JP7402146B2 - disaster prevention system - Google Patents

Description

The present invention relates to a disaster prevention system.

Conventionally, sprinkler equipment such as a water-discharging head is known as a sprinkler equipment installed in a high ceiling area such as an atrium or an exhibition hall. For example, Patent Document 1 describes a plurality of movable heads installed in a protected area, a central control panel that activates the movable heads in conjunction with a fire signal and instructs fire source search and water spray, and a movable Sprinkler equipment such as a water-discharging head that is equipped with an on-site control panel for manually and remotely controlling the head is described.

Japanese Patent Application Publication No. 2013-230409

In conventional sprinkler equipment such as water-discharging heads, movable heads were individually connected to a central control panel and a field control panel. Therefore, as the number of movable heads increases, there is a problem in that the number of wires connected to the central operation panel and the local operation panel increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the number of wires connected from the terminal equipment to the control panel.

In order to solve the above problems, a disaster prevention system according to the present invention is provided in which a plurality of terminal devices and a control panel for controlling the plurality of terminal devices are communicably connected via a first loop-shaped wiring. ing.

In a preferred embodiment, each of the plurality of terminal devices is a nozzle unit including a fire sensing section and a water spraying section, and the control panel is one of a central control panel and a local control panel.

In a further preferred embodiment, the plurality of terminal devices are communicably connected to the other one of the central control panel and the local control panel via a second loop-shaped wiring.

In a further preferred embodiment, the control panel communicates with the plurality of terminal devices by a polling method, and switches the transmission mode for each polling, and in the transmission mode, the control panel communicates with the plurality of terminal devices in a polling manner. a first transmission mode in which the plurality of terminal devices transmit signals in a second direction opposite to the first direction while transmitting signals in one direction; and a first transmission mode in which the control panel transmits signals in the second direction. and a second transmission mode in which the plurality of terminal devices transmit signals in the first direction.

According to the present invention, the number of wires connected from the terminal device to the control panel can be reduced.

Block diagram showing the configuration of fire extinguishing system 1 Diagram showing the operation of nozzle unit 4 when a fire occurs Diagram showing the first transmission mode Diagram showing the second transmission mode Sequence diagram showing automatic extinguishing mode Sequence diagram showing manual extinguishing mode Another sequence diagram showing manual extinguishing mode Sequence diagram showing water discharge stop/recovery operations Another sequence diagram showing water discharge stop/recovery operation

1. Embodiment 1-1. Configuration A fire extinguishing system 1 according to an embodiment of the present invention will be described with reference to the drawings.
The fire extinguishing system 1 according to this embodiment is a sprinkler equipment such as a water discharge type head installed in a high ceiling part of a building B. FIG. 1 is a block diagram showing the configuration of this fire extinguishing system 1. As shown in FIG. The fire extinguishing system 1 shown in the figure includes an automatic fire alarm facility 2, a central operation panel 3, a plurality of nozzle units 4, a local control panel 5, and a local operation unit 6. Each component will be explained below.

The automatic fire alarm equipment 2 includes a plurality of detectors installed in the high ceiling of building B and an R-shaped fire receiver installed in the disaster prevention center of building B (both not shown). Among these, the detector is, for example, a smoke detector or a flame detector, and transmits an analog value indicating the measured physical quantity to the fire receiver. The fire receiver transmits a sensor alarm signal to the central operation panel 3 when the physical quantity measured by the sensor exceeds a predetermined threshold and its duration exceeds a predetermined time. This sensor alarm signal includes the address of the sensor that triggered the alarm.

The central operation panel 3 is a control panel installed in the disaster prevention center of the building B and connected to the fire receiver via the signal line L1. This central operation panel 3 controls the nozzle unit 4 in response to a sensor alarm signal transmitted from a fire receiver or in response to an operation by center personnel. In addition, information on each nozzle unit 4 is managed to support operations by center personnel. The information on the nozzle unit 4 referred to here refers to state information and operating authority information on the nozzle unit 4.

The nozzle unit 4 is a terminal device installed in a high ceiling part of the building B, and specifically is a movable head. As shown in FIG. 1, this nozzle unit 4 is communicably connected to the central operation panel 3 via a loop-shaped wiring L2. Further, this nozzle unit 4 is communicably connected to the local control panel 5 via a loop-shaped wiring L3. That is, this nozzle unit 4 is not individually connected to the central operation panel 3 and the local control panel 5. Therefore, compared to the case where they are connected individually, the number of wires connected to the central operation panel 3 and the local control panel 5 is reduced.

This nozzle unit 4 includes a water spraying section 41, a sensing section 42, a control section 43, and a signal relay section 44 (see FIG. 2 for the water spraying section 41 and the sensing section 42 among them. The control section 43 and the signal relay section 44 is not shown).

The water spraying section 41 is a combination nozzle that has three types of heads: long throw, medium throw, and short throw in an integrated structure.

The sensing unit 42 includes an infrared linear sensor 421 and a flame detector 422. Among these, the infrared linear sensor 421 searches for a hot spot within the warning area and detects its direction. On the other hand, the flame detector 422 is a three-wavelength infrared flame detector, and detects a fire source in the direction detected by the infrared linear sensor 421.

The control unit 43 receives signals from the central operation panel 3 and the local control panel 5, and controls the water discharging unit 41 and the sensing unit 42 according to the received signals. In addition, the status information and operating authority information of the nozzle unit 4 are managed according to the received signal.

The signal relay section 44 relays signals exchanged between other nozzle units 4 and the central operation panel 3 or the local control panel 5.

FIG. 2 is a diagram showing the operation of this nozzle unit 4 when a fire occurs.
The nozzle unit 4 is normally stored embedded in a wall surface (FIG. 2(a)). In this state, when an exploration start signal is input from the central operation panel 3, the nozzle unit 4 is activated, and the water discharging section 41 and the sensing section 42 start turning as one (FIG. 2(b)). After the start of the turn, the infrared linear sensor 421 searches for a hot spot within the warning area and detects its direction (FIG. 2(c)). When the direction of the hot spot is detected, the front of the flame detector 422 is directed to the detected direction, and the flame detector 422 detects the fire source F in that direction (FIG. 2(d)). When the fire source F is detected, the control unit 43 transmits a fire source position signal indicating the turning angle to the central operation panel 3. After transmitting the fire position signal, the nozzle opening of the water spraying section 41 is directed toward the detected fire source F, and in this state, the nozzle unit 4 enters a standby state (FIG. 2(e)). Thereafter, when a water spray start signal is transmitted from the central operation panel 3 to the nozzle unit 4, water is sprayed from the water spray section 41 to the fire source F.

Next, the local control panel 5 will be explained.
The on-site control panel 5 is a control panel installed within the protected area where the nozzle unit 4 is installed. This local control panel 5 controls the nozzle unit 4 in accordance with operations input by center personnel via a local operation unit 6. In addition, information on each nozzle unit 4 is managed to support operations by center personnel. The information on the nozzle unit 4 referred to here refers to state information and operating authority information on the nozzle unit 4.

The local operation unit 6 is a portable information processing device used to operate the local control panel 5. The on-site operation unit 6 includes a display and a touch panel (both not shown) in order to enable operation of the nozzle unit 4 via the on-site control panel 5. The local operation unit 6 also includes terminals for connecting to the local control panel 5 and the central operation panel 3 via cables. This local operation unit 6 is normally connected to the central operation panel 3, and when used, it is removed from the central operation panel 3, brought to the site, and connected to the local control panel 5.

1-2. Operation The operation of the fire extinguishing system 1 will be explained. Specifically, communication operations, fire extinguishing operations, and water discharge stop/recovery operations will be explained.

1-2-1. Communication Operation The central operation panel 3 and the local control panel 5 communicate with each nozzle unit 4 using a polling method. The polling method referred to herein is a communication method in which a master device periodically inquires of a plurality of slave devices as to whether or not there is a data transmission request. When communicating using this polling method, the central operation panel 3 and the local control panel 5 alternately switch between the first transmission mode and the second transmission mode for each polling. FIG. 3 is a diagram showing the first transmission mode, and FIG. 4 is a diagram showing the second transmission mode. In both figures, the control panel 7 indicates the central operation panel 3 and the local control panel 5.

In the first transmission mode shown in FIG. 3, the control panel 7 transmits signals in a clockwise route (see arrow A1). In contrast, each nozzle unit 4 sends back a signal in a counterclockwise direction (see arrow A2). On the other hand, in the second transmission mode shown in FIG. 4, the control panel 7 transmits signals along a counterclockwise route (see arrow A3). In contrast, each nozzle unit 4 sends back signals in a clockwise route (see arrow A4). In this way, by changing the signal transmission route for each polling, communication between the control panel 7 and each nozzle unit 4 is possible even if a communication failure occurs in part of the network. For example, if the wiring between the control panel 7 and the nozzle unit 4a is disconnected, the control panel 7 will not be able to communicate with each nozzle unit 4 in the first transmission mode, but will not be able to communicate with each nozzle unit 4 in the second transmission mode. Can communicate.

When an event such as an exploration start command or a water spray command occurs, the control panel 7 stores the event in an event list. If an event exists in the event list, polling for the event is performed by interrupting the normal polling cycle once every two times. On the other hand, if there is no event in the event list, polling is performed for each nozzle unit 4 to check the status. In this polling, the status of each nozzle unit 4 and the location of the operating authority are confirmed.

1-2-2. Extinguishing operation Next, the extinguishing operation will be explained. Specifically, automatic fire extinguishing mode and manual fire extinguishing mode will be explained. Here, the automatic fire extinguishing mode is a fire extinguishing mode that automatically performs a series of operations from detecting a fire to discharging water. On the other hand, manual fire extinguishing mode automatically performs everything from detecting a fire to selecting the most suitable nozzle unit 4 for water spraying, and for water spraying, fire extinguishing is started according to the operation of the central operation panel 3 or the local operation unit 6. mode. These two fire extinguishing modes can be switched by operating the central operation panel 3.

1-2-2-1. Automatic Extinguishing Mode FIG. 5 is a sequence diagram showing the automatic extinguishing mode.
When the central operation panel 3 receives a sensor alarm signal from the fire receiver (step Sa1), it specifies the nozzle unit 4 installed within the warning area of the alarming sensor (step Sa2). Then, a search start signal is transmitted to the identified nozzle unit 4 (step Sa3). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If it cannot be confirmed even after retrying, the process continues from the next polling cycle onwards.

Upon receiving the search start signal, the nozzle unit 4 starts searching for the fire source (step Sa4). In addition, it updates its own status information from "storage" to "exploration". When a fire source is detected as a result of the fire source search (step Sa5), a fire source position signal indicating the turning angle at the time of detecting the fire source is transmitted to the central operation panel 3 (step Sa6). In addition, the status information of own aircraft is updated from "exploration" to "confirmation".

When the central control panel 3 receives the fire source position signals from all the nozzle units 4 of the fire compartment, or after a predetermined period of time has passed after receiving the first report of the fire source position signal, the central control panel 3 receives the received fire source position signal. The nozzle unit 4 most suitable for water spraying is selected based on the signal (step Sa7). For the method of selecting the nozzle unit 4 at that time, see, for example, Japanese Patent Laid-Open No. 2000-093540. When the central operation panel 3 selects the nozzle unit 4 most suitable for water spraying, it starts a fire pump (not shown) (step Sa8). In addition, a water discharge start signal is transmitted to the selected nozzle unit 4 (step Sa9). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If it cannot be confirmed even after retrying, the process continues from the next polling cycle onwards.

When the nozzle unit 4 receives the water spray start signal, it transfers the signal to the local control panel 5 (step Sa10). When the local control panel 5 receives this water discharge start signal, it opens the starting valve (not shown) corresponding to the nozzle unit 4 (step Sa11). As a result, water is sprayed from the nozzle unit 4 toward the fire source.

After the starting valve is released, when the local control panel 5 receives an on signal from a pressure switch (not shown) installed on the secondary side of the starting valve (step Sa12), it sends a water discharging signal indicating that water discharging has started. is transmitted to the nozzle unit 4 (step Sa13). When the nozzle unit 4 receives this water spray, it updates its own state information from "confirmed" to "water spray" (step Sa14).
The above is the explanation about the automatic extinguishing mode.

1-2-2-2. Manual Extinguishing Mode FIG. 6 is a sequence diagram showing the manual extinguishing mode. In the manual fire extinguishing mode shown in the figure, it is assumed that water spraying is started in accordance with the operation of the central operation panel 3.

After selecting the nozzle unit 4 most suitable for water discharging as described above (step Sa7), the central operation panel 3 transmits an operation request signal to the nozzle unit 4 when the center personnel performs an operation to obtain operation authority (step Sb1). Step Sb2). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. When the nozzle unit 4 receives the operation request signal, it updates its own operation authority information to "central operation panel" (step Sb3). This update of the operating authority information is also reflected in the operating authority information stored in the central operation panel 3 through status confirmation. As a result, the central operation panel 3 enables water discharge preparation operations.

Thereafter, when the center personnel performs a water spray preparation operation (step Sb4), the central operation panel 3 transmits a water spray preparation signal to the nozzle unit 4 (step Sb5). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. Upon receiving the water discharge preparation signal, the nozzle unit 4 updates its own state information from "confirmed" to "prepared" (step Sb6). This update of the status information is also reflected in the status information stored in the central operation panel 3 through status confirmation. As a result, the central operation panel 3 allows turning operations and water spraying operations.

Thereafter, when a turning operation is performed by the center personnel (step Sb7), the central operation panel 3 transmits a turning signal to the nozzle unit 4 (step Sb8). When the nozzle unit 4 receives this turning signal, it turns the water discharge part 41 in the direction indicated by the signal (step Sb9).

Thereafter, when the center personnel performs a water spraying operation (step Sb10), the central operation panel 3 starts the fire pump (step Sb11). In addition, a water spray start signal is transmitted to the nozzle unit 4 (step Sb12). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated.

Upon receiving the water spray start signal, the nozzle unit 4 transfers the signal to the local control panel 5 (step Sb13). When the local control panel 5 receives this water discharge start signal, it opens the starting valve corresponding to the nozzle unit 4 (step Sb14). As a result, water is sprayed from the nozzle unit 4 toward the fire source.

After the start valve is released, the local control panel 5 receives an on signal from the pressure switch installed on the secondary side of the start valve (step Sb15), and sends a water discharge signal to the nozzle unit 4 indicating that water discharge has started. (Step Sb16). When the nozzle unit 4 receives this water spray signal, it updates its own state information from "confirmed" to "water spray" (step Sb17).
The above is an explanation of the manual fire extinguishing mode.

Next, FIG. 7 is another sequence diagram showing the manual extinguishing mode. In the manual fire extinguishing mode shown in the figure, it is assumed that water spraying is started in response to the operation of the local operation unit 6 connected to the local control panel 5.

After the nozzle unit 4 most suitable for water spraying is selected on the central operation panel 3 (step Sa7), when the center personnel performs an operation to obtain operation authority for the local operation unit 6 (step Sc1), the local control panel 5 An operation request signal is transmitted to the nozzle unit 4 (step Sc2). At that time, if the local control panel 5 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. When the nozzle unit 4 receives the operation request signal, it updates its own operation authority information to "local control panel" (step Sc3). This update of the operating authority information is also reflected in the operating authority information stored in the local control panel 5 through status confirmation. As a result, the on-site operation unit 6 can perform water discharge preparation operations.

Thereafter, when the center personnel performs a water spray preparation operation on the local operation unit 6 (step Sc4), the local control panel 5 transmits a water spray preparation signal to the nozzle unit 4 (step Sc5). At that time, if the local control panel 5 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. Upon receiving the water discharge preparation signal, the nozzle unit 4 updates its own state information from "confirmed" to "prepared" (step Sc6). This update of the status information is also reflected in the status information stored in the local control panel 5 through status confirmation. As a result, the on-site operation unit 6 becomes capable of turning operations and water spraying operations.

Thereafter, when the center personnel performs a turning operation on the local operation unit 6 (step Sc7), the local control panel 5 transmits a turning signal to the nozzle unit 4 (step Sc8). When the nozzle unit 4 receives this turning signal, it turns the water discharge part 41 in the direction indicated by the signal (step Sc9).

Thereafter, when the center personnel performs a water spraying operation on the local operation unit 6 (step Sc10), the local control panel 5 transmits a water spraying request signal to the nozzle unit 4 (step Sc11). At that time, if the local control panel 5 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated.

When the nozzle unit 4 receives the water spray request signal, it transfers the signal to the central operation panel 3 (step Sc12). When the central operation panel 3 receives this water discharge request signal, it starts the fire pump (step Sc13). In addition, a water spray start signal is transmitted to the nozzle unit 4 (step Sc14). When the nozzle unit 4 receives this water discharge start signal, it transfers the signal to the local control panel 5 (step Sc15). When the local control panel 5 receives this water discharge start signal, it opens the starting valve corresponding to the nozzle unit 4 (step Sc16). As a result, water is sprayed from the nozzle unit 4 toward the fire source.

After the start valve is released, the local control panel 5 receives an on signal from the pressure switch installed on the secondary side of the start valve (step Sc17), and sends a water discharge signal to the nozzle unit 4 indicating that water discharge has started. (Step Sc18). When the nozzle unit 4 receives this water spray signal, it updates its own state information from "confirmed" to "water spray" (step Sc19).
The above is an explanation of the manual fire extinguishing mode.

1-2-3. Water discharge stop/recovery operation Next, water discharge stop/recovery operation will be explained. FIG. 8 is a sequence diagram showing the water discharge stop/recovery operation. In the operation shown in the figure, it is assumed that water discharge is stopped and restored in accordance with the operation of the central operation panel 3.

When the center personnel performs a water spray stop operation (step Sd1), the central operation panel 3 transmits a water spray stop signal to the nozzle unit 4 (step Sd2). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. When the nozzle unit 4 receives the water discharge stop signal, it transfers the signal to the local control panel 5 (step Sd3). When the local control panel 5 receives this water discharge stop signal, it closes the start valve corresponding to the nozzle unit 4 (step Sd4). As a result, water discharge from the nozzle unit 4 is stopped.

After the startup valve is closed, when the local control panel 5 receives an off signal from the pressure switch installed on the secondary side of the startup valve (step Sd5), it sends a stop signal to the nozzle unit 4 indicating that water discharge has stopped. Transmit (step Sd6). Upon receiving this stop signal, the nozzle unit 4 updates its own state information from "water spray" to "determined" (step Sd7).

Thereafter, when the center staff performs a full recovery operation (step Sd8), the central operation panel 3 transmits an operation request signal to the nozzle unit 4 (step Sd9). At this time, if the central operation panel 3 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. Upon receiving the operation request signal, the nozzle unit 4 updates its own operation authority information to "open" (step Sd10). "Open" here means that the operating authority does not exist on either the central operation panel 3 or the local control panel 5. In addition, the nozzle unit 4 executes a recovery operation (step Sd11), and upon completion of the recovery operation, updates its own state information from "determined" to "stored".

Thereafter, when a center staff member performs a pump stop operation on a fire pump panel (not shown), the central operation panel 3 turns off the display of fire pump operation (step Sd12).
The above is an explanation of water discharge stop/recovery operations.

Next, FIG. 9 is another sequence diagram showing the water discharge stop/recovery operation. In the operation shown in the figure, it is assumed that water discharge is stopped and restored in accordance with the operation of the local operation unit 6 connected to the local control panel 5.

When the center personnel performs a water spray stop operation on the local operation unit 6 (step Se1), the local control panel 5 transmits a water spray stop request signal to the nozzle unit 4 (step Se2). At that time, if the local control panel 5 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. When the nozzle unit 4 receives the water spray stop request signal, it transfers the signal to the central operation panel 3 (step Se3). When the central operation panel 3 receives this water spray stop request signal, it transmits a water spray stop signal to the nozzle unit 4 (step Se4). When the nozzle unit 4 receives this water spray stop signal, it transfers the signal to the local control panel 5 (step Se5). When the local control panel 5 receives this water discharge stop signal, it closes the start valve corresponding to the nozzle unit 4 (step Se6). As a result, water discharge from the nozzle unit 4 is stopped.

After the startup valve is closed, when the local control panel 5 receives an off signal from the pressure switch installed on the secondary side of the startup valve (step Se7), it sends a stop signal to the nozzle unit 4 indicating that the water discharge has stopped. Transmit (step Se8). When the nozzle unit 4 receives this stop signal, it updates its own state information from "water spray" to "determined" (step Se9).

Thereafter, when the center personnel performs a recovery operation on the local operation unit 6 (step Se10), the local control panel 5 transmits an operation request signal to the nozzle unit 4 (step Se11). At that time, if the local control panel 5 cannot confirm the ACK from the nozzle unit 4, it performs a retry. If the confirmation cannot be made even after retrying, the operation is terminated. Upon receiving the operation request signal, the nozzle unit 4 updates its own operation authority information to "open" (step Se12). In addition, a recovery operation is executed (step Se13), and when the recovery operation is completed, the state information of the own device is updated from "determined" to "stored".

Thereafter, when the center personnel performs a pump stop operation on the fire pump panel, the central operation panel 3 turns off the display of fire pump operation (step Se14).
The above is an explanation of water discharge stop/recovery operations.

In addition, although the central operation panel 3 outputs the water discharge stop signal in the above-mentioned water discharge stop/recovery operation, the nozzle unit 4 may output the water discharge stop signal instead of the central operation panel 3. In that case, the nozzle unit 4 receives a water spray stop request signal sent from the local control panel 5 and transmits a water spray stop signal to the local control panel 5.

2. Modifications The above embodiment may be modified as follows. Note that the following modifications may be combined with each other.

2-1. Modification example 1
As described above, the sensing section 42 of the nozzle unit 4 includes the infrared linear sensor 421 and the flame detector 422. However, this configuration is just an example. Other sensors may be used as long as the search and detection of the fire source is possible.

2-2. Modification example 2
The fire extinguishing system 1 may also include auxiliary sensors. The auxiliary sensor herein refers to a terminal device that includes the sensing section 42, the control section 43, and the signal relay section 44 included in the nozzle unit 4. In other words, it is a nozzle unit 4 that does not include the water discharge section 41. This auxiliary sensor is installed in the high ceiling part of building B.

Similar to the nozzle unit 4, the auxiliary sensor is communicably connected to the central operation panel 3 via a loop-shaped wiring L2. In addition, it is communicably connected to the local control panel 5 via a loop-shaped wiring L3.

This auxiliary sensor operates as follows in the automatic extinguishing mode described above.
First, when the central operation panel 3 receives a sensor alarm signal from the fire receiver, it specifies the nozzle unit 4 and auxiliary sensor installed within the alert area of the alarm that has issued the alarm. Then, an exploration start signal is transmitted to the identified nozzle unit 4 and auxiliary sensor.

When the auxiliary sensor receives this search start signal, it starts searching for the fire source. When a fire source is detected as a result of the fire source search, a fire source position signal indicating the turning angle at the time of detecting the fire source is transmitted to the central operation panel 3.

The central control panel 3 receives the fire source position signals from all the nozzle units 4 and auxiliary sensors in the fire compartment, or when a predetermined period of time has elapsed since receiving the first report of the fire source position signal. The most suitable nozzle unit 4 for water spraying is selected based on the fire source position signal. In this way, the fire source position signal transmitted from the auxiliary sensor is referenced to select the nozzle unit 4 most suitable for water spraying.

2-3. Modification example 3
In the embodiments described above, the fire extinguishing system 1 employs a loop-shaped wiring connection. However, this loop-shaped wiring connection may be employed in other disaster prevention systems. For example, in the automatic fire alarm equipment 2, a plurality of terminal devices and a control panel for controlling the plurality of terminal devices may be communicably connected by loop-shaped wiring. Specifically, a plurality of district sound devices and fire receivers may be communicably connected by loop-shaped wiring.

2-4. Modification example 4
The sensor of the automatic fire alarm equipment 2 is not limited to an analog type, and may be a sensor with a fixed sensitivity. Furthermore, the fire receiver is not limited to the R type, but may be of the P type.

1... Fire extinguishing system, 2... Automatic fire alarm equipment, 3... Central operation panel, 4... Nozzle unit, 5... Local control panel, 6... Local operating unit, 7... Control panel, 41... Water discharge section, 42... Sensing section, 43...Control unit, 44...Signal relay unit, 421...Infrared linear sensor, 422...Flame detector

Claims (3)

A plurality of terminal devices and a central control panel for controlling the plurality of terminal devices are communicably connected via a first loop-shaped wiring,
A disaster prevention system in which the plurality of terminal devices and a local control panel for controlling the plurality of terminal devices are communicably connected via a second loop-shaped wiring. Each of the plurality of terminal devices is a nozzle unit including a fire detector and a water spray unit.
The disaster prevention system according to claim 1, characterized in that : The central control panel or the local control panel communicates with the plurality of terminal devices using a polling method, and switches the transmission mode for each polling,
In the transmission mode, the central control panel or the local control panel transmits a signal in a first direction of the first loop wiring or the second loop wiring, while the plurality of terminal devices transmit the signal in the first direction of the first loop wiring or the second loop wiring. a first transmission mode in which a signal is transmitted in a second direction that is opposite to the first direction; and a first transmission mode in which the central control panel or the local control panel transmits a signal in the second direction; The disaster prevention system according to claim 1 or 2 , characterized in that the disaster prevention system includes a second transmission mode in which the signal is transmitted in the first direction.

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