JP2013054677A - Fire alarm system and fire sensor used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire alarm system allowing an existing fire receiver to notify of malfunction.SOLUTION: A fire alarm system 100, 200, or 300 comprises a sensor circuit 3 connected to a fire receiver 1, and a single or a plurality of fire sensors 2 connected to the sensor circuit 3 and outputting, by a switching operation, a fire signal to the sensor circuit 3. The fire sensor 2 includes: inspection means 12-14 for detecting its own malfunction by a self inspection; and output means 12-14, when there is malfunction on the basis of the results of the inspection means 12-14, outputting an abnormal signal to the sensor circuit 3. Disconnection generating means R, configured to disconnect the sensor circuit 3 when receiving the abnormal signal, is connected to the sensor circuit 3. The fire receiver 1 includes disconnection alarm issuing means 1 configured to issue a disconnection alarm when the sensor circuit 3 is disconnected.

Description

  The present invention relates to a fire detector and a fire alarm facility.

  For example, in a conventional fire alarm system, a fire receiver is installed in the central monitoring room, a line line and a common line are arranged from the fire receiver, and the line line and the common line are connected via a terminating resistor. (For example, refer to Patent Document 1).

JP-A-6-176289 (see, for example, paragraphs [0016] to [0019] and FIG. 1)

For example, in the case of a failure in a fire detector, the technology described in Patent Document 1 cannot be used to control an alarm or display when a fire receiver, for example, a P-type receiver receives that fact. .
In addition, by providing a self-inspection function that outputs to the fire receiver that a failure has occurred in the fire detector, to display whether the fire detector has failed or not, the fire receiver can receive a dedicated fire receiver. There was a problem that it had to be replaced with a machine (for example, R type).

  The present invention has been made to solve the above-described problems, and it is possible to notify a failure occurring in a fire detector even with a fire receiver that is not a dedicated fire receiver, without replacing an existing fire receiver. It aims at providing the fire alarm equipment which makes it possible, and the fire detector used for it.

  A fire alarm system according to the present invention includes a sensor line connected to a fire receiver, one or more fire detectors connected to the sensor line and outputting a fire signal to the sensor line by a switching operation, In the fire alarm facility, the fire detector has an inspection means for detecting its own malfunction by self-inspection, and an output means for outputting an abnormal signal to the sensor line when there is a malfunction based on the result of the inspection means. The sensor line is connected with disconnection generating means for disconnecting the sensor line when an abnormal signal is received, and the fire receiver issues a disconnection alarm that issues a disconnection alarm when the sensor line is disconnected. Means are provided.

  A fire detector according to the present invention is connected to a fire receiver via a sensor line, and in a fire detector that outputs a fire signal to the sensor line by a switching operation, an inspection means for detecting a self-failure by self-inspection. And an output means for outputting an abnormal signal to the sensor line when there is a malfunction, a receiving means for receiving the abnormal signal from the sensor line, and a termination element connected to the sensor line based on the result of the inspection means. And a disconnecting unit that disconnects the terminating element and disconnects the sensor line when the receiving unit receives an abnormal signal when the receiving unit receives the abnormal signal.

  According to the fire alarm facility according to the present invention, the disconnection generating means disconnects the sensor line when receiving the abnormal signal output to the sensor line, and the disconnection alarm notification means disconnects the sensor line. A disconnection alarm is issued when Thereby, even if the fire alarm facility according to the present invention is not a dedicated fire receiver, the existing fire receiver can notify the malfunction of the fire detector without renewal.

  According to the fire detector according to the present invention, when the receiving means receives an abnormal signal, the fire detector is provided with the disconnecting means for disconnecting the terminating element and disconnecting the sensor line. Without any problem, the fire detector can be informed with the existing fire receiver.

It is a schematic block diagram of the fire alarm facility according to Embodiment 1 of the present invention. It is an example of the structure of the control circuit of the fire detector provided with the termination resistance shown in FIG. (A) shows the voltage of the sensor line during normal times and fires, and (b) shows the voltage of the sensor line during normal times and when a failure occurs. It is a schematic block diagram of the fire alarm facility according to Embodiment 2 of the present invention. It is a general | schematic structural example figure of the fire alarm equipment which concerns on Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram of a fire alarm facility 100 according to Embodiment 1 of the present invention. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. FIG. 1 shows an example in which three fire detectors 2A not connected to termination resistors are provided and one fire detector 2B equipped with a termination resistor R as a termination element is provided. Show. Here, the number of fire detectors 2A is not limited thereto.

The fire alarm system 100 can notify a malfunction that has occurred in each of the fire detectors 2, and enables the fire receiver 1 to alert the malfunction.
The fire alarm system 100 includes a fire detector 2 installed in each room of a building (for example, a housing complex such as a hotel or a condominium, an office building, or a commercial facility), and an alarm based on the detection result of the fire detector 2. A P-type fire receiver 1 is connected by a common line 3A and a line 3B which are sensor lines 3. P-type fire receiver is a fire based on the electrical change of the sensor line by closing the electrical contact of the fire sensor connected to the sensor line consisting of the common line 3A and line 3B. Is to judge. Hereinafter, the common line 3A and the line line 3B may be collectively referred to as a sensor line 3.

[Configuration of Fire Alarm Equipment 100]
The fire receiver 1 notifies the occurrence of a fire based on a change in the voltage of the sensor line 3 or the like. The fire receiver 1 is provided with, for example, a speaker for notifying a fire by voice, a lamp for notifying by a display, and the like. The fire receiver 1 informs that the sensor circuit 3 is disconnected by a voice or lamp disconnect alarm when the sensor circuit 3 is disconnected. However, if the fire sensor 2 has a problem, In the same manner as when the sensor line 3 is disconnected, a disconnection alarm can be notified. The fire receiver 1 is connected to one or a plurality of fire detectors 2 via a common line 3A and a line line 3B. The fire receiver 1 is connected to a central management room such as a building disaster prevention center. And the fire and malfunction which the fire receiver 1 detected are alert | reported in a disaster prevention center.

  The fire detector 2 detects heat, smoke, flame and the like generated by the flame, and outputs a fire signal to the fire receiver 1 via the sensor line 3. Note that the fire signal of the fire detector 2 according to the first embodiment will be described assuming that the impedance of the sensor line 3 is reduced by the switching operation of the fire detector 2. In addition, when the fire detector 2 detects its own malfunction such as an output value abnormality, it outputs that fact as an abnormal signal as a malfunction signal. In the following description, it is assumed that the fire detector 2 detects “heat, smoke, flame, etc.” and the fire detector 2 detects “fire”. The fire detector 2 is connected to the fire receiver 1 via the sensor line 3 so as to be connected in parallel by a so-called feed wiring system.

The fire detector 2 includes a fire detector 2B provided with a termination resistor R, which will be described later, and a fire detector 2A provided with no termination resistor R. That is, in the first embodiment, the fire detector 2B is connected to the end of the detector line 3 with respect to the fire receiver 1, and another fire is connected between the fire receiver 1 and the end fire detector 2B. A sensor 2A is connected. That is, the fire detector 2B is a terminator connected to the termination of the sensor line 3 with respect to the fire receiver 1.
The terminal fire detector 2B is controlled to disconnect and disconnect the terminal resistor R and the sensor line 3 based on the abnormal signal output from the other fire sensor 2A and its own abnormal signal. It is.
The termination resistance R is a resistance connected to the termination (terminal) of the sensor line 3 connected by a so-called feed wiring system. As a result, a weak current is passed through the sensor line 3, and the fire receiver 1 monitors the disconnection. The termination resistor R according to the first embodiment is connected to the sensor line 3 through the internal circuit of the fire sensor 2B.

  The sensor line 3 is composed of a common line 3A and a line line 3B, and connects the fire receiver 1 and the fire detector 2. The fire detectors 2 are connected to the common line 3A and the line 3B so as to have a parallel connection relationship by a so-called feed wiring system. The common line 3A and the line line 3B constitute one line as a set. That is, for example, if the common line 3A is shared from the fire receiver 1 and a plurality of line lines 3B are drawn to form a plurality of lines, a fire signal can be received for each line.

[Configuration of fire detector 2B]
FIG. 2 is an example of the configuration of the control circuit 50 of the fire detector 2B provided with the termination resistor R shown in FIG. The configuration of the control circuit 50 of the fire detector 2B will be described with reference to FIG.
The fire detector 2B detects the abnormal signal from the fire detector 2A, the constant voltage circuit 11 for supplying a predetermined constant voltage for operation to the reception circuit 10, the smoke, heat, etc. related to fire. A detection circuit 14; a determination circuit 13 for determining the occurrence of a fire or the occurrence of its own malfunction based on the output of the detection circuit 14 and the output of the reception circuit 10; a switching circuit 12 and a disconnect circuit controlled by the determination circuit 13; 15, an input circuit 16 that detects whether or not the termination resistor R is connected to the sensor line 3, a termination resistor R that is connected to the disconnection circuit 15 and the input circuit 16, and an operation that flashes in the event of a fire or the like And an indicator lamp 17.

  The receiving circuit 10 receives an abnormal signal (first abnormal signal) output from the fire detector 2 </ b> A and outputs the reception result to the determination circuit 13. The receiving circuit 10 is connected to the common line 3 </ b> A, the constant voltage circuit 11, and the determination circuit 13. The receiving circuit 10 is operated by the fire sensor 2B provided with the terminal resistance R like the fire sensor 2B, and does not need to be operated by the fire sensor 2A. Here, the first abnormal signal indicates a signal output from the fire detector 2A to the fire detector 2B.

  The constant voltage circuit 11 converts the power supply voltage supplied from the fire receiver 1 via the sensor line 3 into a predetermined voltage value, for example, 5 (V), and supplies it. As shown in FIG. 2, the constant voltage circuit 11 is connected to the determination circuit 13 and the detection circuit 14 and supplies an operating voltage thereto. The constant voltage circuit 11 is composed of, for example, a constant voltage IC.

  The detection circuit 14 detects heat, smoke, flame, and the like generated by a fire and outputs a detection result. The detection circuit 14 is connected to the determination circuit 13.

The determination circuit 13 determines the output level of the detection circuit 14 to determine whether or not there is a fire, controls the switching circuit 12 based on the determination result, and sends a fire signal to the fire receiver 1. Output. In addition, the discrimination | determination circuit 13 makes the operation indicator lamp 17 light, when it discriminate | determines that it is a fire. Further, the discrimination circuit 13 detects a malfunction of the fire detector 2 provided with the detection circuit 14 by an output value monitoring method, and if there is a malfunction as a result of the detection, recognizes the malfunction of the fire sensor 2 itself as an abnormal signal. To do. Here, the second abnormal signal indicates a signal output from the detection circuit 14 of the fire detector 2B to the determination circuit 13.
In addition, the output value monitoring method is how much the output value when the fire detector 2 does not detect a fire changes with respect to the output value when the fire detector 2 is initially installed. This is a method of detecting and detecting a malfunction of the fire detector 2. The method by which the detection circuit 14 detects the malfunction of the fire detector 2 is not limited to this. For example, as a pseudo output method, there is a method of performing a pseudo input of heat or light by itself. It is assumed that the detection circuit 14 according to the above employs an output value monitoring method. In addition, when determining that the output value is abnormal, the determination circuit 13 blinks the operation indicator lamp 17 as display means for displaying and identifying that there is a problem with the fire detector 2 to the outside.

The determination circuit 13 also outputs the second abnormality signal output from the detection circuit 14 and the first abnormality signal output from the other fire detector 2 and output via the sensor line 3 and the receiving circuit 10. The separation circuit 15 is controlled based on the above.
Specifically, the determination circuit 13 provided in the fire detector 2B determines the level of the second abnormal signal output from the detection circuit 14, or determines the level of the first abnormal signal output from the reception circuit 10. Is performed to determine whether or not the fire detector 2 on the detector line 3 is abnormal, and the disconnection circuit 15 is controlled based on the determination result.

  Further, the determination circuit 13 determines whether the disconnection circuit 15 connects the termination resistor R and the sensor line 3 based on the output of the input circuit 16, that is, the termination resistor R is connected to the fire detector 2. It is discriminate | determined whether it is. The determination circuit 13 is connected to the reception circuit 10, the detection circuit 14, the switching circuit 12, the disconnection circuit 15, the input circuit 16, and the operation indicator lamp 17. Note that the determination circuit 13 may be constituted by, for example, a microprocessor.

  The switching circuit 12 is in a closed state when the determination circuit 13 determines that there is a fire, and outputs a fire signal to the fire receiver 1. That is, if the discrimination circuit 13 discriminates that there is a fire, it outputs an output corresponding to the discrimination result, and the switching circuit 12 receiving the output keeps the sensor line 3 in a low impedance state. The fact that the switching circuit 12 maintains the sensor line 3 in a low impedance state is a fire signal from the fire sensor 2B to the fire receiver 1. Low impedance means that the impedance is lower than the impedance of the sensor line 3 in a state where no fire has occurred. The switching circuit 12 is connected to the discrimination circuit 13 and the sensor line 3. Note that the switching circuit 12 is preferably constituted by, for example, a transistor.

  The disconnect circuit 15 controls the connection between the terminating resistor R and the sensor line 3 based on the output of the determination circuit 13. That is, when the discrimination circuit 13 determines that one of the fire detectors 2 is defective, the determination circuit 13 outputs an output corresponding to the determination result. Disconnect the connection. Thus, when the connection between the sensor line 3 and the terminating resistor R is disconnected by the disconnection circuit 15, the sensor line 3 is disconnected and is detected by a disconnection detection circuit not described in detail of the fire receiver 1. The fire receiver 1 notifies a disconnection alarm. This disconnecting circuit 15 is connected to the common line 3A and has a terminal resistor R connection.

  The terminating resistor R is connected to the common line 3A via the disconnect circuit 15 and is connected to the line line 3B via the input circuit 16. The termination resistor R is not particularly limited as a termination element, and for example, a resistor having a lead wire may be adopted.

  The input circuit 16 causes the determination circuit 13 to determine whether or not the termination resistor R is connected to the fire detector 2 itself. Specifically, the input circuit 16 outputs to the discrimination circuit 13 so as to detect whether or not the termination resistor R is connected to the sensor line 3 via the normally closed disconnection circuit 15, and the output The determination circuit 13 determines whether or not the termination resistor R is attached. The input circuit 16 is connected to the determination circuit 13 and the line 3 </ b> B, and has a terminal resistor R connection.

  The operation indicator lamp 17 is controlled to be lit or blinked in the event of a fire or malfunction based on the output of the discrimination circuit 13. The operation indicator lamp 17 is connected to the determination circuit 13 and the line 3B. The operation indicator lamp 17 may be a light emitting element such as an LED.

[Configuration of Fire Detector 2A]
The fire detector 2A has the same configuration as the fire detector 2B except that the termination resistor R is not provided. That is, the fire detector 2A includes a receiving circuit 10, a constant voltage circuit 11, a detection circuit 14, a determination circuit 13, a switching circuit 12, a disconnect circuit 15, an input circuit 16, and an operation indicator lamp 17. have. Note that the fire detector 2A may not include the receiving circuit 10, the disconnect circuit 15, and the input circuit 16 together with the terminating resistor R.

For the determination circuit 13 provided in the fire detector 2A, the level of the output of the detection circuit 14 is determined to determine whether or not the fire detector 2A is defective. Then, the discrimination circuit 13 provided in the fire detector 2A controls the switching circuit 12 based on the discrimination result, and causes the switching circuit 12 to output an abnormal signal.
Further, regarding the switching circuit 12 provided in the fire detector 2A, when the determination circuit 13 determines the malfunction of the fire detector 2, an abnormal signal is output to the terminal fire detector 2B via the sensor line 3. That is, when the determination circuit 13 provided in the fire detector 2A determines that the fire detector 2A is defective, the determination circuit 13 outputs an output corresponding to the determination result, and the switching circuit 12 receiving the output passes through the detector line 3. Thus, an abnormal signal is output to the fire detector 2B to which the terminating resistor R is connected.

The detection circuit 14 of the fire detector 2A, the discrimination circuit 13 and the switching circuit 12 detect an abnormal signal based on the result of the inspection means for detecting the own malfunction by the self-inspection, and when there is a malfunction. An output means for outputting to the device line 3 is constructed.
The disconnection circuit 15 of the fire detector 2B constitutes a disconnecting means. The disconnecting means disconnects the terminating resistor R and disconnects the sensor line 3 when the receiving circuit 10 receives an abnormal signal. The disconnecting means and the termination resistor R of the fire detector 2B constitute a disconnection generating means for disconnecting the sensor line 3 when an abnormal signal is received from the output means. The disconnection generating means in the first embodiment is connected to the termination portion of the sensor line 3 and is connected to the receiving means for receiving the abnormal signal transmitted by the output means, and connected to the terminating element, and the receiving means has received the abnormal signal. And disconnecting means for disconnecting the sensor line 3 from time to time by disconnecting the terminating element. The disconnection generation means may be configured to distinguish the termination resistor R intermittently from the disconnection in the case of a malfunction of the fire detector 2.

  The receiving circuit 10 of the fire detector 2B constitutes receiving means for receiving an abnormal signal from the detector line 3. Further, the operation indicator lamps 17 of the fire detectors 2A and 2B constitute display means, and the input circuit 16 of the fire detectors 2A and 2B constitutes input means for detecting that the terminating resistor R is connected. . When the input unit detects the connection of the termination resistor R, the disconnecting unit disconnects the termination resistor R based on the reception of the abnormal signal by the receiving circuit 10. Furthermore, the fire receiver 1 has a disconnection alarm issuing means such as a lamp or a speaker for informing a disconnection alarm by disconnecting the sensor line 3 when there is a malfunction in the fire detector 2. Yes.

[Description of operation]
With reference to FIG.1 and FIG.2, the operation example of the fire alarm equipment 100 at the time of a fire is demonstrated.

(1) Each fire detector 2 operates the input circuit 16 at the time of activation, and causes the determination circuit 13 to determine the presence or absence of the termination resistor R.

(2) The discrimination circuit 13 operates as the fire detector 2A without the termination resistor R when it is determined that there is no termination resistor R, and operates as the fire detector 2B when it is determined that there is the termination resistor R. . In addition, each fire detector 2 performs fire discrimination at predetermined intervals during operation. Note that during this operation, each fire detector 2 also determines whether or not it has a defect by the output value monitoring method.

(3) In the determination circuit 13 provided in the fire detector 2A, if it is determined that it is defective from the output value of the detection circuit 14, the switching circuit 12 is controlled to change the impedance of the sensor line 3. That is, an abnormality signal is output from the determination circuit 13 provided in the fire detector 2A. Here, the change in the impedance may be performed, for example, by changing the voltage of the sensor line 3 in a pulse manner. An example of this pulse-like change will be described later with reference to FIG.
On the other hand, in the determination circuit 13 provided in the fire detector 2B, even if it is determined that it is defective from the output value of the detection circuit 14, the switching circuit 12 is controlled to change the impedance of the detector line 3. No action is taken. That is, the determination circuit 16 provided in the fire detector 2B directly controls the disconnection circuit 15 as will be described later.
The discrimination circuits 13 of the fire detectors 2A and 2B, which have been determined to be defective, cause the operation indicator lamp 17 to blink to notify the user that there is a problem in appearance.

(4) The receiving circuit 10 of the fire detector 2B monitors the voltage of the sensor line 3. That is, the receiving circuit 10 of the fire detector 2B receives the abnormal signal from the fire detector 2A via the sensor line 3.

(5) When the reception circuit 10 of the fire detector 2B receives the abnormal signal from the fire detector 2A, the reception result is output to the determination circuit 13. Upon receiving this output, the determination circuit 13 controls the disconnection circuit 15 so as to disconnect the connection between the sensor line 3 and the termination resistor R.
In addition, when the determination circuit 13 of the fire detector 2B detects a failure of the fire detector 2B itself based on the output of the detection circuit 14, an abnormal signal is set by the determination circuit 13 of the fire detector 2B. The determination circuit 13 that has received this setting controls the disconnection circuit 15 so as to disconnect the connection between the sensor line 3 and the termination resistor R.

(6) When the fire receiver 1 detects that the termination resistor R is disconnected from the sensor line 3, that is, the sensor line 3 is disconnected by a disconnection detection circuit not described in detail, the fire receiver 1 The fact that the board is disconnected is displayed, and the fire receiver 1 outputs the fact by voice or display.

(7) It should be noted that the fire alarm system 100 can detect a fire even during the operation of detecting a problem in (3) to (6). That is, when the fire detector 2 detects a fire, the fire detector 2 outputs a fire signal to the fire receiver 1 via the sensor line 3. And the fire receiver 1 can alert | report a fire by the audio | voice from a speaker or blink of a lamp | ramp based on the output fire signal.

[Fire signal and abnormal signal]
FIG. 3A shows the voltage of the sensor line 3 during normal times and fires, and FIG. 3B shows the voltage of the sensor line 3 during normal times and when a failure occurs. An example of the fire signal and the abnormality signal will be described based on FIG.
The fire signal output from the fire detectors 2A and 2B is set such that when the voltage value of the normal sensor line 3 without fire is set to about 24 (V), for example, this voltage value is set to about 8 (V), for example. Change the configuration.
The abnormal signal output from the fire detector 2A is configured by changing the voltage in a pulsed manner a predetermined number of times at a short interval from about 24 (V) of the sensor line 3 when there is no fire (normal time). It is advisable to use a signal. In FIG. 3, the predetermined number of times is shown as an example. As a result, even if the discrimination circuit 13 of the fire detector 2B cannot capture the first voltage change, the discrimination circuit 13 can reliably check whether this voltage change is an abnormal signal by the second voltage change. it can. Therefore, the predetermined number of times may be set to 2 or more.

[Effects of the fire alarm system 100]
In the fire alarm system 100 according to the first embodiment, when the determination circuit 13 of the fire detector 2B receives an abnormal signal from the fire detector 2A via the sensor line 3, or a malfunction of the fire detector 2B itself. Is detected, the disconnection circuit 15 is controlled to disconnect the termination resistor R from the sensor line 3. That is, the determination circuit 13 of the fire detector 2B disconnects the connection between the sensor line 3 and the termination resistor R, and disconnects the sensor line 3. Thereby, even if it is a P-type fire receiver 1, the disconnection of the sensor circuit | line 3 can be detected as an abnormal signal, and the malfunction of the fire sensor 2 can be known. That is, the fire alarm system 100 according to the first embodiment notifies the malfunction of the fire detector 2 even in the fire receiver 1 that is not a dedicated fire receiver that can receive and control the result of the self-inspection of the fire detector 2. can do.

  The fire alarm system 100 according to the first embodiment is effective when applied to, for example, a P-type fire alarm system already provided in a building. In other words, among the fire detectors of the P-type fire alarm equipment already installed in the building, the fire detector at the end is the fire detector 2B, and the other fire detector is the fire detector 2A. That is, the facility 100 can be obtained. This can be implemented at a lower cost than when the fire receiver of the P-type fire alarm system already provided in the building is a dedicated fire receiver (for example, R type).

  Further, the fire detector 2A can be manufactured at low cost because the receiving circuit 10, the disconnecting circuit 15, and the input circuit 16 are not required together with the terminating resistor R, as compared with the fire detector 2B. On the other hand, the configuration of the fire detector 2A may be the same as that of the fire detector 2B. In this case, it is only necessary to install the same fire detector 2B in the fire alarm facility 100, so that efficient construction is possible.

Embodiment 2. FIG.
In the first embodiment described above, the case where the fire detector 2B provided with the termination resistor R has a function as a fire detector has been described. FIG. 4 is a schematic configuration example diagram of a fire alarm facility according to Embodiment 2 of the present invention. In the second embodiment, the fire alarm system 200 is configured by connecting a termination device 25 that is a termination device that does not have a function as a fire detector to the termination of the sensor line 3. The terminator 25 is a terminator connected to the sensor line 3 at the end of the fire receiver 1. In the second embodiment, the description will mainly focus on differences from the first embodiment.

The fire alarm system 200 is configured by connecting a terminating device 25 that does not have a function as a fire detector and a fire detector 20 to the fire receiver 1 via a sensor line 3.
The terminating device 25 only needs to be provided with the receiving circuit 10, the disconnecting circuit 15, and the determining circuit 13. Further, the fire detector 20 may be provided with a configuration excluding the termination resistor R, the receiving circuit 10, the disconnecting circuit 15, and the input circuit 16 from the configuration illustrated in FIG.
Thus, the fire alarm system 200 according to the second embodiment suppresses the configuration of the fire detector 20 and the control circuit of the termination device 25 from becoming complicated by using the termination device 25 dedicated to the termination device. can do.
The operation of the second embodiment can be performed in the same manner as in the first embodiment.

Embodiment 3 FIG.
FIG. 5 is a schematic configuration diagram of a fire alarm facility according to Embodiment 3 of the present invention. The fire alarm system 300 according to the third embodiment is configured by connecting the fire detector 30 with an abnormality signal wiring 31 separate from the sensor line 3. In the third embodiment, the description will mainly focus on differences from the first and second embodiments.

The fire alarm facility 300 according to the third embodiment is configured to output a fire signal to the sensor line 3 and output an abnormal signal to the abnormal signal wiring 31. The configuration of the control circuit of the fire detector 30A according to the third embodiment is additionally provided with a transmission circuit that outputs an abnormal signal to the abnormal signal wiring 31 in addition to the configuration illustrated in FIG. In addition, the receiving circuit 10 of the fire detector 30B according to the third embodiment may be configured to be connected to the abnormal signal wiring 31.
The operation of the third embodiment can be performed in the same manner as in the first embodiment.
As described above, the fire alarm system 300 according to the third embodiment is configured to output a fire signal to the sensor line 3 and output an abnormal signal to the abnormal signal wiring 31. Can be suppressed, and the reliability of the operation of the fire alarm system 300 can be improved.
The fire detector 30 according to the third embodiment may be configured like the fire detector 20 and the termination device 25 according to the second embodiment.

  Needless to say, the descriptions in Embodiments 1 to 3 may be combined as appropriate.

  1 Fire Receiver, 2 Fire Detector, 2A Fire Detector, 2B Fire Detector, 3 Sensor Line, 3A Common Line, 3B Line Line, 10 Receiver Circuit, 11 Constant Voltage Circuit, 12 Switching Circuit, 13 Discrimination Circuit, 14 detection circuit, 15 disconnection circuit, 16 input circuit, 17 operation indicator lamp, 20 fire detector, 25 termination device, 30 fire detector, 30A fire detector, 30B fire detector, 31 wiring for abnormal signal, 50 control Circuit, 100, 200, 300 Fire alarm equipment, R Terminal resistance.

Claims (6)

In a fire alarm system comprising: a sensor line connected to a fire receiver; and one or a plurality of fire detectors connected to the sensor line and outputting a fire signal to the sensor line by a switching operation;
The fire detector includes an inspection unit that detects a self-failure by self-inspection, and an output unit that outputs an abnormal signal to the sensor line when there is a failure based on a result of the inspection unit,
The sensor line is connected to disconnection generating means for disconnecting the sensor line when the abnormal signal is received,
The fire alarm equipment comprising a disconnection alarm notification means for issuing a disconnection alarm when the sensor line is disconnected. The disconnection generating means includes a termination element connected to a termination portion of the sensor line;
Receiving means for receiving the abnormal signal transmitted by the output means;
The fire according to claim 1, further comprising: a disconnecting unit that is connected to the termination element and disconnects the termination element by disconnecting the termination element when the receiving unit receives the abnormal signal. Notification equipment.   The fire alarm system according to claim 1 or 2, wherein the fire detector includes display means for displaying and identifying that there is a defect on the outside based on a result of the inspection means.   The fire alarm system according to any one of claims 1 to 3, wherein the disconnection generation means intermittently disconnects the termination element. In a fire detector that is connected to a fire receiver via a sensor line and outputs a fire signal to the sensor line by a switching operation,
Inspection means for detecting a self-failure by self-inspection, and output means for outputting an abnormal signal to the sensor line when there is a trouble based on the result of the inspection means;
Receiving means for receiving the abnormal signal from the sensor line;
A disconnecting means for disconnecting the terminating element by disconnecting the terminating element when the receiving means receives the abnormal signal when a terminating element connected to the sensor line is attached; A fire detector characterized by that.   The fire detector includes input means for detecting that the termination element is connected, and when the input means detects connection of the termination element, based on reception of the abnormal signal by the reception means. The fire detector according to claim 5, wherein the separating means separates the termination element.

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