JPS6350225A - Method for connection between communication networks - Google Patents

Abstract

PURPOSE:To improve the reliability as a communication network by connecting plural node controllers constituting a loop communication network to the same bus communication network to provide a by-pass circuit and presenting the by-pass circuit to the bus communication network even though node controllers are faulty. CONSTITUTION:Four rectangular bus communication networks 10 are provided around a loop communication network 20 having node controllers 1, and two bus communication networks adjacent to each other are connected by a connection part 8, and two other bus communication networks are connected through a repeater 9. Therefore, the communication network 20 uses dual communication networks 10 to perform the loop back operation and reconstitutes the communication network even if the node controller 1 is faulty. The identification number of the faulty controller 1 is simultaneously reported to communication equipments 7 of communication networks 10 from the other normal controllers 1, and thereby, communication equipments 7 continue communication through normal controllers 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a terminal device connected to a bus-like LAN by interconnecting a ring-like local area network (hereinafter referred to as a ring-like LAN) and bus-like LAs. The present invention relates to a method for connecting communication networks to provide a highly reliable transmission path for communication networks.

Conventional technology FIG. 2 shows a conventional communication network configuration method.

In the figure, 1 is a node control device, 2 is a transmission line, 3 is a media attachment unit (hereinafter referred to as MAU), 4 is a transmission line, 5 is a termination circuit, 6 is an MAU cable,
7 is a communication device.

In the above configuration, the transmission line 4 is λ(AU3, MAU cable 6
A bus-like bus connected to the communication device 7 or the node control device 1 via the terminal and terminated with the termination circuit 5 at its end. −
m network 10 is configured. Furthermore, the transmission line 2 is connected in a ring via four node control devices to form a circular communication network 2.
It constitutes 0.

Here, MAU3 is a signal flowing through bus-like transmission line 2 and MAU3.
This is a conversion circuit for signals flowing through the U cable 6, and is generally called a transceiver.

Next, the operation of the above conventional example will be explained. The communication device 7 can freely communicate with another communication device 7 via the bus-like communication network 10 and the circular communication network 20.

In this way, even with the conventional communication network connection method, mutual communication can be performed between two communication devices.

Problems to be Solved by the Invention However, the node control device 1 and path-shaped communication network 10 in the conventional communication network described above are serial systems in terms of reliability engineering, and if the node control device 1 has a failure, the There is a problem in that the connected path-like communication network 10 is disconnected from the ring-like communication network 20 and cannot continue mutual communication with other path-like communication networks 10.

The present invention solves such conventional problems, and even if a node control device fails, it can provide a detour to the path-shaped communication network and improve the reliability of the communication network. The purpose is to realize an excellent connection method between communication networks.

Means for Solving the Problems In order to achieve the above object, the present invention is configured to have a detour by connecting a plurality of node control devices constituting a circular communication network to the same path communication network. It is.

By configuring the present invention as described above, when two sets of communication devices each connected to a path communication network are communicating via a ring communication network, a node control device that performs a relay function goes down. Even if the communication network is connected to the same path-like communication network, another node control device connected to the same path-like communication network can be used as a detour to maintain communication.

Embodiment FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In the figure, four sets of path-like communication networks 10 are provided in a rectangular shape around a ring-shaped communication network 20, two adjacent sets are connected by a connecting part 8, and a repeater 9 is connected between the remaining two sets of υ. It is connected via. The same reference numerals as in other FIG. 2 represent the same names.

Next, the operation of the above embodiment will be explained. In operation, the node control device 1 connected to the same bus-like communication network 10 (including the case where it is extended by the connection unit 8 or repeater 9) or to the path-like communication network 10 to which the communication device 7 belongs
It is also possible to communicate with a communication device 7 connected to another path-like communication network 10 via.

In the latter case, which of the plurality of node control devices 1 on the way is selected can be determined by assigning a designation number to the node control device 1 or by allocating the node control device to be used for each communication device 7 in advance. You can also do it.

If the node control device 1 goes down during such use, the following measures can be taken.

(1) The circular communication network 20 can perform a loopback operation using the duplicated bus communication network 1° to reconfigure the communication network.

(2) All other normal node control devices 1 notify the communication devices 7 of the path communication network 10 of the identification number of the node control device 1 that has gone down. Communication can be continued via.

In this way, according to the above embodiment, by providing a redundant system in which the path communication network 10 and the ring communication network 20 are connected by a plurality of node control devices 1, it is possible to maintain normal operation even if the node control device 1 goes down due to a failure. This has the advantage that communication with communication devices 7 in other bus-like communication networks can be maintained using other node control devices 1.

Effects of the Invention As is clear from the above embodiments, the present invention provides a redundant system in which a path communication network and a ring communication network are connected by a plurality of node control devices, so that even if a node control device goes down due to a failure, This has the advantage that communication between communication devices can be maintained using other normal node control devices.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram of a device applied to a communication network connection method in an embodiment V of the present invention, and Fig. 2 is a block diagram of a device used in a conventional communication network connection method. It is. 1... Node control device, 2... Transmission line, 3... Media attachment unit (MAU), 4...
- Transmission path, 5... Termination circuit, 6... MAU cable, 7... Communication device, 8... Connection section, 9... Repeater, 10... Path-like communication network, 20... Circular communication network. Name of agent: Patent attorney Satoshi Nakao and one other person Figure 1 Figure 2

Claims (1)

[Claims] When a plurality of bus-like communication networks to which communication devices are respectively connected are coupled to a ring communication network having a plurality of node control devices, and mutual communication is performed between the communication devices, the communication between the bus-like communication network and the ring communication network is performed. A detour is formed by connecting the nodes with multiple node control devices, so that even if the node control device in use breaks down, communication is possible through the detour via another normal node control device. Connection method between communication networks.