JP3260646B2 - Ring-coupled network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to setting a station address of a slave station in a ring connection type network.

[0002]

2. Description of the Related Art Generally, when data is transferred on a network, a station address for identifying the station is set in advance to all stations in the network, and a transmission side designates a transfer destination by the station address. To send data.

When this station address is set to each station in the network, in a network where the number of connected stations used for connection of process input / output devices is up to about 300, a conventional operator operates a rotary switch or a dip switch. Either the setting is made physically for each station, or an interface for setting the station address is provided for all the stations, and the setting is made logically by the station address setting tool.

[0004]

When setting the station address by operating a switch, the operator must set the station address for each station, which takes time and effort. In addition, an operator mistake at the time of setting may cause an artificial mistake such as setting the same station address to a plurality of stations, and the duplicate setting of the station addresses has been a cause of transmission failure.

[0005] When a station address setting tool is used, a switch for setting a station address and an interface circuit for setting a station address are required for each station, which has caused an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been described in connection with a process input / output device connection network or the like.
An object of the present invention is to provide a network system and a method for automatically generating a station address in a ring connection type network used as one form of a small-scale network and setting the address using a transmission frame. .

[0007]

SUMMARY OF THE INVENTION The present invention is based on a ring-connected network system having one master station and a plurality of slave stations.

[0008] The master station in the network further comprises an information request frame transmitting means, a station address generating means, and a station address setting frame generating means. The information request frame transmitting means generates an information request frame for requesting the slave station for information on the station connection configuration, and transmits the information request frame to a downstream station in the network.

The station address generation means recognizes the connection state of each slave station in the network from a frame returned by the slave station in response to the information request frame, and generates station address information for each slave station.

The station address setting frame generating means generates a station address setting frame including the station address information, and transmits the station address setting frame to a downstream station in the network.

Each of the slave stations further includes information request frame processing means, station address setting frame processing means, and station address setting means. When the frame received from the upstream station of the network is the above-mentioned information request frame, the information request frame processing means adds the information of the station connection configuration of the own station to the information request frame and transmits the frame to the downstream station of the network.

When the frame received from the upstream station of the network is the above-mentioned station address setting frame, the station address setting frame processing means acquires the above-mentioned station address information from the position corresponding to the own station of the station address setting frame and Delete and send to downstream station of network.

The station address setting means sets the own station address based on the station address information obtained by the station address setting frame processing means. When the ring-connected network is configured by a shelf on which one or more master stations and slave stations are mounted, the present invention can also have the following configuration.

The shelf includes a representative station address distribution unit. Each slave station further includes a representative station setting unit. The representative station address distribution means sets a representative station address for each of the shelves and distributes the representative station address to each of the slave stations in the mounted shelf.

The representative station setting means fetches the representative station address. In the present invention, the shelf may further include a mounting position distribution unit, and each slave station may further include a mounting position setting unit.

The mounting position distribution means distributes the mounting position information of the slave station mounted on itself to each slave station. In the mounting position setting means, the slave station takes in the mounting position information.

According to the present invention, the station address of each slave station is set by transmitting the frame generated by the master station into the network. No switches are required.

Further, since the master station transmits an information request frame to the slave stations and generates the station address information of each slave station based on the reply from the slave station, the same station address may be repeatedly set to a plurality of slave stations. There is no.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing the operation of each station in the network when generating and setting a station address according to the first embodiment of the present invention.
FIG. 2 shows that when the master station transmits Req frame 2 and recognizes the existence of slave stations in the network and their connection order, FIG. 2 shows that the master station transmits station address setting frame 3, and each slave station transmits the station address setting frame 3. It shows the operation in the network when setting the station address based on the information from the address setting frame 3.

In the configuration shown in FIGS. 1 and 2, an arbitrary number of stations A to N are connected on the ring connection type network 1, of which the station A is a master station and the stations B to N are slave stations. As an initial stage, it is assumed that the station address has not been set in all the slave stations B to N. The arrows on the ring-coupled network 1 indicate the direction in which the frame data flows. The slave station closest to the master station A on the network 1 is the station B, and the next stations are the stations C,. . . , The most downstream station is station N. Also, since the network 1 is a ring-coupled network, the output from the slave station N at the most downstream is input to the master station A.

In the station address setting according to the present embodiment, as shown in FIG. 1, first, the master station A requests each slave station B to N in the ring connection type network 1 for information indicating a station connection configuration in the network. Req frame 2 is transmitted.

This Req frame 2 has a configuration having only a Req command (Req) at the head when transmitted from the master station A. In the description of the present embodiment, the frame configuration is omitted for parts that are not directly related to the gist of the present invention, such as control data. For simplicity of explanation, data in a frame transmitted and received between stations is only the minimum necessary for the present invention.

The Req frame 2 sent from the master station A to the network 1
Is received first. The slave station B determines from the Req command at the head of the received frame that this frame is a Req frame requesting a station connection configuration. Then, the own station configuration information IDb is added to the end of this frame (following Req) and transmitted to the downstream station.

Here, the self-station configuration information is information indicating the type and model of the slave station. For example, when a process input / output device is connected to the station, the device is provided with an analog input, an analog output, or a digital input. , Digital output, and data width thereof.

Next, the slave station C which is the next station after the slave station B transmits the frame (Req, I
Db) 2 is received, and if it is determined that this frame is a Req frame, the own station configuration information IDc is added to the end of the received frame (following IDb) and transmitted to the downstream station. Hereinafter, each slave station similarly adds its own station configuration information to the end of the frame and transmits the information downstream. Similarly, the most downstream slave station N also receives a frame (Req, ID) in which its own station configuration information IDn is added to the end of the received frame.
b, IDc,. . , IDn) 2 to the downstream station (master station A).

According to the above operation, the Req frame 2 transmitted by the master station A goes around the slave stations B to N in order, returns to the master station A through the ring connection type network 1. In the Req frame 2 returned to the master station A, the own station configuration information IDb to I added by each slave station is included.
Dn continues in the order of connection of the slave stations on the network 1.

The master station A receives the Req frame 2, and determines the own station configuration information (IDb, IDc,..., IDn) added after the Req command and its connection order.
The presence of the slave stations B to N on the network 1 and the connection order are recognized. Then, based on the information from the Req frame 2, the master station A determines the station addresses # 1 to #N of the slave stations B to N on the network 1. In the present embodiment, the station addresses are assigned in the order of connection on the network in the order of # 1, # 2,. . However, it is a matter of course that the present invention is not limited to this. If the same station address is not set repeatedly in a plurality of stations, another generation method may be used. For example, the station address is generated based on a connection in a network. Instead, the determination method may be based on the own station configuration information obtained from each slave station.

Next, the master station A sends a station address setting frame 3 to the slave station on the network 1 in the same manner as the Req frame 2. FIG. 2 shows a process in which each slave station sets its own station address using the station address setting frame 3.

The station address setting frame 3 includes, at the beginning, a Set command indicating that it is a station address setting frame, followed by station address information # 1 to #N used for setting station addresses of the slave stations B to N. Contains. This station address information is, after the Set command, the station address information # 1 of the station B, and then the station address information # 2 of the station C.
After the Set command, the station address information of each slave station follows the connection order in the network.

Station B that has received the station address setting frame 3 (Set, # 1, # 2,..., #N) from master station A
Recognizes that this frame is a station address setting frame from the Set command in the frame. And Set
The station address information # 1 following the command is taken in as the own station address and simultaneously deleted from the frame, and the station address setting frame 3 (Set, # 2,..., #N)
To the downstream station. The next slave station C transmits the frame (Req, # 2,..., #N) transmitted by the slave station B.
When station 3 is received and it is determined from the first Set command that this frame is a station address setting frame, as in station B, station address information # 2 following the Set command of the received frame is fetched as its own station address. At the same time, the station address setting frame (Se
t, # 3,. . , #N) 3 to the downstream station. Similarly, the slave stations D to N similarly receive the station address information following the Set command from the received station address setting frame 3 as the address information of the own station, delete the frame address at the same time, and transmit it to the downstream station.

In the station address setting frame 3 transmitted by the master station A by the above operation, the station address information # 1 to #N are deleted in each of the slave stations B to N, and the Set command is transmitted through the ring connection type network 1 once. And returns to master station A. When the master station A receives the station address setting frame 3 including only the Set command,
Each of the slave stations B to N takes in the station address information, and confirms that the station address has been set in each of the slave stations B to N. Each of the slave stations B to N sets a station address in the own station based on the acquired station address information (# 1 to #N) of the own station.

In this way, the exchange of frame data on the network 1 automatically sets the station address in each slave station. As described above, in the first embodiment,
The setting of the station address in the case where the station address is not set in all the slave stations in the network 1 has been described. Next, as a second embodiment of the present invention, some of the slave stations have already been set. An example of setting a station address when an address is set is shown.

FIGS. 3 and 4 are diagrams showing the operation of each station in the network when generating and setting a station address in the second embodiment. The configuration of FIGS. 3 and 4 is similar to that of FIG.
To N are connected, station A is a master station, and stations B to N are slave stations. Arrows on the ring connection type network 1 indicate directions in which data flows. Of the slave stations on the network 1 shown in FIGS. 3 and 4, the station addresses # 1 and # 10 are already set in the slave stations B and E, and the station addresses are not set in the other slave stations. I do.

FIG. 3 corresponds to FIG. 1 of the first embodiment, in which the master station A transmits a Req frame 2 and the presence of the slave stations B to N in the network 1 and the stations B and E. It shows the processing in each station for recognizing the address information and the connection order of each slave station.

As in the first embodiment, the master station A requests the slave station for information indicating the station connection configuration.
The q frame 2 is transmitted on the network 1. This R
The eq frame 2 is transmitted to the slave station B closest to the master station A.
Is received first, it is determined that the frame received from the Req command in the frame is a Req frame.

Since the station address # 1 has already been set in the slave station B, the station address information # 1 and the own station configuration information IDb set in the own station at the end of the frame (after the Req command) are stored. In addition, it is transmitted to the downstream station (slave station C). Next, the slave station C receives the Req frame (Req, # 1, IDb) transmitted by the slave station B, and recognizes that this frame is a Req frame from the Req command. Since the station address has not yet been set in the slave station C, only the own station configuration information IDc is added to the end of the received frame (following IDb) and transmitted to the downstream station. Since the next slave station D does not have the station address set, it adds its own station configuration information IDd to the end of the received frame and transmits the frame to the downstream station as in the case of the station C.

Since the station address # 10 is set in the slave station E, the received frame (Req, # 1, ID
(b, IDc, IDd), the station address information # 10 and the own station configuration information IDe are added, and the frame is transmitted to the next station. Since the station addresses are not set for the slave stations F to N, the own station configuration information I is sequentially set in the same manner as the stations C and D.
Only Df to IDn are added to the end of the received frame and transmitted to the downstream station.

According to the above operation, the Req frame 2 transmitted by the master station A goes around the slave stations B to N in order, returns to the master station A through the ring connection type network 1. In this Req frame 2, each of the slave stations B to
Station information # 1 of the slave stations B and E for which the configuration information IDb to IDn of N and the station address have already been set.
And # 10 are added in the order of connection of the slave stations on the network 1.

The master station A receives the Req frame 2 and, based on the information following the Req command, the presence of the slave stations B to N in the network 1, the station address information of the stations B and E, and each slave station on the network. Recognize the station connection order.

Then, based on the information from the Req frame 2, the slave station (C, D,
F to N) are generated. This generation method is performed, for example, by the station addresses # 2 and # 3 of the stations C to D starting with the station address information # 1 of the station B, and the station addresses of the stations F to N starting with the station address information # 10 of the station E. # 10, # 1
1,. . , # 10 + n. The generation method of the station address is not limited to the above-described method, and another generation method may be used as long as the same station address is not repeatedly set in a plurality of stations.

Next, FIG. 4 shows a process in which the master station sends the station address setting frame 3 on the network 1, whereby the station address generated by the master station is set in the slave station whose station address has not been set. .

After generating the station address, the master station A transmits a station address setting frame 3 to each slave station on the network 1. This frame starts with a Set command indicating that it is a station address setting frame, and subsequently, the station address information # 1, # 2, # 3, and the station address information of the stations B to D starting with the station address information # 1. Station address information # 10, # 1 of stations E to N starting with # 10
1,. . , # 10 + n in the order of connection of the slave stations.

The slave station that has received the station address setting frame 3 fetches and deletes the station address information following the Set command, as in the first embodiment, and deletes it, and transmits it to the downstream station. Hereinafter, the operation of the slave station and the operation of the master station A that has received one cycle of the frame are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, in the second embodiment, even if station addresses have already been set in some slave stations on the network 1, the station addresses are automatically set so that the station addresses of the respective stations do not overlap. Can be performed.

By the way, the above-mentioned network is realized by connecting each station with a cable, or mounting a plurality of stations on a single shelf on the network, and connecting such shelves with a cable.

FIG. 5 shows an example of a shelf on which stations on the network are mounted. As shown in FIG. 5, a plurality of stations 11 (seven mounting positions 0 to 6 in FIG. 5) are mounted on one shelf 10, and each station in the shelf 10 is connected to a base board in the shelf 10. They are joined in series by the above signal pattern. Also, both ends of the signal pattern are connected to the transmission cable 12 and exit outside the shelf 10. The shelves 10 are connected to each other by connecting the transmission cables 12 to form the network 1. The station 11 in the shelf 10 is given a mounting position number from a physical position mounted on the shelf of the station. This mounting position number is, for example, from # 0, # 1, # 2,. . It is decided in the form.

When setting the station addresses in the network, the station addresses are not automatically set in the order of connection in the network as in the first and second embodiments, but are fixed in units of this shelf. You may want to set an address. The third embodiment according to the present invention realizes such a case using a representative station address.

The representative station address is an address for setting a fixed value for each shelf unit. For example, a station mounted at the most upstream in the shelf 10 (the leftmost mounting position number in the case of FIG. 5) The station address of the “0” station is determined as the representative station address of the shelf.

FIGS. 6 and 7 are diagrams showing a request operation and a station address setting operation of the master station according to the third embodiment of the present invention. In the configuration of the third embodiment, an arbitrary number of stations A to N are connected to the ring-connected network 1, of which the station A is a master station, the stations B to N are slave stations, and The point that the arrow indicates the direction in which the frame data flows is the same as in the first and second embodiments described above.

The stations A to D and the stations E to N are mounted on the same shelves 10-1 and 10-2, respectively, and the respective stations are arranged on a base board (not shown) in the shelf 10 by a signal pattern such as a print pattern. They are connected in series. The representative station address setting / distribution circuits 20-1 and 20-2 are respectively provided on the base board 10-1 and 10-2.
Is implemented, and the slave station (representative station address setting / distribution circuit 20) in the same shelf uses the set representative station address information by using a signal pattern on the baseboard.
-1 is distributed to the stations B to D, and 20-2 is distributed to the stations E to N). Here, it is assumed that # 1 is set as the representative station address in the representative station address setting / distribution circuit 20-1, and # 10 is set in the representative station address 20-2. 6 and 7 is a configuration using two shelves, but the number of shelves and the number of stations mounted on the shelves are not limited to this.

FIG. 6 shows a case where the master station in the third embodiment is R
FIG. 9 is a diagram illustrating an operation in the network when transmitting an eq frame 2 and recognizing the existence of a slave station in the network and the connection order thereof.

When setting the station address, as in the first and second embodiments, first, the master station A transmits a Req frame 2 for requesting representative station address information to each slave station.

This Req frame is first transmitted to the master station A
, The slave station B in the same shelf 10-1 receives the signal. When the slave station B determines that the received frame is the Req frame 2 requesting the representative station address information, the slave station B changes the representative station address information # 1 set in its own station at the end of the received frame (after Req). Add and transmit to downstream stations. The representative station address information # 1 is distributed to each slave station in the same shelf 10-1 by the representative station address setting / distribution circuit 20-1.
Next, the slave station C in the same shelf 10-1 as the stations A and B transmits the frame (Req, #
1) is received, the representative station address information # 1 of the own station is added to the end of the received frame, and the frame is transmitted to the downstream station. The station D in the same shelf 10-1 also performs the same processing as that of the stations B and C on the received frame, and sends a Req to the downstream station.
Transmit frame 2. The Req frame 2 transmitted through all the stations in the shelf 10-1 and output from the station D is transmitted to the next shelf 10-2 via the transmission cable 12.

Req sent from shelf 10-1
The frame 2 is received first by the most upstream slave station E of the shelf 10-2. The slave station E receives the frame (R
eq, # 1, # 1, # 1) are identified as the Req frame 2, and at the end of the frame, the representative station address # 10 distributed by the representative station address setting / distribution circuit 20-2 and set in the own station is set. Add and flow to downstream stations. Hereinafter, similarly, the remaining slave stations F to N in the shelf 10-2 add their own representative station address information # 10 to the end of the received Req frame 2 and transmit the same to downstream stations.

By the above operation, the R transmitted by the master station A is transmitted.
The eq frame 2 has the representative station address information # 1 and # 10 of the slave stations B to N added for each station, and returns to the master station A after making a loop through the ring-connected network 1. The master station A receives the Req frame 2, and recognizes the existence of the slave stations B to N, the representative station address information of each station, and the connection order of each station from the information in the received frame.

Next, the master station A transmits the Req frame 2
The station address information of each slave station is generated based on the information from the slave station. This generation method is, for example, for the station B to the station D to which the same representative station address information # 1 is set, the station address information # 1, # 2, # 3 starting with # 1, the same representative station address Station address information # 10, # 11, # starting with # 10 for stations E to N for which information # 10 has been set.
10 + n.

The master station A, which has generated the station address information for each slave station, transmits a station address setting frame 3 including the station address information to the slave station.
FIG. 7 shows the operation in the network when the master station A transmits the station address setting frame 3 and each slave station sets the station address based on the information in the station address setting frame 3.

The station address setting frame 3 starts with a Set command indicating that it is a station address setting frame, and subsequently sets the same representative station address information # 1 to the stations B to D for which the same representative station address information # 1 has been set. Station address information # 1, # 2, # 3 starting with 1 and the same representative station address information #
The station address information # 10, # 11,. . , # 10 + n in the order of connection of each slave station in the network 1.

When each slave station that has received the station address setting frame 3 recognizes that the received frame is the station address setting frame 3, the slave station next to the Set command, as in the first and second embodiments, recognizes the received frame. At the same time as the address information is taken, it is deleted from the frame and transmitted to the next station. Hereinafter, the operation of each slave station and the operation of the master station A that has received the station address setting frame 3 that has made a round of the network 1 are the same as those in the first and second embodiments, and therefore will not be described.

As described above, in the third embodiment, the station address of each station can be automatically set using the representative station address set for each shelf. 8 and 9
It is a figure showing a 4th embodiment in the present invention.

The configuration of the fourth embodiment is almost the same as that of the third embodiment, except that a representative station is provided on a base board in a shelf 10-1 on which stations A to D are mounted. The address setting / distribution circuit 20 is not mounted, and the stations E to
The representative station address setting / distribution circuit 20-2 is mounted only on the base board in the shelf 10-2 on which the N is mounted, and the representative station address information # 10 is the same using the signal pattern on the base board. It is distributed to each slave station E to N in the shelf 10-2.

FIG. 8 shows a fourth embodiment in which the master station transmits a Req frame 2 and recognizes the presence of slave stations in the ring-coupled network 1 and the order of connection thereof in the network. It is a figure showing an operation.

Shelf 1 on which slave station B is mounted
Since the representative station address setting / distribution circuit 20 is not mounted on the base board 0-1, the representative station address is not set in the slave station B. Therefore, station B receives Req
When frame 2 is received, address information outside the range of addresses used as station addresses instead of representative station addresses, for example, address ranges assigned as station addresses in the present embodiment are denoted by # 1 to # 255. Then, the address information # 0 outside the range is added to the end of the Req frame 2 (following Req) and transmitted to the downstream station.

The next slave station C receives the frame (Req, # 0) transmitted by the station B because the representative station address is not set similarly to the station B, and the received frame is
When recognizing that the frame is the eq frame 2, the address information # 0 is added to the end of the received frame similarly to the slave station B, and the frame is transmitted to the downstream station. The next slave station D performs the same processing as that of the stations B and C on the received frame.

The Req frame 2 flown by the station D is transmitted through the transmission cable 12 and transmitted from the shelf 10-1 to the shelf 10
-2. Slave station E in shelf 10-2
To N, the representative station address information # 10 is set by the representative station address setting / distribution circuit 20-2.
Like the stations E to N of the embodiment, the representative station address information # 10 is added to the received Req frame 2 at the end of the Req frame 2 and transmitted to downstream stations.

With the above operation, the Re transmitted by the master station is transmitted.
The q frame 2 has the representative station address information # 0 and # 10 of the slave stations B to N added to the number of stations mounted on each shelf 10, and returns to the master station A through the network 1 once. The master station A receives the Req frame 2 and recognizes the existence of the slave stations B to N in the network frame 1, the representative station address information of each station, and the connection order of each station in the network 1. Then, station address information of each slave station in the network is generated based on the information from the received frame. This generation method is performed, for example, with respect to the stations B to D set with the same representative station address information # 0,
Address information # 1 and # that do not overlap with the station address information of N
2, # 3, the station address information # 10, # 11,. . , # 10 + n.

After generating the station address of each slave station, the master station A transmits a station address setting frame 3 including the station address information to the slave station. FIG. 9 shows a network according to the fourth embodiment when the master station A transmits the station address setting frame 3 and each slave station sets a station address based on information based on the station address setting frame 3. It shows the operation within.

Each slave station receives the station address setting frame 3 and recognizes that the frame is the station address setting frame 3 as in the first to third embodiments. At the same time as taking in the station address information, it is deleted from the frame and transmitted to the next station. Hereinafter, the operation of each slave station and the operation of the master station A that has received the station address setting frame 3 that has made a round of the network 1 are the same as those in the first to third embodiments, and a description thereof will be omitted.

As described above, in the fourth embodiment, even if there is a shelf having no representative station address setting / distribution circuit in the network, the slave stations in each shelf are based on the representative station address. Can automatically set the station address.

FIGS. 10 and 11 are diagrams showing a request operation and a station address setting operation of the master station according to the fifth embodiment of the present invention. In the configuration of the fifth embodiment, the master station A and the slave stations B to E on the ring connection type network 1 are mounted on the same shelf 10, and the stations are connected by a signal pattern on a base board in the shelf. I have. However, among the slave stations, the station C between the stations B and D is not mounted on the shelf 10 and the shelf 1
It is assumed that a portion corresponding to the mounting position number where the station C is to be mounted in 0 is empty, and a signal from the station B to the station D is connected to bypass the station C.

A representative station address setting / distribution circuit 20 is mounted on a base board (not shown) in the shelf 10, and the set representative station address information is transmitted to each slave station using a signal pattern on the base board. Distribute to B, D, E. Here, it is assumed that the representative station address is set to # 1. Further, a mounting position distribution circuit 30 is mounted on the base board, and the mounting position distribution circuit 30 transfers mounting position information # 00, # 02 to the stations B, D, and E from the mounting positions of the respective stations. , # 03. The mounting position information of the mounting position of the station C is # 01.
Shall be equivalent to

In the configurations shown in FIGS. 10 and 11, all the stations on the network 1 are mounted on one shelf. However, the present invention is not limited to this, and a configuration in which the stations on the network 1 are mounted on a plurality of shelves. I don't care.

FIG. 10 is a diagram showing an operation in the network when the master station in the fifth embodiment transmits a Req frame 2 to recognize the existence of slave stations in the network and the order of connection. It is.

In performing the station address generation / setting processing, the master station A first requests the slave station for representative station address information, as in the previous embodiments.
The frame 2 is sent to the network 1.

The slave station B closest to the master station A on the network 1 receives the Req frame 2 and
When the slave station B determines that the frame is the Req frame 2 from the command, the slave station B adds the representative station address information # 1 and the mounting position information # 00 set at the end of the received frame to the downstream, and Send to the station.

Next, the slave station D receives the frame (Req, # 1, # 00) transmitted by the slave station B, and at the end of the received frame, the representative station address information # 1 and the mounting position information # 02 of its own station. And transmit it to the downstream station. Similarly to the stations B and D, the slave station E adds the representative station address information of the own station and the mounting position information # 03 to the end of the frame and transmits the frame to the downstream station.

With the above operation, the master station A transmits R
In the eq frame, the representative station address information # 1 of the slave stations B to E and the respective mounting position information # 00, # 02, # 03.
Is added and returns to the master station A through the ring.
Master station A receives this frame, and slave station B,
The presence of D and E, the representative station address information of each station, the mounting position information, and the connection order are recognized. Further, it recognizes that there is an unmounted station (station C) between the slave stations B and D from the mounting position information.

Then, based on the information from the Req frame 2, station address information of each slave station is generated.
This generation method is, for example, the same representative station address information #
Stations B, D, and E set to 1 are generated based on the mounting position information by skipping the addresses (# 2) of # 1, # 3, and # 4 and the unmounted stations, starting with # 1. .

After generating the station address of each slave station, the master station A transmits a station address setting frame 3 including the station address information to the slave station. FIG. 11 shows the operation in the network when the master station A transmits the station address setting frame 3 and each slave station sets the station address based on the information in the station address setting frame 3. . This transmission frame is configured to include a Set command indicating the station address setting frame 3 and subsequent mounting position information for the slave stations, stations B, D, and E in the network 1.

The operations of the stations B, D, and E that have received the station address setting frame 3 from the upstream station, and the operations of the master station A that has received the station address setting frame 3 that has made a round are described in the first to fourth embodiments. Same as the form.

As described above, in the fifth embodiment, since the station address of each slave station is set based on the mounting position information, an unmounted station (station C) is added later and the station address is set. Even when resetting is performed, the station addresses of the stations (stations D and E) downstream from the station remain unchanged (# 3 and # 4) and the station (station C) has the station address # 2. Is set.

In the first to fifth embodiments, when the slave station receives the Req frame 2, the slave station adds information to the end of the frame. However, the present invention is not limited to this. The master station may recognize the connection state of the slave stations in the network 1 depending on the position in the frame or the structure of the information, for example, by adding to the frame. Also, the slave station fetched the station address information when receiving the station address setting frame 3, but
In this case as well, the information need not be the one following the Set command. For example, the information may be fetched from the end of the frame as long as the slave station can recognize where the information on the own station is.

[0083]

As described above, according to the present invention, the station address can be automatically set by using the transmission frame, so that the operator does not need to set the station address for each station, and the time and effort required for the setting are set. Can be omitted. Further, it is possible to prevent the duplicate setting of the station address due to the human error of the operator and the transmission failure caused by the setting. Further, there is no need to prepare a switch or an interface circuit for setting a station address for each station, and a cost advantage can be expected.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an operation in a network when a master station transmits a Req frame in a first embodiment.

FIG. 2 is a diagram illustrating an operation in a network when a master station transmits a station address setting frame according to the first embodiment.

FIG. 3 is a diagram illustrating an operation in a network when a master station transmits a Req frame in a second embodiment.

FIG. 4 is a diagram illustrating an operation in a network when a master station transmits a station address setting frame according to the second embodiment.

FIG. 5 is a diagram showing a shelf.

FIG. 6 is a diagram illustrating an operation in a network when a master station transmits a Req frame in the third embodiment.

FIG. 7 is a diagram illustrating an operation in a network when a master station transmits a station address setting frame according to the third embodiment.

FIG. 8 is a diagram illustrating an operation in a network when a master station transmits a Req frame in the fourth embodiment.

FIG. 9 is a diagram illustrating an operation in a network when a master station transmits a station address setting frame in the fourth embodiment.

FIG. 10 is a diagram illustrating an operation in a network when a master station transmits a Req frame in a fifth embodiment.

FIG. 11 is a diagram showing an operation in a network when a master station transmits a station address setting frame in the fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring connection network 2 Req frame 3 Station address setting frame 10 Shelf 11 station 12 Transmission cable 20 Representative station address setting / distribution circuit 30 Mounting position distribution circuit

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsuki Umehara 1 Fujimachi, Hino-shi, Tokyo Fujifacom Control Co., Ltd. (56) References JP-A-7-288537 (JP, A) JP-A-1 JP-A-192241 (JP, A) JP-A-60-41840 (JP, A) JP-A-8-223200 (JP, A) JP-A-5-347626 (JP, A) JP-A-4-360337 (JP, A) ) JP-A-9-224047 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/42

Claims (9)

(57) [Claims] 1. A ring-coupled network system having one master station and a plurality of slave stations, wherein the master station generates an information request frame for requesting information of a station connection configuration from the slave station. An information request frame transmitting means for transmitting an information request frame to a downstream station in the network; and a station for recognizing a connection state of each slave station in the network from a frame returned by the slave station in response to the information request frame. A station address generating means for generating address information; and a station address setting frame generating means for generating a station address setting frame including the station address information and transmitting the station address setting frame to a downstream station in a network. The slave station transmits the information request from the frame received from the upstream station of the network. When the frame is a frame, an information request frame processing means for adding information of the station connection configuration of the own station to the information request frame and transmitting the information to a downstream station of the network; In the station address setting frame, the station address information is acquired and deleted from the position corresponding to the own station in the station address setting frame, and the station address setting frame processing means for transmitting to the downstream station of the network; And a station address setting means for setting a station address of the own station based on the station address information obtained by the means. 2. An information request frame processing means of a slave station, of which a station address is already set among the plurality of slave stations, adds a station address of the own station to an information request frame together with the station connection information. Claim 1 characterized by the following:
A ring-coupled network system as described. 3. A ring-coupling network system comprising one master station and a plurality of slave stations, and a shelf in which one or more of the master station and the slave station are mounted. A representative station address is set for each slave station, and a representative station address distributing means is provided for distributing the representative station address to each of the slave stations in the shelf on which the representative station is mounted. An information request frame transmitting means for generating an information request frame to be requested and transmitting the information request frame to a downstream station in the network; and recognizing each slave station in the network from a frame returned by the slave station to the information request frame. Station address generating means for generating station address information for each of the slave stations; Station address setting frame generating means for generating a station address setting frame including station address information, and transmitting the station address setting frame to a downstream station in the network, wherein each of the slave stations sets the representative station address to capture the representative station address. Information request frame processing means for, when a frame received from an upstream station of the network is the information request frame, adding a representative station address of the own station to the information request frame and transmitting the information request frame to a downstream station of the network; When the frame received from the upstream station is the station address setting frame, the station acquires and deletes the station address information from a position corresponding to the own station in the station address setting frame, and transmits the station address information to the downstream station of the network. Address setting frame processing means, and the station address setting frame processing means And a station address setting means for setting a station address of the own station based on the station address information acquired by the station. 4. The ring-coupled network system according to claim 3, wherein said station address generating means generates station address information for each slave station based on a representative station address of said slave station. 5. The information request frame processing means of a slave station mounted on a shelf having no representative station address distribution means adds an address outside the range of a station address to the information request frame as a representative station address. 5. The ring-coupled network system according to claim 3, wherein: 6. The shelf further comprises mounting position distribution means for distributing mounting position information of a slave station mounted on itself to each slave station, and the slave station sets a mounting position for receiving the mounting position information. 6. The ring-coupled network system according to claim 3, further comprising: means for processing the information request frame, wherein the information request frame processing means adds the mounting position setting information together with the representative station address to the information request frame. . 7. The information request frame processing means adds the information of the station connection configuration or the representative station address of the own station to the end of the information request frame. 7. The ring-connected network system according to 5 or 6. 8. The station address setting frame processing unit acquires the first station address information of the station address information in the station address setting frame. , 6 or 7. 9. In a ring-coupled network system having one master station and a plurality of slave stations, the master station generates an information request frame for requesting the slave station for information on a station connection configuration. A request frame is transmitted to the downstream station of the network, a frame returned by the slave station in response to the information request frame is received, the connection state of each slave station in the network is recognized from the frame, and station address information for each slave station is recognized. And generates a station address setting frame including the station address information, and transmits the station address setting frame to a downstream station in the network.When each of the slave stations receives the information request frame, The information request frame is added with the information of the station connection configuration of the own station, transmitted to the downstream station, and received. When the frame is the station address setting frame, the station address information is obtained and deleted from the position corresponding to the own station of the station address setting frame, transmitted to the downstream station, and transmitted to the downstream station. A station address setting method in a ring connection type network system, wherein a station address is set.