JPS62209941A - Supplying system for loop communicating system - Google Patents

Abstract

PURPOSE:To prevent the normal action of a loop network system from being affected by the feeding trouble of a node by connecting a constant voltage diode serially, having a feeding means to supply a constant electric current and providing the constant voltage electric power source different from the above-mentioned supplying means at respective communication control means. CONSTITUTION:A transmitter-receiver 3 of respective nodes is serially connected with a feeding line 2, a constant electric current is conducted from a constant electric current feeding device 5 and a communicating controller 4 of respective nodes is individually supplied from a constant voltage electric power source unit 6. In the normal condition, the transmission and reception of data can be executed through the transmitter-receiver 3 and the communication controller 4 between the signal on a transmission line 1 and the input/output interface 7 of respective nodes. On the other hand, when the constant voltage electric ower source unit 6 of respective nodes is turned off, the function of the communication controller 4 is stopped, the transmitter-receiver 3 receives the constant electric current supply, and therefore, it functions as a reproducing repeater on a transmission line and the function of a loop-shaped network system is normally maintained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a loop network power supply system.

〔overview〕

In a communication system having a loop transmission path, the present invention separates the power supply to each relay means of a node from the power supply supplied to each node to the communication control means between the input/output means and the loop transmission path. By doing this all at once, the operation of the loop transmission line will not be affected even if a local power failure occurs in the communication control means.

[Conventional technology]

As shown in FIG. 3, the loop network system includes a transmitter/receiver 3 that relays and transmits data signals via a loop transmission line 1.
and a communication control device 4 that controls data exchange between the input/output interface 7 of each node and the corresponding transceiver 3.
It consists of

[Problem that the invention seeks to solve]

In the conventional loop network system, the transmitter/receiver and the communication control device adopt an individual constant voltage power supply system in which each node receives power supply, as shown in FIG. therefore,
If a power supply failure occurs at one node on the loop, the entire network system will lose functionality. In order to deal with such failures, the loop is made into a dual system as shown in Figure 4, and one node (the node with diagonal lines)
When a power supply failure occurs, a method is adopted in which two adjacent nodes perform loop bank operations to disconnect the failed node from the loop and maintain system functionality. but,
With this method, system functionality cannot be maintained against secondary failures after a power supply failure occurs. Furthermore, when a transmitter/receiver and a communication control device are installed in a house or an office, it is difficult to provide power supply equipment that can continuously supply electricity, and the power supply often has to be turned off for a certain period of time, such as at night. In such cases, it is impossible to protect the system in the event of a failure using the loopback method described above, and as shown in Figure 5, it is necessary to stop the 1i source at three or more nodes (hatched nodes). In this case, other nodes connected to the power supply are disconnected from the system.

As described above, the conventional power supply system has the disadvantage that the system cannot be protected in the event of a secondary failure after a node power supply failure occurs or a power outage at three or more locations.

The present invention aims to eliminate such drawbacks, and aims to provide a power supply system in which the normal operation of a loop network system is not easily affected by power supply failures at nodes.

[Means for solving problems]

The present invention includes a loop transmission path and a plurality of nodes connected to the loop transmission path, each of which includes a transmitting/receiving means having means for relaying data on the loop transmission path, and a transmitting/receiving means having a means for relaying data on the loop transmission path. and a communication control means inserted between the input/output means connected to this node, each of the above-mentioned transmitting/receiving means is equipped with a constant voltage diode, and the constant voltage diodes are connected in series. and a power supply means for supplying a constant current, and each of the communication control means is provided with a constant voltage power supply separate from the power supply means.

(Operation) The constant voltage diodes provided in the transceivers at each node on the loop are connected in series, and a constant current is supplied from one node to the above-mentioned series-connected constant voltage diodes, thereby powering each transceiver. At the same time, power is supplied to the communication control device using a constant voltage power supply provided individually for each node.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The five nodes are connected in a loop by a transmission path 1, and each node has a transceiver 3 that reproduces and relays data on the transmission path, and an input/output interface 7 at each node and a connection for data exchange between the transceiver 3 and the transceiver 3. and a communication control device 4 that performs the following. Further, the transmitter/receiver 3 of each node is connected in series by a power supply line 2, and a constant current is supplied from a constant current power supply device 5, and the communication control device 4 of each node is connected to a constant voltage power supply device installed at each node. Power is supplied separately from 6.

FIG. 2 is a block configuration diagram showing the configuration of the node. The current flowing through the power supply line 2 is shunted to each circuit part in the transmitter/receiver 3 by constant voltage diodes 8 and 9 in the transmitter/receiver 3, and the voltage necessary for the operation of each circuit part is generated by the constant voltage diodes 8 and 9. be done.

The data signal from the transmission path 1 is regenerated by the receiving circuit 10,
It is distributed to the control circuit 11 and the transmission line code decoding circuit 15.

The capacitors 13 and 14 connected between the transceiver 3 and the communication control device 4 cut off the different circuit reference potentials of the transceiver 3 and the communication control device 4 of each node. On the other hand, the transmission and reception of DC balanced codes such as CMI codes, Manchester codes, and AMI codes used as transmission path codes does not suffer from deterioration in transmission quality even by inserting the capacitors 13 and 14 (it is possible).

The control circuit 11 normally sends the output of the transmission line code encoding circuit 16 to the transmission circuit 12 and transmits the output of the transmission line code encoding circuit 1.
When the output of the receiving circuit 6 is cut off, the output of the receiving circuit 10 is controlled to be sent to the transmitting circuit 12.

The transmitting circuit 12 has a function of transmitting a signal to the transmission line 1.

In such a system, in a normal state, data can be exchanged between the signal on the transmission line l and the human output interface 7 of each node via the transceiver 3 and the communication control device 4. On the other hand, the constant voltage power supply device 6 of each node
If the communication control device 4 is disconnected, the function of the communication control device 4 will stop, but since the transmitter/receiver 3 receives constant current power supply, it will function as a regenerative repeater on the transmission path, and the loop network system will function normally. maintained.

〔Effect of the invention〕

As explained above, the present invention supplies power to the communication control device placed in each node of a loop network system from an individual constant current power supply device, and supplies constant current to the transmitter/receiver of each node placed at one location in the loop. Since it is configured to supply constant current power in series from the power supply device, even if the constant voltage power supply device stops operating at multiple nodes, it is possible to configure a loop network system using nodes other than this node and maintain normal operation. There is an effect that can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment system of the present invention. FIG. 2 is a block configuration diagram showing the configuration of each node in FIG. 1. FIG. 3 is a block configuration diagram showing the configuration of a conventional system.
゛Figure 4 is an explanatory diagram showing the flow of signals when a power supply failure or power outage occurs at one node. FIG. 5 is an explanatory diagram showing the flow of signals when a power supply failure or power outage occurs at two nodes. 1... Transmission line, 2... Power supply line, 3.1 Translation 19...
Transmitter/receiver, 4.17... Communication control device, 5... Constant current power supply device, 6... Constant voltage power supply device, 7... Input/output interface, 8.9... Constant voltage diode, 10
. . . receiving circuit, 11 . . . control circuit, 12 . . . transmitting circuit, 13. 14 . . . capacitor, 15 .

Claims (1)

[Claims] (1) A loop transmission path and a plurality of nodes connected to the loop transmission path, each of which includes a transmitting/receiving means having means for relaying data on the loop transmission path; In a loop communication system comprising an input/output means connected to this node and a communication control means inserted between the input/output means connected to this node, each of the above-mentioned transmitting/receiving means is equipped with a constant voltage diode, and the constant voltage diodes are connected in series. power supply means that supplies constant current