission control device, and each processor accessing a common memory provided in each transmission control device. Along with
The present invention relates to a data transmission / processing system in which data is transmitted to a common memory in each transmission control device so that the stored contents of the common memories always match.

[0002]

2. Description of the Related Art For example, in a control system for controlling the process state of each facility that constitutes a plant, the amount of data to be handled is required to be large and the data processing speed is required to be high with the development of microelectronics. .. Along with such changes in processing demands, the construction of control systems is also changing from a function concentration method to a function distribution method. Due to the necessity of this function distribution method, the degree of data coupling between system components has also changed from sparse to dense, and it has become a tightly coupled data method.

The tightly-coupled data system is a system in which all the data on the transmission path are shared by the respective transmission control devices (stations), which is called a common memory (common memory) and which is possessed by each transmission control device. The content of the memory is controlled to be the same over all the transmission control devices, which is also called a common memory system scan transmission system. Then, a small processor (microcomputer) such as a program controller (PLC), which is independent from each other, is connected to each transmission control device.

These common memories store, for example, process data (control data) obtained from each facility, which is used when each processor performs a control operation, for example.
That is, each scan type common memory is used for transmission of control data.

However, during the maintenance and inspection period when the plant to be controlled has stopped its operation, each transmission control device connected to the transmission line and having a common memory inside is naturally stopped. .. During such a maintenance / inspection period, each program for control calculation executed by each processor is changed and various data set in the processor for machine adjustment are adjusted. The maintenance of the program is performed by the program creation device directly connected to the processor for each processor at its installation location. FIG. 3 is a block diagram showing a schematic configuration of a data transmission / processing system having the above-mentioned functions.

A plurality of transmission control devices 2a, 2 are provided on the transmission line 1.
b and 2c are connected. Then, each transmission control device 2
a. 2b. 2 c has a common memory 3 of the same configuration in the storage unit.
a, 3b, 3c are formed. Processors 4a, 4b and 4c are connected to the respective transmission control devices 2a, 2b and 2c. Then, each processor 4a, 4b, 4c
In the storage unit of the program memory 5a, 5b, which stores a unique program executed by each processor,
5c is formed.

The transmission control devices 2a to 2c and the processors 4a to 4c are housed, for example, in the same housing, and each device is installed as one device, for example, in each room in which the equipment to be controlled is installed. ing. Therefore, the transmission control devices 2a, 2b, 2c are installed in different rooms or at positions that are considerably separated from each other.

In the data transmission / processing system having such a configuration, each processor 4a. 4b. 4c, according to its own program, the common memories 3a, 3b,
Various data processing is executed while accessing the data of 3c. Therefore, when one processor rewrites part of the data in its own common memory during this access process, the scan transmission function described above operates and the corresponding data in the other common memory is also rewritten to the same value.

Then, during the period when the plant is stopped,
For example, when changing the program of the processor 4a, as shown in FIG. 4, the program creating device 6 is connected to the processor 4a and the program of the program memory 5a of the processor 4a is changed. That is,
Perform program maintenance.

Further, when executing the program maintenance for the other processors 4b and 4c, it is necessary to change the program in the program memory 5a of the processor 4a by connecting the program creating device 6 to the corresponding processor according to the procedure described above. There is.

[0011]

In the data transmission / processing system constructed by such an idea of distributed control,
The processors 4a to 4c to be maintained are distributed and installed in the factory as described above, and the places are separated from each other. For this reason, since the program creation device 6 is connected to or disconnected from each of the processors 4a to 4c, it takes a lot of time and labor to maintain the programs for all the processors 4a to 4c, and further the management of the programs is required. There was also a problem that was complicated.

The present invention has been made in view of the above circumstances, and the program data is the same as normal data for each processor distributed and installed by using the transmission control device adopting the scan transmission system. By transmitting to each common memory by the method, the program required for each processor can be sent from one place, each processor can be remotely maintained from one place, and the maintenance work efficiency and labor saving can be achieved. Data transmission that can
The purpose is to provide a processing system.

[0013]

In order to solve the above problems, the present invention provides a transmission line connected to a transmission line and having a common memory so that the contents stored in each common memory are always the same. A plurality of transmission control devices that perform scan transmission via the transmission control device, and a plurality of processors that are connected to the respective transmission control devices and that access a common memory of the transmission control devices that are connected to each self according to individually set programs. In the equipped data transmission / processing system,

Setting a program in each processor,
A program creating device for changing is provided, and the program data input from this program creating device is set in its own common memory in a state where the program creating device is connected to each transmission control device. In addition to the program data setting function, each processor has a program load function that loads the program data into the storage unit when the program data designating itself is stored in the common memory of the transmission control device connected to the processor. It is attached.

[0015]

According to the data transmission / processing system configured as described above, for example, during the maintenance period of the data transmission / processing system, the program creation device is connected to one transmission control device to create the program. When, for example, a maintenance program is input from the device by designating a destination processor, the transmission deletion device sets the program data in its own common memory like normal data. As a result, the scan function operates and the program data is written in each common memory in all transmission control devices.

When each processor detects that program data destined for itself is stored in the common memory of the transmission control device to which it is connected, each processor program-loads this program data in the storage unit such as its own program memory. To do.

Therefore, by only connecting one program creation device to one transmission control device, maintenance such as setting, changing and deleting of the program of the processor connected to any transmission control device can be performed by remote control. Can be implemented. In addition, since maintenance can be performed from one place, management of program data can be simplified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a schematic configuration of a data transmission / processing system of the embodiment. A plurality of transmission control devices 12a, 12b, 12c, 12d are connected to the transmission line 11. Then, each transmission control device 12a. 12b. 12
In the storage units c and 12d, the common memory 13 having the same configuration is used.
a, 13b, 13c, 13d are formed. The processors 4a, 4b, 4c, 4d are connected to the transmission control devices 12a, 12b, 12c, 12d. Program memories 5a, 5b, 5c, and 5d that store unique programs executed by the processors are formed in the storage units of the processors 4a, 4b, 4c, and 4d.

Each transmission control device and each processor are housed, for example, in the same casing, and each is provided as one device, for example, in a room in which equipment to be controlled is installed. Therefore, each transmission control device 12a, 12
b, 12c, and 12d are installed in different rooms or at positions distant from each other.

Further, the program creating device 16 newly develops each program to be executed by each processor 14a to 14d, or actually operates the program already set in each program memory 15a to 15d of each processor 14a to 14d. It has a program creation / editing function that changes the existing program to change the specifications of the controlled object or improve the program itself, and deletes unnecessary parts of the program.

In addition to the processor input / output port 17 to which the processors 14a to 14d are connected, each transmission control device 12a to 12d is provided with a program creating device 16 or a program data input terminal 18 to be connected. There is. Then, normally, the program data input terminal 18
The program creating device 16 is not connected to.

In the data transmission / processing system having such a configuration, a part of data stored in any one common memory among the common memories 13a to 13d formed in the respective transmission control devices 12a to 12d. Is changed by the access from the corresponding processor 14a to 14d, the scan transmission function is activated, and the same portion of the stored content of the other common memory is rewritten to the same content. Therefore, the contents stored in the common memories 13a to 13d are always kept the same.

Further, each of the transmission control devices 12a-12d has
The common memories 13a to 13d are used for storing normal data in the normal operating state of the system, and the plant is stopped,
For storing program data during inspection and maintenance period 2
A flag is formed in a storage area other than the common memory in order to switch to one application. Then, in a normal state, this flag is [0], and when writing program data, it is set to [1] by the flag data from the program creating device 16. Then, each of the transmission control devices 12a to 12d executes the writing process to the common memories 13a to 13d for the input data according to the flowchart shown in FIG.

That is, the processor input / output port 1
7 or when data is input from the program data input terminal 18 (P1), if the input data is not flag data (P2), the value of the above-mentioned flag is checked (P3).
Even if it is [0], it is judged that the input data is the normal control data from the processor, and the input control data is written in the designated area of the common memories 13a to 13d. Then, it waits for the next data input.

If the input data is flag data, P5
At, the flag is set to [1] or released to {0] in the direction specified by the flag data. In P3, if the flag is [1], the input data is the program data input from the program creating device 16, and therefore the processor 14a of the transmission destination which is also input at the same time.
The input program data is written in the common memory with the destination information designating ~ 14d added. Then, the process returns to P1 and waits for the next data input.

The processors 14a to 14d are connected to the transmission control device 12 according to the programs stored in their own program memories 15a to 15d.
Various data processing is executed while accessing the data of the common memories 13a to 13d of a to 12d.

When the program data addressed to itself is detected in the access process, the program data is written in its own program memories 15a to 15d. That is, the program is loaded. Therefore, as a result, it becomes possible to program-load the program data by designating each of the processors 14a to 14d from the program creating device 16.

In the data transmission / processing system configured as above, when the plant to be controlled is in a normal operating state, the common memories 13a to 13d of the respective transmission control devices 12a to 12d store the control data. The original function of efficiently transmitting data to each processor arranged in a different room or a long distance through each transmission control device 12a to 12d by using a scan method is fulfilled.

Further, when the plant to be controlled is in a stopped state and it is necessary to rewrite, correct, delete, add, etc. the programs of the processors 14a to 13d during the maintenance period in the data transmission / processing system, The program creation device 1 is attached to any of the transmission control devices 12a to 12d.
6 can be connected, and the processors 14a to 14d to be maintained can be designated from the program creating device 16 to perform maintenance by remote control on the programs stored in the program memories 15a to 15d.

In this way, each processor 14a-14d
Since maintenance (inspection and repair) for the program can be executed from one place, the labor of maintenance can be saved and labor can be saved. Further, a large-capacity external storage device is connected to the program creating device 16, and all of the processors 14a to 14 constituting the system of the embodiment are connected to this external storage device.
By storing the program data in d, the program data management can also be simplified.

Originally, in the data transmission / processing system for controlling the process state of the plant, which of the functions in the process control each of the processors 14a to 14d is responsible for data processing is almost uniquely determined. In many cases. However, since the programs can be arbitrarily loaded from the program creating device 16 to the processors 14a to 14d, when a processor fails, it is possible to quickly write the program of the failed processor to another processor. It is expected that the operating rate of the entire plant will improve.

[0033]

As described above, according to the data transmission / processing system of the present invention, the program data can be converted into the normal data by using the transmission control device adopting the scan transmission method for the distributed processors. The same method is used to transmit to each common memory. Therefore, a program required for each processor can be transmitted from one place, remote maintenance can be performed from one place for each processor, and the work efficiency of maintenance work can be improved and labor can be saved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data transmission / processing system according to an embodiment of the present invention,

FIG. 2 is a flowchart showing the operation of the transmission control device in the system of the embodiment;

FIG. 3 is a block diagram showing a schematic configuration of a conventional data transmission / processing system,

FIG. 4 is a diagram for explaining a problem of the conventional system.

[Explanation of symbols]

11 ... Transmission path, 12a-12d ... Transmission control device, 13a
-13d ... Common memory, 14a-14d ... Processor, 1
5a to 15d ... Program memory, 16 ... Program creation device.

Claims (1)

[Claims] 1. A plurality of transmission control devices connected to a transmission line, each having a common memory, and performing scan transmission via the transmission line so that the stored contents of each common memory are always the same; In a data transmission / processing system including a plurality of processors connected to a transmission control device and accessing a common memory of a transmission control device connected to itself according to a individually set program, the program in each processor is A program creating device for setting and changing, and program data provided in each of the transmission control devices, which is connected to the program creating device and which designates a destination, which is input from the program creating device, is common to its own. Program data setting means to be set in the memory, and provided in each of the processors and connected to itself Data transmission and processing system comprising a program loading means for taking in the program data in the storage unit when the program data specified self is stored in the common memory of the transmission control device.