JPS62287740A - Path controller for data communication network - Google Patents

Abstract

PURPOSE:To relieve the load of a central processing unit by sending a redundancy bit discriminating the high-order direction and the low-order direction to a communication line between controllers in a data communication network. CONSTITUTION:Controllers 2-6 take either one of channels 7-12 connected to itself as a high-order direction and other channels 7-12 are taken as a low-order direction. The controllers 2-6 send the data from the high-order direction in a direction receiving a redundant bit '1' from the opposite controller in the low-order directions. In case of the data from the low-order direction, the controllers 2-6 fetch the data only from the channels 8-12 receiving the redundant bit '1' and send the result in the high-order direction. Through the operation above, a communication path decided definitely is set between a central processing unit 1 and the controllers 2-6. Thus, the load of the unit 1 is relieved.

Description

Detailed Description of the Invention] 8. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a data communication network in which each data communication path between a central processing unit and a target control unit is The present invention relates to a route control device established between control devices.

[Conventional technology]

Conventionally, in this type of data communication network, a central processing unit sends route selection information to each control device, and based on that information, each control device sends data to the next control device. It was sending out in the desired direction.

[Problem that the invention seeks to solve]

In the conventional method described above, the central processing unit manages the state of the data communication network and has to notify each control device in advance to establish a relay transmission path to the target control device. This has the disadvantage that the load on the processing device increases.

In the present invention, each control device determines the data transfer direction and transfers the data by sending redundant data bits to the communication path between the control devices, so that the central processing unit can intervene in the path leading to the target control device. This provides a mechanism for setting the .

[Means for solving problems]

The route control device of the present invention has a data central processing unit, and has a plurality of communication paths connected to the central processing unit to form a network, and is further provided at each junction point of the communication paths and connected to the data central processing unit. In a data communication network having a plurality of control devices that control the direction of data flow, means for transmitting redundant bits for distinguishing between an upper direction and a lower direction to each of the communication paths connected to each of the control devices; The present invention is characterized in that it includes means for detecting the transmitted redundant bits, which are disposed in each of the control devices.

Therefore, the redundant bits that distinguish between the upper direction and the lower direction allow each control device to independently control the direction of data flow.

〔Example〕

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

FIG. 1 is a block diagram illustrating an embodiment of the present invention, in which a central processing unit 1 inputs and processes data, and outputs data as a result of the processing.

The first communication path 7 inputs and outputs data to and from the central processing unit 1 . First control device! 2 is the first. Second and third communication channels? , 8.9 controls the input and output of data, that is, the flow of data. Similarly, 3゜4.5.6H respectively second
, 4th Nara (Ic 5th control device, 10.11.12 is the 4th, 5th and 6th control device, respectively)
It is a communication channel for

Central processing unit [1, control device 2-6. Rabini communication channel 7~
12 constitutes a data communication network, and data communication is carried out between the central processing unit 1 and the control bag! Between any one of groups 2 to 6,
This is carried out using one or more of the communication channels 7 to 1z. Note that the communication channels 7 to 12 are transmission channels that can perform bidirectional communication at the same time.

Each control device 2 to 6 uses one of the communication paths 7 to 2 connected to itself as the upper direction, and the other communication paths 7 to 1
2 is the lower direction. In addition, it is connected to the central processing unit 1.
The control unit W2 has the central processing unit 1 as its upper level and the other control units 3.4 as its lower level. That is, the central processing unit 1 is considered to be the highest level.

As shown in the figure, each control device sends the redundant bit as 1" in the upper direction and as 0 in the lower direction. If the redundant bit is sent from the control device in the upper direction as @1", ”, the redundant bit @Om
Search for another communication channel through which the ``transmittance'' is sent, and set it as the upper direction, and set the others as the lower direction.

For example, in the l@1 diagram, if the control device 4 assumes that the communication path 11 is in the upper direction, the redundant bit is sent from the control device 5 as "1m", so other communications where the redundant bit is "0" In this case, the communication path 9 is switched to the upper direction.

Each of the control devices 2 to 6 sends data from the upper direction toward the lower direction in which the redundant bits 112 are sent from the control device on the other side. For example, the control device 4 sends data from the communication path 9 only to the communication paths 11 and 12,
Communication channel 10 ('C is not sent.

On the other hand, in the case of data from the lower direction, each control device 2 to 6
The control device 4 takes in data only from communication channels 8 to 12 through which redundant bits 11'' are sent and sends it to the upper level.For example, the control device 4 transfers only data from communication paths 11 and 12 to the upper level, data will not be transferred.

These operations cause the central processing unit 1 and each control unit 2 to
6, a communication path determined at will is set.

Therefore, the central processing unit 1 only adds address information of the target control devices 2 to 6 to the data to be transmitted, and does not need to add route information.

In other words, in the above-described embodiment, the central processing It is characterized by establishing a transmission path from the device to the target control device.

〔Effect of the invention〕

As explained above, in a data communication network, the present invention transmits redundant bits that distinguish upper direction and lower direction on the communication path between each control device, thereby allowing the central processing unit to Since it is possible to establish a transmission path from to the target control device, it has the effect of reducing the burden on the central processing unit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating one embodiment of the present invention. 1... Central processing unit, 2-6... Control device, 7-1
2... Communication channel.

Claims (1)

[Scope of Claims] It has a central processing unit for data and a plurality of communication channels connected to the central processing unit to form a network, and is further provided at each junction of the communication channels to allow the flow of the data. In a data communication network having a plurality of control devices that control directions, means for transmitting redundant bits for distinguishing between an upper direction and a lower direction to each of the communication paths connected to each of the control devices, and each of the control devices. A route control device for a data communication network, comprising: means for detecting the transmitted redundant bits, which is disposed in the device.