JPH0252467B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication network consisting of one master station and a plurality of slave stations, and particularly relates to a communication network that is capable of arbitrarily changing the network configuration. This paper relates to a network management method.

[Conventional technology]

FIG. 3 is a diagram for explaining an example of a conventional network management method.

In the figure, MST is a master station, SLBa to SLVc are slave stations, and LINE is a communication line. The same symbols represent the same objects throughout all the figures below.

Conventional network management methods have two methods: when changing the system configuration, the system configuration table in the nonvolatile memory of the master station is changed in advance while offline, and the other method is to arbitrarily change the system configuration table while online and replay it to the slave station each time the change is made. There is a loading method.

The former has the disadvantage that system operation must be temporarily stopped when changing the system configuration.

In the latter case, a so-called reloading method is adopted in which the system configuration table provided in the master station is updated and the updated system configuration table is transferred to each slave station to update the table of each slave station. The load on the master station required for reloading increases,
Parallel processing with other online processing functions requires complicated control, which has the drawback of limiting the real-time performance of the system.

[Problem that the invention seeks to solve]

The present invention reduces the load on the master station by distributing the functions necessary for online system configuration changes to slave stations, and allows online system configuration changes without relatively affecting other online functions. The objective is to provide a network management method that can

[Means for solving problems]

The means to solve the problem is to use a communication network system that consists of one master station and multiple slave stations, and the master station uses a polling method to grasp the operating status of each slave station's equipment. All slave stations including the base station are each equipped with a system configuration table, and each slave station responds to the polling by adding the version number of its own system configuration table, and the master station responds to the polling by adding the version number of its own system configuration table. If there is a discrepancy, the latest changes will be notified to the slave station, and if a system configuration change such as an addition occurs to any station, the station where the change was made will notify the parent station. Network management that notifies the station of the changes, the master station changes its own system configuration table based on the notification, and sequentially notifies all slave stations of the changes and the version number of the table during the polling. This is achieved through a method.

[Effect]

The present invention provides the same simple table edit function to the master station and slave stations, and when the master station receives a request from the slave station to change the system configuration due to the addition of a slave station, etc., the master station stacks the edit commands, Since the tables of the slave stations are updated by sequentially transmitting stacked edit commands while checking the table version number of each slave station by polling, it is possible to handle a plurality of consecutive change requests.

〔Example〕

FIG. 1 is a block diagram of a master station and a slave station necessary for explaining an embodiment of the network management system according to the present invention.

FIG. 2 is a diagram for explaining the system change procedure.

In the figure, BOm is the communication control unit of the master station MST, and B1m
is the system status management section of the master station MST, B2m is the system configuration management section of the master station MST, and B3m is the master station MST.
Command stack part of MST, B4m is master station MST
, B5m is the random access memory (RAM) of the master station MST, and FL is the floppy disk.

BOa is the communication control unit of the slave station SLVa, B1a is the slave station
B2a is a communication control unit of SLVa, B2a is a system configuration management unit of slave station SLVa, B4a is a table editor of slave station SLVa, and B5a is a random access memory (RAM) of slave station SLVa.

Note that the ``b'' instead of ``a'' indicates the compatible device of the slave station SLVb, and the ``c'' indicates the compatible device of the slave station SLVc.

The details of the present invention will be explained below with reference to the drawings. As an example, we will explain the case where a slave station SLVb is newly registered and connected to the network while a system configuration consisting of a master station MST and slave stations SLVa and SLVc is in operation.

-At System Startup- At the time of system startup of the master station MST, its system configuration management unit B2m reads the system configuration table stored in the floppy FL and loads it into the random access memory B5m.

Next, the system state management unit B1m sends the slave station SLVal
and SLVc at fixed time intervals as shown in FIG. This polling operation is performed between B1m and B1a and between B1m and B1c.

When each slave station responds to the polling of the master station MST, it adds table holding information within itself and returns a polling response.

The system state management unit B1m checks the table holding information sent from each slave station, and if there is no table as a result, downloads the table to the slave station. In this case, this operation is B2m
-B2a and between B2m and B2c.

Once the table is downloaded to the slave station, the slave station will report that the table is available in subsequent polling responses. At this time, the version number of the table is added to the response.

- When changing the system configuration - We will describe the case where slave station SLVb is connected to the network during operation with the system configuration of master station MST and slave stations SLVa and SLVc as described above.

In this case, system configuration management section B2 of slave station SLVb
b sends a registration request to the system configuration management section B2m of the master station MST.

System configuration management department B2m that received the registration request
issues an edit command to table editor B4m in its own station and writes random access memory B5m.
Modify the contents of the system configuration table stored in . The contents of the latest system configuration table stored in the random access memory B5m are transferred to the floppy FL and updated. Next, after stacking the edit command in the command stack section B3m, a response is returned to the system configuration management section B2b of the slave station SLVb.

With the above operations, registration is completed and operation begins, and thereafter the master station MST also polls the slave station SLVb.

In this case, when the master station resumes polling, the slave station
At the time of polling responses from SLVa and SLVc, the system state management unit B1m detects that the table version number does not match that of the master station.

As a result, the system status management unit B1m notifies the system configuration management unit B2m of this fact. With this notification, B2m retrieves the edit command from the command stack section B3m and sends it to the slave station.
SLVa system configuration management unit B2a and slave station
It is transmitted to the system configuration component B2c of SLVc. B2 that received the above edit command
a and B2c change the contents of the system configuration table stored in their own random access memories B5a and B5c, respectively.

Also, at the time of the first polling reaction of the slave station SLVb, a response without a table is received, so the table is downloaded as described above.

Even if a new registration of a slave station is performed in this manner, all slave stations will hold the same system configuration table after a certain period of time has elapsed.

- When system notification is changed (Part 2) - This section deals with the case where the second system configuration is changed while the table of slave stations is being sequentially changed as described above. Capture.

If a certain slave station is registered while the master station and each slave station are operating with the same table, the difference in the table versions of the master station and slave stations will be determined by polling immediately after that. 1, the latest one of the stacked edit commands is sent to change the table of the slave station.

Therefore, if a second slave station is registered before the tables of all the slave stations have been changed, the difference in the table versions between the master station and the slave stations will be 2, so they will be stacked. Send the latest two edit commands to change the table of the slave station.

In the case of a polling response from a slave station that has already made changes due to the first registration, the difference in version number is 1, so in this case, send the latest one of the stacked edit commands and update the table of the slave station. Once changed, the table will be the same as the master station's table.

In either case, after a certain period of time has elapsed, each station can hold a common system configuration table.

〔Effect of the invention〕

According to the present invention described in detail above, the start-up of slave stations and changes in system configuration that occur at various timings can be executed in the same procedure regardless of the timing, and the master station and slave stations can be This has the great effect of making it possible to operate the network more efficiently and reliably since less communication processing is required between the networks.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a master station and a slave station necessary for explaining an embodiment of the network management system according to the present invention. FIG. 2 is a diagram for explaining the system change procedure. FIG. 3 is a diagram for explaining an example of a conventional network management method. In the figure, MST is the master station, SLVa to SLVc are slave stations, LINE is the communication line, BOm is the communication control unit of the master station MST, B1m is the system status management unit of the master station MST, and B2m is the system configuration of the master station MST. Management Department,
B3m is the command stack section of the master station MST, B4
m is the table editor of the master station MST, B5m is the random access memory (RAM) of the master station MST, FL
is Flotspy. BOa is the communication control unit of the slave station SLVa, B1a is the slave station
B2a is a communication control unit of SLVa, B2a is a system configuration management unit of slave station SLVa, B4a is a table editor of slave station SLVa, and B5a is a random access memory (RAM) of slave station SLVa. Note that the ``b'' instead of ``a'' indicates the compatible device of the slave station SLVb, and the ``c'' indicates the compatible device of the slave station SLVc.

Claims (1)

[Claims] 1 In a communication network system that consists of one master station and multiple slave stations, and the master station grasps the operating status of each slave station's equipment using a polling method, each slave station, including the master station, A configuration table is provided, and each slave station responds to the polling by adding the version number of its own system configuration table, and the master station compares the version number of its own system configuration table with the responded version. If there is a discrepancy, the latest changes will be notified to the relevant slave station, and when system configuration changes such as additions occur to any station, the station where the change was made will notify the master station of the changes, and the parent station will be notified of the changes. A network management method characterized in that a station changes its own system configuration table based on the notification, and sequentially notifies all slave stations of the changed contents and the version number of the table during the polling.