JPS6143035A - Remote supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To transmit a signal without hindrance even if a part of a transmission line is defective by connecting a master station and plural slave devices to four pairs of duplicated transmission lines via branching devices and allowing the slave stations to use line switches for switching the transmission lines. CONSTITUTION:A terminal station 10 and the slave stations 20, 30 are coupled with transmission lines 301, 401 in the opposite direction as transmission lines 101, 201, outgoing lines 101, 301 and incoming lines 201, 401 are combined respectively by hybrid transformers HB14, 15 at the master station, and the slave stations are coupled by branching sections 40, 50 having HB41-44 and 51-54 respectively. The HB14, 15 at the master station are connected to a transceiver 11 via a modulator M12 and a demodulator D13 respectively and the HB is connected to M22, D23, M32, D33 via line switches SW25, 35 respectively at each slave station. The transmission lines 101, 201 are used normally and when the unarrival of the signal is detected by a demodulator, then the SW25 or 35 is switched and the signal is transmitted/received by using the transmission lines 301, 401.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a remote monitoring and control device, and particularly to a remote monitoring and control device that takes measures against pack-up in the event of a transmission path failure in a polling method.

[Technical background of the invention]

The basic components of polling-type remote monitoring and control equipment (hereinafter referred to as telecontrollers) are as shown in Fig. )20°30, and the distance between them is 2
Connected by a pair (or one pair) of transmission lines 101.201 (connection between each slave station 20.30 and transmission line 101.201 is at branch 4
0,50 heights υttotrans 41.42,51
．． 52 is common. The configuration of the transmitting and receiving parts of the master station and the slave station is as follows:
．． 31, transformer M12, 22, 32 and demodulator D13,
23.3ml as a base, and the slave station is equipped with a □modulator M22,3.
Line switches 24 and 34 are provided between 2 and the hybrid transformer 42.52.

Next, the basic operation of the polling method will be explained. The basic expansion of this method is to use a shared transmission path in a time-sharing manner when transmitting and receiving data between a plurality of slave stations connected to a transmission path and a master station. The master station 10 is for each slave station*0.3G
In order to transmit this information, the following table operations are repeated. That is, when the master station IO obtains information about the slave station 20, for example, it sends a signal to call the slave station 20 from the transceiver 11 to the transmission line 101 via the modulator M12. Each slave station 20.30 receives the paging signal and closes the line switch 24 or 34 if it is a paging signal for its own station. In this case, since the calling signal from the slave station 20 is used, the line switch 24 is closed and only the slave station 20 is connected to the transmission line 201. and slave station 20
Accordingly, information to be transmitted from the transceiver 21 to the master station 10 is transferred via the modulator 22. After the transfer is completed, the slave station 20 opens the line switch 24. On the other hand, master station 1
When 0 finishes receiving information from the slave station 20, it outputs a signal to call the next slave station, for example, slave station 30, and as before, the slave station 3
0 information is transferred. In this way, the polling method calls slave stations one after another and causes them to perform transmission.

[Problems with background technology] Transmission in a teleconverter device having the above configuration.

If a fault occurs in the transmission line, the fault will occur and information from slave stations connected to the transmission line beyond the circle point will not be able to be transmitted. This is l
This is a major problem in a system in which transmission is carried out with multiple slave stations over a transmission line, and therefore requires multiplexing of the transmission lines.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a remote monitoring and control device that can perform transmission without any trouble even when there is a failure at one point in the transmission line in the polling method.

[Summary of the invention]

In the present invention, a duplex system is formed between the master station and each slave station using four pairs of transmission lines and a high-pressure transformer, and on the slave station side, switching is possible using a line switch between each transmission line. It is composed of

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of a remote monitoring and control device according to the present invention. 1st
In the figure, the same parts as in FIG. 2 are given the same reference numerals and the explanation will be omitted.

In FIG. 1, transmission lines 10i and 201 are the same as before, but transmission lines 301 and 401 from the opposite direction are created and connected to each slave station 20 and 30 to form a duplex transmission line. . The master station 10 connects the transmission path in the opposite direction from the master station to the slave station (hereinafter referred to as
A modulator 12 and a demodulator 13 are connected separately from the slave station to the master station (hereinafter referred to as upstream) and from the slave station to the master station (hereinafter referred to as uplink).
is connected to the transmitter/receiver 11 via. Connections between the duplex transmission line and each slave station are made using hybrid transformers 43.44°53.54 in addition to conventional hybrid transformers 41.42.51.52 at the branch section 40.50. Furthermore, each slave station is provided with a transmission path switching section 25, 35 to enable switching between the dual system transmission path and each other. During normal times, one transmission path is determined as the regular system, and all slave stations are configured to be connected to the regular system. Therefore, if both systems of the transmission line or the system in use are normal, all the slave stations are connected to the transmission line of the same system, and transmission is performed using only the transmission line of that system. A case where both systems or one system becomes defective at one location on the transmission line will be described below.

First, during normal operation, both the slave stations 20 and 30 use the transmission path 101.
102, 201, and 202. Now, in this state, if the transmission lines 102 or 102 and 202 between the slave stations 2o and 30 become defective at the same time, the transmission lines 101 and 202 become defective.
Although the slave station 20 connected to the master station 10 can operate normally, the slave station 3o cannot receive the calling signal from the master station 1O, and therefore cannot output information to the upper transmission line 202 of the slave station 3o.

At this time, the master station IO is also unable to receive information from the slave station 30, and detects a defect in the transmission path including the slave station.

Since the detection time by the slave station 30 is set to be shorter than the detection time of the master station, the slave station 30 switches the transmission line changeover switch 35 to connect to another system under the condition that the calling signal of the master station 10 cannot be received. Connect to. Here, since the same calling signal as the above-mentioned defective transmission line 102 is output to the separate transmission line 301 via the hybrid transformer 14 of the master station, the calling signal of the own station (30) can be received. By closing the line switch 34 again, the hybrid
It can be output to the upper transmission line 401 via the transformer 54. At this time, the upper transmission line 401 as well as 301,
Since the input is to the master station 10 via the one-line 201 and the high-priority transformer 15, the master station 10 is connected to the transmission line 102.
Information from the slave station 30 can be normally received regardless of the malfunction of the slave station 30.

Next, the operation when the upper transmission line 202 becomes defective will be explained. In this case as well, slave station 20 operates normally, but slave station 3
0 is called by the master station 10, the slave station 30 correctly responds and outputs information to the transmission line 202. However, since the transmission line 202 is defective, the slave station 30
The information output to the base station 10 cannot be received by the master station 10. Therefore, the master station 10 outputs a command to the slave station 30 to switch the transmission path changeover switch 35 on the premise that the lower transmission path is normal. That is, since the slave station 30 has received the paging signal from the master station 10 and has correctly outputted the information regarding this paging signal to the upper transmission line, it can no longer detect a defect in the upper transmission line. Therefore, in the master station 10, the above-mentioned child'430Kj-mllr! 111
1)l! It detects a defect in the transmission line and outputs a switching command for the transmission line changeover switch 35. The slave station 30 receives this command from the transmission line 102 and switches the transmission line changeover switch 35 to another transmission line. As a result, the slave station 30 performs the same operation as described above, and the slave station 30 connects to the transmission path 301 of another system.
．． Transmission is performed with the master station 10 via 401.

In short, the master station 10 has a dual transmission line via the same modulator and demodulator, and by simply installing a simple transmission line changeover switch in each slave station, the operating rate of the system can be significantly increased. .

FIG. 3 shows an embodiment in which the modulator/demodulator of the master station is duplicated.

That is, the master station 1O omits the high transformer 14.15 shown in FIG.
．． 401 is configured to be directly connected to the modulator 12a #12b% demodulator 13a r i 3b. and two modulators 12&.

The inputs of 12b are connected in common and to the transmit signal of the transceiver 11. Also, the demodulator 13&.

The output of 13b is connected to the received signal of transceiver 11 via OR circuit 16. Therefore, with such a configuration, it has the same function as the independent transformer shown in FIG.

FIG. 4 shows another embodiment of the slave station configuration. □In this embodiment, a modulator and a demodulator are respectively inserted in each transmission path, and the transmission path changeover switch is used to switch between them. This is how it was done.

That is, the received signal is sent to two demodulators 23m (33m).

23 b (33b), and is further input to the transmitter/receiver 21 (31
) is entered. Also, the transmission signal from the transceiver 21 ($1) is sent to two modulators 22 m (32 m) and 22 b (33 b) via the transmission line changeover switch 25 (35).
). The output of each modulator is then connected to the branch section 40 (50) via the line switch 24 (34). This configuration has the same functions as those shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, a duplex configuration is provided between the master station and the slave station using four pairs of transmission lines and a 71-bit hybrid transformer, and the transmission line system on the slave station side is configured to be switchable. Therefore, it is possible to provide a remote monitoring and control device that can switch a slave station to another transmission path when there is a failure in the transmission path, and can significantly increase the operating rate of the system.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of a remote monitoring and control device according to the present invention, FIG. 2 is a configuration diagram of a conventional device, and FIG. 4 is a block diagram of another embodiment of the master station, and FIG. 4 is a block diagram of another embodiment of the slave station. 10.-master station, 20.30...slave station, 1
1.21.31--transmitter/receiver, 12, i2m, 12b-22, 22m, 22bI32.
33m, 33b ''Modulator, IL13m, 13b+2
L23ay23b+3L33m+33b...Demodulator, 14.15.41-44, 51-54...Hybrid transformer, 24, 34...Line switch, 25, 35...Transmission line changeover switch, 16...O
R circuit, 101.102,201,202,301,302,4
01,402...Transmission line. Patent applicant Toshiba Corporation Agent Patent attorney Nori Ishii Figure 1 Figure 2

Claims (1)

[Claims] Connecting the control center equipment and the controlled equipment through a transmission path,
In a polling-type remote monitoring and control device in which the corresponding controlled center devices are sequentially called in response to a call signal from the control center device and transfer information to the master station device, the transmission path is four.
A remote monitoring and control device characterized in that a pair of dual system transmission lines are connected to each device by a brancher, and the slave station device and each transmission line can be switched via a line switch.