JPH0715437A - Distributed controller - Google Patents

Abstract

PURPOSE:To conduct the processing different from each controlled section at a high speed simultaneously in the distributed controller in which one main control section control plural controlled sections through data communication. CONSTITUTION:A command text transmission means 10 broadcasts a command statement including a header representing simultaneous execution or not and a command to be conducted by each controlled section altogether, a header analysis means 12 analyzes the header and a command recognition means 13 recognizes the command executed by itself and when the header indicates simultaneous execution, a command execution means 15 conducts a command after an execution wait means 14 awaits the end of the reception of the command statement. Thus, the processing is fast because the command is simultaneously transmitted in a broadcast way and commands to each controlled section are integrated into the command statement simultaneously through execution wait to conduct different processing to each controlled section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed control device, and more particularly to a distributed control device in which one main control unit controls a plurality of controlled units by data communication.

[0002]

2. Description of the Related Art Conventionally, a distributed control device of this type uses a plurality of modules (controlled parts) for performing partial processing in order to perform large-scale processing or complicated processing, and uses them as one central control. Distributed processing is performed by controlling with a module (main control unit).

In such a distributed control device, it is necessary to control a plurality of controlled parts simultaneously or at high speed in processes such as protection switching when a failure occurs and suppression of notification of a dependent failure. is there.

FIG. 4 is a flow chart for controlling a plurality of controlled parts simultaneously. It is assumed that one main control unit controls N controlled units i (i = 1 to N).

The main control section transmits the command i to the controlled section i (step S41), the controlled section i receives it (step S42), and transmits the acceptance as a response (step S43). The main controller receives it (step S44). This is repeated for N controlled parts. The controlled unit i waits for a trigger to execute commands simultaneously (step S46).

The main control unit transmits an execution trigger by broadcasting to all controlled units (step S4).
5). Receiving it, each controlled part i releases the execution trigger wait and executes the command (step S26). As a result of command execution, each controlled part i transmits the result (step S27), and the main control part receives it (step S28) to end the series of processes.

FIG. 5 is a flowchart for controlling a plurality of controlled parts at high speed.

In this case, the main control unit transmits the command by broadcast to all the controlled units i (step S51), and each controlled unit i receives the command (step S52). Execute the command (step S2
6) The result is transmitted (step S27). The main control unit receives the result (step S28).

[0009]

In this conventional distributed control device, in the case of simultaneous control, high-speed processing cannot be performed because transmission and reception are performed with a plurality of controlled parts, respectively.
In the case of high-speed control, there is a problem that the processing cannot be synchronized and simultaneous control cannot be performed.

Further, since only the same command can be sent to all controlled units, there is a problem that it cannot be used when different processing is required for each controlled unit.

An object of the present invention is to provide a distributed control device that solves the above problems.

[0012]

SUMMARY OF THE INVENTION According to the present invention, one main control unit having a command transmitting unit for controlling a plurality of controlled units and a receiving unit for receiving the execution result thereof, and a main control unit for receiving a command. In a distributed control device comprising a plurality of controlled units each having a receiving unit, an executing unit for executing the command, and a transmitting unit for transmitting the execution result, the command transmitting unit is A command message sending means for sending a command message for sending simultaneously and different commands to a plurality of controlled parts by broadcast, wherein each controlled part analyzes the header in the command message, and a command analyzing means, Command recognition means to recognize the command to yourself in the message,
It is further characterized by further comprising execution waiting means for simultaneous execution.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. This distributed control device has one main control unit 1 and N
Controlled parts 2 (only i-th controlled part is shown in the figure)
Composed of and.

The main control unit 1 includes a command message transmission means 10
And a receiving means 17.

The controlled unit (i) 2 also includes a receiving means 11 for receiving a command message, a header analyzing means 12 for analyzing a header in the command message, and a command i recognizing means 13 for recognizing a command. Execution waiting means 14 for synchronizing execution in the case of execution, and command i execution means 1
5, the transmission means 16 for transmitting the execution result of the command.

Next, the operation of this embodiment will be described.
FIG. 2 is a flow chart for explaining the operation of this embodiment. FIG. 3 shows the structure of the command message.

The main control unit 1 includes N controlled parts i (i = 1 to 1).
N) The command message 3 is transmitted in a batch to 2 (step S20).

Here, the command message 3 is, as shown in FIG. 3, a simultaneous execution flag 3 indicating whether or not the control is simultaneous execution.
Header 30 including 2 and each controlled part i (i = 1 to N)
Of each command i (i = 1 to N).

Each controlled unit (i) 2 starts receiving the command message 3 (step S21). Header analysis means 12
Reads the header 30 of the command message 3 and analyzes the content of the simultaneous execution flag (step S22).

The command i recognizing means 13 uses the command i
(I = 1 to N) is read and the command i for itself is recognized (step S23). Here, command message 3
As a method of recognizing the command i, there is a method in which the length of each command i is set to a fixed value (fixed length method), or a delimiter is added to the end of each command i (variable length method). .

From the result of the header analysis (step S22), the command i recognizing means 13 judges whether or not the simultaneous execution is performed (step S24). If the simultaneous execution is performed, the execution waiting means 14 enters the execution waiting state (step S25). ), Otherwise, the command i executing means 15 executes the command (step S26).

The timing for performing the simultaneous execution is the command i
The recognition means 13 recognizes the end of reception of the command message 3 (step S25), and the command i execution means 15 automatically executes the command after the end of reception (step S2).
6). After that, the transmitting unit 16 transmits the result of command execution (step S27), and the receiving unit 17 of the main control unit 1
Receives it (step S28) and ends the series of processes.

[0024]

As described above, the distributed control apparatus of the present invention broadcasts a command message in which a command for each controlled unit is grouped, and executes the command at the timing when the transmission ends. High-speed control and simultaneous control are possible, and there is an effect that different processing can be performed for each controlled unit.

Since the command message is accompanied by the information indicating whether or not the simultaneous control is performed, it is possible to perform the control without the conventional simultaneous control.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment shown in FIG.

FIG. 3 is a format of a command message in the embodiment shown in FIG.

FIG. 4 is a flowchart showing an operation of a conventional example in the case of simultaneous control.

FIG. 5 is a flowchart showing an operation of a conventional example in the case of high speed control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 main control part 2 controlled part 10 command message transmission means 11 receiving means 12 header analysis means 13 command i recognition means 14 execution waiting means 15 command i execution means 16 transmission means 17 reception means

Claims (2)

[Claims] 1. A main control unit having a command transmitting unit for controlling a plurality of controlled units and a receiving unit for receiving the execution result, a receiving unit for receiving the command, and executing the command. In the distributed control device comprising a plurality of controlled units each having an executing unit for transmitting the execution result and a transmitting unit for transmitting the execution result, the command transmitting unit is configured to simultaneously control the plurality of controlled units and It is a command message sending means for sending a command message for sending a different command by broadcasting, wherein each of the controlled parts is a header analyzing means for analyzing a header in the command message and a command for the self in the command message. A distributed control device further comprising command recognition means for recognition and execution waiting means for simultaneous execution. 2. The distributed control device according to claim 1, wherein the command message has a header including a concurrency flag indicating whether or not the control is concurrency control.