JPH07107996B2 - Station embedding method in ring network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a ring-shaped network, for example, when a station disconnected from a transmission line by power-off, that is, a station in a bypass state is connected to the transmission line by power-on. The present invention relates to a station embedding method in a ring-shaped network that allows a station already incorporated in a network to recognize that it has been newly incorporated in the network.

[Conventional technology]

Conventionally, in a ring network adopting the token passing system, a plurality of stations ST _{1 to} ST _N are connected to one ring transmission line RL to form a ring network as shown in FIG. By circulating the transmission right (token) on the network, only the station that has acquired the transmission right can transmit to another station.

That is, the station requesting to send, when receiving the right to send, the destination station number in the token,
A frame including a source station number, a data section and a frame status section is added and transmitted. On the other hand, the station receiving the frame addressed to itself passes the frame while reading the data part and sets "1" in the status part. Then, when this frame goes around the ring network and reaches the transmitting station, the transmitting station refers to the frame status part to confirm that the data has been received,
After that, only the token is delivered to a predetermined station.

By the way, each station is separated from the transmission line and is in a bypass state when the power is normally turned off. Therefore, for example, as shown in FIG. 5, when the station ST ₃ is in the power-off state, the token from the station ST ₂ bypasses the station ST ₃ and is delivered to the station ST ₄ . Station S in this state
When T ₃ is turned on, the station ST ₃ is electrically connected to the transmission line RL, but if no other station recognizes that the station ST ₃ is incorporated, the token ST The station ST ₃ newly incorporated in the transmission path RL is bypassed without being delivered, and is not incorporated in the network.

Conventionally, as a method of incorporating stations into this network, arbitrary stations ST _i and stations ST _{i + n}
Even when there are no stations ST _{i + 1 to} ST _{i + (n-1)} between the station ST _i and the station ST _i , the station ST _i always performs the necessary transmission processing after the token has come to itself, and always or at regular intervals. Hand over the token to station ST _{i + 1} . At this time, since there is no station ST _{i + 1 and} there is no response, the token is passed to the station ST _{i + 2} next. In this way, when the token is handed over to the existing station ST _{i + n} by repeating the same process, the handing over of the token is completed only after the response is returned. Therefore, when a new station is inserted between the station ST _i and the station ST _{i + n} , the token is also passed to this new station, so that it can be automatically incorporated into the network.

[Problems to be Solved by the Invention]

However, in the station embedding method in the above-mentioned conventional ring-shaped network, even if no new station is incorporated, the process of handing over the token to the station that is not connected to the transmission line is always or at regular intervals. Since this is done, there is an unsolved problem that it takes time to transfer the token to the actually connected station and the transmission efficiency deteriorates.

Therefore, the present invention allows a new station to be incorporated in a ring network without affecting the normal transmission / reception of a transmission right without the incorporation of the new station when the new station is connected to the transmission line. The purpose is to provide a station embedded system in a possible ring network.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a token passing ring network in which a plurality of stations are connected, to the station, a data processing unit and a waveform shaping circuit to which received data from a receiver is supplied, A selection circuit that selects the output data of the data processing unit and the waveform shaping circuit as transmission data and outputs the data via a driver is provided, and when the station is newly incorporated in the ring network, the selection circuit causes the waveform shaping circuit. Output data is selected and the received data from the receiver is monitored by the data processing unit to perform existing station recognition processing for recognizing other stations already incorporated in the network, and then the selection circuit While selecting the output data of the processing unit, In the state where the receiving state is continued at the other station in the transmission by discarding the token and frame received from the session, the frame with the source and destination data addressed to its own station is transmitted, and other existing It is characterized in that the built-in station is made to perform a station incorporation process for recognizing the incorporation of a new station, and then the transmission right is transferred to another station recognized in the reception process.

[Action]

In the present invention, the station newly connected to the transmission line recognizes the existence of another station already incorporated in the network by intercepting a frame circulating on the network as a reception state for a certain period of time,
After that, by discarding the tokens and frames of other transmitting stations, the other stations are forcibly set to the receiving state and a frame for making the other stations recognize that they are newly incorporated in the network as the transmitting state. After transmitting for a certain period of time on the transmission path, by handing over the transmission right to the station with the next largest station number among the other stations recognized in the receiving state, it is installed in the network and The transmission efficiency is improved without affecting the transmission of the transmission right.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, ST _i (i = 1,2 ... N) is a station which is cut into a transmission line RL, and a transmission / reception contact A ₁ is connected to a transmission line RL ₁ connected to an adjacent station ST _i-1. A receiver 1 connected via the receiver 1, a data processing unit 2 for processing the reception data received by the receiver 1, and a waveform rectification unit 4 for shaping the reception data received by the receiver 1 and supplying it to the driver 3.
And a transmission / reception contact A ₂ interposed between the driver 3 and a transmission path RL ₂ connected to the adjacent station ST _{i + 1} , and a bypass contact interposed between the transmission paths RL ₁ and RL _2. B, and a waveform shaping section 4, and a selection circuit C interposed between the data processing section 2 and the driver 3. Here, when the power of the station ST _i is turned off, as shown in FIG. 1, the transmission / reception contacts A ₁ and A ₂ are opened and the bypass contact B is closed.
When the power is turned on, conversely the transmission / reception contacts A ₁ and A ₂ are closed and the bypass contact B is opened. On the other hand, the selection circuit C selects the transmission data from the data processing unit 2 and the reproduction relay data of the waveform shaping unit according to the control signal from the data processing unit 2 and sends it to the driver 3.

The data processing unit 2 normally executes a normal transmission process, an existing station confirmation process, and a data reception process in a power-on state.

The normal transmission processing is in a normal reception state in which the token and the frame transmitted via the transmission line RL ₁ and the receiver 1 can be received, and when the token without the frame is received, the transmission data of its own is transmitted. At some time, the selection circuit C is switched to the data processing unit 2 side, and the destination station number DA and the transmission source station number SA shown in FIG. A frame F consisting of the following frame status part FS is added and the transmission line is transmitted via the driver 3.
When the frame F with the frame status section FS set to "1" is sent back from the destination via the transmission line RL ₁ after sending to RL ₂ and then to the receiving state, the frame F is removed and only the token is sent. Is passed to the station with the next highest station number, and when there is no transmission data of itself, the token is passed as it is to the next station.

In the existing station recognition processing, when the frame F is received via the transmission line RL ₁ and the receiver 1, the transmission source station number SA included in the frame F is stored in a predetermined storage area and incorporated in the ring network. Recognize stations (hereinafter referred to as existing stations).

In the data reception processing, the selection circuit C is switched to the waveform shaping section 4 side, and when the frame F is received, it is judged whether or not the destination station number RA matches its own station number, and if both do not match. In some cases, the frame F is passed as it is, and when they match each other, the frame F is passed through the transmission path RL ₂ via the waveform shaping section 4 and the driver 3 while copying the transmission data included in the information section I, When the frame status section FS is detected, the selection circuit C is switched to the data processing section 2 side and set to "1".

Further, the data processing unit 2 executes the station incorporation process described below immediately after the power is turned on.

In this station incorporation processing, first, all of the existing networks are set in a receiving state for a predetermined time longer than the time required to transmit data at least once, and then the transmission path is set.
The frame F transmitted via the RL ₁ is read, and the frame F received by the receiver 1 is read out via the receiver 1 by sending it to the transmission line RL ₂ via the waveform shaping section 4 and the driver 3. The existing frame is confirmed by analyzing the frame F. In the pair, the selection circuit C is switched to the data processing unit 2 side, the frame received via the receiver 2 is discarded, and the frame F having both the transmission source and the transmission destination data as its own station number is transmitted via the driver 3. The right to send is maintained by continuing the sending status for a predetermined time set to a time longer than the time required for all the existing stations to send the token, and then passing only the token to the station with the next highest station number. Is moved to shift to the normal processing.

Next, the operation of the above embodiment will be described. Now, for example, as shown in FIG. 4, the station ST ₃ is in the power-off state, and it is recognized that the station ST ₃ is not connected to the transmission line RL among other existing stations in the ring network. Therefore, it is assumed that there is no token or frame destined for the station ST ₃ .

In this state, as shown in FIG. 1, the station ST ₃ has its transmission / reception contacts A ₁ and A ₂ open and the bypass contact B closed, so that the transmission is performed via the transmission line RL _1. token and frame is bypassed to the transmission line RL ₂ through the bypass contacts B, the station number is next greatest stations of the existing station token from station ST ₂ which has been recognized in the station ST ₂
While being transferred to ST ₆ , data is transferred between the stations other than station ST ₃ .

From this state, as shown the stations ST ₃ in FIG. 3, when the power-on state, thereby transmitting and receiving contacts A ₁
And A ₂ are closed, bypass contact B is opened and the station
ST ₃ is electrically connected between transmission lines RL ₁ and RL ₂ .

In this state, the data processing unit 2 starts the station incorporation process.

That is, first, the selection circuit C is switched to the waveform shaping section 4 side to be in a reception state for a predetermined time, and in this state, the frames F between other stations circulating in the lymphoid network are sequentially captured via the receiver 1. , Through the waveform shaping section 4 and the driver 3 to the transmission line RL ₂ . At this time, by analyzing the frame F captured by the data processing unit 2 and storing different transmission source station numbers SA sequentially in the order of numbers, the existing stations connected to the ring-shaped transmission line RL are recognized.

Then, when a sufficient time has elapsed for transmitting at least once in all the existing stations, the data processing unit 2
The selection circuit C is switched to the data processing section 2 side to be in a transmission state for a predetermined time. In this transmission state, the token and frame F taken in by the data processing unit 2 via the transmission line RL ₁ and the receiver 1 are discarded, and instead, the destination and the source station number created by the data processing unit 2 are discarded. RA and
The frame F in which SA is set to its own station number "3" is added to the token, and this is sent to the transmission RL ₂ via the driver 3. Then, this transmission state continues for a time longer than the time required for at least all the existing stations to transmit the transmission right.

During this time, the transmission right is normally transferred between the existing stations, and the station that has transmitted the transmission right then receives the frame F from the station other than itself.
After that, the receiving state is continued until the frame F in which its own destination, that is, the destination station number SA of its own is stored, is received, while the station which has acquired the transmission right and is transmitting also transmits the token and the frame. It will be in the later reception state. Then, the token and the frame F transmitted from the transmitting station are discarded when they are received by the station ST ₃ , so that the transmitting station does not receive the frame F addressed to itself and the reception state Then, the frame F transmitted from the station ST ₃ is received. In this frame F,
Since the transmission source station number of the newly connected station ST ₃ is stored, all existing stations including the transmitting station can recognize the existence of the newly connected station ST ₃ .

After that, in the transmission state, the token and the frame are discarded, and there is no token that circulates on the ring-shaped transmission line RL, so the newly connected station
The ST ₃ passes the transmission right to the station having the next largest station number among the existing stations recognized in the reception state (in FIG. 5, it transfers the transmission right to the station ST ₆ to complete the incorporation into the network. , The station ST ₂ having the next smaller station number “2” than the station number “3” of the station ST ₃ is the newly connected station S.
Since it recognizes the existence of T ₃ , it will pass the transmission right to the station ST ₃ whose station number is “3”, which is the next higher station number than its own station number “2”. The transmission right is passed at all stations.

In addition, in the above-mentioned embodiment, the case where the predetermined frame F is added to the token when transmitting the data is described, but the present invention is not limited to this, and when the token is received, The present invention can also be applied to the case where the above is held and only a predetermined frame is transmitted.

〔The invention's effect〕

As described above, according to the present invention, the station newly connected to the ring-shaped transmission line confirms the existing stations at the time of connection, and forcibly puts each existing station into the receiving state and newly connected. Since a predetermined frame is transmitted from a station that has been made to recognize its location, there is no need to perform processing related to station connection in the normal state where no new station is connected, and transmission rights can be efficiently moved. Moreover, when a new station is installed, it is easy to send a frame with the source and destination data addressed to itself to other existing stations without any special command. It is possible to make the existing station recognize the incorporation of the new station.

[Brief description of drawings]

FIG. 1 is a block diagram of a bypass state showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of a frame, FIG. 3 is a block diagram showing a receiving state, and FIG. 4 is a block showing a transmitting state. FIG. 5 is a block diagram showing a ring network. In the figure, ST _{1 to} ST _N are stations, RL is a ring-shaped transmission line,
1 is a receiver, 2 is a data processing unit, 3 is a driver, 4 is a waveform shaping unit, A ₁ and A ₂ are contacts for transmission and reception, B is a contact for bypass, and C is a selection circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 58-177055 (JP, A) JP 60-14550 (JP, A) JP 62-15950 (JP, A)

Claims (1)

[Claims] 1. In a token-passing ring network in which a plurality of stations are connected, a data processing unit and a waveform shaping circuit to which data received from a receiver is supplied to the station, and the data processing unit and the waveform shaping. A selection circuit for selecting the output data of the circuit as transmission data and outputting it via the driver is provided, and when the station is newly installed in the ring network, the output data of the waveform shaping circuit is selected by the selection circuit. By monitoring the received data from the receiver with the data processing unit, the existing station recognition process for recognizing other stations already incorporated in the network is performed, and then the output data of the data processing unit is selected by the selection circuit. Talk received from other transmitting stations. In addition, by discarding the frame and continuing the receiving state at the other station that is transmitting, the frame with the source and destination data addressed to itself is transmitted, and a new frame is sent to the other built-in station. A station embedding method in a ring-shaped network, characterized in that a station embedding process for recognizing the incorporation of another station is performed, and then the transmission right is transferred to another station recognized in the reception process.