JP3622401B2 - Method of detecting short circuit in monitoring system for disaster prevention, monitoring method for disaster prevention using the same, monitoring system for disaster prevention - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a short-circuit detection method in a monitoring system for disaster prevention, a monitoring method for disaster prevention using the same, and a monitoring for disaster prevention that uses these methods to cut only the transmission line in the short-circuited section and prevent transmission failure of the entire system. About the system.
[0002]
[Prior art]
Conventionally, monitoring systems for disaster prevention that monitor abnormalities such as fire occurrence and gas leaks have been introduced in apartment houses and buildings, for example, if fire detectors installed in each dwelling unit report, A fire receiver installed in a manager's room, etc., detects this through a repeater, notifies the occurrence of a fire, and activates the district sound device or interlocks smoke prevention equipment. It has become.
[0003]
In this type of disaster monitoring system, when a short circuit occurs in a transmission line that connects multiple repeaters, or a transmission line that connects a fire detector to each repeater, the entire system cannot transmit. There are means to prevent it. In other words, the provision of this means prevents an excessive short circuit current from flowing through the transmission line when a short circuit occurs, and the protective fuse provided inside the fire receiver from being blown.
[0004]
FIG. 3 is a block diagram showing a schematic configuration of a conventional monitoring system for disaster prevention provided with 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 blocks transmission to the transmission line L100 when a short circuit is detected. The receiver 100 is provided with the transmission line L100. The repeater 200 connected via the CPU 200 includes a CPU 201, transmission devices 202 and 203, and a short-circuit protection device 204 that operates when a short circuit is detected in the transmission line L 200 connected to the plurality of sensors 300. .
[0005]
The repeater 200 includes a primary-side transmission device 202 for transmitting signals through the receiver 100 and the transmission line L100, and a secondary-side transmission device for transmitting signals through the sensors 300 and the transmission line L200. 203 is separately provided so as to be insulated, so that even if a short circuit occurs in the secondary transmission line (transmission line L200), this influence does not reach the primary side (transmission line L100). It has become.
[0006]
In other words, even if a short circuit occurs on the secondary side, the short circuit protection device 204 blocks the transmission on the secondary side and disconnects only the section that the repeater 2 configures. The transmission to the repeater 200 and the sensor 300 can be continued without being affected by the short circuit.
[0007]
[Problems to be solved by the invention]
However, since the conventional monitoring system for disaster prevention needs to have two transmission devices on the primary side and the secondary side in the repeater and to configure a two-stage short-circuit protection function with the repeater and the receiver. In a large-scale system having many repeaters, there is a problem that costs are high.
[0008]
The present invention has been made in view of such circumstances, and a disaster prevention monitoring system capable of simplifying the internal configuration of the repeater and reducing the cost of the entire system, a short-circuit detection method used therefor, and disaster prevention The purpose is to provide a monitoring method.
[0009]
[Means for Solving the Problems]
The short-circuit detection method according to claim 1 of the present invention proposed for achieving the above object is a disaster prevention monitoring system, wherein the short-circuit detection means of the disaster-prevention receiver detects a short-circuit in the transmission line. The connection between the receiver and the first transmission line, the respective repeaters and the connection with the second transmission line are once disconnected, and then each repeater is sequentially passed from the disaster prevention receiver through the first transmission line. And supplying a power supply to each of them, sending a control signal, connecting each repeater to the corresponding second transmission line, and determining the presence or absence of a short circuit by the short circuit detecting means of the disaster prevention receiver.
[0010]
According to this method, the short-circuit detection of the second transmission line can be performed with a simple system configuration in which a common short-circuit detection unit 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, and the disaster prevention receiver is configured to perform a short circuit detection method on the repeater determined to be a short circuit. 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, since the short-circuited second transmission line can be immediately disconnected and polling control by another transmission line can be resumed, a healthy transmission line that is not short-circuited does not become unmonitorable.
[0011]
Claims 3 to 6 propose a disaster prevention monitoring system having a short-circuit protection function.
In claim 3, when the disaster prevention receiver detects a short circuit in the first transmission line and the second transmission line, and detects a short circuit in the transmission line by the short circuit detection means, to all repeaters Transmission interruption means for interrupting transmission of the second transmission line, and relay connection means for sending a connection request signal for the second transmission line individually to each repeater through the first transmission line. Each repeater disconnects the second transmission line when transmission is interrupted by the transmission interrupting means of the disaster prevention receiver, while the second relay line disconnects the second transmission line when receiving the connection request signal individually by the repeater connecting means. Connection control means for connecting the transmission line is provided.
[0012]
If the disaster prevention receiver detects a short circuit, the secondary transmission line of all the repeaters is disconnected, and then the secondary transmission line is individually connected to identify the location where the short circuit has occurred. 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 to all repeaters. Block transmission. The connection control means of each repeater disconnects the second transmission line when power supply through the first transmission line is interrupted.
[0013]
Claim 5 is the structure which showed the specific operation | movement after a short circuit detection, and when a disaster prevention receiver sends the connection request signal of a 2nd transmission line separately with respect to each repeater by the repeater connection means In addition, when a short circuit of the transmission line is detected by the short circuit detecting means, transmission to all the repeaters is interrupted again by the transmission interrupting means, and the respective second transmission lines are disconnected, and then connected to the repeater. By means, the second transmission line connection request signal is sequentially sent to all the repeaters other than the repeater when the short circuit is detected. By repeating such an operation, it is possible to cut only the transmission line in which the short circuit has occurred.
[0014]
Claim 6 shows a more detailed operation after the short circuit is detected. In the disaster prevention receiver, the transmission cut-off means cuts off the transmission to all the repeaters and disconnects the second transmission line in each repeater. In such a case, after confirming that the short circuit detection means does not detect a short circuit of the first transmission line, the connection request signal for the second transmission line is sent to each relay individually by the relay connection means.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a main configuration of a monitoring system for disaster prevention according to the present invention. Here, a fire monitoring system using a fire detector will be described as an example of a disaster prevention monitoring system. However, the present invention is not limited to this, and one or a plurality of disaster prevention terminals are provided for each of a plurality of repeaters. This is applicable to any system in which a monitoring section is formed for each sensor. In other words, the system of the present invention constitutes a self-fire reporting system when a fire detector is connected to the repeater, and constitutes a smoke prevention control system when a smoke prevention device is connected to the repeater.
[0016]
In the illustrated system, a plurality of repeaters 2 are connected to a first transmission line (trunk line) L1 derived from a fire receiver 1 that is a disaster prevention receiver, and further, a second derived from each repeater 2 is connected. The transmission line (branch line) L2 is connected to a plurality of fire detectors 3 as disaster prevention terminals, and the transmission lines L1, L2 are connected from the fire receiver 1 to each repeater 2 and the sensor 3. Through this, power supply and control signal transmission are performed.
[0017]
A plurality of repeaters 2 and sensors 3 are preliminarily assigned unique addresses (in the figure, "1" to "n" for sensor 3, and "n + 1" to "m" for repeater 2), During normal monitoring, the operation status of each device 2 and 3 is confirmed by polling from the fire receiver 1, and when the fire detector 3 is triggered due to the occurrence of a fire, the fire detector 3 receives a fire. The alarm signal is transmitted to the machine 1 through the second transmission line L2, the repeater 2, and the first transmission line L1, and the fire receiver 1 performs a fire alarm or the like.
[0018]
The fire receiver 1 includes a CPU 11 that performs signal control of the entire system, a transmission device 12 that performs transmission through the first transmission line L1, and a short-circuit protection device that blocks transmission to the transmission line L1 when a short circuit is detected. 13, a relay connection means 14 for sending a connection request signal for the second transmission line L2 individually to each of the plurality of repeaters 2 through the transmission device 12, and a short circuit detection means 15.
[0019]
The short circuit detection 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 interruption means The transmission to the repeater 2 is interrupted, and then the connection request signal for the second transmission line L2 is sequentially sent to each repeater 2 sequentially through the first transmission line L1 by the repeater connection means 14. . In addition, the short circuit detection means 15 can also be configured to detect a short circuit by a change in voltage value.
[0020]
Each repeater 2 includes a CPU 21 that controls each part of the repeater 2, a transmission device 22 for performing transmission through the first transmission line L1 or the second transmission line L2, and the present invention. When the connection control means is configured and the transmission is interrupted by the short-circuit protection device 13 of the disaster prevention receiver 1, the second transmission line L2 is disconnected while the connection request signal is individually received by the repeater connection means 14. The relay circuit 23 for connecting the second transmission line L2 is provided.
[0021]
If the fire receiver 1 detects a short circuit, the secondary transmission line L2 of all the repeaters 2 is disconnected and then the secondary transmission line L2 is connected individually and sequentially. Check which transmission line has a short circuit. Moreover, if the transmission line L2 short-circuited is known, the fire receiver 1 can connect the secondary side transmission line L2 of the repeater 2 other than this. That is, even if a short circuit occurs on the secondary side of any one of the repeaters 2, the fire receiver 1 and the other repeaters 2, without disconnecting only the corresponding transmission line L2 and bringing down the entire system, Transmission with the sensor 3 connected to the other repeater 2 can be continued.
[0022]
Thus, in the disaster prevention monitoring system of the present invention, it is only necessary to provide the short-circuit protection device 13 on the receiver 1 side, and a simple configuration for controlling the connection of the secondary transmission line L2 also on the repeater 2 side. A short-circuit protection function can be exhibited simply by providing the relay circuit 22.
Note that the relay circuit 22 of the repeater 2 automatically opens (OFF) when the power supply through the primary transmission line (first transmission line L1) is cut off, and the secondary transmission line. It can be easily configured with a single stable relay that disconnects L2. In this case, when the fire receiver 1 is turned on, a connection request signal is sequentially sent from the repeater connection means 14 to each repeater 2 to connect the secondary transmission line L2 of the repeater 2. Fire monitoring by each sensor 3 is started, but when the CPU 11 of the fire receiver 1 detects a short circuit, the short circuit protection device 13 shuts off the power supply from the transmission device 12 to the first transmission line L1. The transmission to all the repeaters 2 is cut off, and the secondary transmission line L2 of each repeater 2 is disconnected.
[0023]
Next, the basic operation of the disaster prevention monitoring system of the present invention will be described using the flowchart (S1 to S12) of FIG.
The fire receiver 1 performs transmission between the transmission device 12 and the transmission device 22 of the repeater 2 during normal monitoring. When the short circuit of the transmission lines L1 and L2 is detected, the fire receiver 1 Operates and shuts off power supply. Then, since the power supply to all the repeaters 2 is interrupted, the contacts of the relay circuit 23 are opened, and all the secondary transmission lines L2 are disconnected. Next, when the short circuit protection circuit 13 is restored after a certain time, the power supply is resumed. At this time, since the contacts of the relay circuits 23 of all the repeaters 2 remain open and no connection request signal is received from the repeater connection means 14, a short circuit due to the secondary transmission line L2 is not detected. However, when a short circuit occurs in the primary transmission line L1 of the repeater 2, the short circuit is detected again. In this case, the power supply is shut off again by the short circuit protection circuit 13, and the above operation is repeated. (S1-S5).
[0024]
On the other hand, after confirming that the short circuit of the first transmission line L1 is not detected, the connection request signal (“relay ON”) of the second transmission line L2 is individually transmitted to each relay 2 by the relay connection means 14. Command ”). Receiving this, the repeater 2 sequentially closes the contact of the relay circuit 23 (ON) and connects the secondary transmission line L2, but when the secondary transmission line L2 of a certain repeater 2 is connected, If a short circuit occurs in the secondary transmission line L2, the short circuit is detected again on the fire receiver 1 side. In that case, the power supply is shut off again by the short circuit protection circuit 13, and all the repeaters 2 are connected. The secondary-side transmission line L2 is disconnected, and thereafter, a “relay ON command” is sequentially sent from the repeater connection means 14 to all the repeaters 2 other than the repeater 2 when a 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 shorted secondary transmission line L2 is connected. Shut off and perform a normal monitoring operation (S6 to S12).
[0025]
That is, the fire receiver 1 disconnects and holds the connection with the second transmission line L2 for the repeater 2 determined to be short-circuited, and only transmits the repeater 2 that has not been determined to be short-circuited to the second transmission. Connect the line L2. As a result, this system can be returned to a monitoring state in which polling control is sequentially performed from the receiver 1 to the repeater 2 and the sensor 3.
[0026]
【The invention's effect】
As can be understood from the above description, according to the short-circuit detection method in the disaster prevention monitoring system according to claim 1, each relay has a simple system configuration in which a common short-circuit detection means is provided only on the receiver side. A short circuit of the derived second transmission line can be detected.
According to the monitoring method for disaster prevention according to claim 2, the repeater determined to be short-circuited keeps the connection with the second transmission line disconnected, and only the repeaters not determined to be short-circuited are sequentially polled. Therefore, a healthy transmission line that is not short-circuited does not become unmonitorable.
[0027]
Moreover, according to the monitoring system for disaster prevention of Claims 3-6, in Claim 3, if the disaster prevention receiver detects the short circuit, after making the secondary transmission line of all the repeaters cut, Since the secondary transmission lines are sequentially connected individually, it is possible to confirm in which transmission line a short circuit has occurred. In addition, if the occurrence location of the short circuit is known in this way, only this section can be cut, and transmission from the receiver to other repeaters and terminals can be resumed without causing an abnormality. Therefore, it is not necessary to provide a short-circuit protection device for each repeater as in the prior art, and only one transmission means is provided, so that the cost of the entire system can be reduced as compared with the prior art.
[0028]
In claim 4, when the short-circuit of the transmission line is detected, the disaster prevention receiver cuts off the secondary transmission lines of all the repeaters by cutting off the power supply to the first transmission line. Thereby, it is possible to operate with a simple configuration so as to avoid a failure due to a short circuit quickly.
In claim 5, after the short-circuit detection, the disaster prevention receiver connects the secondary transmission line to each repeater, and if the short-circuit is detected again, the secondary-side transmission line is found to be short-circuited. If the secondary transmission line is connected again to other than this repeater, normal monitoring can be performed with only the transmission line in which the short circuit has occurred being disconnected.
[0029]
In claim 6, since the disaster prevention receiver confirms that the short circuit of the first transmission line is not detected after the short circuit is detected, the second transmission line is connected to each repeater. The location where a short circuit occurs can be identified 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 the basic operation of the disaster prevention monitoring system shown in FIG. 1;
FIG. 3 is a block diagram showing a configuration of a conventional disaster prevention monitoring system.
[Explanation of symbols]
1 ... Disaster prevention receiver (fire receiver)
DESCRIPTION OF SYMBOLS 13 ... Short-circuit protection device 14 ... Relay device connection means 15 ... Short-circuit detection means 2 ... Relay device 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)

A second transmission line in which a first transmission line is led out from a disaster prevention receiver provided with a short-circuit detection means and a plurality of repeaters are connected, and a fire detector and a smoke prevention device are connected to each of the repeaters. In a disaster prevention monitoring system configured to send a power supply and a control signal from the disaster prevention receiver through the first transmission line and repeater to the fire detector and smoke prevention device,
When the short circuit detection means of the disaster prevention receiver detects a short circuit of the transmission line,
Disconnecting the connection between the disaster prevention receiver and the first transmission line, and the connection between each repeater and the second transmission line,
Next, the disaster prevention receiver sequentially supplies power to each repeater through the first transmission line and sends a control signal to connect each repeater to the corresponding second transmission line. A short-circuit detection method in a monitoring system for disaster prevention, wherein the presence or absence of a short-circuit is determined by a short-circuit detection means of a disaster prevention receiver. The disaster prevention receiver disconnects and maintains the connection with the second transmission line for the repeater determined to be short-circuited by executing the short-circuit detection method according to claim 1, and is determined to be short-circuited. A monitoring method for disaster prevention, characterized in that polling control is sequentially performed only on the repeaters that are not present. In a monitoring system for disaster prevention 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 ,
The disaster prevention receiver includes a short-circuit detecting means for detecting a short circuit in the first transmission line and the second transmission line,
When the short circuit of the transmission line is detected by the short circuit detection means, transmission interruption means for interrupting transmission to all repeaters,
A relay connection means for sending a connection request signal for the second transmission line individually to each relay through the first transmission line;
Each of the repeaters disconnects the second transmission line when transmission is interrupted by the transmission interrupting means of the disaster prevention receiver, while when the connection request signal is individually received by the repeater connecting means, A monitoring system for disaster prevention comprising connection control means for connecting a second transmission line. In claim 3,
When the transmission cut-off means of the disaster prevention receiver detects a short circuit of the transmission line, the transmission to all the repeaters is cut off by cutting off the power supply to the first transmission line,
The monitoring system for disaster prevention, wherein the connection control means of each repeater disconnects the second transmission line when power supply through the first transmission line is cut off. In claim 3 or 4,
When the disaster prevention receiver sends a connection request signal for the second transmission line individually to each repeater by the repeater connection means, when the short-circuit detection means detects a short-circuit of the transmission line,
Again, the transmission cut-off means cuts off the transmission to all the repeaters, disconnects each second transmission line, and then the repeater connection means other than the repeater when the short-circuit is detected A monitoring system for disaster prevention, characterized in that a connection request signal for the second transmission line is sequentially sent to all repeaters. In any one of Claims 3-5,
The disaster prevention receiver, when the transmission cutoff means cuts off transmission to all repeaters, and when the second transmission line is disconnected at each repeater,
After confirming that the short circuit detection means does not detect a short circuit of the first transmission line, the relay connection means sends a second transmission line connection request signal individually to each repeater. A monitoring system for disaster prevention.

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