JP2001148708A - Network management system and recording medium with recorded network management program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily specify the cause of a fault, to decrease the capacity of a communication data storage of each controlled device, and to handle faults which occurs successively. SOLUTION: When a fault detection part 10 detects a fault occurring to an external communication device 13, a 2nd control part 12 of a controlled device 2 is informed of the fault occurrence by the fault detection part 10 and sends fault information to a 1st control part 7 of a control device 1 through a 2nd transmission and reception part 11 and a 1st transmission and reception part 4. A 1st control part 7 of the control device 1 stores the fault information in a fault information storage part 5, reads a communication data history at the time of the fault out of a communication data storage part 14 of the controlled device 2, and stores it in a fault communication data storage part 16 while relating it to the previously reported fault information and also outputs the fault information to an external device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network management system and a recording medium on which a network management program is recorded, and more particularly, to a group including a control device and a plurality of controlled devices controlled and managed by the control device. The present invention relates to a network management system applied to a terminal device and a recording medium storing a network management program.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram for explaining a configuration of a network management system of a first conventional example. FIG.
As shown in FIG. 1, the network management system of Conventional Example 1 includes a control device 1 and a plurality of controlled devices 2 controlled and managed by the control device 1.
Control device 1 and controlled device 2 in one rack (shelf)
(Package) is stored as a collective communication device. The controlled device 2 is various communication devices such as a modem, a terminal adapter, a multiplexing device, and an optical communication device. The control device 1 and each controlled device 2 are connected by a communication cable 3 such as a wiring disposed on a backboard, for example.

The control device 1 has a first transmitting / receiving unit 4, a fault information storage unit 5, an interface unit 6, and a first control unit 7. The first transmitting and receiving unit 4 transmits and receives various information such as control information and fault information to and from the controlled device 2. The failure information storage unit 5 stores the failure information sent via the first transmission / reception unit 4. The interface unit 6
The external device 8 is connected to the external device 8 for inputting and outputting various types of information. Here, the external device 8 includes, for example, a keyboard, a numeric keypad, a mouse, and an input medium (for example, F
D, MO) and output devices such as a CRT, a liquid crystal display, and a printer. The first control unit 7 controls the first transmission / reception unit 4, the failure information storage unit 5, and the interface unit 6.

[0004] The controlled device 2 includes a communication unit 9, a failure detection unit 10, a second transmission / reception unit 11, and a second control unit 12. The communication unit 9 is connected to the external communication device 13 to perform communication with the external communication device 13. The failure detection unit 10 monitors a communication state between the communication unit 9 and the external communication device 13. The second transmission / reception unit 11 transmits / receives various information such as control information and failure information to / from the first transmission / reception unit 4 of the control device 1. The second control unit 12 includes a communication unit 9,
It controls the failure detection unit 10 and the second transmission / reception unit 11.

The second control unit 12 of the controlled device 2 causes the failure detection unit 10 to monitor the communication state between the communication unit 9 and the external communication device 13, and the failure detection unit 10 detects that a failure has occurred. In this case, a failure occurrence notification is received from the failure detection unit 10. The second control unit 12 that has received the notification of the occurrence of the failure transmits the control device 1 via the second transmission / reception unit 11 and the first transmission / reception unit 4.
To the first control unit 7, the failure information relating to the failure such as the address number of the controlled device 2 in which the failure has occurred, the type of the failure, and the failure occurrence time.

[0006] The first control unit 7 of the control device causes the fault information storage unit 5 to store the fault information sent from the controlled device 2. The first control unit 7 also controls the controlled device 2 by transmitting various control information input from the external device 8 via the interface unit 6 to the controlled device 2 via the first transmitting / receiving unit 4. Alternatively, various information notified from the controlled device 2 is output to the external device 8 via the interface unit 6 and presented to the administrator.

[0007] An administrator who knows the fact of occurrence of a failure through the interface unit 6 of the control device 1 or other means (for example, an alarm display lamp of the controlled device 2, an alarm alarm, a communication from the external communication device 13). The first control unit 7 stores the fault information such as the address number of the controlled device 2 in which the fault has occurred, the type of the fault, and the fault occurrence time from the fault information storage unit 5 through the interface unit 6 by the first control unit 7.
To output detailed trouble information.

FIG. 8 is a block diagram for explaining the configuration of the network management system of the second conventional example. As shown in FIG. 8, in the network management system of the second conventional example, the control device 1 has the same configuration as the network management system of the first conventional example, but each controlled device 2 has a communication unit 9 and an external device. It further includes a communication data storage unit 14 that stores a history of communication data with the communication device 13.

Japanese Patent Application Laid-Open No. 7-74799 discloses that
A network management system that outputs fault information matching an automatic output condition registration table in real time is disclosed. Also, Japanese Patent Application Laid-Open No. 9-6571 discloses a network management system in which a fault display mark is output on a network layout screen of a display device so that a fault location can be easily confirmed.
Japanese Patent Application Laid-Open No. 10-13536 discloses a network management system in which a database for storing fault information is provided for each user connected to a network, and fault information is stored for each user.

[0010]

The network management system of the first prior art has the following problems.

(1) When a failure occurs due to a particular combination of transmission / reception data or unexpected transmission / reception of data, it is difficult to identify the cause of the failure, even if the failure can be detected.

(2) In order to identify the cause of the failure, it is necessary to carry out a reproducibility test of the failure generation procedure using a communication analyzer 15 (see FIG. 7) such as a protocol analyzer. Time is spent.

The network management system of the second conventional example has the following problems.

(3) Each controlled device 2 is provided with a communication data storage unit 14. However, simply leaving a history of communication data does not relate to the occurrence of a failure. It takes time and effort. Further, it is conceivable to add a time stamp to both data, and then collate the histories of the administrators. However, it is necessary to always manage the time coincidence between the devices, and furthermore, it is necessary to manage the time per communication data. The cost is increased due to an increase in the amount of data.

(4) Since the capacity of the communication data storage unit 14 is limited, there is a possibility that communication data at the time of occurrence of a failure may not be held (overwritten). Even if the size is large, the cost is high, and the amount of communication data is enormous, so that it is more difficult to analyze the data against the failure history.

(5) In order to hold communication data at the time of occurrence of a failure, a method of stopping writing to the communication data storage unit 14 simultaneously with the occurrence of the failure may be considered. You can't do that. Therefore, it is difficult to cope with a plurality of consecutive failures.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to quickly identify the cause of a failure, to reduce the capacity of a communication data storage unit of each controlled device, and It is an object of the present invention to provide a network management system and a recording medium which can cope with the continuous occurrence of a failure.

[0018]

According to the present invention, there is provided a network management system comprising a control device and a plurality of controlled devices controlled by the control device. A first transmission / reception unit for transmitting / receiving various information such as control information and failure information to / from the apparatus, a failure information storage unit for storing failure information transmitted via the first transmission / reception unit, A failure communication data storage unit for storing communication data history, an interface unit connected to the external device for inputting / outputting various information with the external device, the first transmission / reception unit, the failure information storage unit, A failure control data storage unit and a first control unit that controls an interface unit, wherein the controlled device is connected to an external communication device to perform communication with the external communication device. A communication unit, a failure detection unit that monitors a communication state between the communication unit and an external communication device, a communication data storage unit that stores a communication data history between the communication unit and the external communication device, and the control unit. A second unit for transmitting and receiving various information such as control information and fault information to and from a first transmitting and receiving unit of the device;
Having a communication unit, a failure detection unit, a communication data storage unit and a second control unit for controlling the second transmission and reception unit,
The second control unit of the controlled device causes the failure detection unit to monitor the communication state between the communication unit and the external communication device, and when the failure detection unit detects the occurrence of the failure, the failure detection unit Upon receiving the occurrence notification, the failure information is sent to the first control unit of the control device via the second transmission / reception unit and the first transmission / reception unit, and the first control unit of the control device transmits the failure information regarding the failure that has occurred. While storing the fault information in the fault information storage unit,
Reading a communication data history at the time of a failure from the communication data storage unit of the controlled device, associating the communication data history with the failure information and storing the communication data history in the failure communication data storage unit, The fault information stored in the fault communication data storage unit and the communication data history at the time of the fault associated therewith are output to an external device via the interface unit.

It is preferable that the failure information storage unit and the failure communication data storage unit store the failure information and the communication data history at the time of the failure in association with each other by assigning an identifier.

When the communication data storage section of the controlled device exceeds a predetermined storage capacity, it is preferable to delete the oldest communication data history first.

It is preferable that the communication data storage section of the controlled device stores the communication data history even after the failure detection section detects the occurrence of the failure.

[0022] For each of the controlled devices, there may be provided a read size designation unit for designating the size of the communication data history read from the communication data storage unit and stored in the fault communication data storage unit of the control device. Good.

It is preferable that the size of the communication data history designated by the read size designation unit can be changed to a desired value via the interface unit of the control device.

[0024] The recording medium of the present invention is a network management system comprising a control device and a plurality of controlled devices controlled by the control device.
A first transmission / reception unit that transmits / receives various information such as control information and failure information to and from the controlled device, a failure information storage unit that stores failure information transmitted via the first transmission / reception unit, A failure communication data storage unit for storing a communication data history at the time of failure; an interface unit connected to the external device for inputting / outputting various information with the external device; the first transmission / reception unit; A control unit that controls a storage unit, a fault communication data storage unit, and an interface unit, wherein the controlled device is connected to an external communication device to perform communication with the external communication device. Unit, a failure detection unit that monitors a communication state between the communication unit and an external communication device, a communication data storage unit that stores a communication data history between the communication unit and the external communication device, and the control device With the first transceiver A second transmission / reception unit for transmitting and receiving various information such as control information and failure information, and a second control unit for controlling a communication unit, a failure detection unit, a communication data storage unit, and a second transmission / reception unit. A recording medium on which a program for controlling a network management process by a computer by a management system is recorded, wherein a failure is detected in a communication state between a communication unit and an external communication device by a failure detection unit of the controlled device. In this case, the process of storing the fault information sent from the controlled device in the fault information storage unit of the control device, and reading the communication data history at the time of the fault from the communication data storage unit of the controlled device, A process of associating a history with the fault information and storing the history in the fault communication data storage unit; and a process of storing the fault information storage unit and the fault communication data storage unit A process for causing a computer to execute the process of outputting the stored fault information and the communication data history at the time of the fault associated therewith to an external device via an interface unit, and recording a program for causing a computer to execute the process. is there.

The recording medium of the present invention also reads out communication data histories of the size specified by the read size specification section provided for each of the controlled devices and stores the communication data history in the fault communication data storage section of the control device. A program for causing a computer to execute a process or a process of changing the size of the communication data history designated by the read size designation unit to a desired value may be recorded.

According to the present invention, when a communication failure occurs in the controlled device, the failure information and the communication data history associated therewith can be output from the external device and presented to the administrator.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining the configuration of the first embodiment of the present invention.

As shown in FIG. 1, the network management system according to the embodiment of the present invention includes a control device 1 and a plurality of controlled devices 2 controlled and managed by the control device 1. For example, one rack (shelf)
1 is configured as a collective communication device in which the control device 1 and the controlled device 2 (package) are stored. The controlled device 2 is various communication devices such as a modem, a terminal adapter, a multiplexing device, and an optical communication device. Control device 1
And each controlled device 2 are connected by a communication cable 3 such as a wiring arranged on a backboard, for example.

The control device 1 has a first transmission / reception unit 4, a failure information storage unit 5, an interface unit 6, a failure communication data storage unit 16, and a first control unit 7. The first transmitting and receiving unit 4 transmits and receives various information such as control information and fault information to and from the controlled device 2. The failure information storage unit 5
The failure information transmitted via the first transmission / reception unit 4 is stored. The interface unit 6 is connected to the external device 8 for inputting and outputting various types of information to and from the external device 8. Here, the external device 8 is, for example, a keyboard, a numeric keypad,
Input devices such as a mouse and an input medium (for example, FD and MO), output devices such as a CRT, a liquid crystal display, and a printer. The failure communication data storage unit 16 stores a communication data history at the time of failure. The first control unit 7 controls the first transmission / reception unit 4, the failure information storage unit 5, the failure communication data storage unit 16, and the interface unit 6.

The controlled device 2 includes a communication unit 9, a failure detection unit 10, a second transmission / reception unit 11, and a communication data storage unit 14.
And a second control unit 12. The communication unit 9 is configured to communicate with the external communication device 13.
Connected to The failure detection unit 10 monitors a communication state between the communication unit 9 and the external communication device 13. The second transmission / reception unit 11 transmits / receives various information such as control information and failure information to / from the first transmission / reception unit 4 of the control device 1. The communication data storage unit 14 stores a history of communication data between the communication unit 9 and the external communication device 13. Communication data storage unit 14
When a predetermined storage capacity is exceeded, the oldest communication data history is removed first, the latest communication data history is always stored, and the communication data history is stored even after the failure detection unit 10 detects the occurrence of a failure. . The second control unit 12 controls the communication unit 9, the failure detection unit 10, the communication data storage unit 14, and the second transmission / reception unit 11.

The second control unit 12 of the controlled device 2 causes the failure detection unit 10 to monitor the communication state between the communication unit 9 and the external communication device 13, and when the failure detection unit 10 detects that a failure has occurred. Receives a failure occurrence notification from the failure detection unit 10 and sends the failure information to the first control unit 7 of the control device 1 via the second transmission / reception unit 11 and the first transmission / reception unit 4.

The first control unit 7 of the control device 1 stores fault information relating to the fault that has occurred in the fault information storage unit 5 and stores the communication data history at the time of the fault from the communication data storage unit 14 of the controlled device 2. The communication data history is associated with the previously transmitted failure information, stored in the failure communication data storage unit 16, and stored in the failure information storage unit 5.
The failure information stored in the failure communication data storage unit 16 and the communication data history at the time of the failure associated therewith are output to the external device 8 via the interface unit 6.

The first control unit 7 transmits various control information input from the external device 8 via the interface unit 6 to the controlled device 2 via the first transmitting / receiving unit 4 to control the controlled device 2. 2 is output to the external device 8 via the interface unit 6, and various information notified from the controlled device 2 is presented to the administrator.

FIG. 2A is an explanatory diagram for explaining an example of the fault information storage unit, and FIG. 2B is an explanatory diagram for explaining an example of the fault communication data storage unit. As shown in FIG. 2A, the fault information storage unit 5 stores an identifier and fault information corresponding thereto, and as shown in FIG. 2B, the fault communication data storage unit 16 stores the identifier and the corresponding fault information. The communication data history at the time of the occurrence of the failure is stored. As described above, the control device 1 associates the failure information with the communication data history at the time of the failure by providing the identifier.

Next, the operation of the first embodiment will be described. The controlled device 2 communicates with the external communication device 13 via the communication unit 9. Data transmitted and received between the controlled device 2 and the external communication device 13 is stored in the communication data storage unit 14 as a communication data history, and when exceeding a predetermined storage capacity, the oldest communication data history is removed first. The latest transmission / reception data is always stored as the communication data history.
Further, the failure detection unit 10 constantly monitors the state of communication with the external communication device 13.

Here, as shown in FIG. 2B, for example, it is assumed that the controlled device 2 erroneously transmits the transmission data C to the reception data A where transmission data B should be transmitted. . Therefore, no response is returned from the external communication device 13, the controlled device 2 detects a timeout, and performs a retry, but there is no response, and the failure detection unit 10 sends a failure occurrence notification to the second control unit 12. .

The second control unit 12 which has received the notification of the occurrence of the failure
Sends the fault information to the control device 1 via the second transmission / reception unit 11.

The first control unit 7 of the control device 1 assigns the identifier 1 to the transmitted fault information (address number of the controlled device 2 in which the fault has occurred, type of fault, fault occurrence time, etc.), and The communication data history is read from the communication data storage unit 14 of the controlled device 2 while being stored in the information storage unit 5. The first control unit 7 stores, in the communication data history, the identifier 1 indicating the association with the previously transmitted failure information.
And store it in the fault communication data storage unit 16.

An administrator who knows the fact that a failure has occurred through the interface unit 6 of the control device 1 or other means (for example, an alarm display lamp of the controlled device 2, an alarm alarm, or a communication from the external communication device 13). The first control unit 7 stores the failure information such as the address number of the controlled device 2 in which the failure has occurred, the type of the failure, the failure occurrence time, and the communication data at the time of the failure associated therewith by the first control unit 7. Can be output to an external device via the interface unit 6 and detailed failure information can be read.

FIG. 3 is an explanatory diagram for explaining an example of the screen display of the display device. When outputting to a display device 17 such as a CRT or a liquid crystal display as the external device 8,
For example, as shown in FIG. 3, a failure history (a plurality of pieces of failure information) and communication data history related thereto can be displayed based on identifiers associated with each other.

According to the first embodiment, the controlled device 2
When the communication failure occurs, the failure information and the communication data history associated with the failure information are output to the external device 8 and presented to the administrator, whereby the cause of the failure can be quickly identified.

Further, when a failure occurs, the communication data history necessary for identifying the cause is transferred from the communication data storage unit 14 of each controlled device 2 to the failure communication data storage unit 16 of the control device 1 and held. The capacity of the communication data storage unit 14 of each controlled device 2 can be reduced.

Since the writing of the communication data storage unit 14 of each controlled device 2 is not stopped even after the occurrence of a failure, communication data is not lost, and it is possible to cope with a plurality of continuous failures.

FIG. 4 is a block diagram for explaining the configuration of the second embodiment of the present invention. In the second embodiment, for each controlled device 2, a read size specification that specifies the size of the communication data history read from the communication data storage unit 14 and stored in the fault communication data storage unit 16 of the control device 1 It is characterized by having a portion 18.

The size of the communication data history designated by the read size designation section 18 may be set differently for each controlled device 2. For example, for the controlled device 2 in which the failure occurs frequently and the cause of the failure is often complicated, the readout size is set large, and in the controlled device 2 where the occurrence of the failure is small and the cause of the failure is often simple. Sets the read size smaller. Further, the size of the communication data history designated by the read size designation unit 18 may be fixed in advance, but the desired size is determined by an input device such as a keyboard, a numeric keypad, and a mouse via the interface unit 6 of the control device 1. The value may be changed. In this case, the administrator can change the read size specified by the read size specifying unit 18 to a value that is considered to be the most appropriate via the interface unit 6 of the control device 1 based on the subsequent rule of thumb. In addition, a calculation unit for calculating the frequency of occurrence of a failure of each controlled device 2 during a predetermined period, the rank of the cause of the failure, and the like is provided in the control device 1 or the external device 8, and is designated in the reading size designation unit 18 based on the calculation result. The read size thus read may be automatically changed to an optimum value. Note that the configuration of the control device 1 is the same as the configuration of the first embodiment.

According to the second embodiment, the communication data history of the size specified by the read size specifying unit 18 is read, so that the capacity of the faulty communication data storage unit 16 can be saved and the efficiency of communication data analysis can be reduced. Bring about.

FIG. 5 is a block diagram for explaining the configuration of the third embodiment of the present invention. As shown in FIG. 5, in the third embodiment of the present invention, a recording medium 19 storing a program (network management program) for causing a computer to execute the network management processing described in the first embodiment. Having. This recording medium 1
Reference numeral 9 may be a magnetic disk, CD-ROM, semiconductor memory, or other recording medium.

The network management program is read from the recording medium 19 to the first control unit 7 and controls the operation of the first control unit 7 described above.

FIG. 6 is a block diagram for explaining the configuration of the fourth embodiment of the present invention. As shown in FIG. 6, the fourth embodiment of the present invention relates to a recording medium 20 storing a program (network management program) for causing a computer to execute the network management processing described in the second embodiment. Having. This recording medium 2
0 may be a magnetic disk, CD-ROM, semiconductor memory, or other recording medium.

The network management program is read from the recording medium 20 by the first control unit 7 and controls the operation of the first control unit 7 described above.

The present invention is not limited to the above embodiment, and various changes can be made within the scope of the technical matters described in the claims. For example, a personal computer, a workstation, or the like may be connected to the interface unit 6 of the control device 1, and control may be performed using dedicated software or communication software. Also, the present invention
The present invention is not applied only to the collective communication device. For example, the control device 1 and the controlled device 2 are connected to a LAN (Local Area).
Network) etc. Further, the control device 1, the controlled device 2, and the external device 8 may be configured as one integrated device.

[0051]

According to the present invention, when a communication failure occurs in a controlled device, the failure information and the communication data history associated therewith are output from an external device and presented to an administrator, thereby specifying the cause of the failure. Can be done quickly.

Further, when a fault occurs, the communication data history necessary for identifying the cause is transferred from the communication data storage unit of each controlled device to the fault communication data storage unit of the control device, and is held. Of the communication data storage unit can be reduced.

Further, even after the occurrence of a failure, writing to the communication data storage section of each controlled device is not stopped, so that communication data is not lost, and it is possible to cope with a plurality of continuous failures.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a first exemplary embodiment of the present invention.

FIG. 2A is an explanatory diagram illustrating an example of a failure information storage unit, and FIG. 2B is an explanatory diagram illustrating an example of a failure communication data storage unit.

FIG. 3 is an explanatory diagram illustrating an example of a screen display of a display device.

FIG. 4 is a block diagram illustrating a configuration according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration according to a third embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram for explaining a configuration of a network management system according to Conventional Example 1;

FIG. 8 is a block diagram for explaining a configuration of a network management system according to Conventional Example 2.

[Explanation of symbols]

 1: Control device 2: Controlled device 3: Communication cable 4: First transmission / reception unit 5: Failure information storage unit 6: Interface unit 7: First control unit 8: External device 9: Communication unit 10: Failure detection unit 11: second transmission / reception unit 12: second control unit 13: external communication device 14: communication data storage unit 15: communication analysis device 16: fault communication data storage unit 17: display device 18: readout size designation unit 19: recording Medium 20: Recording medium

Continued on the front page F-term (reference)

Claims (9)

[Claims] 1. A network management system comprising a control device and a plurality of controlled devices controlled by the control device, wherein the control device communicates control information, fault information, and the like with the controlled device. A first transmitting / receiving unit for transmitting / receiving various information;
A failure information storage unit for storing the failure information transmitted via the first transmission / reception unit, a failure communication data storage unit for storing a communication data history at the time of the failure, and input / output of various information between the external device An interface unit connected to an external device to perform the control, and a first control unit that controls the first transmission / reception unit, the failure information storage unit, the failure communication data storage unit, and the interface unit. The apparatus includes: a communication unit connected to the external communication device for performing communication with the external communication device; a failure detection unit that monitors a communication state between the communication unit and the external communication device; Communication data storage unit for storing a communication data history between the communication device and an external communication device, and a second transmission / reception unit for transmitting / receiving various information such as control information and failure information between the first transmission / reception unit of the control device And communication unit and fault detection unit A communication data storage unit and a second control unit that controls a second transmission / reception unit. The second control unit of the controlled device includes a failure detection unit that connects the communication unit and the external communication device. The communication state is monitored, and when the failure detection unit detects the occurrence of a failure, the failure detection unit receives a failure occurrence notification from the failure detection unit, and sends the first communication device of the control device via the second transmission / reception unit and the first transmission / reception unit. The first control unit of the control device causes the fault information storage unit to store the fault information regarding the fault that has occurred, and communicates the fault data from the communication data storage unit of the controlled device. The data history is read, the communication data history is associated with the failure information, and stored in the failure communication data storage unit, and the failure information and the failure information stored in the failure information storage unit and the failure communication data storage unit, respectively. Associate it with Network management system the communication data history during failure, is output to an external device via the interface unit, and wherein the. 2. The failure information storage unit and the failure communication data storage unit store the failure information and the communication data history at the time of the failure in association with each other by assigning an identifier. Network management system. 3. The network management system according to claim 1, wherein the communication data storage unit of the controlled device deletes an old communication data history first when a predetermined storage capacity is exceeded. . 4. The communication data storage section of the controlled device, wherein the communication data history is stored even after the failure detection section detects the occurrence of the failure. A network management system according to claim 1. 5. A reading size specifying unit for specifying a size of a communication data history read from the communication data storage unit and stored in the fault communication data storage unit of the control device for each of the controlled devices. 5. The method according to claim 1, wherein
The network management system according to any one of the above items. 6. The network management system according to claim 5, wherein the size of the communication data history designated by said read size designation section can be changed to a desired value via an interface section of said control device. 7. A network management system comprising a control device and a plurality of controlled devices controlled by the control device, wherein the control device communicates control information and fault information with the controlled device. A first transmitting and receiving unit for transmitting and receiving various information such as
A failure information storage unit for storing the failure information transmitted via the first transmission / reception unit, a failure communication data storage unit for storing a communication data history at the time of the failure, and input / output of various information between the external device An interface unit connected to an external device to perform the control, and a first control unit that controls the first transmission / reception unit, the failure information storage unit, the failure communication data storage unit, and the interface unit. The apparatus includes: a communication unit connected to the external communication device for performing communication with the external communication device; a failure detection unit that monitors a communication state between the communication unit and the external communication device; Communication data storage unit for storing a communication data history between the communication device and an external communication device, and a second transmission / reception unit for transmitting / receiving various information such as control information and failure information between the first transmission / reception unit of the control device And communication unit and fault detection unit A communication medium storing a program for controlling a network management process by a network management system by a computer, comprising: a communication data storage unit; and a second control unit for controlling a second transmission / reception unit. A process of storing fault information sent from a controlled device in a fault information storage unit of a control device when a fault detection is detected in a communication state between a communication unit and an external communication device by a fault detection unit of the device. Reading a communication data history at the time of a failure from the communication data storage unit of the controlled device, associating the communication data history with the failure information, and storing the communication data history in the failure communication data storage unit; The fault information stored in the fault information storage unit and the fault communication data storage unit, and the communication data history at the time of the fault associated therewith are A recording medium on which is recorded a program for causing a computer to execute a process of outputting to an external device via the interface unit. 8. A process for reading a communication data history of a size designated by a read size designation unit provided for each controlled device and storing the history in a fault communication data storage unit of the control device. The recording medium according to claim 7, wherein the program is recorded. 9. A program for causing a computer to execute a process of changing the size of the communication data history designated by said read size designation section to a desired value is recorded.
A recording medium according to claim 1.