JPS60169252A - Network managing system - Google Patents

Abstract

PURPOSE:To prevent the utilizing efficiency of a network from being decreased by storing respectively the newest state of all communication equipments connected to the network to each communication equipment. CONSTITUTION:All the communication equipments 1-n transmit network managing information at each prescribed time in terms of simultaneous multiple address. When information for disconnecting a terminal device 1a to which the communication equipment 1 is connected for example is transmitted and the communication equipments 2-n at the reception side receive it via a communication line 10, the communication equipment 2-n at the reception side discriminates an identification code of a control field of a packet received via the communication line 10 as a network managing code, the network managing information reception processing different from the processing at the normal data reception is executed, and only the network managing information of the communication equipment 1 being the sender is revised out of the network managing information of the other communication equipments than the own communication equipment stored in the communication equipments 2-n.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a communication device (communication control device) accommodating a terminal device.
It is related to the bus structure network consisting of mutual kg by means of a communication cycle.

[Prior art]

In a conventional bus network, it is impossible for other communication devices to recognize the status of communication devices interconnected via communication lines. Recognizes the status of the communication device. However, in such a network, there is a time when the communication line is occupied by unnecessary data transmission, which inevitably reduces the efficiency of network usage.

[Purpose of the invention]

An object of the present invention is to provide a network management method that prevents a decrease in network usage efficiency by allowing each communication device to maintain the latest status of all communication devices connected to the network.

[Invention mold]

In the network management system according to the present invention, all communication devices interconnected through communication lines broadcast the status of their own communication devices to other communication devices at regular intervals, and each communication device on the receiving side sends a message. A special feature characterized in that status information of the original communication device is updated and held every time it is received [Description of Embodiments] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a packet format when transmitting network management information in the present invention, including a broadcast destination address P1, a source address P2, and a control field P3 in which a network management packet identification code is set. , network management information data P4.

FIG. 2 is a diagram showing the numbers of bus structure networks.

In the figure, the above-mentioned network management information is transmitted by the general communication device at regular intervals, for example, from the red light device 1.
When transmitting disconnection information for the terminal device 1a that is connected to If it is determined that this is the case, network management information reception processing that is different from the processing when receiving normal data is executed to perform network management of other communication devices other than the own communication device held in the communication devices 2 to n. Of the information, only the network management information of the transmitting source, Doukaki'1, is updated.

Thereafter, the terminal devices 2a- connected to the communication devices 2 to n
If an attempt is made to send data from -na to the terminal h1a plugged into the communication device 1, the latest network management information held by the communication devices 2 to n will cause the terminal device 1a to connect to the communication device 1. Since the communication devices 2-n can recognize that they are separated from each other, they do not send data to the network, and the terminal devices t2a-naK terminal device 1a
Notifies the disconnection status of the

〔Effect of the invention〕

b. As explained above, according to the present invention, since unnecessary data is not sent to the communication line interconnecting communication devices, it is possible to improve the usage efficiency of the network.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a packet format for transmitting network management information in one embodiment of the present invention, and FIG. 2 is a diagram showing an example of the construction of a bus structure network in one embodiment of the present invention. 1~rl... Communication device, 1a-na...
・Terminal device, 10... Passage times &! 1゜First area

Claims (1)

[Claims] In a bus network in which multiple communication devices that accommodate terminal devices are interconnected via communication lines, the status of its own communication device is broadcasted to other communication devices at regular intervals, and each receiving communication device A network management method characterized by updating and retaining the status of a source communication device each time it is received.