JP6175235B2 - Fire alarm equipment and fire detector and termination device used therefor - Google Patents

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 provided from the fire receiver as a detector line, and the line line and the common line are terminated resistors. Some are connected via a cable (for example, see Patent Document 1).
Such a fire receiver is called a P-type fire receiver, and judges a fire or the like by comparing the voltage between the line line and the common line with each threshold value such as a fire threshold value and a disconnection threshold value.

JP-A-6-176289

In the fire alarm system described in Patent Document 1, abnormalities in the wiring of the sensor line can be determined, but when a fault (abnormality) occurs in the fire detector, the fire receiver displays a voice or indication of the fault in the fire detector. Etc. could not be notified.
In order to notify the fire receiver that a failure has occurred in the fire detector, use a fire detector with a self-inspection function that outputs a signal such as a pulse to the fire receiver when a failure has occurred in the fire detector. At the same time, there is a problem in that it must be replaced with a dedicated fire receiver (for example, R type) that communicates with the fire detector.

  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. And a disconnection generating means for intermittently disconnecting the sensor line when an abnormal signal is output is connected to the sensor line, and the fire receiver issues a disconnection alarm when the sensor line is disconnected. It is equipped with alarm issuing means.

  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 means for intermittently disconnecting the sensor line by intermittently disconnecting the termination element from the sensor line when the receiving means receives an abnormal signal.

  According to the fire alarm facility according to the present invention, the disconnection generating means intermittently disconnects the sensor line when receiving the abnormal signal output to the sensor line, and the disconnection alarm notification means is the sensor. Issue a disconnection alarm when the line is disconnected. 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. In particular, it is possible to determine in the fire receiver whether the wiring of the sensor line is broken or a failure of the fire sensor.

  According to the fire detector of the present invention, when the receiving means receives the abnormal signal, the fire detector is provided with the disconnecting means for intermittently disconnecting the terminating element and intermittently disconnecting the sensor line. Even if it is not, the failure of the fire detector can be notified by the existing fire receiver without renewal. In particular, it is possible to determine in the fire receiver whether the wiring of the sensor line is broken or a failure of the fire sensor.

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 fire signal at the time of a fire, (b) shows the abnormal signal at the time of malfunction of a fire detector. 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 disconnection alarm when the sensor circuit 3 is disconnected. This can be notified by intermittently performing a disconnection alarm similar to that when the sensor line 3 is disconnected. 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 sensor 2B disconnects the connection between the terminal resistor R and the sensor line 3 based on the abnormality signal output from the other fire sensor 2A and its own abnormality, and connects after a predetermined time has elapsed. In addition, the control for separating again after a predetermined time elapses is repeated.
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. When a weak current does not flow through the sensor line 3, the fire receiver 1 determines that the sensor line 3 is disconnected. 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 receives the abnormal signal from the fire detector 2A, the constant voltage circuit 11 that supplies a predetermined constant voltage for operation to the reception circuit 10, the detection circuit 10, and the like, detects smoke and heat related to fire, etc. A detection circuit 14 that performs detection, a determination circuit 13 that determines the occurrence of a fire and the occurrence of its own malfunction based on the output of the detection circuit 14 and the output of the reception circuit 10, and the switching circuit 12 and the disconnection controlled by the determination circuit 13 The circuit 15, the input circuit 16 for detecting whether or not the termination resistor R is connected to the sensor line 3, the termination resistor R connected to the disconnecting circuit 15 and the input circuit 16, and flashing in the event of a fire or the like And an operation indicator lamp 17.

  The receiving circuit 10 receives the abnormal signal output from the fire detector 2A and outputs the reception result to the determination circuit 13. The receiving circuit 10 is connected to the common line 3A, the line line 3B, and the determination circuit 13.

Here, an example of a fire signal and an abnormal signal will be described.
FIG. 3A shows fire signals during normal times and fires, and FIG. 3B shows abnormal signals when troubles occur in the fire detector.
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. It is configured by changing continuously.
The abnormal signal output by the fire detector 2A is the same as the fire signal in a pulse with a short width (predetermined width) from about 24 (V) of the normal detector line 3 where there is no fire, every predetermined time. A signal configured by intermittently changing the voltage may be employed.
If the operation of the fire detector 2 is not affected, a signal configured by continuously changing the voltage value of the abnormal signal to, for example, 18V may be employed.

  The receiving circuit 10 determines that an abnormal signal is received when the voltage of the sensor line 3 changes every predetermined time to about 8 (V) with a predetermined width, and the determination circuit 13 detects other fire detection. The fact that the device 2 is abnormal is output.

  The constant voltage circuit 11 converts a power supply voltage supplied from the fire receiver 1 through the sensor line 3 into a predetermined voltage value, for example, 5 (V), and supplies the converted voltage to each circuit of the fire detector 2B. Is. The constant voltage circuit 11 is composed of, for example, a constant voltage IC.

The detection circuit 14 detects heat, smoke, flame, etc. caused by a fire, compares the detection value with a fire threshold value to determine whether or not a fire is detected, and outputs a detection result to the determination circuit 13. The detection circuit 14 is connected to the determination circuit 13.
In addition, the detection circuit 14 detects its own malfunction by the output value monitoring method, and when it detects the malfunction, outputs to the discrimination circuit 13 that it is abnormal.
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.

  When a fire occurrence is output from the detection circuit 14, the determination circuit 13 determines that a fire has occurred, controls the switching circuit 12, and outputs a fire signal to the fire receiver 1. Further, the determination circuit 13 turns on the operation indicator lamp 17. In addition, when the occurrence of a malfunction is output from the detection circuit 14, the determination circuit 13 blinks the operation indicator lamp 17 as a display means for displaying and identifying that there is a malfunction on its own.

  Further, the discrimination circuit 13 outputs its own abnormality output from the detection circuit 14 and other fire detectors output from the other fire detectors 2 and output via the sensor line 3 and the receiving circuit 10. The disconnection circuit 15 is controlled based on the output of the abnormality of 2.

  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 discriminates that any of the fire detectors 2 is defective, the discrimination circuit 13 outputs an output corresponding to the discrimination result, and the disconnection circuit 15 that receives the output outputs the sensor circuit 3 and the termination resistor R. The operation of disconnecting, connecting after a predetermined time elapses, and disconnecting again after a predetermined time elapses is repeated. As described above, when the connection between the sensor line 3 and the terminating resistor R is intermittently disconnected by the disconnection circuit 15, the sensor line 3 repeats the disconnection state and the normal state, and the disconnection detection circuit of the fire receiver 1. The fire receiver 1 repeats the notification of the disconnection alarm and the notification stop (normal state) by the disconnection alarm issuing means that is detected by This disconnecting circuit 15 is connected to the common line 3A and has a terminal resistor R connection. The disconnection detection circuit of the fire receiver 1 determines that the sensor line 3 is disconnected when a weak current stops flowing through the sensor line 3 due to the terminating resistor R.

  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 2B 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.

The determination circuit 13 provided in the fire detector 2A determines whether or not the fire detector 2A is defective based on the output of the occurrence of the defect from the detection circuit 14. 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.
Thereby, the fire detector 2A outputs an abnormal signal via the sensor line 3 to the terminal fire detector 2B. 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 generating means intermittently disconnects the terminal resistance R in the case of a malfunction of the fire detector 2 so that it can be distinguished from the case of disconnection.

  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) When the determination circuit 13 determines that there is no termination resistance R, the determination circuit 13 operates as a fire detector 2A without the termination resistance R, and when it is determined that the termination resistance R exists, the termination resistance R is generated. It operates as a fire detector 2B. 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, when it is determined that there is a problem from the output 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.
On the other hand, the discrimination circuit 13 provided in the fire detector 2B operates to change the impedance of the sensor line 3 by controlling the switching circuit 12 even if the discrimination circuit 13 determines that it is defective from the output of the detection circuit 14. Do not implement. That is, the determination circuit 13 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 that the connection between the sensor line 3 and the termination resistor R is intermittently disconnected.
When the discrimination circuit 13 of the fire detector 2B detects a failure of the fire detector 2B itself by the output of the detection circuit 14, the discrimination circuit 13 connects the disconnect circuit 15 to the sensor line 3 and the terminating resistor R. Control to disconnect intermittently.

(6) When the fire receiver 1 detects that the terminating resistor R has been disconnected from the sensor line 3, that is, the sensor line 3 has been disconnected, by the disconnection detection circuit, the fire receiver 1 is disconnected on its board in the disaster prevention center. A message to that effect is displayed, and the fire receiver 1 outputs a voice or display to that effect and issues a disconnection alarm. Here, when the disconnection of the sensor line 3 is the disconnection of the termination resistor R by the fire detector 2B, the disconnection of the sensor line 3 and the disconnection recovery (normal state) are repeated, so the fire receiver 1 is disconnected. Alerts intermittently. Also, if the disconnection of the sensor line 3 is due to the disconnection of the wiring of the sensor line 3, the disconnection continues, so the fire receiver 1 continuously issues a disconnection alarm. Thereby, the abnormality of the fire detector 2 and the disconnection of the wiring of the detector line can be determined.

(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.

[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 and the sensor line 3 intermittently. That is, the discrimination circuit 13 of the fire detector 2B intermittently disconnects the connection between the sensor line 3 and the termination resistor R, and disconnects the sensor line 3. Thereby, even the P-type fire receiver 1 can detect the intermittent disconnection of the sensor line 3 as an abnormal signal, and can know the malfunction of the fire detector 2. 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 (5)

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;
With
Disconnection generating means for intermittently disconnecting the sensor line when the abnormal signal is output is connected to the sensor line,
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. In the termination device connected to the fire receiver via the sensor line to which the fire detector is connected,
A termination element;
Receiving means for receiving an abnormality signal the fire detector is output when the fire detector detects its own malfunction by self-inspection,
A termination device comprising: disconnecting means for intermittently disconnecting the sensor line by intermittently disconnecting the termination element when the receiving means receives the abnormal signal. . 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;
When a termination element connected to the sensor line is mounted, the termination unit is intermittently disconnected from the sensor line when the receiving means receives the abnormal signal, thereby disconnecting the sensor line. A fire detector characterized by comprising: a disconnecting means for disconnecting automatically.   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 4, wherein the separating means separates the termination element.

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