JPH0313028A - Constitution information generating system - Google Patents

Abstract

PURPOSE:To prevent communication between stations from being limited by instructing the notice of information to a management station to only an adjacent downstream station in the case of collecting the constitution information wit the management station. CONSTITUTION:When a management station 1 collects the constitution information of a system, the management station 1 sends a data frame 5 instructing the notice of station information of the management station 1 to an adjacent downstream station 2 at first. The station 2 receiving the instruction sends the station information to the management station 1. Then other stations 2, 3, 4 apply similar above-mentioned operation. Thus, the management station 1 receives the station information sequentially from all stations in a loop transmission line and generates the constitution information of the system in the loop transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a configuration information generation method, and particularly to a configuration information generation method in a loop-shaped transmission system.

[Prior Art] Generally, in a loop transmission system configured by connecting a plurality of stations in a loop, a management station connected within the loop is equipped with configuration information of the loop communication system. There was a need. In the prior art method of generating this configuration information, a management station uses circular communication to assign to each station connected to a loop communication system the addresses of adjacent upstream and downstream stations that the station has. The system's configuration information was generated by requesting a report of information including information, and re-editing the information sent from each station in response to this request.

Incidentally, examples of prior art related to this type of loop communication system include I, Nis, O (I.

S, ○) 8802-5 and the like are known.

[Problems to be Solved by the Invention] In the prior art described above, when a management station attempts to generate configuration information, the management station requests information from each other station using broadcast communication means. , the entire system temporarily enters a configuration information reporting state, and communication between stations is restricted until this process is completed. Furthermore, in response to broadcast communication from a management station, if there is a station that cannot receive a configuration information report request due to a busy buffer, etc., the management station retries configuration information generation. The problem is that it has to be done.

An object of the present invention is to solve the problems of the prior art, and to make it possible to collect configuration information of a loop transmission system without using broadcast communication or requiring complicated processing at a management station. The purpose of this invention is to provide a configuration information generation method based on the following.

[Means for Solving the Problems] According to the present invention, the object is to have each station connected in a loop transmission line notify station information to an adjacent downstream station to a management station. The station that receives the instructions notifies the management station of its own station information, and also has the function of communicating instructions to the management station, and the function of notifying the management station of its own station information including an individual address. This is achieved by communicating the instructions.

[Operation] When a management station collects configuration information, it only needs to communicate with adjacent downstream stations to instruct them to report information to the management station, and in reality, only individual communication is required. Since the configuration information can be collected by , the entire system enters the configuration information collection state, and communication between stations is not restricted. Furthermore, even if there are multiple management stations and these management stations collect configuration information at the same time, the configuration information of the loop transmission system can be collected without collisions between station information report requests. .

[Embodiment] Hereinafter, an embodiment of the configuration information collection method according to the present invention will be described in detail with reference to the drawings.

Fig. 1 is a diagram showing the configuration of a loop communication system, Fig. 2 is a diagram showing the format of a data frame, Fig. 3 is a block diagram showing the configuration of a station, and Fig. 4 explains a method of generating configuration information. It is a flowchart. Figure 1,
In FIG. 3, 1 is a management station, 2 to 4 are stations, 101 is a station management section, 102 is a transmission/reception control section, 103 is an address judgment section, 104 is a frame operation section, 105 is a reception switch, and 106 is for reception. 107 is a buffer for transmission, 108 is a transmission switch, and 109 is an address adding section.

As shown in FIG. 1, the loop communication system to which the present invention is applied includes a plurality of stations 1 to 4 connected by a loop transmission path. In Figure 1, 4
Although one station is shown, any number of stations may be connected. Also, in Figure 1,
Station 1 is the management station.

In the loop communication system configured as described above, when the management station 1 collects system configuration information, the management station 1 first transmits the station information of the station 2 to the adjacent downstream station 2. A data frame 5 instructing to notify the management station 1 is transmitted. Upon receiving this instruction, the station 2 transmits station information indicating its own station address and loop usage state to the management station 1, and also transmits the station information of the station 3 to the adjacent downstream station 3.
A data frame 5 instructing to notify is transmitted.

Thereafter, the other station 3.4 also performs similar operations as described above. Thereby, the management station 1 can sequentially receive station information from all stations connected within the loop transmission path, and can generate configuration information of the loop transmission system.

Next, the structure of data frames transmitted and received between each station and the structure of each station in order to perform the above-described operation will be explained.

The data frame has a bit N5A5 indicating that the frame is destined for a downstream adjacent station, as shown in FIG.
01 and bit BSY50 indicating that the receive buffer was busy and could not receive a data frame.
2, destination address DA503, and source address 5A
504, and an area INF305 for storing information addressed to each station or information such as instructions and responses regarding station management.

As shown in FIG. 3, each station 1 to 4 includes a station management section 101 and a transmission/reception control section 102. The transmission/reception control section 102 also includes an address determination section 103, a frame operation section 104, a reception switch 105, a reception buffer 106, and a transmission buffer 1.
07, transmission switch 108, and address adding section 109
It is composed of:

In the transmission/reception control section 102 configured as described above,
The address determination unit 103 determines whether DA503 or 5A504 of the data frame 5 sent via the loop transmission path.
The receiving switch 105
instructs the receiving operation. As a result, the information in the area INF305 of this data frame 5 is taken into the reception buffer 106 via the reception switch 105.

In this case, if the reception buffer 106 is in use and cannot receive information, the data frame 5 is processed by the frame operation unit 104 into the bit BS.
Y502 is set, and the signal is sent to the downstream side of the loop transmission path via the transmission switch 108 and the address adding section 109.

Furthermore, data frame 5, which is determined to be a data frame to be relayed by address determination section 103, is sent to the downstream side of the loop transmission path by resetting bit N5A501 by frame operation section 104, as described above. Ru.

When attempting to transmit a data frame addressed to a downstream neighboring station, that station sends data frame 5
bit N5A501 is set for the downstream adjacent station, and this data frame 5 is transmitted to the downstream side of the loop transmission path. At this time, the contents of the destination address DA503 in this data frame 5 may not be guaranteed.

In the present invention, since such bit N5A501 is provided, each station can transmit the data frame 5 addressed to the downstream adjacent station without knowing the address of the downstream adjacent station. In one embodiment of the present invention, the management station 1 is configured as follows and operates as described above.
The operation when generating system configuration information will be explained with reference to FIG.

(1) Management station 1 first starts algorithm 11 of its own station, and then
An instruction 51 is sent to the management station 1 to cause the management station 1 to report its own station information indicating the address of the station and the usage status of the loop.This instruction 51 sets bit N5A501 of the data frame to, for example, 11'. This can be done by transmitting a data frame indicating that it is addressed to the downstream adjacent station and having the address of the management station 1 in the area INF 305 (step 13).

(2) Station 2, which has received the above-mentioned instruction 51, starts its own algorithm 21 and first notifies management station 1 of its own station information 61, and then notifies downstream adjacent station 3 of that station. An instruction 52 is sent to the management station 1 to report its own station information indicating the address and the usage state of the loop (step 22.23).

(3) Station 3, which has received the above-mentioned instruction 52, starts its own algorithm 31 in the same way as station 2, first notifies management station 1 of its own station information 62, and then downstream adjacent station 4 An instruction 53 is sent to the management station 1 to cause the management station 1 to report its own station information indicating the address of the station and the usage status of the loop (step 32.
33).

(4) Station 4, which has received the above-mentioned instruction 53, starts its own algorithm 41 in the same way as station 2.3, first notifies management station 1 of its own station information 63, and then An instruction 54 is sent to the management station 1, which is a station, to cause the management station 1 to report its own station information indicating the address of the station and the usage status of the loop. In this case, station 4 performs the same operation as the other stations as described above, regardless of whether the downstream adjacent station of its own station is management station l (step 42.43)a (5) Management During the aforementioned operations of stations 2 to 4, station 1 receives data frames transmitted from each station and receives station information, thereby accumulating configuration information and transmitting station information to its own station. to the management station. This results in
Management station 1 knows that stations 2.3 and 4 exist downstream of itself, and can also know their addresses (steps 14 to 16).

(6) When the management station 1 determines in step 15 that an instruction to send station information to the management station, in this case, an instruction 54 from the station 4, has been received, the management station 1 determines that the collection of configuration information has been completed. The information is closed, the configuration information 12 is completed, the loop status is grasped, and the configuration information generation operation is completed (step 17).
).

The generation of configuration information as described above can be performed by sequentially accumulating address information from each station when the loop-shaped transmission path is single. In addition, if the loop-shaped transmission path is a double loop, the station information from each station includes information such as the usage status of the active loop and backup loop, and the presence or absence of loopback, in addition to address information. With this information, the order in which station information is stacked can be changed to generate current configuration information.

Furthermore, in the configuration information generation operation according to the present invention described above, if the receiving buffer of a certain station is in use, the station receives a message from an upstream adjacent station.
If the station cannot receive an instruction to transmit station information to the management station, the station indicates this in the bit BSY502 indicating that data frame reception is not possible, and sends the data frame to the downstream side of the loop transmission path.

This data frame is not received by any station and returns to the station that sent it. Therefore, the station detects that the instruction transmitted by the station itself was not received by the downstream adjacent station, and again sends the downstream adjacent station an instruction to transmit station information to the management station. As a result, once the management station issues a request to generate configuration information, it can reliably collect the configuration information of the loop communication system and generate the configuration information.

The embodiment of the present invention described above is one in which the present invention is applied to a system equipped with a single loop transmission line (a plurality of loop transmission lines are not coupled through one station), but the present invention can also be applied to a token bus type transmission system.

In this case, an instruction to send the station information mentioned above to the management station is placed in a token, which is control information for transferring the transmission right, and this token is sequentially transmitted to the next station that will have the transmission right. Bye.

[Effects of the Invention] As explained above, according to the present invention, configuration information of a loop communication system can be generated using a simple algorithm at both the management station and other stations other than the management station. Since the entire system is not temporarily occupied by the generation of configuration information, configuration information can be generated without placing a large load on the system even during normal system operation. It can be performed.

Furthermore, according to the present invention, even when requests for configuration information generation are generated from multiple stations, there is no need to consider collisions and conflicts among these requests, so that the software and hardware that manage the loop communication system can be simplified.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration of a loop communication system, Figure 2 is a diagram showing the data frame format, Figure 3 is a block diagram showing the configuration of each station, and Figure 4 explains the method of generating configuration information. This is a diagram. 1... Management station, 2-4...
Station, 101... Station management section, 102... Transmission/reception control section, 103...
・Address determination section, 104... Frame operation section, 105... Reception switch, 106...
Reception buffer, 107...Transmission buffer,
108: Old: Transmission switch, 109: Address addition section. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a loop transmission system in which a plurality of stations including a management station are connected by a loop transmission path, when the management station collects configuration information on the loop transmission path, the management station collects configuration information on the loop transmission path. The station instructs the adjacent downstream station to notify the management station of station information including the station's address using means for communicating only with the adjacent downstream station, and the station receives this instruction. The station notifies the management station of its own station information, and also notifies the management station of station information including the address of that station, using a means to communicate only with the adjacent downstream station. A configuration information generation method characterized in that the downstream stations sequentially perform operations similar to those described above. 2. The configuration information generation method according to claim 1, wherein the loop-shaped transmission path is a single loop-shaped transmission path. 3. In a token bus type transmission system in which multiple stations including a management station are connected to the same transmission path, when the management station collects configuration information on the transmission path, the management station has the right to transmit. The token to be transferred is sent with instructions for the station that received the token to notify the management station of its station information, including the station's address, and the station that received the token transfers its own station information. When transmitting a token to another station while notifying the management station, the above-mentioned instructions are placed on the token, the token is transmitted to the next station that will have transmission rights, and the token is sent to another station. A configuration information generation method characterized in that stations sequentially perform operations similar to those described above.