JPH0757036B2 - Distributed control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a distributed control system that executes control operations for various processes, and in particular, alarm information exchanged between a control station and an operator station,
This is to improve the transfer method of message information and the like.

<Prior Art> FIG. 5 shows an example of the configuration of a general distributed control system.

In this figure, the control stations 11 to 1n are installed in various processes and are monitored and managed by the operator stations 31 to 3m via the communication line 2.

That is, the operator stations 31 to 3m are man-machine
It functions as an interface and at each station, alarm information from the control stations 11-1n,
Operation guidance or the like for the control stations 11 to 1n is displayed, and the operator can monitor and manage the process by operating the control stations 11 to 1n based on the display information.

<Problems to be Solved by the Invention> By the way, a large number of devices which are not automated in process control are installed, and these devices are operated manually by an operator.

Then, conventionally, for various alarm information from the control stations 11 to 1n side, this alarm information is displayed on the CRT display device of the operator station or the like and transmitted to the operator. Turn on / off the switch etc. to operate the corresponding alarm processing.

However, on / off of the confirmation switch is merely an operation on the operator station side, and the function of transmitting the confirmation of the alarm from the operator station side to the control station side has not been added.

Furthermore, if a reply signal is sent to the operator station side, multiple CRT display devices may be installed in each of the operator stations 31 to 3m, and which CRT display device of which operator station It was not clear whether the alarm confirmation should be returned, and when the alarm confirmations were returned from multiple operator stations, the control station could not recognize this.

As described above, there is a problem in that the exchange of messages between the control station and the operator station is insufficient.

An object of the present invention is to solve such a problem and an object thereof is to increase the amount of messages transmitted and received between a control station and an operator station to realize efficient process control.

<Means for Solving the Problems> According to the present invention, which has solved the above problems, at least one control station that executes a control operation for various processes, and one or more control stations via a communication line are provided. In a distributed control system consisting of at least one operator station for monitoring and managing, said control station is a dialog number specifying a message type and whether this dialog number is a data entry type or a confirmation operation type. Is transmitted, the operator station receives the communication frame and displays it according to the dialog number, and when the dialog number is a data entry type, numerical data is displayed. A confirmation message is sent when the dialog number is set and the confirmation operation type is set. The distributed control system is characterized by transmitting a communication frame in which a number is set.

<Operation> The distributed control system of the present invention operates as follows.

When an alarm occurs at the control station, a dialog frame corresponding to this alarm and a communication frame for setting the type of this dialog number are sent, and the operator station receiving this communication frame sends an alarm confirmation signal or numerical data. It is sent as a communication frame to the operator station and the control station.

<Embodiment> The distributed control system of the present invention has the same overall configuration as the system configuration shown in FIG. 5, but is characterized by the operation sequence of the control station and operator station in such a system.

FIG. 1 is a flow chart showing the operation of the distributed control system of the present invention.

The operation of the control station and the operator station in the system of the present invention will be described in detail according to this flow.

When the user program running on the control station installed in the process sends a message such as an operation request or alarm output to the operator station, the control station uses the dialog number corresponding to this message type. The communication frame marked with is sent to the communication line.

The structure of this communication frame is as shown in FIG.

This frame consists of 256 bytes, for example
D, the unit number of the sending control station,
Communication information that specifies the dialog number corresponding to the type of message output by the unit, the option part, the total number of frames to communicate, the frame sequence number, and data attributes such as whether the data to be communicated is character or binary. , The number of data bytes, and data (the contents of this data differ depending on the specification of the option part).

A major feature of the present invention is that dialog numbers corresponding to various messages transmitted to the operator station are added to the frame.

Then, the format of the message designated by this dialog number is set in the option section.

FIG. 2 (b) is a diagram showing the bit structure of the option part (2 bytes).

That is, the fifth bit "1" indicates that there is a dialog name, and the fourth bit "0" indicates that the message corresponding to the dialog number is Y / N from the operator station.
"1" represents the value for which confirmation information such as information is expected, and "1" represents the value for which the message corresponding to this dialog number expects numerical data from the operator station.

In the first bit, "1" indicates that the display character string or display symbol string of the message corresponding to the dialog number is in the data of this frame (dialog data), and "0" corresponds to the dialog number. Specifies that the display character string or display symbol string of the message is on the operator station side (data is the operation guide number).

In addition, various items are set as bit information in the option section.

Now, returning to the flow of FIG. 1, each operator station that has received the above communication frame displays a message corresponding to this dialog number on the CRT display screen, and performs processing such as printer output.

The operator who confirms this message display performs a corresponding confirmation process via a keyboard or the like.

Then, from the operator station, the operation information of the operator is put on a communication frame and transmitted to the communication line.

The structure of the communication frame from the operator station side is shown in FIG.

In this frame, the installation number of the control station to be sent to the destination STN.NO in the 4th word is set, and Y / N is set in the data.
Confirmation information or numerical data is set.

In addition, the frame ID, unit number in the destination control station UNIT.NO, the dialog number, reply data,
The number of bytes, various reply statuses, reply information, etc. are set.

Returning to the flow chart of FIG. 1 again, when the communication frame as shown in FIG. 3 sent out on the communication line is received by the other unit in the control station, the control station sends this reply data to the internal user program. Is input, a predetermined process is executed, and subsequent input of a reply signal is prohibited.

On the other hand, the communication frame sent from the operator station is received by all the operator stations on the communication line, and the fact that the confirmation process for the message from the control station is completed is output to the CRT display device or a printer. To do.

Therefore, the same confirmation processing is prevented from being performed on another operator station, and even if the same confirmation processing is erroneously performed, the control station side does not accept this.

Further, a reply signal indicating that the communication frame has been received from the operator station may be returned from the control station side.

Next, an example of display on the CRT display device at the operator station is shown in FIG. 4, and an example of operation of the system of the present invention will be described with reference to this.

According to the dialog number in the communication frame sent from the control station, the CRT of the operator station
The display device displays the following message on the CRT display device: "1. Catalyst input 2. Quick cooling 3. Insulation 10 minutes 4. Reloading of raw material".

If the operator selects one of the values 1 to 4, for example, the numerical value "4", the operator station sends a frame carrying numerical data corresponding to "4" to the communication line.

The control station that receives this frame
The program is notified of the numerical value "4", and subsequently, the dialog number corresponding to the message to be transmitted next is put in a frame and transmitted.

According to this new dialog number, the operator station will display "Add additive (Y / N)?".

At this time, the operator station returns a communication frame carrying a Y / N confirmation signal to the control station side according to the operator's operation, and the control station continues the control operation according to the confirmation signal.

Similarly, Y / N confirmation information is also returned to the control station side with respect to the message “Can I lower the temperature (Y / N)?” From the control station.

Then, according to the dialog number returned from the control station, when the message “Enter amount of drug” is displayed on the operator station, this message requests numerical data instead of Y / N confirmation information. At this time, not the confirmation information but the arbitrary numerical data input by the operator is put on the frame and transmitted to the control station.

Similarly, a message is displayed on the operator station according to the dialog number in the frame returned from the control station, and the operator sends input operation information such as confirmation information and numerical data to the control station according to this message. And interactively exchange information with the control station.

<Effects of the Invention> As described above, according to the distributed control system of the present invention, the exchange of messages between the control station and the operator station is realized in an interactive manner, which is sufficient. It is not necessary to provide an on / off confirmation switch for messages, etc., and it is possible to reply not only on / off binary information but also numerical data.
It is also possible to change the sequence processing to be performed next on the control station side.

Further, since the communication frame sent from the operator station reaches all the operator stations in the system, the same operation is prevented from being repeated twice, and any operator station can reply to the control station. it can.

[Brief description of drawings]

FIG. 1 is a flow showing the operation of the distributed control system of the present invention, and FIGS. 2 (a) and 2 (b) are configuration diagrams of a communication frame sent from a control station and its option part in the system of the present invention. FIG. 4 is a configuration diagram of a communication frame transmitted from an operator station in the system of the present invention, FIG. 4 is a display example of a CRT display device of the operator station of the system of the present invention, and FIG. 5 is a general distributed control system. It is a whole block diagram. 11 to 1n ... Control station, 2 ... communication line, 31 to 3m ... Operator station.

Claims (1)

[Claims] 1. At least one control station for executing control operations for various processes, and at least one operator station for monitoring and managing the one or more control stations via a communication line. In the distributed control system configured, the control station sends out a communication frame in which a dialog number for specifying a message type and bit information indicating whether the dialog number is a data entry type or a confirmation operation type are set, The operator station receives the communication frame and displays it according to this dialog number, and when the dialog number is a data entry type, numerical data is set, and when the dialog number is a confirmation operation type, a confirmation signal. Characterized by transmitting a communication frame in which is set Distributed control system.