JPH07231329A - Numbering device for network address - Google Patents

Abstract

PURPOSE:To provide a numbering device for network address to reduce the burden on network management by automatically managing network addresses. CONSTITUTION:A master node 11 is provided with a message transmitting means 14 for the address numbering reception message of a new slave node, an address information managing table 15, an address managing means 16 for retrieving the idle address of the address information managing table 15 corresponding to an address numbering request from the new slave node, selecting one address, turning it under use, confirming the separation of a provided slave node and turning the address under use in the address information managing table 15 to a non-issued state, and a new address transmitting means 17 for transmitting the new address selected by the address managing means 16 to the new slave node. On the other hand, a new slave node 13 is provided with an address numbering request means 18 for requesting address numbering to the master node 11, node address storage part 19 for storing the node address, and an address registering means 20 for registering the new address transmitted from the master node 11 onto the node address storage part 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network address numbering device for managing a node address for identifying a node constituting a network.

[0002]

2. Description of the Related Art When configuring a network, a unique number (node address) is required to identify each node. It is necessary to manage these node addresses in some form so that they do not overlap when the number of nodes in the network is increased or decreased due to new installation or removal. Conventionally, the node addresses have been manually maintained.

[0003]

However, in the conventional network, the number of connected nodes increases,
In addition, if the frequency of new installation or removal from the network is high, the procedure becomes complicated and it becomes difficult to manage the node address.

Japanese Patent Laid-Open No. 2-224447 discloses an address setting device for automatically setting a network address system. However, a node address is set in a new slave node or an existing slave node is separated. Does not leave the node address unissued.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a network address numbering device which can automatically manage network addresses and reduce the burden of network management.

[0006]

In order to achieve the above object, a network address numbering device of the present invention is a network address for managing a node address of a slave node to which a master node is connected via a transmission line. In the numbering device, the master node includes a message transmitting means for transmitting an address numbering acceptance message of the new slave node in the message transmission to the existing slave node, and an address information management table for managing the node address. , In response to an address numbering request from the new slave node, search for an empty address in the address information management table and select one of them to put it in use, and
Address management means for confirming the departure of the existing slave node and setting the in-use address of the address information management table in an unissued state, and new address transmission means for transmitting the new address selected by the address management means to the new slave node The new slave node has an address numbering requesting means for making an address numbering request to the master node, a node address storage section for storing a node address, and a new address transmitted from the master node. Address registration means for registering in the node address storage unit.

It is preferable that the slave node is a sensor, and the master node is a centralized management device that centrally manages data detected by the sensor. It is preferable that the address number requesting means initializes a node address and sets an address request command. It is preferable that the address management unit sets the in-use address of the address information management table to the unissued state for a certain period of time while the communication with the existing slave node is disabled. It is preferable that the existing slave node is disconnected from the network by cutting off the power supply or cutting off a transmission line which is a physical line.

[0008]

According to the present invention, when a new slave node is added, the master node uses the message sending means to send not only polling to the existing slave node but also a time schedule message having an address numbering acceptance time. The address numbering request command of the newly established slave transmits the address numbering request command, and the master node receiving this command searches the node address vacancy information of the address information management table by the address management means and searches the vacant node. One of the addresses is selected, the address is transmitted by the new address transmission means, and the slave node receiving this address stores it in the node address storage unit by the address registration means. When the existing slave node leaves, the address management means of the master node sets the node address in the address information management table to an unused state because the slave node does not receive a response from the slave node for a certain period of time. As a result, the network administrator can automatically manage the address when the number of nodes is increased or decreased without being aware of the node address, which improves the flexibility of the network and reduces the burden of network management.

By using the slave node as a sensor and the master node as a centralized management device, the data detected by the sensor can be centrally managed. The slave node can easily request address numbering by initializing the node address and setting the address request command. Address management can be performed by setting the in-use address of the address information management table to the non-issued state for a certain period of time in the communication disabled state. You can easily disconnect the power of the existing slave node or disconnect it by a physical line.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings. FIG. 1 is a diagram for explaining the overall configuration of a network address numbering device according to an embodiment of the present invention.

In the figure, a network address numbering device 10 of the present embodiment has a plurality of slave nodes 1 connected to a master node 11 via a transmission line 12 which is a branch line.
, So that the master node 11 normally asks each slave node 13, ... To receive a message, while the master node 11 requests the slave node 13 to send a message if any, so-called polling / selecting method. In the network in which the data on the transmission line 12 is controlled so as not to collide by the control such as the above, the master node 11 has a message transmitting means 14, an address information management table 15, an address managing means 16 and a new address transmitting means 17. The new slave node 13
Has an address numbering requesting means 18, a node address storing part 19, and an address registering means 20.

The message transmitting means 14 is a part for transmitting the address numbering acceptance message of the new slave node 13 in addition to the normal message transmission to the slave node 13. The address information management table 15 is a part for storing management information including whether a predetermined node address is in use or in an empty state. The address management means 16 searches for an empty address in the address information management table 15 in response to an address numbering request from the new slave node 13 and selects one of them to put it in use, and confirms that it has left the existing slave node 13. Then, the used address of the address information management table 15 is set to the unissued state (empty state). The new address transmission means 17 is a part for transmitting the address selected by the address management means 16 to the new slave node 13.

The address numbering requesting unit 18 is, for example, a unit that sends the initialized node address to the master node 11 to make an address numbering request. The node address storage unit 19 is a unit that stores its own node address. The address registration unit 20 is a part that registers the new address transmitted from the master node 11 in the node address storage unit 19.

Next, an example of newly installing a slave node of a network address numbering device will be described. FIG. 2 is a diagram for explaining an example of newly installing a slave node of a network address numbering device according to the embodiment of the present invention, and FIG. 3 is a diagram for explaining a time schedule transmitted by a message transmitting means of a master node according to the embodiment of the present invention. FIG. 4 is a diagram for explaining the state of the address information management table after newly installing the master node according to the embodiment of this invention. The parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In FIG. 2, the network of this embodiment is, for example, a system in which a plurality of sensors are installed and the data is managed by a centralized management device, the centralized management device being a master node 11, and the plurality of sensors being slave nodes. 13,
Is ... Here, the existing slave nodes 13a, 13
b, 13c are their own node addresses 1, 2,
3, the new slave node 13d is connected to the master node 11 via the transmission line 12 (shown by the dotted line), and the node address of this slave node 13d is undecided. In the procedure for newly installing the sensor (slave node 13d), first, the sensor is installed at a predetermined installation location to perform physical work, and then the sensor sends an address numbering request command. This command transmission may be performed by pressing a switch, for example.

In FIG. 3, the master node 11 has, for example, all the existing slave nodes 13a, 13b, 1 from the minimum node address 1 to the maximum node address 3 sequentially.
Following polling to 3c, new slave node 13d
Has a time schedule for repeating the message transmission with the new address reception time.

In FIG. 4, the address information management table 15 shows a state after the new slave node 13d is numbered with the new node address 4, and the node addresses 1, 2, 3, 4 are in use (○). The other node addresses 5, 6, 7, ... (Indicated by a mark) indicate that they are in an unissued empty (indicated by empty) state.

Next, an example of leaving the slave node of the network address numbering device will be described. FIG. 5 is a diagram for explaining an example of leaving the slave node of the network address numbering device according to the embodiment of the present invention, and FIG. 6 is a diagram for explaining the state of the address information management table after leaving the master node according to the embodiment of the present invention. The parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In FIG. 5, the existing slave node 13
Each of a, 13b, 13c, and 13d has its own node address 1, 2, 3, and 4, of which the slave node 13b leaves (indicated by a dotted line). As a procedure for detaching the sensor (slave node 13b), for example, the power of the sensor is turned off or the transmission line which is a physical line is turned off.

In FIG. 6, the address information management table 15 shows the state after the slave node 13b of the node address 2 has left from the use state of the node address shown in FIG. Are in use (indicated by circles) and other node addresses 2, 5, 6.
.. indicates that it has not been issued and is in a vacant (indicated by an empty) state.

Next, the processing on the master node side and the slave node side of the network address numbering device according to the embodiment of the present invention will be specifically described. FIG. 7 is a flow chart for explaining the processing on the master node side of the embodiment of the present invention, and FIG. 8 is a flow chart for explaining the processing on the newly installed slave node side of the embodiment of the present invention.

In FIG. 7, the master node 11 first sets the minimum address of the node addresses in use in the address information management table 15 to the address counter by the message transmitting means 14 (ST1), and then the address counter. If there is transmission data in the slave node 13 indicated by, polling is requested to be transmitted (ST
2) The predetermined data is transmitted / received (ST3). Next, the master node 11 updates the address counter to the next address (ST4), and then all slave nodes 13
It is determined whether the polling has been completed (ST5), and if it is not completed, the polling process is repeated. If it is completed, the address numbering process is started, and the address counter is set to 0, which is the initialization state (ST6). . next,
The slave node 13 whose address counter indicates 0 is polled (ST7), and the slave node 1
It is judged whether or not there is a reply to the new address acceptance request from ST3 (ST8), and if there is no reply, the process ends.
An unused address is searched for, an address is issued, and the address is transmitted by the new address transmission means 17 to the new slave node 13 that has requested the address (ST9). Then, the master node 11 receives the address reception confirmation signal from the new slave node 13 by the address management means 16 (ST10), and the address information management table 1
5 is updated (ST11), and the process ends.

In FIG. 8, first, in the newly established slave node 13, the address number requesting means 18 initializes the node address (0) (ST21) and sets an address request command (ST22). Next, an address request is made in response to the polling from the master node 11 (ST23), and the new address sent is received (ST24). The slave node 13 having received the new address stores the address in the node address storage unit 19 by the address registration means 20 (ST25), and sends an address reception confirmation signal confirming that the address has been received to the master node 11. (ST26) The process ends.

In the network address numbering device 10 configured as described above, the master node 11 uses the message transmitting means 14 not only for normal polling of the existing slave node 13 but also for a time schedule message having an address number reception time. Is sent in the same format as polling, and when adding a new slave node 13,
The address numbering request means 18 of the new slave 13 transmits an address numbering request command, and the master node 11 which receives this command sends the address numbering request command to the address management means 1
6, the empty information of the node address of the address information management table 15 is searched, one of the empty node addresses is selected, the address is transmitted by the new address transmission means 17, and the slave node 13 which has received this address.
Is stored in the node address storage unit 19 by the address registration means 20. The new slave node 13 in which the node address is registered operates thereafter similarly to the existing slave node 13. Also, when the existing slave node 13 leaves, the address management means 16 of the master node 11 confirms that there is no response from the slave node 13 for a certain period of time, for example, confirms that the communication disabled state continues for a certain period of time. The node address of the address information management table 15 is made unused. Therefore, the network administrator can automatically manage the address when the number of nodes is increased or decreased without being aware of the node address, the flexibility of the network is improved, and the burden of network management is reduced.

In the above embodiment, an example in which the central management device is the master node and the sensor is the slave node has been described, but at least the master node manages the node address of the slave node connected via the transmission path. Applies to network systems.

Although the preferred embodiment of the present invention has been described, it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention.

[0027]

As described above, according to the present invention, when a new slave node is newly installed, the master node is not limited to polling the existing slave node by means of the message transmitting means, and also the time schedule having the address numbering acceptance time is set. The master node which has sent the message, transmitted the address numbering request command by means of the address numbering request means of the newly established slave node, and has received this command, the master node which has received this command, uses the address management means to determine the availability information of the node address Is searched for, one of the vacant node addresses is selected, the address is transmitted by the new address transmission means, and the slave node which receives this address is stored in the node address storage section by the address registration means. When the existing slave node leaves, the address management means of the master node sets the node address in the address information management table to an unused state because the slave node does not receive a response from the slave node for a certain period of time. As a result, the network administrator can automatically manage the network address without being aware of the node address, and the burden of network management can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an overall configuration of a network address numbering device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of newly installing a slave node in a network address numbering device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a time schedule transmitted by the message transmitting means of the master node according to the embodiment of this invention.

FIG. 4 is a diagram illustrating a state of an address information management table after newly establishing a master node according to the embodiment of this invention.

FIG. 5 is a diagram illustrating an example of leaving a slave node of a network address numbering device according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating the state of the address information management table after leaving the master node according to the embodiment of this invention.

FIG. 7 is a flowchart illustrating processing on the master node side according to the embodiment of this invention.

FIG. 8 is a flowchart illustrating a process on the newly installed slave node side according to the embodiment of this invention.

[Explanation of symbols]

 10 Network Address Numbering Device 11 Master Node 12 Transmission Line 13 Slave Node 14 Message Sending Means 15 Address Information Management Table 16 Address Managing Means 17 New Address Sending Means 18 Address Numbering Requesting Means 19 Node Address Storage 20 Address Registering Means

Claims (5)

[Claims] 1. A network address numbering device for managing a node address of a slave node to which a master node is connected via a transmission line, wherein the master node includes a new slave in addition to message transmission to an existing slave node. Message sending means for sending a node address number acceptance message, an address information management table for managing node addresses,
In response to an address numbering request from the new slave node, it searches for an empty address in the address information management table and selects one of them to put it in use, and confirms that the existing slave node has left and is using the address information management table. Address management means for making an address in an unissued state, and new address transmission means for transmitting the new address selected by the address management means to the new slave node, wherein the new slave node addresses the master node. An address numbering request means for making a numbering request, a node address storage part for storing a node address, and an address registration means for registering a new address transmitted from the master node in the node address storage part. A numbering device with a characteristic network address. 2. The network address numbering device according to claim 1, wherein the slave node is a sensor, and the master node is a centralized management device that centrally manages data detected by the sensor. 3. The network address numbering device according to claim 1, wherein the address numbering request means initializes a node address and sets an address request command. 4. The network address according to claim 1, 2 or 3, wherein the address management means sets the in-use address of the address information management table to the unissued state after the communication with the existing slave node is disabled for a certain period of time. Numbering device. 5. The network address numbering device according to claim 1, wherein the existing slave node is disconnected from the network by cutting off a power source or cutting a transmission line which is a physical line.