JP6471956B2 - Automatic fire alarm system slave unit and automatic fire alarm system using the same - Google Patents

Description

  The present invention generally relates to a slave unit of an automatic fire notification system, and an automatic fire notification system using the same, and more particularly, to a slave unit of an automatic fire notification system electrically connected to a master unit via a pair of electric wires. And an automatic fire alarm system using the same.

  Conventionally, a P-type (proprietary-type) automatic fire notification system exists as an automatic fire notification system (self-fire notification system). The P-type automatic fire alarm system detects the occurrence of a fire in a slave unit consisting of a heat detector, smoke detector, flame detector, etc., and notifies the master unit consisting of a receiver of the fire occurrence. It is configured to be.

  In the P-type automatic fire alarm system, a slave unit electrically short-circuits between a pair of electric wires, thereby notifying a master unit composed of a receiver of the occurrence of a fire.

  In addition, as an automatic fire notification system, there is a system having a function of interlocking with other devices such as smoke prevention equipment and emergency broadcasting equipment. In this type of automatic fire alarm system, the slave unit has a function of generating a linkage report for linking other devices, and the master unit receives the linkage report from the slave unit, thereby Execute synchronization.

  By the way, for example, in Patent Document 1, as a P-type automatic fire alarm system, a system in which a plurality of fire detectors as slave units are connected to a plurality of sensor lines derived from a fire receiver as a master unit. Is disclosed. In the automatic fire notification system described in Patent Document 1, the slave unit performs a fire detection operation using the power supplied from the fire receiver, and outputs a fire report to the master unit when a fire is detected.

JP 2002-8154 A

  Usually, each of the plurality of slave units provided in the P-type automatic fire notification system performs a fire detection operation at a predetermined time period based on a clock source provided in the own unit. Therefore, there is a possibility that a plurality of slave units perform a fire detection operation in the same time zone. If it does so, since electric power required for operation | movement of each of several subunit | mobile_unit concentrates in the time slot | zone, a large amount of electric current will flow into a pair of electric wire in the time slot | zone. In such a situation, the master unit may erroneously detect a fire report due to a change in current consumed.

  Then, this invention is made | formed in view of the said problem, The objective is the subunit | mobile_unit of the automatic fire alarm system which can suppress the increase in the electric current consumed in the same time slot | zone, and an automatic fire alarm using the same. To provide a system.

Therefore, the present invention is a slave unit of an automatic fire alarm system electrically connected to a pair of electric wires to which a voltage is applied, the storage unit storing identification information unique to the own unit, and the pair A communication unit that receives a synchronization signal transmitted from a parent device in order to synchronize with another child device, and is represented by a change in a voltage applied to the electric wire of the first and second terminals. When a signal is received, a processing unit that performs a fire detection operation using electric power supplied from the parent device in an operation time zone assigned according to the identification information stored in the storage unit. In the alarm detection section having the total time length of the operation time zone allocated to each of the own device and the other slave units, the processing unit performs a fire in the operation time zone assigned according to the identification information. Detection, and the communication unit is controlled by the processing unit. The result of the fire detection is transmitted through the pair of electric wires, and is a section different from the alarm detection section, and the total time of the response time zone assigned to each of the own device and the other slave devices It has a length, among the response interval in which the master unit makes a response to the request signal transmitted in response time zone allocated in accordance with the identification information, the communication unit, the power supplied from the base unit And transmitting a transmission signal corresponding to the request signal to the base unit.

  Moreover, the automatic fire alarm system of this invention is equipped with said subunit | mobile_unit and the main | base station which applies a voltage between a pair of said electric wire, It is characterized by the above-mentioned.

  According to this structure, the subunit | mobile_unit of an automatic fire alerting | reporting system and the automatic fire alerting | reporting system using the same can suppress the increase in the electric current consumed in the same time slot | zone.

It is a figure explaining the schematic structure of the automatic fire alarm system of Embodiment 1. It is a figure explaining the whole structure of the automatic fire alarm system of Embodiment 1. It is a figure explaining the structure of the transmission circuit which the subunit | mobile_unit of Embodiment 1 has. It is a flowchart explaining operation | movement of the subunit | mobile_unit of Embodiment 1. FIG. FIG. 5A and FIG. 5B are diagrams for explaining the allocation of the operation time period in the first embodiment. It is a figure explaining the change of the electric current which the subunit | mobile_unit of Embodiment 1 draws. It is a flowchart explaining operation | movement of the subunit | mobile_unit of Embodiment 2. FIG. FIG. 8A and FIG. 8B are diagrams illustrating the assignment of the operation time zone and the response time zone in the second embodiment. It is a figure explaining the change of the electric current which the subunit | mobile_unit of Embodiment 2 draws. It is a flowchart explaining operation | movement of the subunit | mobile_unit of Embodiment 3. FIG. 11A and FIG. 11B are diagrams for explaining assignment of operation time zones and response time zones in the third embodiment.

1. Embodiment 1
Hereinafter, the automatic fire alarm system A1 of this embodiment will be described.

1.1 Overview As shown in FIG. 1, the automatic fire alarm system A1 according to the present embodiment includes at least one slave unit 10 and one master unit 20.

  The base unit 20 includes an application unit 21 that applies a voltage between the pair of electric wires 51 and 52.

  The subunit | mobile_unit 10 is electrically connected to a pair of electric wires 51 and 52, and is provided with the communication part 14, the memory | storage part 17, and the process part 19. FIG.

  The storage unit 17 is configured to store identification information unique to the own device.

  The communication unit 14 is configured to receive a synchronization signal transmitted from the parent device 20 in order to synchronize with another child device 10 due to a change in voltage applied to the pair of electric wires 51 and 52.

  When the communication unit 14 receives the synchronization signal, the processing unit 19 is configured to perform a fire detection operation in an operation time zone assigned according to the identification information stored in the storage unit 17.

  In other words, each of the slave units 10 of the automatic fire notification system A1 according to the present embodiment performs a fire detection operation in an operation time zone assigned to the own unit.

  Therefore, in the automatic fire alarm system A1 of the present embodiment, since the number of slave units 10 that perform the fire detection operation in the same time zone can be limited, an increase in power consumed in the same time zone, that is, There is an advantage that an increase in consumed current can be suppressed.

  Hereinafter, the automatic fire alarm system A1 according to the present embodiment will be described in detail. However, the configuration described below is only an example of the present invention, and the present invention is not limited to the following embodiment, and the technical idea according to the present invention is not deviated from this embodiment. Various changes can be made in accordance with the design or the like as long as they are not.

1.2 Overall Configuration In this embodiment, a case where the automatic fire notification system A1 is used for an apartment house (apartment) is illustrated. However, the automatic fire notification system A1 is not limited to an apartment house, but may be a commercial facility, a hospital, a hotel, for example. It can be applied to various buildings such as multi-tenant buildings.

  In the automatic fire alarm system A1 of the present embodiment, as shown in FIG. 2, one master unit 20 and a plurality of slave units B1, B2, B3,. And are provided. When each of the plurality of slave units B1, B2, B3,... Is not particularly distinguished, it is simply referred to as “slave unit 10”.

  Furthermore, in this automatic fire alarm system A1, a pair of electric wires 51 and 52 are wired for every floor (floor) of the 1st to 4th floors. In short, four sets of two sets of one set (two-wire type) of electric wires 51 and 52 are provided in the entire apartment house 60. Here, a maximum of 40 to 80 slave units 10 can be connected to each pair of electric wires 51 and 52. In addition, a maximum of 50 to 200 lines (50 to 200 sets) of a pair of electric wires 51 and 52 can be connected to one base unit 20. Therefore, for example, when a maximum of 40 cordless handsets 10 can be connected to each set of electric wires 51 and 52 and a maximum of 50 pairs of wires 51 and 52 can be connected to one master phone 20, the cordless handset 10 can be connected to a maximum of 2000 (= 40 × 50) units per master unit 20. In addition, these numerical values are an example, Comprising: It is not the meaning limited to these numerical values.

  In addition, the pair of electric wires 51 and 52 are electrically connected via a terminal resistor 40 at the end of the pair of electric wires 51 and 52 (the end on the opposite side to the base unit 20). Therefore, the base unit 20 can detect the disconnection of the pair of electric wires 51 and 52 by monitoring the current flowing between the pair of electric wires 51 and 52. However, the termination resistor 40 is not an essential configuration and may be omitted.

  The automatic fire alarm system A1 basically detects the occurrence of a fire in the slave unit 10 including a heat detector, a smoke detector, a flame detector, and the like, and transfers the slave unit 10 to the master unit 20 as a receiver. Fire notification (fire report) is made. However, the subunit | mobile_unit 10 may contain not only the sensor which detects generation | occurrence | production of a fire but a transmitter. The transmitter has a push button switch (not shown), and when a person detects a fire, manually operates the push button switch to notify the master 20 of the occurrence of a fire (fire report). It is.

  Further, when the master unit 20 receives the notification (interlocking report) for interlocking the other device 30 from the slave unit 10, the automatic fire alarm system A1 causes the other device 30 such as smoke prevention equipment and emergency broadcast facility to be connected. Has an interlocking function for interlocking. For this reason, the automatic fire notification system A1 can control the fire door of the smoke prevention facility or notify the occurrence of the fire by sound or voice in the emergency broadcasting facility when a fire occurs.

  The other device 30 is configured to be able to communicate with the parent device 20 by, for example, a wired connection, and is configured to be linked to the automatic fire notification system A1 in response to an instruction from the parent device 20. The other devices 30 herein include various devices such as fire prevention facilities such as fire doors and smoke exhaust facilities, emergency broadcast facilities, external transfer devices, and fire extinguishing facilities such as sprinklers. It is not limited to (facility). The external transfer device is a device that notifies external parties, fire fighting organizations, security companies, and the like.

  By the way, a general automatic fire notification system includes a P-type (proprietary-type) system. In the P-type automatic fire alarm system, the slave unit notifies the master unit of the occurrence of fire by electrically short-circuiting the pair of electric wires.

  The automatic fire alarm system A1 of this embodiment is based on the P type. More specifically, in this embodiment, in the housing complex where the P-type automatic fire alarm system was installed, the existing wiring (the electric wires 51 and 52) is used as it is, and the receiver (the main unit 20) and the child are used. Assume that the machine (child machine 10) is replaced. Note that the automatic fire notification system A1 of the present embodiment can also be adopted as a newly introduced automatic fire notification system.

1.3 Configuration of Base Unit 20 In the present embodiment, the base unit 20 receives P-type reception from the slave unit 10 (fire report) and a notification (link report) for interlocking other devices 30. Machine. The base unit 20 is installed, for example, in a management room of a building (a collective housing 60).

  As shown in FIG. 1, the base unit 20 includes an application unit 21, a resistor 22, a reception unit 23, a transmission unit 24, a display unit 25 that performs various displays, and an operation that receives an operation input from a user. A unit 26 and a processing unit 27 for controlling each unit.

  The resistor 22 is connected between the applying unit 21 and at least one of the pair of electric wires 51 and 52. In the example of FIG. 1, the resistor 22 is inserted between one (high potential side) of the pair of electric wires 51, 52 and the application unit 21. However, not limited to this example, the resistor 22 may be inserted between the other (low potential side) electric wire 52 and the application unit 21, or both the pair of electric wires 51 and 52 and the application unit 21. Between them.

  The receiving unit 23 receives a voltage signal obtained by converting a current signal from the slave unit 10 into a voltage change on the pair of electric wires 51 and 52 due to a voltage drop at the resistor 22.

  The transmission unit 24 periodically transmits a synchronization signal to the child device 10.

  When receiving a fire occurrence notification (fire report) from the slave unit 10, the master unit 20 displays the location of the fire occurrence on the display unit 25.

  The processing unit 27 has a microcomputer as a main component, and implements a desired function by executing a program stored in a memory (not shown). Note that the program may be written in the memory in advance, or may be provided by being stored in a storage medium such as a memory card. Specifically, the processing unit 27 controls the transmission unit 24 to transmit the transmission signal and the synchronization signal.

  Master device 20 also has an interlocking unit 28 for interlocking with other device 30. As a result, when the master unit 20 receives the interlocking report from the slave unit 10, the master unit 20 can issue an instruction to the other device 30 from the interlocking unit 28 to interlock the other device 30.

  As described above, the base unit 20 applies the voltage between the pair of electric wires 51 and 52 from the applying unit 21, thereby including the slave unit 10 connected to the pair of electric wires 51 and 52. Functions as a power supply for the entire operation. Here, as an example, the voltage applied by the application unit 21 between the pair of electric wires 51 and 52 is 24 V DC, but the present invention is not limited to this value.

  Furthermore, the main unit 20 includes a standby power source 29 using a storage battery so that a power source for the operation of the automatic fire alarm system A1 can be secured even in the event of a power failure. The main unit 20 uses a commercial power source, a private power generation facility, etc. (not shown) as a main power source. The application unit 21 automatically switches the power supply source from the main power source to the standby power source 29 when the main power source is interrupted, and automatically switches from the standby power source 29 to the main power source when the main power source is restored. The spare power supply 29 has a capacity and other specifications determined so as to satisfy the standards defined by the ministerial ordinance.

  In addition, the resistor 22 has a first function for converting the current signal transmitted from the slave unit 10 into a voltage signal as described above, and the pair of wires 51 and 52 when the pair of wires 51 and 52 are short-circuited. It has two functions, a second function for limiting the flowing current. In short, the resistor 22 has a first function as a current-voltage conversion element and a second function as a current limiting element. Here, as an example, the resistance value of the resistor 22 is 400Ω or 600Ω, but the value is not limited to this value.

  The receiving unit 23 and the transmitting unit 24 are electrically connected between the resistor 22 and the pair of electric wires 51 and 52. However, the receiving unit 23 is not limited to the configuration connected between the resistor 22 and the pair of electric wires 51 and 52, and may be electrically connected between the applying unit 21 and the resistor 22, for example.

  Here, the receiving part 23 receives the current signal from the subunit | mobile_unit 10 as a voltage signal (voltage change) on a pair of electric wires 51 and 52. FIG. In other words, the current value of the current drawn by the slave unit 10 from the pair of electric wires 51 and 52 (drawn current) corresponds to the magnitude of the voltage drop at the resistor 22. And interlocking reports can be received as voltage signals. In other words, the receiving unit 23 receives a voltage signal corresponding to the current value of the drawn current in the slave unit 10 as a fire report or a linked report.

  The transmission part 24 transmits the electric current signal which arises on a pair of electric wires 51 and 52 by changing the electric current which flows in from a pair of electric wires 51 and 52 to the subunit | mobile_unit 10 as a synchronizing signal. The current signal sent (generated) by the transmitter 24 onto the pair of electric wires 51 and 52 is converted into a voltage signal by a voltage drop at the resistor 22, and the slave unit 10 outputs the voltage signal as a synchronization signal from the master unit 20. Receive. In other words, the voltage change (voltage signal) generated on the pair of electric wires 51 and 52 when the transmission unit 24 changes the current flowing from the pair of electric wires 51 and 52 is received by the slave unit 10 as a voltage signal. It will be.

1.4 Configuration of Slave Unit 10 The slave unit 10 includes a diode bridge 11, a power supply circuit 12, a sensor 13, a communication unit 14, a storage unit 17, a determination unit 18, and a processing unit 19. .

  In the diode bridge 11, a pair of electric wires 51 and 52 are electrically connected to the input end side, and the power supply circuit 12 and the communication unit 14 are electrically connected to the output end side. The power supply circuit 12 generates electric power for operation of the child device 10 from electric power on the pair of electric wires 51 and 52. The sensor 13 detects the occurrence of a fire.

  The communication unit 14 includes a transmission circuit 15 and a reception circuit 16.

  The transmission circuit 15 is configured to transmit the current value of the current drawn from the pair of electric wires 51 and 52 (drawn current) to the parent device 20 as a current signal. The current signal sent (generated) on the pair of electric wires 51 and 52 by the transmission circuit 15 is converted into a voltage signal by a voltage drop at the resistor 22, and the parent device 20 receives the voltage signal as a signal from the child device 10. To do. In other words, when the transmission circuit 15 adjusts the current value of the drawing current drawn from the pair of electric wires 51 and 52, a voltage signal corresponding to the current value is received by the parent device 20.

  FIG. 3 shows a specific example of the transmission circuit 15. That is, as shown in FIG. 3, the transmission circuit 15 includes a first lead-in part 151 and a second lead-in part 152 so that current is drawn in the first lead-in part 151 and the second lead-in part 152, respectively. It is configured.

  The first lead-in portion 151 has a series circuit of a semiconductor element 153, a resistor 154, and a light emitting diode (LED: Light Emitting Diode) 155 that are electrically connected between a pair of output terminals of the diode bridge 11. The second lead-in part 152 has a series circuit of a semiconductor element 156 and a resistor 157 that are electrically connected between a pair of output terminals of the diode bridge 11.

  Here, each of the semiconductor elements 153 and 156 is made of an npn transistor, and the collector is electrically connected to the output terminal on the high potential side of the diode bridge 11. Furthermore, the emitter of the semiconductor element 153 is electrically connected to the circuit ground (the output terminal on the low potential side of the diode bridge 11) via the resistor 154 and the light emitting diode 155. The emitter of the semiconductor element 156 is electrically connected to the circuit ground (the output terminal on the low potential side of the diode bridge 11) via the resistor 157. The bases of the semiconductor elements 153 and 156 are electrically connected to the processing unit 19 described later. Note that the semiconductor elements 153 and 156 are not limited to npn transistors but may be pnp transistors, for example.

  Thereby, the transmission circuit 15 draws current in the first drawing unit 151 when the semiconductor element 153 is turned on by the processing unit 19, and the second drawing unit 152 when the semiconductor element 156 is turned on by the processing unit 19. The current is drawn with. Therefore, the transmission circuit 15 has a current drawn in current when the current is drawn only by the first lead 151 and when the current is drawn by both the first lead 151 and the second lead 152. You can change the value.

  Furthermore, by switching the base current of the semiconductor element 153 in two steps, the current value of the current drawn by the first lead-in portion 151 can be switched in two steps. Similarly, by switching the base current of the semiconductor element 156 in two stages, the current value of the current drawn by the second lead-in part 152 can be switched in two stages. In the present embodiment, the transmission circuit 15 can adjust the current value in four stages in total, that is, two stages with the first lead-in part 151 and two stages with the second lead-in part 152 in this way. Hereinafter, it is assumed that the slave unit 10 can raise the current value of the pull-in current in four stages by switching the current value of the pull-in current in the transmission circuit 15.

  Note that the transmission circuit 15 can turn on the light emitting diode 155 when the first drawing unit 151 draws current. The light-emitting diode 155 is disposed at a position that is visible from the outside of the slave unit 10 and has a function of notifying that the slave unit 10 is in a fire report state by turning on.

  The receiving circuit 16 receives the synchronization signal from the parent device 20 as a voltage signal (voltage change) on the pair of electric wires 51 and 52. That is, the current signal sent (generated) on the pair of electric wires 51 and 52 by the parent device 20 is converted into a voltage signal by the voltage drop at the resistor 22, so that the receiving circuit 16 is synchronized with the parent device 20. A voltage signal is received as a signal. In other words, the receiving circuit 16 receives, as a voltage signal, a voltage change (voltage signal) that occurs on the pair of electric wires 51 and 52 when the parent device 20 changes the current flowing from the pair of electric wires 51 and 52. become.

  The storage unit 17 stores at least identification information (address) assigned to the child device 10 in advance. That is, unique identification information is assigned to each of the plurality of slave units B1, B2, B3,. Each identification information is registered in the parent device 20 in association with each installation location (for example, a room number) of the plurality of child devices B1, B2, B3,.

  The storage unit 17 also stores determination conditions for the determination unit 18 to determine the operating state (fire report state, interlocked report state). The determination condition is, for example, a threshold set for the output of the sensor 13 or the like. Note that the identification information and the determination conditions that are pre-assigned to the child device 10 may be stored in the same storage unit 17, or a plurality of storage units 17 may be provided and stored in separate storage units 17. Good.

  The determination unit 18 determines an operation state including two states of a fire report state and a linked report state. Specifically, the determination unit 18 reads the output (sensor value) of the sensor 13 and determines the operation state by checking the determination conditions in the storage unit 17. In the present embodiment, as an example of the determination condition, when the read sensor value exceeds the first threshold, the determination unit 18 determines that the fire report state is present. When the read sensor value exceeds the second threshold value (> first threshold value), the determination unit 18 determines that the linked information state is present. However, the determination unit 18 starts the comparison between the sensor value and the second threshold value, for example, from the time when the determination of the fire report state is confirmed, so as to determine the interlocked report state after determining the fire report state. . Note that these determination conditions are merely examples, and can be changed as appropriate.

  In the present embodiment, the determination unit 18 includes three states (fire report state, interlocked report state, non-reported state) including a non-reporting state (normal state) that is neither a fire report state nor a linked report state. To determine which of the current operating states corresponds. Note that the operation state determined by the determination unit 18 is not limited to three states, but may be only two states of a fire report state and a linked report state, or may be four states or more.

  The processing unit 19 controls the transmission circuit 15 and the reception circuit 16 to transmit a current signal from the transmission circuit 15 by adjusting the current value of the drawn current according to the output of the sensor 13, or from the parent device 20. The receiving circuit 16 receives the synchronization signal. Here, the processing unit 19 has a microcomputer as a main component, and implements a desired function by executing a program stored in a memory (not shown). Note that the program may be written in the memory in advance, or may be provided by being stored in a storage medium such as a memory card.

  When the receiving circuit 16 receives the synchronization signal, the processing unit 19 starts the fire detection operation with the operation power generated by the power supply circuit 12 in the operation time zone assigned according to the identification information of the own device. To do. Specifically, the processing unit 19 causes the determination unit 18 to start reading the sensor value and determine the state in the operation time zone assigned according to the identification information of the own device, and according to the determination result of the determination unit 18 The transmitter circuit 15 is controlled to adjust the current value of the drawn current. As described above, when the determination result of the determination unit 18 is in the fire report state, the processing unit 19 adjusts the current value of the drawn current to a predetermined fire report level and generates a fire report. In addition, when the determination result of the determination unit 18 is in the linked report state, the processing unit 19 adjusts the current value of the drawn current to a predetermined linked report level and generates a linked report. Here, the interlock report level is a value (current value) different from the fire report level, and in this embodiment, the current value is larger than the fire report level (interlock report level> fire report level).

  Furthermore, in this embodiment, the processing unit 19 transmits a transmission signal representing transmission data from the transmission circuit 15 when a predetermined waiting time has elapsed after adjusting the current value of the drawn current to a predetermined fire alarm level. It is configured as follows. Specifically, the processing unit 19 is configured to transmit a transmission signal from the transmission circuit 15 by increasing or decreasing the current value of the drawn current between two values of the first level and the second level. Here, the transmission data is, for example, identification information of the slave unit 10.

  Here, it is assumed that the first level is the same value as the fire alert level, and the second level is greater than the fire alert level and smaller than the interlock alert level (fire alert level = first level <second level). <Linked report level). In short, since the handset 10 increases or decreases the current value of the drawn current based on the fire report level, it is possible to transmit a transmission signal in the fire report state.

  With this configuration, when the child device 10 determines that a fire has occurred and a fire report state has occurred, the slave unit 10 generates a fire report by adjusting the current value of the drawn current to the fire report level. Further, when determining that the slave unit 10 is in the interlocking report state, the slave unit 10 generates the interlocking report by adjusting the current value of the drawn current to the interlocking report state. Further, in the fire report state, the slave unit 10 transmits a transmission signal representing the identification information by increasing or decreasing the current value of the drawn current between the first level (fire report level) and the second level.

  In the present embodiment, the slave unit 10 transmits data including at least the identification information stored in the storage unit 17 to the master unit 20 by communication using a transmission signal. Therefore, in the master unit 20, after receiving the fire report from the slave unit 10, the slave unit 10 that is the reporting source can be specified from the identification information represented by the transmission signal.

  In the present embodiment, the determination unit 18 and the processing unit 19 are configured separately. However, the determination unit 18 and the processing unit 19 are not limited to this example, and may be configured as a single unit.

1.5 Operation Hereinafter, the operation of the automatic fire alarm system A1 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the child device 10.

  First, at the time of non-reporting (normal time), the main unit 20 applies a constant voltage (for example, DC 24V) between the pair of electric wires 51 and 52 from the applying unit 21.

  The processing unit 19 of the child device 10 determines whether or not the receiving circuit 16 has received the synchronization signal transmitted from the parent device 20 (step S5).

  When determining that it has been received (“Yes” in step S5), the processing unit 19 determines whether or not an operation time period corresponding to the identification information of the own device has arrived (step S10).

  When determining that the operating time zone has arrived (“Yes” in step S10), the processing unit 19 starts the operation of fire detection using the operating power generated by the power supply circuit 12.

  The fire detection operation will be described below.

  The determination unit 18 reads the sensor value (step S15) and determines whether or not it is in a fire report state (step S20). In the non-reporting state, handset 10 basically does not draw current, and the current value of the drawn current is 0 (zero). Therefore, if the child device 10 performing the fire detection operation is in a non-reporting state, the current flowing through the pair of electric wires 51 and 52 is necessary for the current flowing through the termination resistor 40 and the child device 10 to operate. The sum of the currents. Therefore, it is unlikely that base unit 20 erroneously detects the fire report based on the current value of the current flowing through the pair of electric wires 51 and 52 in the non-reporting state.

  When the determination unit 18 determines that the state is a fire report state (“Yes” in step S20), the processing unit 19 increases the current value of the drawn current to adjust to the fire report level (step S25). This generates a fire report.

  When a predetermined waiting time elapses from when the current value of the drawn current is increased, the processing unit 19 transmits a transmission signal representing the identification information of the own device from the transmission circuit 15 (step S30). Thereby, the subunit | mobile_unit 10 can transmit the identification information of an own unit to the main | base station 20. FIG.

  Then, the determination part 18 reads a sensor value (step S35), and determines whether it is an interlocking report state (step S40).

  When determining that the state is the interlocking state (“Yes” in Step S40), the processing unit 19 increases the current value of the pull-in current and adjusts it to the interlocking report level (Step S45).

  The processing unit 19 determines whether or not the operation time period has ended after raising the current value of the pull-in current and adjusting it to the interlocking report level (step S50). If it is determined that the processing has ended (“Yes” in step S50), the processing unit 19 returns to step S5 and waits for reception of a synchronization signal.

  When determining that it is not the fire report state (“No” in step S20), the processing unit 19 determines whether or not the operation time period has ended (step S60). If it is determined that the processing has been completed (“Yes” in step S60), the processing unit 19 returns to step S5 and waits for reception of a synchronization signal. If it is determined that the process has not been completed (“No” in step S60), the process returns to step S15, and the determination unit 18 reads the sensor value.

  When determining that it is not the interlocking report state (“No” in step S40), the processing unit 19 determines whether or not the operation time period has ended (step S65). If it is determined that the processing has ended (“Yes” in step S65), the processing unit 19 returns to step S5 and waits for reception of a synchronization signal. If it is determined that the process has not been completed (“No” in step S65), the process returns to step S35, and the determination unit 18 reads the sensor value.

1.6 Specific Example The operation time zone allocation in the present embodiment will be described with reference to FIGS. 5A and 5B.

  In the present embodiment, as shown in FIG. 5A, the entire interval (detection operation interval) Ta from when the synchronization signal is transmitted until all the slave units 10 operate is the synchronization signal transmission interval Ta1 and the notification. It consists of detection section Ta2. The notification detection section Ta2 is composed of operation time zones T1, T2,..., T64 having the same time length. That is, the time length of the notification detection section Ta2 is the total time length of the operation time zones T1, T2,. Here, it is assumed that there are a total of 64 slave units 10 including slave units B1, B2,..., B64, and each slave unit 10 has operating time zones T1, T2, and T2 according to its own identification information. ..., one operating time zone of T64 is assigned one-to-one.

  FIG. 5B is a diagram illustrating the transition of the fire detection operation. As described above, one operating time zone is assigned to the 64 slave units 10 on a one-to-one basis. When all the 64 slave units 10 receive the synchronization signal from the master unit 20 in the transmission section Ta1, the slave unit B1 performs a fire detection operation in the operation time period T1, and the slave unit B2 detects the fire in the operation time period T2. Perform the operation. Thereafter, in each operation time zone, the handset 10 to which the operation time zone is assigned sequentially performs the fire detection operation, and in the last operation time zone T64, the handset B64 performs the fire detection operation. Each child device 10 performs a fire detection operation in an operation time zone corresponding to its own identification information, and enters a standby state in the other operation time zone. For example, the slave unit B1 is in a standby state in the operation time periods T2 to T64 other than the operation time period T1 in which the own device performs the fire detection operation. In the child device B2, the device enters a standby state in operation time zones T1, T3 to T64 other than the operation time zone T2 in which the own device performs the fire detection operation.

  Next, a change in current drawn by the slave unit 10 in one operation time zone will be described with reference to FIG.

  FIG. 6 represents a change in the current value flowing through the pair of electric wires 51 and 52 with the horizontal axis representing time and the vertical axis representing the current value. A section (time length) from time t0 to time t5 shown in FIG. 6 is one operation time zone. In FIG. 6, the handset 10 can switch the current value of the pull-in current so that the current value of the current flowing through the pair of electric wires 51 and 52 can be stepped up in three steps from the base current I0 to I1, I2 and I3. (I0 <I1 <I2 <I3). Here, the base current is a current flowing through the slave unit 10 when the slave unit 10 is in a non-reporting state.

  The current value of the current flowing through the pair of electric wires 51 and 52 is basically “I0” as shown in FIG. In the example of FIG. 6, the operating child device 10 is in a non-reporting state during the period of time t0 to t1.

  When the result of the fire detection in the slave unit 10 shifts from the non-reporting state to the fire reporting state, the current value of the current flowing through the pair of electric wires 51 and 52 increases from “I0” to “I1” as shown in FIG. To do. In the example of FIG. 6, it has shown that the subunit | mobile_unit 10 is detecting the fire report state in the period of time t1-t4.

  Furthermore, when a predetermined waiting time Wa elapses from when the slave unit 10 increases the current value to the current value I0 indicating the fire alarm level, the slave unit 10 sets the current value of the drawn current between the first level and the second level. The transmission signal representing the transmission data is transmitted from the transmission circuit 15 by increasing / decreasing the signal. In the example of FIG. 6, during the period from time t2 to t3, the slave unit 10 transmits a transmission signal, and the current value of the current flowing through the pair of electric wires 51 and 52 increases or decreases between “I1” and “I2”. To do.

  Thereafter, when the determination result in the slave unit 10 shifts from the fire report state to the linked report state, the current value of the current flowing through the pair of electric wires 51 and 52 increases from “I2” to “I3” as shown in FIG. In the example of FIG. 6, the slave unit 10 is in the interlocking report state during the period from time t4 to t5.

  In the present embodiment, as an example, the fire report level is assumed to be 20 mA to 25 mA, the interlocking report level is assumed to be about 40 mA to 45 mA, and the difference between the first level and the second level when transmitting the transmission signal is 13 mA to 18 mA. It is assumed that the degree. As another example, the fire report level is assumed to be 5 mA to 8 mA, the linked report level is assumed to be about 15 mA to 20 mA, and the difference between the first level and the second level when transmitting the transmission signal is about 5 mA to 13 mA. It may be assumed.

  The time length of the detection operation section Ta is assumed to be about 1 second. Then, when the total number of the slave units 10 is 64, the operation time zone assigned to each slave unit 10 is assumed to be about 15 milliseconds.

  However, these specific numerical values are not intended to limit the embodiment, and can be appropriately changed. For example, in the present embodiment, the current value of the drawn current is allowed to vary within a predetermined allowable range. If it is in each tolerance | permissible_range in the main | base station 20, it can be distinguished whether the operation | movement state of the subunit | mobile_unit 10 at that time is a fire report state or an interlocking report state.

1.7 Summary As described above, the slave unit 10 of the automatic fire alarm system A1 in the present embodiment is electrically connected to the pair of electric wires 51 and 52 to which a voltage is applied. The subunit | mobile_unit 10 is provided with the memory | storage part 17, the communication part 14, and the process part 19. FIG. The memory | storage part 17 has memorize | stored the identification information intrinsic | native to an own machine, and the communication part 14 is a signal represented by the change of the voltage applied to a pair of electric wires 51 and 52, Comprising: The synchronization signal transmitted from the parent device 20 is received in order to synchronize with. When the synchronization signal is received by the communication unit 14, the processing unit 19 detects the fire using the power supplied from the parent device 20 in the operation time zone assigned according to the identification information stored in the storage unit 17. Perform the operation.

  According to this structure, the subunit | mobile_unit 10 performs the operation | movement of a fire detection using the electric power supplied from the main | base station 20 in the operation time zone allocated according to the identification information of the own unit. Therefore, the power consumed by each slave unit 10, that is, the current consumed by each slave unit 10, is distributed. Therefore, automatic fire alarm system A1 using cordless handset 10 can suppress an increase in current consumption in the same operation time zone.

  Here, the communication part 14 is provided with the transmission circuit 15 which transmits the signal according to the operation | movement of fire detection by changing the electric current drawn from a pair of electric wires 51 and 52. FIG. The transmission circuit 15 transmits a fire report signal for notifying the occurrence of a fire and an interlock report signal for interlocking with other devices by a fire detection operation. The first current value I1 of the current drawn from the pair of electric wires by the transmission circuit 15 when transmitting the fire report signal and the second current of the current drawn from the pair of electric wires by the transmission circuit 15 when transmitting the signal of the interlocking signal It is preferably different from the value I3.

  According to this structure, the subunit | mobile_unit 10 can distinguish and transmit a fire report and an interlocking report.

  Here, the communication part 14 is provided with the transmission circuit 15 which transmits the signal of the fire report which alert | reports generation | occurrence | production of a fire by changing the electric current drawn from a pair of electric wires 51 and 52 in the operation | movement of a fire detection. It is preferable that the transmission circuit 15 further transmits an identification signal representing identification information when a predetermined waiting time has elapsed since the fire report was transmitted.

  According to this configuration, the slave unit 10 transmits the transmission signal indicating the identification information when a predetermined waiting time has elapsed from the time when the fire report is transmitted, so the source device that transmitted the fire report is notified to the master unit 20. can do.

  Moreover, it is preferable that automatic fire alarm system A1 in this embodiment is equipped with said subunit | mobile_unit 10 and the main | base station 20 which applies a voltage between a pair of said electric wire.

  According to this structure, the subunit | mobile_unit 10 of an automatic fire alerting | reporting system performs the operation | movement of a fire detection using the consumption current supplied from the main | base station 20 in the operation time zone allocated according to the identification information of the own unit. Therefore, automatic fire alarm system A1 using cordless handset 10 can suppress an increase in current consumption in the same operation time zone.

2. Embodiment 2
The automatic fire alarm system A1 in the present embodiment will be described with a focus on differences from the first embodiment. The basic configuration of the automatic fire alarm system A1 of the present embodiment is the same as that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  In the first embodiment, when the slave unit 10 operating in the operating time zone transmits a fire report to the master unit 20, a transmission signal is transmitted after a predetermined time has elapsed from the transmission, that is, communication using the transmission signal is performed in the operating time zone. ing. The point from which the subunit | mobile_unit 10 of automatic fire alerting | reporting system A1 of this embodiment communicates with the main | base station 20 in the area different from an alert detection detection area is a point different from Embodiment 1. FIG.

2.1 Configuration First, the transmission unit 24 of the parent device 20 of the present embodiment will be described.

  The transmission unit 24 of the parent device 20 includes a first transmission circuit (not shown) that transmits a synchronization signal and a second transmission circuit (not shown) that transmits a request signal. The first transmission circuit of the transmission unit 24 periodically transmits a synchronization signal. Since the method for transmitting the synchronization signal is the same as that in the first embodiment, description thereof is omitted here. The 2nd transmission circuit of the transmission part 24 transmits the request signal which requests | requires the response from each of several subunit | mobile_unit 10 to several subunit | mobile_unit 10 regularly at a timing different from a synchronizing signal. Specifically, the transmission unit 24 transmits the request signal by changing the current flowing from the pair of electric wires 51 and 52. Here, the request signal is a signal for confirming survival, for example.

  Next, the subunit | mobile_unit 10 of this embodiment is demonstrated.

  The receiving circuit 16 of the child device 10 periodically receives a request signal in addition to the synchronization signal at a timing different from the reception of the synchronization signal. Specifically, the receiving circuit 16 receives the request signal from the parent device 20 as a voltage signal (voltage change) on the pair of electric wires 51 and 52.

  When the request signal is received by the reception circuit 16, the transmission circuit 15 of the child device 10 transmits a current signal generated by drawing current from the pair of electric wires 51 and 52 to the parent device 20 as a transmission signal. Here, the transmission signal is transmission data representing the identification information of the own device.

  When the request signal is received by the reception circuit 16, the processing unit 19 of the child device 10 transmits the transmission signal from the transmission circuit 15 in the response time zone assigned according to the identification information of the own device.

2.2 Operation Hereinafter, the operation of the automatic fire alarm system A1 according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the operation of the child device 10.

  In the present embodiment, the base unit 20 periodically transmits a request signal.

  The processing unit 19 of the child device 10 determines whether or not the reception circuit 16 has received the request signal transmitted from the parent device 20 (step S100).

  When determining that it has been received (“Yes” in step S100), the processing unit 19 determines whether or not a response time zone corresponding to the identification information of the own device has arrived (step S105).

  When determining that the response time zone has arrived (“Yes” in step S105), the processing unit 19 transmits a response signal from the transmission circuit 15 by raising the current value of the drawn current (step S110).

  Thereafter, the processing unit 19 performs a fire detection process (step S115). Here, since the fire detection process is the same as the process shown in FIG. 4, detailed description thereof is omitted here. In the fire detection process, the processing unit 19 of the slave unit 10 returns to step S100 when the operation time zone assigned to the slave unit 10 ends. Further, the processing unit 19 of the present embodiment performs step S35 after executing step S25 shown in FIG. That is, transmission signals are not transmitted during the operation time period.

2.3 Specific Example In this embodiment, as shown in FIG. 8A, the entire period from when the request signal and the synchronization signal are transmitted to when all the slave units 10 operate is the communication period Tb and the detection operation period. It consists of Ta. The communication section Tb includes a request signal transmission section Tb1 and a response section Tb2. The response section Tb2 includes response time zones TT1, TT2,..., TT64 having the same time length. That is, the time length of the response section Tb2 is the total time length of the operation time zones TT1, TT2,. Here, as in the first embodiment, there are 64 slave units 10, and each slave unit 10 has a response time zone TT1, TT2,. One operation time zone is assigned one-to-one. Note that the configuration of the detection operation section Ta is the same as that of the first embodiment, and thus the description thereof is omitted here.

  FIG. 8B is a diagram for explaining the transition of the response operation and the fire detection operation. Since the transition of the fire detection operation is the same as the transition shown in FIG. 5B, the description thereof is omitted here.

  Here, the transition of the response operation will be described.

  When a request signal is received from the parent device 20 in the transmission section Tb1, the child device B1 performs a response operation in the response time zone TT1, and the child device B2 performs a response operation in the response time zone TT2. Thereafter, in each response time zone, the slave unit 10 to which the response time zone is assigned sequentially performs a response operation, and the slave unit B 64 performs a response operation in the last response time zone TT64. That is, it can be seen that each slave device 10 performs a response operation when a waiting time determined by the identification information of the own device has elapsed.

  Next, changes in current drawn by the slave unit 10 in one response time zone and one operation time zone will be described with reference to FIG.

  FIG. 9 represents a change in the current value flowing through the pair of electric wires 51 and 52 with the horizontal axis representing time and the vertical axis representing the current value. Here, a section (time length) from time t0 to t3 shown in FIG. 9 is one response time zone, and a section (time length) from time t4 to t7 is one operation time zone. In FIG. 9, the handset 10 can switch the current value of the pull-in current so that the current value of the current flowing through the pair of electric wires 51 and 52 can be increased stepwise in three steps from the base currents I0 to I4, I1 and I3. (I0 <I4 <I1 <I3).

  The current value of the current flowing through the pair of electric wires 51 and 52 is basically “I0” as shown in FIG.

  When the handset 10 receives the request signal from the base unit 20, the response signal is transmitted when the waiting time Wb elapses from the start time from the response section Tb2, that is, when the response time zone assigned according to the identification information of the own device arrives. (See times t1 to t2 in FIG. 9). Specifically, the subunit | mobile_unit 10 transmits a response signal from the transmission circuit 15 by increasing / decreasing the electric current value of drawing current between the binary value of electric current value I0 and electric current value I4.

  After that, when the operation time zone assigned to the aircraft arrives at time t4, the fire detection operation is started.

  When the result of the fire detection in the slave unit 10 shifts from the non-reporting state to the fire reporting state, the current value of the current flowing through the pair of electric wires 51 and 52 increases from “I0” to “I1” as shown in FIG. To do. In the example of FIG. 9, it has shown that the subunit | mobile_unit 10 is detecting the fire report state in the period of time t5-t6.

  When the judgment result in the slave unit 10 shifts from the fire report state to the linked report state, the current value of the current flowing through the pair of electric wires 51 and 52 increases from “I1” to “I3” as shown in FIG. 9 (FIG. 9). Time t6 to t7).

  In the present embodiment, as an example, the total time length of the detection operation section Ta and the communication section Tb is assumed to be about 1 second. Then, when the total number of slave units 10 is 64, each of the operation time zone and the response time zone assigned to each slave unit 10 is assumed to be about 7 milliseconds.

  However, these specific numerical values are not intended to limit the embodiment, and can be appropriately changed. For example, in the present embodiment, the current value of the drawn current is allowed to vary within a predetermined allowable range. If it is in each tolerance | permissible_range in the main | base station 20, it can be distinguished whether the operation | movement state of the subunit | mobile_unit 10 at that time is a fire report state or an interlocking report state.

2.4 Summary In the present embodiment, the master unit 20 transmits a request signal as a transmission signal to the slave unit 10 and receives a response signal as a transmission signal from the slave unit 10. That is, the slave unit 10 and the master unit 20 can communicate transmission signals in both directions. However, the present invention is not limited to this. Communication of transmission signals may be possible only in one direction.

  For example, transmission signals may be communicated in one direction from the parent device 20 to the child device 10. At this time, when receiving the transmission signal, which is a data write command, for example, the slave unit 10 performs data write processing in the response time zone assigned to the own unit in the response interval. Thereby, the current consumed in the writing process is distributed. At this time, the transmission signal representing the transmission data is not transmitted in the notification detection section.

  Further, transmission signals may be communicated in one direction from slave unit 10 to master unit 20. In this case, the response section starts from the end point of the alert detection section. The subunit | mobile_unit 10 performs response operation | movement (for example, transmission of identification information), when the waiting time fixed with the identification information of an own machine passes. Thereby, the current consumed in the response operation is distributed.

  In addition, since the automatic fire alarm system A1 in the present embodiment can exchange various information between the parent device 20 and the child device 10 by using communication, the notification source of the child device 10 unit as described above is used. In addition to the identification information, various functions can be added.

  As described above, it is preferable that the communication unit 14 of the child device 10 of the automatic fire alarm system A1 in the present embodiment operates as follows. The communication unit 14 uses the power supplied from the parent device 20 in a communication section different from the alarm detection section having the total time length of the operation time zone assigned to each of the own device and the other child devices 10. Communication with the base unit 20 is performed.

  According to this structure, the subunit | mobile_unit 10 is communicating with the main | base station 20 in the communication area different from the alert detection area which has the operation time zone to which the own machine was allocated. Therefore, the subunit | mobile_unit 10 can communicate separately from a fire report and a link report. For example, when the slave unit 10 transmits transmission data to the master unit 20 in the communication section, the master unit 20 does not misrecognize the received transmission data as a fire report or a linked report.

  Here, it is preferable that the communication unit 14 starts communication when a time determined based on the identification information has elapsed after the start of the communication section.

  According to this configuration, the slave unit 10 starts communication when a time determined based on the identification information of the own unit has elapsed. Therefore, the automatic fire alarm system A1 using the slave unit 10 uses the current consumption used for communication. Can be dispersed.

3. Embodiment 3
The automatic fire alarm system A1 in the present embodiment will be described focusing on differences from the first and second embodiments. The basic configuration of the automatic fire alarm system A1 of the present embodiment is the same as that of the second embodiment, and the same components as those of the second embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  The automatic fire alarm system A1 of the present embodiment is different from the second embodiment in that the synchronization signal also serves as a request signal.

3.1 Configuration First, the transmission unit 24 of the parent device 20 of the present embodiment will be described.

  The transmission unit 24 periodically transmits the synchronization signal to the plurality of slave units 10 as in the first embodiment.

  Next, the subunit | mobile_unit 10 of this embodiment is demonstrated.

  The receiving circuit 16 of the child device 10 periodically receives the synchronization signal from the parent device 20.

  When the synchronization signal is received by the reception circuit 16, the processing unit 19 of the child device 10 transmits the transmission signal from the transmission circuit 15 in the response time zone assigned according to the identification information of the own device in the response section. . When the synchronization signal is received by the reception circuit 16, the processing unit 19 transmits the detection result from the transmission circuit 15 in the operation time zone assigned according to the identification information of the own device in the notification detection period.

3.2 Operation Hereinafter, the operation of the automatic fire alarm system A1 according to the present embodiment will be described with reference to FIG. FIG. 10 is a flowchart showing the operation of the child device 10.

  The processing unit 19 of the child device 10 determines whether or not the receiving circuit 16 has received the synchronization signal transmitted from the parent device 20 (step S200).

  When determining that it has been received (“Yes” in step S200), the processing unit 19 determines whether or not a response time zone corresponding to the identification information of the own device has arrived (step S205).

  When determining that the response time zone has arrived (“Yes” in step S205), the processing unit 19 transmits a response signal from the transmission circuit 15 by raising the current value of the drawn current (step S210).

  Thereafter, the processing unit 19 determines whether or not an operation time zone corresponding to the identification information of the own device has arrived (step S215).

  When determining that the operating time zone has arrived (“Yes” in step S215), the processing unit 19 performs a fire detection process (step S220). Here, since the fire detection process is the same as the process after step S15 in the process shown in FIG. 4, detailed description thereof is omitted here. In the fire detection process, the processing unit 19 of the slave unit 10 returns to step S200 when the operation time zone assigned to the slave unit 10 ends.

3.3 Specific Example In the present embodiment, as shown in FIG. 11A, the entire period from when the request signal and the synchronization signal are transmitted to when all the slave units 10 operate is as follows: It consists of a response interval Tb2 and a notification detection interval Ta2. Since the configuration of the response section Tb is the same as that of the second embodiment, and the configuration of the notification detection section Ta2 is the same as that of the first embodiment, description thereof is omitted here.

  FIG. 11B is a diagram for explaining the transition of the response operation and the fire detection operation.

  When a synchronization signal is received from the parent device 20 in the transmission section Ta1, the child device B1 performs a response operation in the response time zone TT1, and the child device B2 performs a response operation in the response time zone TT2. Thereafter, in each response time zone, the slave unit 10 to which the response time zone is assigned sequentially performs a response operation, and the slave unit B 64 performs a response operation in the last response time zone TT64.

  After the end of the response section Tb2, the alarm detection section Ta2 is started, and the slave unit B1 performs a fire detection operation in the operation time period T1, and the slave unit B2 performs a fire detection operation in the operation time period T2. Thereafter, in each operation time zone, the handset 10 to which the operation time zone is assigned sequentially performs the fire detection operation, and in the last operation time zone T64, the handset B64 performs the fire detection operation. According to this, when each slave unit 10 receives the synchronization signal, it can be seen that each of the response intervals Tb2 and the alert detection interval Ta2 starts at different times.

  Note that the change in current that one slave unit 10 draws in the response time zone and the operation time zone assigned to itself is the same as in the second embodiment (see FIG. 9), and thus the description thereof is omitted here. To do.

  In the present embodiment, as an example, the total time length of the synchronization signal transmission section Ta1, the response section Tb2, and the notification detection section Ta2 is assumed to be about 1 second. Then, when the total number of slave units 10 is 64, each of the operation time zone and the response time zone assigned to each slave unit 10 is assumed to be about 7 milliseconds.

  However, these specific numerical values are not intended to limit the embodiment, and can be appropriately changed. For example, in the present embodiment, the current value of the drawn current is allowed to vary within a predetermined allowable range. If it is in each tolerance | permissible_range in the main | base station 20, it can be distinguished whether the operation | movement state of the subunit | mobile_unit 10 at that time is a fire report state or an interlocking report state.

3.4 Summary In the automatic fire alarm system A1 according to the present embodiment, the slave unit 10 performs the response operation and the fire detection operation in the order of the response operation and the fire detection operation. However, the present invention is not limited to this. The subunit | mobile_unit 10 may process in order of the operation | movement of a fire detection, and a response operation.

  As described above, when the communication unit 14 receives the synchronization signal, the processing unit 19 of the slave unit 10 of the automatic fire notification system A1 according to the present embodiment performs the fire detection operation and the response operation (communication). It is preferable to carry out.

  According to this structure, the subunit | mobile_unit 10 is performing the operation | movement of the fire detection in the communication in a communication area, and the alert detection area, triggered by reception of a synchronous signal. Therefore, it is possible to share the triggers for the communication in the communication section and the operation in the notification detection section. Moreover, in the main | base station 20, the circuit which transmits a signal can be implement | achieved at low cost compared with the case where the trigger of fire detection operation and communication is made separate. For example, when the slave 10 separates the fire detection operation and the communication trigger, as described in the second embodiment, the slave 10 transmits the request signal and the first transmission circuit that transmits the synchronization signal. And a second transmission circuit. However, by sharing the fire detection operation and the communication trigger, the master unit 20 may be provided with either the first transmission circuit or the second transmission circuit. Therefore, the cost of the base unit 20 is reduced.

4). Modifications While the present invention has been described based on the first to third embodiments, the present invention is not limited to the above-described embodiments. For example, the following modifications can be considered.

  (1) In each of the above-described embodiments, the alert detection section is time-divided by the number of slave units 10, but is not limited to this.

  The notification detection section may be time-divided into at least two sections (operation time zones). One or more cordless handsets 10 are assigned to each time-divided section. According to this, since not all the subunit | mobile_unit 10 is allocated in one area, the electric current consumed by the operation | movement of a fire detection is disperse | distributed.

  (2) In each of the embodiments described above, the determination unit 18 determines that the fire report state is detected when the sensor value exceeds the first threshold value, but is not limited thereto. The determination unit 18 may determine that there is a fire report state when a state where the read sensor value exceeds the first threshold value continues for a predetermined number of times (for example, three times).

  Similarly, in the determination of the interlocking report state, the determination unit 18 determines that the state of the interlocking report is in a state where the read sensor value exceeds the second threshold value for a predetermined number of times (for example, three times). Good.

  (3) In each of the above embodiments, the transmission of the fire report and the interlocking report is a method of transmitting a signal by a change in the drawn current, but is not limited to this.

  The transmission of the fire bulletin may be a system in which a signal is transmitted by changing the voltage.

  Further, when transmitting a transmission signal, a method of transmitting a signal by changing a voltage may be used.

  (4) In Embodiment 2 described above, the operating slave unit 10 does not transmit a transmission signal in the operating time period, but is not limited thereto.

  The slave 10 that is operating may transmit a transmission signal in the operating time zone even when a response section is provided.

  (5) You may combine the said embodiment and modification.

10 slave unit 14 communication unit 15 transmission circuit 16 reception circuit 17 storage unit 19 processing unit 20 master unit 21 application unit

Claims (5)

A slave unit of an automatic fire alarm system electrically connected to a pair of electric wires to which a voltage is applied,
A storage unit storing identification information unique to the device;
A communication unit that is a signal represented by a change in voltage applied to the pair of electric wires, and that receives a synchronization signal transmitted from the parent device in order to synchronize with another child device, and
When the synchronization signal is received by the communication unit, a fire detection operation is performed using the power supplied from the parent device in an operation time zone assigned according to the identification information stored in the storage unit. A processing unit to perform,
In the alarm detection section having the total time length of the operation time zone assigned to each of the own device and other slave units, the processing unit detects a fire in the operation time zone assigned according to the identification information. The communication unit transmits the result of the fire detection performed by the processing unit via the pair of electric wires,
A response that is different from the notification detection interval, has a total time length of response time zones assigned to the own device and other child devices, and responds to a request signal transmitted by the parent device of section, in response time zone allocated in accordance with the identification information, the communication unit is to transmit a transmission signal to the request signal to the base unit using the power supplied from the base unit A slave unit for an automatic fire alarm system. 2. The automatic fire alarm system according to claim 1, wherein the communication unit starts transmission of the transmission signal when a time determined based on the identification information has elapsed after the start of the response section. Cordless handset. The communication unit includes a transmission circuit that transmits a signal corresponding to the operation of the fire detection by changing a current drawn from the pair of wires.
The transmission circuit transmits a fire report signal for notifying the occurrence of a fire by the operation of the fire detection, and an interlock report signal for interlocking with other devices,
The first current value of the current drawn from the pair of electric wires by the transmission circuit when transmitting the fire report signal, and the current drawn by the transmission circuit from the pair of electric wires when transmitting the interlocking signal It is different from a 2nd electric current value. The subunit | mobile_unit of the automatic fire alarm system of Claim 1 or Claim 2 characterized by the above-mentioned. The communication unit includes a transmission circuit that transmits a fire report signal that notifies the occurrence of a fire by changing the current drawn from the pair of electric wires in the fire detection operation,
2. The automatic fire notification system according to claim 1, wherein the transmission circuit further transmits an identification signal representing the identification information when a predetermined waiting time elapses after the fire report is transmitted. Child machine. The handset according to any one of claims 1 to 4,
An automatic fire alarm system comprising: a master unit that applies a voltage between the pair of electric wires.

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