JP3013139B2 - Node number automatic setting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a node number for each node of a loop type transmission system by remote control, and more particularly to a method for automatically setting a node number by polling. It is about.

2. Description of the Related Art A system is used in which a plurality of nodes are arranged on a loop-type transmission path, and each node transmits and receives information and communicates using a node number assigned to each node as an address.

In such a communication system, the assignment of a node number to each node is required to be set in a polling format by remote control from an external control device connected to any of the nodes.

[0004]

2. Description of the Related Art A node number is required for each node in a loop transmission system when controlling or monitoring each node.

Conventionally, a node number is assigned to each node in a loop transmission system by setting by operating a hardware switch (dip switch) in each node, or by software setting by connecting an external setting device such as a personal computer to the device. The way was being taken. Therefore, when performing the setting of the node number, the maintenance person goes to the device in each node and performs a necessary operation to set the node number.

[0006]

However, in the conventional node number setting method, since the maintenance person needs to go to the node in each node and perform the operation, the setting place of the apparatus is distant or plural places. When setting to, not only the work turn is required but also many human work mistakes are likely to occur, and if there is a mistake in setting, it is necessary to go to the installation location of the device again, so it is very There was a problem that it took time and effort.

On the other hand, a method of assigning a node number by remote control can be considered. However, even if an attempt is made to set the node number by remote control, the node to be set cannot be specified by the node number before setting the node number. could not.

The present invention is to solve such a problem of the prior art, and can automatically (software) set a node number in a loop transmission system by remote control. It is an object of the present invention to provide an automatic node number setting method.

[0009]

In a loop transmission system in which a plurality of nodes are connected in a loop, when a node number automatic control command is received, a setting history flag indicating the setting of the node number in the own node is turned on. , The node number automatic control instruction is relayed to the adjacent node in a predetermined direction, and when the setting history flag is not turned on, the designated node number is set as the number of the own node, Each node has a function of turning on the setting history flag and returning a response of the completion of node number setting in the reverse direction. When the external control device connected to one of the nodes issues a node number automatic control command by designating the node number and receives a response indicating that the node number setting has been completed, the previous node number is sequentially incremented. Further, by repeating the procedure for issuing a node number automatic control command, a node number is set for each node in a polling format.

[0010]

FIG. 1 is a diagram for explaining the operation of the present invention.
(A) shows the configuration of the loop transmission system, 1 to 3 are connection nodes forming the loop transmission system, and 10 is an external control device connected to the connection node 1, for example.
(B) is a schematic flow showing a node number setting procedure of each node.

[0011] When each connection node receives a node number automatic control command from the external control device by executing the node number automatic setting procedure of the external control device, whether or not the node number setting history flag in its own node is on. See if it is. Here, the setting history flag is turned on when the node number is set in the own node.

When the setting history flag is not turned on, since the node number has not been set in the own node, the node number specified by the external control device is set as the node number of the own node. Turn on the setting history flag. Then, a response indicating the completion of the node number setting is returned to the external control device.

When the setting history flag is on, the node number of the own node has already been set, so that the node number automatic control command is relayed to the next adjacent connection node. Thereby, the node number is automatically set in the next connection node.

FIGS. 2 and 3 show the node number setting sequences (1) and (2) according to the method of the present invention, respectively. are doing.

The external control device 10 executes a procedure for setting a node number for the connection node 1 and issues a command to set, for example, 01 as the node number. As a result, the connection node 1 connected to the external control device 10 sets the node number of the own node to 01 and returns a response of the setting completion to the external control device 10.

Next, the external control device 10 executes a procedure for setting a node number for the connection node 2 and issues a command for setting 02 as a node number. Since the connection node 1 connected to the external control device 10 has already completed the setting of the node number, the control command for setting the node number 02 is relayed to the next connection node 2, whereby the connection node 2 is connected.
Sets the node number of its own node to 02 and returns a response command to the connection node 1, and the connection node 1 returns a response of the setting completion to the external control device 10.

The external control device 10 then executes a procedure for setting a node number for the connection node 3 and issues an instruction for setting 03 as the node number. Since the connection node 1 connected to the external control device 10 has already set the node number, it relays the control command for setting the node number 03 to the next connection node 2. Since the connection node 2 has already set the node number, it relays the control command for setting the node number 03 to the next connection node 3. As a result, the connection node 3 sets the node number of its own node to 03.
And the response command is returned to the connection node 1 via the connection node 2, and the connection node 1 returns a response of the setting completion to the external control device 10.

Next, the external control device 10 executes a procedure for setting a node number for the connection node 4 and issues a command for setting 04 as the node number. Since the connection node 1 connected to the external control device 10 has already set the node number, it relays the control command for setting the node number 04 to the next connection node 2. Since the connection node 2 has already set the node number, it relays the control command for setting the node number 04 to the next connection node 3. Since the connection node 3 has already set the node number, it relays the control command for setting the node number 04 to the next connection node 1. As a result, the connection node 1 returns a response indicating that the node number 04 cannot be set to the external control device 10. The external control device 10 recognizes the completion of the setting of the node numbers of all the nodes, and starts operation of the loop transmission system.

As described above, according to the node number automatic setting method of the present invention, the setting history flag indicating whether or not the node number has already been set in each node is used.
For example, the node numbers are sequentially set one by one in a polling format while being uncontrolled in the clockwise order, so that the node numbers of the nodes in the loop transmission system can be set by remote control. In the above description, the node number is set clockwise in the loop. However, the same can be performed in the counterclockwise case.

[0020]

FIG. 4 shows a loop type transmission system according to an embodiment of the present invention, in which the number of nodes is six. Note that the maximum number of nodes is 12, and the node number N is 1 ≦ N ≦ 12. In the figure, 1
Reference numerals 1, 12, 13, 14, 15, and 16 denote transmission devices (connection nodes) in the loop transmission system, and reference numeral 20 denotes an external control device connected to the connection node 11. The transmission signal is transmitted clockwise or counterclockwise as indicated by the arrow. FIGS. 5 to 7 are flow charts (1) to (3) respectively showing the node number automatic setting method of the present invention, and show the operation flow up to the connection nodes 11 and 12; The same applies to the operation flow of No. 16. Some of the numbers assigned to the following items correspond to the numbers assigned to the steps in FIGS.

(1) The external control device 20 sets the node number to an arbitrary value. For example, assume that the node number is N. In this case, 1 ≦ N ≦ 12.

(2) The external control device 20 starts automatic setting of the node number. A node number automatic control command is sent clockwise from the external control device 20, and the node number = N
Instruct.

(3) The connection node 11 connected to the external control device 20 receives a node number automatic control command from the external control device 20.

(4) The connection node 11 checks whether or not the node number setting history flag of its own node is on.

(5) Since the setting history flag is not turned on, the connection node 11 sets the node number to N,
Turn on the setting history flag of the own node. Then, with the node number = N, a node number setting response is made counterclockwise.

(6) The external control device 20 is connected to the connection node 11
When the node number setting response is received, the node number is incremented, a node number automatic control command is sent clockwise, and the node number = N + 1 is indicated by the node number automatic setting command. (At this time, if the node number becomes 13, it is preset to 1.)

(7) The connection node 11 connected to the external control device 20 receives a node number automatic control command from the external control device 20.

(8) The connection node 11 checks whether the node number setting history flag of its own node is on.

(9) Since the setting history flag is turned on, the connection node 11 transfers the node number automatic control command to the connection node 12 on the right side.

(10) The connection node 12 is connected to the connection node 11
Receives the node number automatic control command from the external control device 20 transferred from the PC.

(11) The connection node 12 checks whether or not the node number setting history flag of the own node is on.

(12) Since the setting history flag is not turned on, the connection node 12 sets the node number to N + 1 and turns on the setting history flag of its own node. Then, with the node number = N + 1, a node number setting response is made counterclockwise.

(13) The connection node 11 has a node number = N
As +1, the node number setting response from the connection node 12 is relayed counterclockwise.

(14) The external control device 20 is connected to the connection node 1
When the node number setting response from 1 is received, the node number is incremented and the node number automatic control command is sent clockwise.
Indicates node number = N + 2. (At this time, if the node number becomes 13, it is preset to 1.)

(15) Thereafter, the same operation as in (6) to (14) is repeated until the operation up to the node 16 is performed.

(16) The external control device 20 is connected to the connection node 1
6, when the node number setting response is received, the node number is incremented and the node number automatic control command is sent clockwise.
Indicate node number = N + 6. (At this time, if the node number becomes 13, it is preset to 1.)

(17) Since the setting history flag is on, the connection node 11 passes the node number automatic control command clockwise.

(18) Similarly, since the setting history flag is on at the nodes 12 to 16, the node number automatic control commands are passed clockwise, respectively.

(19) The connection node 11 knows that the node numbers have been set to all the nodes since the node number automatic control command transmitted from the own node has returned after circling the loop. The transmitted node number N;
The calculation is performed from the received node number N + 6, and the fact that the number of nodes in the loop is 6 is reported to the external control device 20.

As a result, the external control device 20 recognizes that the node numbers of all the nodes have been set, and starts operation of the loop transmission system.

As described above, according to the node number automatic setting method of the present invention, an arbitrary node number can be assigned to each node constituting a loop even if a node number for controlling each node is not set in advance. By sequentially setting, the node number can be automatically set.

[0042]

As described above, according to the present invention, in the loop type transmission system, the node numbers of all the nodes are set in a polling format by remote control from an external control device connected to one of the nodes. So you can
It is not necessary to go to the device installation location of each node for setting the node number, so that the number of work steps can be reduced and the occurrence of human error at the time of the setting operation can be prevented. It is also easy to reset the node number.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams for explaining the operation of the present invention, in which FIG. 1A shows a configuration of a loop type transmission system, and FIG. 1B is a schematic flow showing a node number setting procedure of each node.

FIG. 2 is a diagram showing a node number setting sequence (1) according to the method of the present invention.

FIG. 3 is a diagram showing a node number setting sequence (2) according to the method of the present invention.

FIG. 4 is a diagram showing a loop transmission system according to one embodiment of the present invention.

FIG. 5 is a flowchart (1) showing a node number automatic setting method of the present invention.

FIG. 6 is a flowchart (2) showing a node number automatic setting method according to the present invention.

FIG. 7 is a flowchart (3) showing the node number automatic setting method of the present invention.

[Explanation of symbols]

 1 connection node 2 connection node 3 connection node 10 external control device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-226757 (JP, A) JP-A-62-107553 (JP, A) JP-A-60-20662 (JP, A) JP-A-3-3 72740 (JP, A) JP-A-3-206751 (JP, A) JP-A-63-283251 (JP, A) JP-A-61-105942 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) H04L 12/423

Claims (1)

(57) [Claims] In a loop-type transmission system in which a plurality of nodes (1 to 3) are connected in a loop, when a node number automatic control command is received, a setting history flag indicating the setting of a node number in the own node is set. When it is ON, the node number automatic control command is relayed to an adjacent node in a predetermined direction, and when the setting history flag is not ON, the designated node number is set as the number of its own node. At the same time, each node (1 to 3) has a function of turning on the setting history flag and returning a response of the completion of the node number setting in the reverse direction, and the external control device (4) connected to any of the nodes has
Issuing the node number automatic control command by designating the node number, and when receiving the response of the node number setting completion, sequentially repeats the procedure of sequentially incrementing the previous node number and issuing the node number automatic control command. A node number automatic setting method, wherein a node number is set to each node in a polling format.