JP2000207654A - Disaster prevention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely secure signal transmission even when any abnormality occurs in a repeater by short-circuitting one transmission line, which is connected to the repeater, to the other transmission line when abnormality in the repeater is detected. SOLUTION: When power supply abnormality is not detected, a relay SW is turned on and the switching contacts of respective switches SW11, 12, 21 and 22 are located on the side of make contact as shown by a dotted line. A signal inputted from a transmission line L11 is outputted through a transmission line extending device 61 to a transmission line L12. When a monitoring circuit detects the power supply abnormality, in a power failure state, for example, the relay SW is switched into off state and the switching contacts of respective SW11, 12, 21 and 22 are switched to the side of break contact as shown by a real line. Thus, the detector system transmission lines L11 and L12 are turned into short-circuitting state through the switches SW11 and SW12, control system transmission lines are turned into short-circuitting state through the switches SW21 and SW22, a bypass route is secured and the signal transmission to the side of next step is prevented from being cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention system, and more particularly to a disaster prevention system suitable for use not only in buildings such as buildings but also in tunnels.

[0002]

2. Description of the Related Art In a general tunnel disaster prevention system, a so-called baseband transmission method is used in which a data signal is transmitted in a form close to a prototype without moving a frequency spectrum of a data signal at a terminal. Since the distance is limited, the inside of the tunnel is divided into districts, and baseband transmission is performed by dispersing with a relay device installed in each district.

FIG. 6 is a configuration diagram schematically showing an example of a conventionally used tunnel disaster prevention system.

In FIG. 1, reference numeral 100A denotes a disaster prevention receiver as a control station, and reference numerals 10001 to 1000n denote a plurality of relay devices installed in each area in the tunnel. A plurality of terminal devices T1 to T6 such as fire detectors, fire extinguishers, and repeaters are connected to these relay devices 10001 to 1000n in a distributed manner. A group of the terminal devices T1 to T3 and a group of the terminal devices T4 to T6 are divided and connected to transmission lines each having a predetermined length, for example, 1 to 2 km in order to support baseband transmission.

The conventional tunnel disaster prevention system having the above-described configuration has the following problems.

[0006] That is, in the baseband transmission by each relay device, a large-scale relay device is required as compared with the direct transmission from the disaster prevention receiver, and some communication path between the relay device and the disaster prevention receiver is required. Must be provided, which has been a factor in increasing the cost of the system.

[0007] Further, since the relay device has built-in control functions and increases the size of the device, there is a problem in the installation space in the case of installation in a tunnel.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is filed by the present applicant as Japanese Patent Application No. 10-8696.
No. 9 is to be improved. According to the present invention, a relay device is provided with a transmission distance extending device for shaping the waveform of a transmission signal flowing through a transmission line and transmitting the shaped signal. However, when power supply to the extension device is interrupted due to an accident or the like in the relay device, there is a possibility that signal transmission may be stopped at that portion.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to increase reliability of a disaster prevention system by ensuring signal transmission even when an abnormality occurs in a relay device. .

[0010]

In a disaster prevention system in which one or more relay devices are cascaded to a transmission line extending from a receiving board, the relay device processes a signal input from one of the transmission lines. A signal processing unit that outputs to the other transmission line, an abnormality monitoring unit that monitors whether or not an abnormality has occurred by monitoring the state of the relay device, and when the abnormality monitoring unit detects an abnormality in the relay device. And a short-circuit portion for short-circuiting the one transmission line and the other transmission line connected to the relay device.

In a disaster prevention system in which one or more relay devices are cascaded to a transmission line extending from a receiving board,
A signal processing unit that processes a signal input from one of the transmission lines and outputs the processed signal to the other transmission line,
An abnormality monitoring unit that monitors the state of the signal processing unit to monitor whether an abnormality has occurred; and the abnormality monitoring unit that is connected to the relay device when the abnormality monitoring unit detects an abnormality in the signal processing unit. A short-circuit portion for short-circuiting one transmission line and the other transmission line is provided.

Further, the abnormality monitoring unit monitors a state of a power supply circuit of the signal processing unit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a relay device 200.
L11 and L12 are detector-based transmission lines each including a pair of electric paths, L21 and L22 are control-system transmission lines each including a pair of electric paths, and lines L11 and L21 are transmission lines extending from a receiver, for example, a control station. Lines L12 and L22 are transmission lines connected to the slave station (terminal equipment) side.
51T, 52T, 53T, and 54T are transmission lines L, respectively.
11, L12, L21, and L22 are a pair of connection terminals connected to each other. Reference numeral 61 denotes a transmission distance extending device as an example of the signal processing unit described with reference to FIG.

SW11, SW12, SW21, SW22
Is a switch as an example of a short-circuit portion, and is actually configured by, for example, a contact of a relay SW. This switch SW11,
The respective primary sides of SW12, SW21, and SW22 are respectively connected to terminals 51T, 52T, 53T, and 54T, make contacts are respectively connected to input terminals and output terminals of the transmission distance extension device 61, and break contacts are connected to switches SW11 and S.
W12 and SW21 and SW22 are connected to each other.

As shown in FIG. 2, the monitoring circuit 71 is controlled by a monitoring circuit for monitoring the state of the power supply circuit 10.
Does not detect the power failure, the relay SW is in the ON state, and the switches SW11, SW12, SW21,
The switching contact of the SW 22 is on the make contact side as shown by a dotted line in FIG. 1. Transmission line extension device 61
Is output to the transmission line L12 via the switch SW12 and transmitted to the next-stage relay device.

On the other hand, when the monitoring circuit 71 detects a power supply abnormality, for example, when a power failure occurs, the relay SW is turned off, and the switches SW11, SW12,.
The switching contacts of SW21 and SW22 are switched to the break contact side as shown by the solid line in FIG. As a result, the detector transmission lines L11 and L12 are connected to the switches SW11 and SW12.
12, the control system transmission line is short-circuited (conductive state) via the switches SW21 and SW22, and for example, a bypass path is secured for the transmission line extension device that has stopped functioning due to a power failure. To prevent the signal transmission to the next stage from being interrupted.

FIG. 2 is a block diagram of one embodiment of the transmission line extension device.

In FIG. 2, reference numerals 1 and 2 denote a pair of transmission lines extending from a control station (disaster prevention receiver) side, 1 denotes a positive transmission line, and 2 denotes a negative transmission line. 1T and 2T are input terminals of the transmission distance extension device connected to the signal transmission lines 1 and 2, respectively, 3 and 4 are a pair of transmission lines connected to the subordinate station (terminal equipment) side, and 3T and 4T are the transmission lines. Output terminals of the transmission distance extending devices connected to the lines 3 and 4, respectively.

Reference numeral 5 denotes a transmission / reception circuit connected between the input terminals 1T and 2T for receiving transmission signals from the control station and the subordinate stations. Reference numeral 6 denotes a transmission / reception circuit connected to the transmission / reception circuit 5 for receiving the received contents. A shaping direction judging unit 7 for judging the signal content by a CPU or the like (not shown) is controlled based on the judgment result of the shaping direction judging unit 6, and connects the transmission line 1 to a waveform shaping circuit 8 described later or This is a shaping circuit switching unit that switches whether to connect to the circuit.

The waveform shaping circuit 8 has a receiving circuit 81 for receiving a transmission signal from the control station, and a transmitting circuit 82 for shaping the waveform of the received signal and transmitting the waveform to the subordinate station. The receiving circuit 81 has, for example, a light emitting diode 8 whose cathode is connected to the input terminal 2T and whose anode is connected to the fixed terminal a of the shaping circuit switching unit 7 via the resistor 81b.
1a.

The transmission circuit 82 includes the light emitting diode 8
A phototransistor 82a for receiving light from 1a;
An output transistor 82b having a base connected to the collector of the phototransistor 82a; a resistor 82c provided between the collector of the output transistor 82b and the power supply terminal + B; And a resistor 82d provided therebetween. The connection point between the collector of the output transistor 82b and the resistor 82c is connected to the output terminal 3T, and the emitters of the phototransistor 82a and the output transistor 82b are both connected to the output terminal 4T.

The light emitting diode 81 as a light emitting element
a and the phototransistor 82a as a light receiving element constitute a so-called photocoupler.

The waveform shaping circuit 9 has a receiving circuit 91 when receiving a response transmission signal from the dependent station side, and a transmitting circuit 92 for shaping the waveform of the received signal and transmitting it to the control station side. The receiving circuit 91 has a cathode connected to the output terminal 4T, and an anode connected to the output terminal 3T via a resistor 91b.
, For example, a light emitting diode 91a.

The transmission circuit 92 is provided with a light emitting diode 9.
A phototransistor 92a for receiving light from 1a;
An output transistor 92b having a base connected to the collector of the phototransistor 92a; a resistor 92c provided between the collector of the output transistor 92b and the power supply terminal + B; And a resistor 92d provided therebetween. The connection point between the collector of the output transistor 92b and the resistor 92c is connected to the fixed terminal b of the shaping circuit switching section 7, and the phototransistor 92a and the output transistor 9 are connected.
The emitters 2b are both connected to the input terminal 2T.

The light emitting diode 91 as a light emitting element
a and a phototransistor 92a as a light receiving element constitute a so-called photocoupler.

Reference numeral 10 denotes a power supply circuit for supplying power to the transmission circuit 82 of the waveform shaping circuit 8 and the transmission circuit 92 of the waveform shaping circuit 9, and the power is supplied to the power supply terminal + B. I have.

The shaping direction judging section 6 and shaping circuit switching section 7 constitute shaping direction control means, and the waveform shaping circuits 8 and 9 constitute waveform shaping means.

Next, the operation will be described with reference to FIG.

Normally (when the power is turned on), the shaping circuit switching section 7 is connected to the waveform shaping circuit 8 via the contact a, and the transmission signal directions of the transmission lines 1 and 2 are from the control station side to the slave station. Side is in a one-way notification control state. Therefore, the operation signal solicited from the control station can be immediately notified to the dependent station.

In the case of the polling / selecting method, after the solicitation operation from the control station, a response operation from the subordinate station is performed. After receiving the solicitation operation, if the connection of the transmission line 1 to the waveform shaping circuit 9 is switched by the shaping circuit switching unit 7 via the contact b, the response operation from the slave station can be notified to the control station. It becomes possible.

Further, the transmission / reception circuit 5 and the shaping direction judging unit 6 receive the end of the response operation from the dependent station, and after the reception is completed, the shaping circuit switching unit 7 switches the connection to the waveform shaping circuit 8 via the contact a. If so, it becomes possible to receive the invitation operation from the control station again. In this way, the transmission control is determined, and the time slot in the transmission direction is allocated according to the content, thereby performing the waveform shaping processing of the bidirectional transmission signal.

Here, the control principle of the shaping direction will be further described with reference to FIG.
This will be described in detail with reference to FIG.

FIG. 3A shows a standard transmission model in the polling / selecting system. The transmission processing of one frame is started by an invitation transmission from the control station, and is completed by the corresponding subordinate station transmitting a response. Becomes

The transmission receiving circuit 5 receives all transmissions on the transmission lines 1 and 2, as shown in FIG.

As shown in FIG. 3C, the shaping direction judging section 6 discriminates whether the transmission content received by the transmission receiving circuit 5 is a control station solicitation or a dependent station response, and performs a corresponding switching control on the shaping circuit switching. Notifying unit 7 and shaping circuit switching unit 7
As shown in (d), the waveform shaping circuit 8 or 9 is connected according to the notification. That is, in the case of solicitation transmission from the control station, the shaping circuit switching unit 7 first connects to the waveform shaping circuit 8 and then switches to the waveform shaping circuit 9 side to perform response transmission from the subordinate station.

By switching connection of these waveform shaping circuits,
The subordinate station can be notified of the invitation transmission from the control station by using the waveform shaping circuit 8 (see FIG. 3E), and the control station can use the waveform shaping circuit 9 to transmit the response transmission from the subordinate station. (See FIG. 3F).

Next, waveform shaping in the waveform shaping circuits 8 and 9 and shaping of a decrease in the peak value will be described with reference to FIG.

Various means are conceivable for shaping the waveform distortion caused when the distance of the transmission line is increased and the decrease of the peak value. In the present embodiment, the waveform shaping circuit 8 shown in FIG. Substantially a circuit model in the waveform shaping circuit 9 (waveform shaping using a photocoupler and a circuit that newly receives power supply from the power supply circuit 10 and improves the peak value)
Is used.

For example, in the waveform shaping circuit 8 of FIG. 1, a predetermined peak value (for example, a voltage level applied to the power supply terminal + B) as shown in FIG. When a rectangular wave output signal is generated, the output signal is distorted due to the capacitance or the like of the transmission line on the way, and its level is also reduced due to line resistance or the like. A signal having a waveform as shown in b) is input. This signal is received as a light signal from the light emitting diode 81a of the receiving circuit 81 in the waveform shaping circuit 8 by the phototransistor 82a of the transmitting circuit 82.

In the transmission circuit 82, a threshold value TH determined by the ON level of the phototransistor 82a and the output transistor 82b is set. Therefore, the signal from the receiving circuit 81 is shaped by the receiving circuit 82, and the output side thereof, that is, between the collector and the emitter of the output transistor 82b has no distortion as shown in FIG. A rectangular wave output signal whose level has been corrected to a peak value corresponding to the voltage level applied to the power supply terminal + B is obtained.

As described above, in the present embodiment, in the baseband transmission of the polling / selecting method,
Conventionally, by shaping the waveform distortion and the decrease of the peak value that occur when the transmission distance is extended, the waveform is shaped within a predetermined time, and the operation solicited from the control station and the response operation from the subordinate station are detected. A general waveform shaping circuit can shape the waveform in bidirectional transmission, and the transmission distance can be easily extended with a simple circuit configuration. Further, only one set of the transmission / reception circuit, the shaping direction determination unit and the shaping circuit switching unit is required.

FIG. 5 is a block diagram showing a case where a plurality of repeaters having the transmission distance extending device of FIG. 2 are used in a transmission line of a tunnel disaster prevention system by connecting a plurality of repeaters, that is, cascade connection.

In the figure, reference numeral 100 denotes a disaster prevention receiver serving as a control station; 2001 denotes a transmission distance extending device connected to the disaster prevention receiver 100 via a pair of transmission lines 11 and 12;
001 to 300n are terminals connected to the transmission lines 11 and 12 (dependent stations such as a fire sensor, a fire extinguisher or a repeater), and 2002 is a transmission distance extending device via a pair of transmission lines 21 and 22. This is a transmission distance extension device connected to 2001.

Reference numerals 4001 to 400n denote terminals (substations such as a fire sensor, a fire extinguisher or a relay) connected between the pair of transmission lines 21 and 22, and 2003 denotes a terminal via a pair of transmission lines 31 and 32. Transmission distance extension device 20
02, a transmission distance extension device connected to
Is a terminal (a dependent station such as a fire sensor, a fire extinguisher or a repeater) connected between the pair of transmission lines 31 and 32,
6001 to 600n are terminals (substations such as a fire sensor, a fire extinguisher or a repeater) connected between the pair of transmission lines 41 and 42. Of course, the number of cascaded transmission distance extension devices can be set arbitrarily according to the length of the tunnel.

In the relay apparatus 200 shown in FIG. 1, L21 and L22 to which control devices such as L11 and L12 hydrants to which fire sensors are connected are separated from L21 and L22.
In U.S.A., the fire sensor and the hydrant are connected to the same transmission line.

Next, the operation will be described.

[0048] Disaster prevention receiver 100 and terminals 3001 to 300
0n is performed directly, but the transmission lines 11 and 2
In the portion close to the transmission distance extending device 2001, the waveform deterioration of the transmission signal becomes large.
In 1, the terminal 4001 to 40 connected between the transmission lines 21 and 22 at the next stage performs a waveform shaping process on the transmission signal.
0n is transmitted. Further, in the portions of the transmission lines 21 and 31 close to the transmission distance extending device 2002, the waveform of the transmission signal deteriorates again.
The terminal 5001 to 500n connected between the transmission lines 31 and 32 of the next stage performs a waveform shaping process on the transmission signal.
And transmission. Here, as the final stage, a transmission distance extending device 2003 is installed, and the transmission lines 41 and 42 of the next stage are installed.
The transmission of the terminals 6001 to 600n connected therebetween is compensated.

The relay device 200n, for example, 2001
In the case where the power supply abnormality occurs, as described with reference to FIG. 1, the switches SW11 and SW12 are switched, so that the transmission line is short-circuited in the relay device 2001, and signal transmission is reliably ensured.

In the above embodiment, the power supply circuit of the relay device is monitored. For example, the signal input state from the transmission line L11 to the transmission line extension device and the signal input state from the transmission line extension device to the transmission line L12 are monitored. The signal output state may be monitored, and if the time difference is large, the switches SW11 to SW22 may be switched to a short circuit state as an apparatus abnormality.

When the relay device has a microcomputer (microcomputer), means for monitoring the microcomputer for abnormalities, for example, a watchdog timer, is provided.
When an abnormality of the microcomputer is detected, it may be determined that the relay device is abnormal, and the switches SW11 to SW22 may be switched to be in a short-circuit state.

[0052]

According to the present invention, in a disaster prevention system in which one or more relay devices are cascaded to a transmission line extending from a receiving board, the relay device processes a signal input from one of the transmission lines. A signal processing unit that outputs to the other transmission line, an abnormality monitoring unit that monitors whether or not an abnormality has occurred by monitoring the state of the relay device, and when the abnormality monitoring unit detects an abnormality in the relay device. And a short-circuit portion for short-circuiting the one transmission line and the other transmission line connected to the relay device. In a disaster prevention system in which more than one relay device is cascaded, the relay device processes a signal input from one of the transmission lines and outputs the processed signal to the other transmission line; State An abnormality monitoring unit that monitors whether or not an abnormality has occurred, and the one transmission line connected to the relay device and the other when the abnormality monitoring unit detects an abnormality in the signal processing unit. By providing a short-circuit portion that short-circuits the transmission line, and even if an error occurs in the relay device, it is possible to reliably secure signal transmission, and as a disaster prevention system, The purpose is to increase reliability.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram showing the first embodiment of the present invention.

FIG. 3 is a diagram for describing a control principle of a shaping direction according to the embodiment of the present invention.

FIG. 4 is a diagram for explaining a waveform distortion and a shaping operation of a decrease in a peak value thereof according to the first embodiment of the present invention;

FIG. 5 is a configuration diagram showing a second embodiment of the present invention.

FIG. 6 is a configuration diagram schematically showing an example of a conventional disaster prevention system.

[Explanation of symbols]

1,2,3,4,11,12,21,22,31,3
2, 41, 42, L11, L12, L21, L22 transmission line, 5 transmission reception circuit, 6 shaping direction determination unit, 7
Shaping circuit switching unit, 8, 9 Waveform shaping circuit, 10 power supply circuit, 61, 2001 to 2003 Transmission distance extension device, 71 monitoring circuit, 100 disaster prevention receiver, 3001 to
300n, 4001-400n, 5001-500n, 60
01-600n terminal, 51T, 52T, 53T, 54
T connection terminal

Continued on front page F-term (reference) 5C087 AA02 BB11 BB73 CC02 CC12 CC22 DD04 DD23 DD28 EE08 FF01 FF03 GG70 GG84 5G405 AA03 CA14 CA19 CA20 DA02 DA11 DA21 FA25 5K033 AA06 BA08 BA11 DA01 DA03 DA11 EA03 EA04 DC04 A03 EB08 GB05 HA03 HA04 HA06

Claims (3)

[Claims] 1. A disaster prevention system in which one or more relay devices are cascade-connected to a transmission line extending from a receiving board, wherein the relay device processes a signal input from one of the transmission lines and processes the other transmission line. A signal processing unit that outputs a signal to the relay device; an abnormality monitoring unit that monitors whether the relay device is in an abnormal state to monitor whether an error has occurred; and the relay device when the abnormality monitoring unit detects an error in the relay device. And a short-circuit section for short-circuiting the one transmission line and the other transmission line connected to the first and second transmission lines. 2. A disaster prevention system in which one or more relay devices are cascade-connected to a transmission line extending from a receiving board, wherein the relay device processes a signal input from one of the transmission lines and processes the other transmission line. A signal processing unit that outputs the signal processing unit, an abnormality monitoring unit that monitors whether or not an abnormality has occurred by monitoring the state of the signal processing unit; and an error monitoring unit that detects when the abnormality monitoring unit detects an abnormality in the signal processing unit. A disaster prevention system, comprising: a short-circuit portion that short-circuits the one transmission line and the other transmission line connected to a relay device. 3. The disaster prevention system according to claim 2, wherein the abnormality monitoring unit monitors a state of a power supply circuit of the signal processing unit.