JPS6179339A - Controlling system of node assembling - Google Patents

Abstract

PURPOSE:To lighten the load of a communication system of an annular transmission line for assembling in a node drifted away from the system, by setting prescribed assembling-in requesting information in a communication frame and repeating the information and, when the information is detected by a monitor device, causing the device to start the node assembling-in process. CONSTITUTION:A communication frame has an assembling-in requesting section 32 between a header section 30 and data section 31 and the section 32 is composed of a used bit section 33 and address section 34. Upon detecting the requesting section 32 from the count value of a slot counting section 9, a comparator section 8 informs a control section 10 of the detection and the control section 10 inspects the used bit section 33 and, when the used bit is '1', causes the communication frame to be repeated as it is. Upon receiving the communication frame, a monitor device starts assembling-in process for assembling the node of the address which is the content of the address section 34 in the communication system. At the node making the assembling-in request, the time slot number of its own node is set in the register 12 of the comparator section 8 from the control section 10 when the reception of a communication cable, etc., is completed by the assembling-in process, and a communicatable condition is set. Therefore, the load of the communication system of an annular transmission line for assembling in a node which is drifted away from the system is lightened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication system using a circular transmission path, and more particularly to an embedded control method for incorporating a node recovered from a failure into the communication system and restoring the system.

In a communication system using a circular transmission line, each node usually has a so-called bypass function, and if a certain node becomes an obstacle in the transmission line during operation of the communication system, the node's bypass function is By switching the relay route that passes through the route to a direct bypass route, the circular transmission route is reconfigured, and the communication of nodes other than the faulty node is reduced to mm.
It can be so.

In this way, when a node that has left the communication system due to the bypass recovers from a failure, it is desirable to be able to incorporate it into the communication system and start communication as soon as possible.

[Conventional technology]

FIG. 2 shows an example of the configuration of a communication system, in which a monitoring device 21
and nodes 22-1 to 22-9 are connected in a ring through a transmission line to form a communication system.

When the system starts operating, the monitoring device 21 transmits to each node 22-1 to 22-9 a so-called communication table consisting of terminal addresses and various attributes regarding terminals connected to each node and communication partner terminals. It has functions such as starting up each node, monitoring signals during communication, generating communication frames in a predetermined format, and adjusting and relaying required delay times.

The communication frame has the structure shown in FIG. 3, for example, and includes a header section 30 and a data section 31 consisting of a plurality of time slots.

The header section 30 of the communication frame consists of, for example, a synchronization code and a control information section.
It is used to transmit control information and responses thereto between the terminals 2-1 to 22-9.

FIG. 4 is a block diagram showing an example of the configuration of nodes 22-1 to 22-9.

When the nodes are in a communicable state, the signal from the transmission line 40 is received by the receiving circuit 1, demodulated by the demodulating circuit 2, and then
The parallel conversion circuit 15 converts the bit serial signal into, for example, a byte serial signal, passes through the buffers 16 and 17, and the parallel/serial conversion circuit 18 converts the signal into a bit serial signal, which is then input to the modulation circuit 5 via the switch 4, and then to the transmission circuit. 6 to the transmission line 41.

A communication frame of the received signal is detected by a frame synchronization circuit 3, and information within the frame is processed in synchronization with the communication frame.

The slot counter 9 counts the number of time slots following the header section 30 of the communication frame, and transmits the counted value to the comparator 8.

The comparison unit 8 has a slot number assigned to its own node set therein, and if the number received from the slot counting unit 9 is the own slot number, it sends a match signal to the control unit 10.

When the control section 10 receives the matching signal, it controls the line correspondence section 13 to relay the received data of the corresponding slot to the terminal bag W14.

When there is data to be transmitted from the terminal device 14, when the slot assigned to the own node is detected as described above, the line correspondence section 13 is controlled to transfer the data from the terminal device 14 to the buffer 16, 17 and parallel/serial conversion. It is transmitted by setting the register of the circuit 18 in synchronization with the timing of the time slot.

When the abnormality detection unit 43 detects that the communication frame cannot be normally relayed to the above-mentioned route due to a failure such as a power failure of a node, the switch 4 is switched and the parallel/serial conversion circuit 1 is activated.
8, and a bypass path is set in which the output of the demodulation circuit 2 is directly transmitted via the modulation circuit 5.

This bypass route setting is maintained until the switch 4 is reset to the normal side under control from the control unit 10, and during this time, this node is in a state separated from the communication system.

The monitoring device 21 separately monitors the status of each node, and when a node in a detached state occurs, it notifies each node of communication table reconfiguration information.

Also, commands are periodically transmitted to nodes in a detached state.

Once the fault is repaired and the node becomes operational, the node in the departed state remains on bypass and monitors the received signal. When the command from the monitoring device 21 is detected in this state, the bypass is canceled in synchronization with the relay of the next communication frame, and response information to the monitoring device 21 is transmitted in this frame.

Upon receiving this response information, the monitoring device 21 starts processing such as setting a communication table for the note and notifying communication table reconfiguration information of each node.

If the detached notebook has not recovered, the monitoring device 21 does not receive the response information after issuing the command, so it transmits the command again after a predetermined time and repeats this until it obtains the response information.

[Problem that the invention seeks to solve]

In the above control system, even when a plurality of nodes are in a detached state, the detached node incorporation procedure is performed one node at a time using the header section 30 of the communication frame.

Therefore, regardless of when the node becomes ready for installation, processing is performed in the order in which commands are sent from the monitoring device, so there is a problem that the installation time is delayed.

Furthermore, in the monitoring device, commands must be sent periodically until the node recovers to a state in which it can be installed, so there is a problem in that the processing load increases.

[Means for solving problems]

The problem described above is that a monitoring device and a plurality of nodes are connected by a ring transmission path, and the nodes are configured to communicate with each other using communication frames in a predetermined format transmitted through the ring transmission path, and the nodes In a communication system having means for bypassing a node and leaving the ring transmission path, when the node returns from the detached state to a state where it is incorporated into the communication system, predetermined embedding request information is added to the communication frame. The problem can be solved by the node integration control method of the present invention, in which the monitoring device is configured to start the integration process of the node when the monitoring device detects the integration request information.

[Effect]

That is, the node that has recovered to a state where it can be incorporated cancels the bypass at an appropriate timing, and uses a predetermined portion of the communication frame to transmit a 3; embedding request to the monitoring device.

However, the normal communication process does not start for No. 1-, and henceforth "-"
After the processing, the communication frame is simply relayed on standby.

When the monitoring device receives the embedding request, it starts embedding processing similar to the conventional one, such as setting a communication table for the corresponding node.

Therefore, if each no) is restored to the embeddable state,
Unless two or more nodes recover at the same time, a request can be issued immediately to start +fPi, v inclusion processing, and the monitoring device will not generate any load until it receives the request.

〔Example〕

FIG. 1 ta+ is a block diagram showing the configuration of a notebook according to an embodiment of the present invention. In the figure, the same parts as in FIG. 4 are designated by the same reference numerals.

Assume that the notebook bypasses the communication system due to a failure and is disconnected from the communication system, as in the past.

When the state recovers from this state and starts operation, the control section 10 controls the switch 4 in synchronization with the frame boundary detection of the frame synchronization circuit 3, turns off the bypass, and the serial/parallel conversion circuit 15, The communication frame is switched to be relayed through the path of the sofa 6.17 and the parallel/serial conversion circuit 18.

Further, the register 2 of the comparator 8 is set to detect the embedding request part of the communication frame.

The communication frame has, for example, the configuration shown in FIG. It consists of an address section 34.

When the comparison unit 8 detects the /J integration requesting unit 32 based on the count value of the slot counting unit 9, it notifies the control unit 10.
0 checks its use bit 33 and if it is "1", the communication frame is relayed as is.

If the used bit 33 is “0”, the control unit 1
0 is a embedding request, which sets the own node address in the address field 34, sets the use bit 33 to "1°," and relays it.

When the monitoring device 21 receives this communication frame, it starts an installation process to incorporate the address node, which is the contents of the address section 34, into the jmm system.

This embedding process is the same as the conventional one, but during this time the use bit 33 remains at 1, and when the embedding process is completed, the usage hint is reset to 0.

When the use bit 33 becomes 0, it becomes possible to request the incorporation of another note.

When the node that made the embedding request completes receiving the communication table, etc. through the N1 embedding process, the control unit 10 sets the time slot number of its own node 1- in the register]2 of the comparing unit 8, and the node is ready for communication. become a state.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the load of processing to incorporate a node that has left the system in a communication system using a circular transmission line is reduced, and recovered notes are immediately incorporated and processed. This has a significant industrial effect of improving the availability of communication systems.

[Brief explanation of drawings]

Figure 1 fat is a block diagram of the configuration of one embodiment of the present invention.
Figure (bl is a configuration diagram of a communication frame, Figure 2 is a configuration diagram of a communication system, Figure 3 is a configuration diagram of a conventional communication frame, and Figure 4 is a block diagram of a configuration of a conventional node. is a receiving circuit, 3 is a frame synchronization circuit, 4 is a switch, 6 is a transmitting circuit, 8 is a comparison section,
9 is a slot counting section, 10 is a control section,
12 is a register, 13 is a line corresponding section, 14 is a terminal device, 15 is a serial/parallel conversion circuit, 16.17 is a buffer, 18 is a parallel/serial conversion circuit, 21 is a monitoring device, 22-
1 to 22-9 are nodes, 30 is a header section, 31 is a data section, and 32 is an embedding request section.

Claims (1)

[Claims] A monitoring device and a plurality of nodes are connected by a ring transmission path, and the nodes communicate with each other using communication frames in a predetermined format transmitted through the ring transmission path, and each node bypasses its own node and performs the ring transmission. In a communication system having a means for detaching from a network, when the node returns from the detached state to a state in which it is incorporated into the communication system, predetermined incorporation request information is set and relayed in the communication frame, and the monitoring 1. A node installation control system, wherein the device is configured to start installation processing of the node when the device detects the installation request information.