JPH10241086A - Short-circuit detecting method in monitoring system for disaster prevention, monitoring method for disaster prevention using the same and monitoring system for disaster prevention - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system for disaster prevention capable of simplifying internal structure of a repeater and reducing cost of the whole system. SOLUTION: A disaster prevention, receiver 1 is provided with a short-circuit detecting means 15 to detect a short-circuit in a first transmission line L1 and a second transmission line L2, a transmission cut-off means 13 to cut off transmission to all the repeaters 2 when the short-circuit of the transmission lines L1, L2 is detected by the short-circuit detecting means 15 and a repeater connecting means 14 to independently transmit a connection requesting signal of the second transmission line L2 to each repeater 2 through the first transmission line L1. In addition, each repeater 2 is provided with a connection control means 23 to cut the second transmission line L2 when the transmission is cut off by the transmission cut-off means 13 of the disaster prevention receiver 1 and on the other hand, to connect the second transmission line L2 when the connection requesting signal is independently received by the repeater connecting means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a short circuit in a monitoring system for disaster prevention and a monitoring method for disaster prevention using the same. The present invention relates to a disaster prevention monitoring system for preventing transmission failure.

[0002]

2. Description of the Related Art Disaster prevention monitoring systems for monitoring fires, gas leaks, and other abnormalities have been introduced in apartment buildings and buildings. For example, fire detectors installed in each dwelling unit have been installed. If an alarm is issued, a fire receiver installed in the management room etc. will detect this via a repeater, notify the occurrence of a fire, activate the local sound system, and interlock with smoke prevention equipment It can be made to be.

In this type of monitoring system for disaster prevention, when a short circuit occurs in a transmission line connecting a plurality of repeaters or a transmission line connecting a fire detector to each repeater, transmission is disabled in the entire system. There are means to prevent this from happening. That is, by providing this means, it is possible to prevent an excessive short-circuit current from flowing through the transmission line when a short-circuit occurs, thereby preventing a protection fuse provided inside the fire receiver from being blown.

FIG. 3 is a block diagram showing a schematic configuration of a conventional disaster prevention monitoring system having a short-circuit protection function. In this system, the disaster prevention receiver 100 includes a CPU 101
, A transmission device 102, and a short-circuit protection device 103 that shuts off transmission to the transmission line L100 when a short-circuit is detected.
A repeater 200 connected to the receiver 100 via a transmission line L100 includes a CPU 201, a transmission device 202,
203 and a transmission line L20 connecting a plurality of sensors 300
A short circuit protection device 204 that is activated when a short circuit is detected at 0.

[0005] The repeater 200 includes a primary transmission device 202 for transmitting a signal through the receiver 100 and the transmission line L100, and a secondary transmission device 202 for transmitting a signal through each sensor 300 and the transmission line L200. Is provided separately so as to be insulated from each other, even if a short circuit occurs in the transmission line on the secondary side (transmission line L200),
This influence does not affect the primary side (transmission line L100).

That is, even if a short circuit occurs on the secondary side, the short-circuit protection device 204 cuts off the transmission on the secondary side and disconnects only the section constituted by the repeater 2, so that the transmission line L100 Other repeater 200 through the sensor 3
The transmission to 00 can be continued without being affected by the short circuit.

[0007]

However, the conventional disaster prevention monitoring system described above has a repeater provided with two transmission devices on the primary side and the secondary side, and a two-stage short circuit between the repeater and the receiver. Since it is necessary to configure a protection function, there is a problem that a large-scale system including many repeaters is costly.

The present invention has been made in view of such circumstances, and has a disaster prevention monitoring system capable of simplifying the internal structure of a repeater and reducing the cost of the entire system. The purpose is to provide a monitoring method for disaster prevention.

[0009]

According to a first aspect of the present invention, there is provided a method for detecting a short circuit in a disaster prevention monitoring system, comprising the steps of: If a short circuit is detected, the connection between the disaster prevention receiver and the first transmission line, the respective repeaters, and the second
The connection with the transmission line is once disconnected, and then the power is sequentially supplied from the disaster prevention receiver through the first transmission line to each of the repeaters and a control signal is transmitted, so that each of the corresponding repeaters is 2 is connected to the transmission line 2 and the presence or absence of a short circuit is determined by the short circuit detecting means of the disaster prevention receiver.

According to this method, the short circuit of the second transmission line can be detected with a simple system configuration in which a common short circuit detecting means is provided on the receiver side. Here, the short-circuit detection may be performed by a method of detecting a voltage other than directly detecting the current flowing through the transmission line. Claim 2 is a monitoring method for disaster prevention using the short-circuit detection method according to claim 1, wherein the disaster-prevention receiver performs the above-described short-circuit detection method with respect to a repeater determined to be short-circuited. The connection with the second transmission line is disconnected and held, and only the repeaters that are not determined to be short-circuited are sequentially polled. According to this method, the short-circuited second transmission line can be immediately disconnected, and the polling control by another transmission line can be restarted, so that a healthy short-circuited transmission line cannot be monitored.

Claims 3 to 6 propose a disaster prevention monitoring system having a short-circuit protection function. According to the third aspect, the disaster prevention receiver is configured to detect short-circuits in the first transmission line and the second transmission line, and to all the repeaters when the short-circuit detection unit detects a short-circuit in the transmission line. And a repeater connecting means for individually transmitting a connection request signal for the second transmission line to each repeater through the first transmission line. Also, when the transmission is interrupted by the transmission interruption means of the disaster prevention receiver,
A connection control means for connecting the second transmission line when the connection request signal is individually received by the repeater connection means while disconnecting the second transmission line.

When detecting a short circuit, the disaster prevention receiver disconnects the secondary transmission lines of all the repeaters, then sequentially connects the secondary transmission lines individually, and determines the location where the short circuit has occurred. Identify. Claim 4 is a specific configuration of the transmission cut-off means of the disaster prevention receiver. When a short-circuit of the transmission line is detected, the power supply to the first transmission line is cut off, so that all the repeaters can be transmitted. Block transmission. The connection control means of one of the repeaters disconnects the second transmission line when the power supply through the first transmission line is cut off.

According to a fifth aspect of the present invention, a specific operation after the detection of the short circuit is described. The disaster prevention receiver sends a connection request signal of the second transmission line to each repeater individually by the repeater connecting means. At the time of transmission, if the short circuit of the transmission line is detected by the short circuit detection unit, the transmission to all the repeaters is again cut off by the transmission cutoff unit, and the respective second transmission lines are disconnected. The repeater connection means sequentially and individually sends a connection request signal for the second transmission line to all repeaters other than the repeater when the short circuit is detected. By repeating such an operation, it is possible to disconnect only the transmission line in which the short circuit has occurred.

[0014] Claim 6 shows a further detailed operation after the detection of the short circuit. In the disaster prevention receiver, the transmission cutoff means cuts off transmission to all repeaters, and the second transmission line in each repeater. Is disconnected, after confirming that the short-circuit detecting means does not detect the short-circuit of the first transmission line, the repeater connecting means individually transmits a connection request signal of the second transmission line to each repeater. Send out.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of the disaster prevention monitoring system of the present invention. Here, a fire monitoring system using a fire detector will be described as an example of a disaster prevention monitoring system.
The present invention is not limited to this, and any system may be applied as long as one or a plurality of disaster prevention terminals are connected to each of the plurality of repeaters to form a monitoring section for each sensor. In other words, the system of the present invention configures a self-fire alarm system when a fire detector is connected to the repeater, and configures a smoke control system when a smoke prevention device is connected to the repeater.

The illustrated system includes a first transmission line (main line) L1 derived from a fire receiver 1 which is a disaster prevention receiver.
, A plurality of repeaters 2 are connected to each other, and a plurality of fire detectors 3 as disaster prevention terminals are connected to a second transmission line (branch line) L2 derived from each repeater 2. There is a transmission line L1 from the fire receiver 1 to each repeater 2 and the sensor 3
The power supply and the transmission of the control signal are performed through L2.

A unique address (in the figure, “1” to “n” for the sensor 3 and “n + 1” to “m” for the relay 2) is added to the plurality of repeaters 2 and the sensors 3 in advance. During normal monitoring, the operation status of each of the devices 2 and 3 is confirmed by polling or the like from the fire receiver 1, and when the fire detector 3 issues an alarm due to the occurrence of a fire or the like, the fire detector 3 The alarm signal is transmitted to the fire receiver 1 through the second transmission line L2, the repeater 2, and the first transmission line L1, and the fire receiver 1 performs a fire notification and the like.

The fire receiver 1 includes a CPU 11 for controlling signals of the entire system, a transmission device 12 for performing transmission through the first transmission line L1, and a transmission line L1 for detecting a short circuit.
Protection device 13 for blocking transmission to the
Relay connection means 14 for individually transmitting a connection request signal for the second transmission line L2 to each of the plurality of relays 2
And short-circuit detecting means 15.

The short-circuit detecting means 15 detects a short-circuit by a change in the current value in the first transmission line L1 or the second transmission line L2, and when a short-circuit is detected, the short-circuit protection device 13 constituting the transmission cut-off means is used. , The transmission to all the repeaters 2 is cut off, and thereafter, the connection request signal for the second transmission line L2 is sequentially and individually transmitted to each repeater 2 through the first transmission line L1 by the repeater connection means 14. Is sent.
Note that the short-circuit detecting means 15 may be configured to detect a short-circuit based on a change in the voltage value.

Each of the repeaters 2 includes a CPU 21 for signal-controlling each unit in the repeater 2, a transmission device 22 for performing transmission through the first transmission line L1 or the second transmission line L2, Disaster prevention receiver 1 which constitutes the connection control means of the present invention.
When the transmission is interrupted by the short-circuit protection device 13, the second transmission line L2 is disconnected, and when the connection request signal is individually received by the repeater connection means 14, the relay for connecting the second transmission line L2. The circuit 23 is provided.

When the fire receiver 1 detects the short circuit, the fire receiver 1 disconnects the secondary transmission lines (second transmission lines L2) of all the repeaters 2 and then sequentially and individually transmits the secondary transmission lines L2. And check which transmission line has a short circuit.
If the short-circuited transmission line L2 is known, the fire receiver 1
Other secondary transmission lines L2 of the repeater 2 can be connected. That is, even if a short circuit occurs on the secondary side of any of the repeaters 2, only the corresponding transmission line L2 is disconnected,
Fire receiver 1 without bringing down the entire system
And another repeater 2, a sensor 3 connected to the other repeater 2
Can be continued.

Thus, in the monitoring system for disaster prevention according to the present invention, it is only necessary to provide the short-circuit protection device 13 on the receiver 1 side, and the relay 2 side can easily control the connection of the secondary transmission line L2. The short circuit protection function can be exhibited only by providing the relay circuit 22 having a simple configuration. The relay circuit 22 of the repeater 2
When the power supply through the primary transmission line (first transmission line L1) is cut off, the contact automatically opens (OF).
F) It can be easily configured with a single stable relay that disconnects the secondary transmission line L2. In this case, when the power is turned on in the fire receiver 1, a connection request signal is sequentially transmitted from the repeater connecting means 14 to each of the repeaters 2, and
The secondary transmission line L2 is connected to start fire monitoring by each sensor 3. When the CPU 11 of the fire receiver 1 detects a short circuit, the short-circuit protection device 13
, The power supply to the first transmission line L1 is cut off, so that transmission to all the repeaters 2 is cut off.
Of the secondary transmission line L2.

Next, the flowchart of FIG.
The basic operation of the disaster prevention monitoring system of the present invention will be described using 2). During normal monitoring, the fire receiver 1
Although transmission is performed between the transmission device 12 and the transmission device 22 of the repeater 2, when a short circuit between the transmission lines L1 and L2 is detected,
Activate the short-circuit protection device 13 to cut off the power supply. Then, since the power supply to all the repeaters 2 is cut off,
The contacts of the relay circuit 23 are opened, and all the secondary transmission lines L
2 is cut. Next, after a predetermined time, the short-circuit protection circuit 1
When 3 is restored, the power supply is restarted. At this point,
Since the contacts of the relay circuits 23 of all the repeaters 2 remain open and have not received the connection request signal from the repeater connection means 14, the short circuit due to the secondary transmission line L2 is not detected. When the short circuit has occurred in the primary transmission line L1 of No. 2, the short circuit is detected again. In this case, the power supply is again shut off by the short circuit protection circuit 13, and the above operation is repeated (S1 to S5). ).

On the other hand, after confirming that the short circuit of the first transmission line L1 is not detected, the connection request signal (for the second transmission line L2) for each of the repeaters 2 is individually sent to the repeaters 2 by the repeater connection means 14. “Relay ON command” command). Receiving this, the repeater 2 sequentially closes the contact of the relay circuit 23 (ON) and connects the secondary transmission line L2.
When the secondary transmission line L2 of a certain repeater 2 is connected, 2
If a short circuit has occurred in the secondary transmission line L2, the fire receiver 1 detects the short circuit again. In this case, the short circuit protection circuit 13 again shuts off the power supply, and all the relays 2 The secondary transmission line L2 is disconnected, and thereafter, a “relay ON command” is sequentially and individually transmitted from the repeater connection means 14 to all the repeaters 2 except the repeater 2 when the short circuit is detected. By repeating such an operation, a "relay ON command" is sent to the last repeater 2 without detecting a short circuit, the secondary transmission line L2 is connected, and only the short-circuited secondary transmission line L2 is connected. Shut off and perform normal monitoring operation (S6
To S12).

That is, the fire receiver 1 disconnects and holds the connection with the second transmission line L2 to the repeater 2 determined to be short-circuited, and sets the repeater 2 not determined to be short-circuited.
Only the second transmission line L2 is connected. by this,
This system can be returned to the monitoring state in which polling control is sequentially performed from the receiver 1 to the repeater 2 and the sensor 3.

[0026]

As can be understood from the above description, according to the short-circuit detecting method in the disaster prevention monitoring system according to the first aspect, a simple system configuration in which a common short-circuit detecting means is provided only on the receiver side. The short circuit of the second transmission line derived from each repeater can be detected. According to the monitoring method for disaster prevention according to claim 2, the repeater determined to be short-circuited is the second relay.
Is disconnected and held, and only the repeaters that are not determined to be short-circuited are sequentially polled, so that a healthy short-circuited transmission line cannot be monitored.

According to the disaster prevention monitoring system according to the third to sixth aspects, in the third aspect, the disaster prevention receiver disconnects the secondary transmission lines of all the repeaters when detecting the short circuit. After that, the secondary transmission lines are sequentially connected individually, so that it is possible to confirm in which transmission line a short circuit has occurred. Also, in this way, if the location of the occurrence of the short circuit is known, only this section is cut off, so that transmission from the receiver to another repeater or terminal can be restarted without causing an abnormality. Therefore, unlike the related art, there is no need to provide a short-circuit protection device for each of the repeaters, and only one transmission means needs to be provided, so that the cost of the entire system can be reduced as compared with the related art.

According to the present invention, when the short-circuit of the transmission line is detected, the disaster prevention receiver cuts off the power supply to the first transmission line, thereby disconnecting the secondary transmission lines of all the repeaters. I do. As a result, with a simple configuration, it is possible to quickly operate so as to avoid occurrence of a failure due to a short circuit.
In claim 5, after detecting the short circuit, the disaster prevention receiver connects the secondary transmission line to each repeater, and if the short circuit is detected again, it is known that a short circuit has occurred in the secondary transmission line. If the secondary transmission line is connected again to a unit other than the repeater, normal monitoring can be performed while keeping only the transmission line in which the short circuit has occurred.

According to the sixth aspect, after detecting the short circuit, the disaster prevention receiver connects the second transmission line to each repeater after confirming that the short circuit of the first transmission line is not detected. The location where a short circuit occurs can be specified accurately and quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a configuration of a disaster prevention monitoring system according to the present invention.

FIG. 2 is a flowchart showing a basic operation of the disaster prevention monitoring system shown in FIG.

FIG. 3 is a block diagram showing a configuration of a conventional disaster prevention monitoring system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disaster prevention receiver (fire receiver) 13 ... Short circuit protection device 14 ... Repeater connection means 15 ... Short circuit detection means 2 ... Repeater 23 ... Relay circuit 3 ... Disaster prevention terminal (fire detector) L1 ... first transmission line (primary transmission line) L2 ... second transmission line (secondary transmission line)

Claims (6)

[Claims] 1. A disaster prevention receiver having a short-circuit detection means,
And a plurality of repeaters are connected to each other, a second transmission line connected to a fire detector or a smoke prevention device is connected to each of the repeaters, and the first disaster prevention receiver is connected to the first transmission line. In a disaster prevention monitoring system configured to transmit a power supply and a control signal to the fire detector and the smoke control device through a transmission line and a repeater, when the short-circuit detecting means of the disaster prevention receiver detects a short-circuit in the transmission line. The connection between the disaster prevention receiver and the first transmission line and the connection between the respective repeaters and the second transmission line are once disconnected. Power is sequentially supplied to each repeater and a control signal is sent out through the line, and each repeater is connected to the corresponding second transmission line, and the presence or absence of a short circuit is detected by the short circuit detecting means of the disaster prevention receiver. Disaster prevention monitoring system that distinguishes Short-circuit detection method in the arm. 2. The disaster prevention receiver disconnects and holds the connection with the second transmission line to the repeater determined to be short-circuited by executing the short-circuit detection method according to claim 1. And a polling control method for sequentially controlling only the repeaters that are not determined to be short-circuited. 3. A structure in which a plurality of repeaters are connected to a first transmission line derived from a disaster prevention receiver, and a plurality of disaster prevention terminals are connected to a second transmission line derived from each repeater. In the disaster prevention monitoring system, the disaster prevention receiver includes: a short-circuit detection unit configured to detect a short circuit in the first transmission line and the second transmission line; A transmission blocking means for blocking transmission to the repeater, and a second individual to each repeater through the first transmission line.
Relay connection means for sending a transmission line connection request signal, wherein each of the relays disconnects the second transmission line when transmission is interrupted by the transmission interruption means of the disaster prevention receiver. And a connection control means for connecting the second transmission line when a connection request signal is individually received by the repeater connection means. 4. The repeater according to claim 3, wherein the transmission cutoff means of the disaster prevention receiver cuts off a power supply to the first transmission line when detecting a short circuit of the transmission line, so that all the relays are turned off. And the connection control means of each of the repeaters disconnects the second transmission line when the power supply through the first transmission line is interrupted. Monitoring system. 5. The short-circuit detector according to claim 3, wherein the disaster prevention receiver detects the short-circuit when the repeater connection means sends a connection request signal for the second transmission line individually to each repeater. When the short circuit of the transmission line is detected by the means, the transmission to all the repeaters is cut off again by the transmission cutoff means, and the respective second transmission lines are cut off. A monitoring system for disaster prevention, wherein a connection request signal for a second transmission line is sequentially and individually transmitted to all repeaters other than the repeater when the short circuit is detected. 6. The disaster prevention receiver according to any one of claims 3 to 5, wherein the transmission cutoff means cuts off transmission to all repeaters and disconnects a second transmission line in each of the repeaters. When it is determined that the short-circuit detecting means does not detect the short-circuit of the first transmission line, the repeater connecting means individually transmits a connection request signal of the second transmission line to each repeater. A monitoring system for disaster prevention, characterized by sending out a message.