JP2017084178A - Automatic fire alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic fire alarm system that makes possible generation of fire alarm by a slave machine to which no identification information is allocated.SOLUTION: An automatic fire alarm system 1 is equipped with a master machine 2 and a slave machine 3. The master machine 2 has a transmitting unit 24 for transmitting synchronizing signals to the slave machine 3. The slave machine 3 has a receiving circuit 35 for receiving synchronizing signals, a memory unit 37 for storing identification information and a transmitting circuit 34 for causing a fire alarm to be generated. An alarm issuing section starting in synchronism with a synchronizing signal contains multiple main time slots and standby time slots matching valid identification information in a 1-to-1 relationship. The transmitting circuit 34, if valid identification information is stored in the memory unit 37, causes the fire alarm to be generated in the main time slots matching the valid identification information stored in the memory unit 37. Or, if no valid identification information is stored in the memory unit 37, the transmitting circuit 34 causes the fire alarm to be generated in the standby time slots.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic fire alarm system.

  Conventionally, there are two types of systems, P-type (Proprietary-type) and R-type (Record-type), as automatic fire alarm systems (self-fire alarm systems). Regardless of P-type or R-type, the automatic fire alarm system detects the occurrence of a fire with a slave unit consisting of a heat detector, smoke detector, flame detector, etc., and sends it to a master unit consisting of a receiver. It is configured to notify the fire from the slave unit.

  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 the R-type automatic fire system, a slave unit notifies the master unit of the occurrence of a fire through communication using a transmission signal transmitted through a transmission line. In general, an R-type automatic fire alarm system is used for large-scale buildings, and a P-type automatic fire alarm system is often used for buildings of medium-sized or smaller because of ease of construction.

  As a P-type automatic fire alarm system, there is disclosed a system having a configuration 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 (for example, Patent Documents). 1). In addition, as a P-type automatic fire alarm system, in order to prevent multiple slave units from simultaneously generating a fire report, identification information is assigned to each of the multiple slave units, and a slave unit fires for each identification information. There is also a system that distinguishes the time of day when information is generated.

JP 2002-8154 A

  If no identification information is assigned to the slave unit, the slave unit may not be able to generate a fire report.

  This invention is made | formed in view of the said reason, The objective is to provide the automatic fire alerting | reporting system in which the subunit | mobile_unit which is not assigned identification information can generate | occur | produce a fire alert.

  The automatic fire alarm system of the present invention includes a master unit that applies a voltage between a pair of electric wires, and a slave unit that is electrically connected to the pair of electric wires. A first transmission unit configured to transmit a synchronization signal represented by a voltage change to the slave unit; the slave unit stores a reception unit that receives the synchronization signal; and identification information assigned to the slave unit And a second transmission unit that generates a fire report represented by a voltage change between the pair of electric wires, and a reporting section that starts in synchronization with the synchronization signal includes a plurality of pieces of effective identification information. A plurality of primary time slots corresponding to one-to-one and spare time slots, and the second transmission unit stores any one of the plurality of valid identification information as the identification information in the storage unit The storage unit among the plurality of main time slots. When the fire information is generated in the main time slot corresponding to the effective identification information stored, and none of the plurality of effective identification information is stored in the storage unit, the fire information is transmitted in the spare time slot. It is characterized by generating.

  In the present invention, there is an effect that a slave unit to which valid identification information is not assigned can generate a fire report.

It is a block diagram showing a schematic structure of an automatic fire information system concerning an embodiment. It is a block diagram which shows the whole structure of the automatic fire alerting | reporting system which concerns on embodiment. It is a wave form diagram showing change of drawing current of an automatic fire information system concerning an embodiment. It is explanatory drawing of operation | movement of the automatic fire alarm system which concerns on embodiment. It is explanatory drawing of operation | movement of the 1st modification of the automatic fire alarm system which concerns on embodiment. It is a block diagram which shows the whole structure of the 2nd modification of the automatic fire alerting | reporting system which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 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.

(Embodiment)
FIG. 1 is a block diagram showing a schematic configuration of an automatic fire alarm system 1 according to the present embodiment.

  The automatic fire alarm system 1 of this embodiment includes a master unit 2 that applies a voltage between a pair of electric wires 51 and 52 and a slave unit 3 that is electrically connected to the pair of electric wires 51 and 52. The base unit 2 includes a transmission unit 24 (first transmission unit) that transmits a synchronization signal represented by a voltage change between the pair of electric wires 51 and 52 to the slave unit 3. The subunit | mobile_unit 3 is based on the voltage change between the voltage between the receiving circuit 35 (receiving part) which receives a synchronizing signal, the memory | storage part 37 which memorize | stores the identification information allocated to the subunit | mobile_unit 3, and a pair of electric wires 51 and 52. And a transmission circuit 34 (second transmission unit) that generates a fire report. The reporting period that starts in synchronization with the synchronization signal includes a plurality of valid identification information, a plurality of main time slots corresponding one-to-one, and a spare time slot. When any of the plurality of pieces of valid identification information is stored in the storage unit 37 as the identification information, the transmission circuit 34 stores the main time corresponding to the valid identification information stored in the storage unit 37 among the plurality of main time slots. Generate a fire report in the slot. Further, when none of the plurality of valid identification information is stored in the storage unit 37, the transmission circuit 34 generates a fire report in the spare time slot.

  With the above configuration, the slave unit 3 to which no valid identification information is assigned can generate a fire report by using the spare time slot assigned to the notification section.

  Below, the automatic fire alarm system 1 which concerns on this embodiment is demonstrated in detail.

<Overall configuration>
In this embodiment, although the case where the automatic fire alarm system 1 is used for the apartment house (apartment) 7 (see FIG. 2) is illustrated, the automatic fire alarm system 1 is not limited to the apartment house 7, for example, a commercial facility or a hospital It can be applied to various buildings such as hotels and multi-tenant buildings.

  In the automatic fire alarm system 1 of the present embodiment, as shown in FIG. 2, one master unit 2 and a plurality of slave units 301, 302, 303,... It has been. When each of the plurality of slave units 301, 302, 303... Is not particularly distinguished, it is simply referred to as “slave unit 3”.

  Furthermore, in this automatic fire alarm system 1, a pair of electric wires 51 and 52 are wired for every floor (floor) of 1-4 floors. In short, four sets of two sets of wires (two-wire type) are provided in the entire housing complex 7.

  Here, a maximum of 40 to 80 slave units 3 can be connected to each set of wires. 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 2. Therefore, for example, when a maximum of 40 cordless handsets 3 can be connected to each set of wires, and a maximum of 50 pairs of wires 51 and 52 can be connected to one master phone 2, the cordless handset 3 is: A maximum of 2000 (= 40 × 50) units can be connected to one base unit 2. However, these numerical values are examples, and are not intended to be limited to these numerical values.

  Further, the pair of electric wires 51 and 52 are electrically connected via the terminal resistor 6 at the terminal ends (ends opposite to the base unit 2). Therefore, the main | base station 2 can detect the disconnection of a pair of electric wires 51 and 52 by monitoring the electric current which flows between a pair of electric wires 51 and 52. FIG. However, the termination resistor 6 is not an essential configuration and may be omitted.

  The automatic fire notification system 1 basically detects the occurrence of a fire in a slave unit 3 including a heat detector, a smoke detector, a flame detector, and the like, and transfers from the slave unit 3 to a master unit 2 as a receiver. It is configured to notify the occurrence of a fire (fire report). However, the subunit | mobile_unit 3 may contain not only the sensor which detects generation | occurrence | production of a fire but a transmitter. The transmitter is a device that has a push button switch and, when a person finds a fire, manually operates the push button switch to notify the parent device 2 of the occurrence of a fire (fire report).

  The automatic fire alarm system 1 of this embodiment is based on a P-type automatic fire alarm system. More specifically, in the present embodiment, in the housing complex 7 where the P-type automatic fire alarm system was installed, the existing wiring (the pair of electric wires 51 and 52) is used as it is, and the receiver (parent device). Assume that the slave unit is replaced. Note that the automatic fire notification system 1 of the present embodiment can also be employed as a newly introduced automatic fire notification system.

  And the automatic fire alarm system 1 of this embodiment is comprised so that communication between the main | base station 2 and the subunit | mobile_unit 3 is possible by the signal represented by the voltage change between a pair of electric wires 51 and 52. FIG. . In the present embodiment, time-division communication is adopted as a communication method between the parent device 2 and the plurality of child devices 3, and each of the plurality of child devices 3 has its own device (child device 3). A signal is transmitted to base unit 2 in a time slot (time zone) corresponding to. That is, the automatic fire alarm system 1 of the present embodiment is partly added with the same function as the R type although it is the P type.

<Example configuration of main unit>
The base unit 2 of the present embodiment is a P-type receiver that receives a fire occurrence notification (fire report) from the handset 3. Base unit 2 is installed in a management room of a building (apartment house 7).

  As shown in FIG. 1, the main unit 2 includes an application unit 21, a resistor 22, a reception unit 23, a transmission unit 24, a display unit 25 that performs various displays, an operation unit 26 that receives operation inputs, And a processing unit 27 having a function of controlling each unit (reception unit 23, transmission unit 24, display unit 25).

  The application unit 21 constantly applies a predetermined voltage to the pair of electric wires 51 and 52. 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.

  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 electrically connected between one of the pair of electric wires 51 and 52 (high potential side) electric wire 51 and the application unit 21. However, not limited to this example, the resistor 22 may be electrically connected between the other (low potential side) electric wire 52 and the application unit 21, or may be applied to both the pair of electric wires 51 and 52. They may be electrically connected to each other.

  The resistor 22 has a first function of converting a current flowing through the resistor 22 into a potential difference (voltage) between both ends of the resistor 22 by a voltage drop, and a pair of wires 51 when the pair of wires 51 and 52 are short-circuited. , 52 has a second function of limiting the current flowing through the first and second currents. 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 both electrically connected between the resistor 22 and the pair of electric wires 51 and 52.

  The receiving unit 23 receives the current signal from the child device 3 as a voltage signal (voltage change) on the pair of electric wires 51 and 52. That is, the current value of the current drawn from the pair of electric wires 51 and 52 by the handset 3 (drawing current) corresponds to the magnitude of the voltage drop at the resistor 22, so that the receiving unit 23 A fire report represented by a current value can be received as a voltage signal. When the master unit 2 receives the fire report, the display unit 25 displays the location where the fire has occurred.

  The transmission unit 24 (first transmission unit) transmits a current signal generated on the pair of electric wires 51 and 52 to the slave unit 3 by changing the current flowing from the pair of electric wires 51 and 52. A change in current (current signal) flowing through the pair of electric wires 51 and 52 generated by the transmission unit 24 is converted into a voltage signal by a voltage drop at the resistor 22. That is, the voltage change generated on the pair of electric wires 51 and 52 when the transmitting unit 24 changes the current flowing from the pair of electric wires 51 and 52 is received by the slave unit 3 as a voltage signal. In the present embodiment, the transmission unit 24 transmits a synchronization signal and a request signal as current signals to the slave unit 3. The request signal is a signal for requesting a response from the slave unit 3, for example, a survival confirmation (keep alive) signal.

  The processing unit 27 has a microcomputer (microcomputer) as a main configuration, and realizes a desired function by executing a program stored in a memory. The program may be written in the memory in advance, but may be provided by being stored in a recording medium such as a memory card, or may be provided through an electric communication line.

  Moreover, the main | base station 2 uses the commercial power source, private power generation equipment, etc. which are not illustrated as a main power source. As described above, the master unit 2 includes the slave unit 3 connected to the pair of electric wires 51 and 52 by applying a voltage from the applying unit 21 to the pair of electric wires 51 and 52, and thus the automatic fire notification system 1. Functions as a power supply for the entire operation.

  Furthermore, the base unit 2 further includes a standby power source 28 using a storage battery so that a power source for operation of the automatic fire alarm system 1 can be secured even in the event of a power failure. The application unit 21 automatically switches the power supply source from the main power source to the standby power source 28 when the main power source is interrupted, and automatically switches from the standby power source 28 to the main power source when the main power source is restored. The standby power supply 28 has a capacity and other specifications determined so as to satisfy the standards defined by the ministerial ordinance.

<Example configuration of slave unit>
As shown in FIG. 1, the slave unit 3 of the present embodiment includes a diode bridge 31, a power supply circuit 32, a sensor 33, a transmission circuit 34 (second transmission unit), a reception circuit 35 (reception unit), A processing unit 36, a storage unit 37, and a determination unit 38 are included.

  In the diode bridge 31, a pair of electric wires 51 and 52 are electrically connected to the input end side, and a power supply circuit 32, a transmission circuit 34, and a reception circuit 35 are electrically connected to the output end side.

  The power supply circuit 32 generates power for operation of the slave unit 3 from the power supplied from the master unit 2 via the pair of electric wires 51 and 52.

  The sensor 33 detects the occurrence of fire or smoke.

  The transmission circuit 34 is configured to transmit the current value of the current drawn from the pair of electric wires 51 and 52 to the parent device 2 as a current signal. A change in current (current signal) flowing in the pair of electric wires 51 and 52 generated by the transmission circuit 34 is converted into a voltage signal by a voltage drop at the resistor 22. That is, by adjusting the current value of the drawing current drawn from the pair of electric wires 51 and 52 by the transmission circuit 34, a voltage signal corresponding to the drawing current value is received by the parent device 2. The transmission circuit 34 of the present embodiment is configured such that the current value of the drawn current can be switched in three stages.

  The receiving circuit 35 receives a current signal (synchronization signal, request signal) from the parent device 2 as a voltage change (voltage signal) generated between the pair of electric wires 51 and 52. That is, a change in current (current signal) flowing through the pair of electric wires 51 and 52 generated by the master unit 2 is converted into a voltage signal by a voltage drop at the resistor 22. A current signal (synchronization signal, request signal) is received as a voltage signal. In other words, the receiving circuit 35 receives, as a voltage signal, a voltage change that occurs between the pair of electric wires 51 and 52 when the parent device 2 changes the current flowing from the pair of electric wires 51 and 52.

  The memory | storage part 37 has memorize | stored the address allocated to the subunit | mobile_unit 3 as identification information. Specifically, the handset 3 of the present embodiment includes a setting unit 39 that stores an address in the storage unit 37. The setting unit 39 is configured to be able to communicate with the address setting device 4 by a communication means such as wired communication via a removable cable or wireless communication. The address setting unit 4 receives an address assigned to the child device 3 by an operation input from the user, and transmits the input address to the setting unit 39. The setting unit 39 stores the address transmitted from the address setting unit 4 in the storage unit 37 as identification information.

  As for the subunit | mobile_unit 3 of this embodiment, the predetermined address initial value is previously memorize | stored in the memory | storage part 37 at the time of factory shipment. The user assigns a unique address to each of the plurality of slave units 3 so that the addresses do not overlap among the plurality of slave units 3. That is, the user rewrites the address stored in the storage unit 37 from the initial address value to a unique address. The unique address assigned to the child device 3 is registered in the parent device 2 in association with the installation location (for example, the room number) of the child device 3.

  Further, the storage unit 37 stores determination conditions for the determination unit 38 to determine the operation state of the child device 3. The determination condition is, for example, a threshold set for the output of the sensor 33 or the like. Note that the address (identification information) assigned to the child device 3 and the determination condition may be stored in the same storage unit 37, or a plurality of storage units 37 may be provided and stored in separate storage units 37, respectively. May be.

  The determination unit 38 determines whether the operation state of the slave unit 3 is a fire report state that generates a fire report or a non-report state (a normal state) that does not generate a fire report. Specifically, the determination unit 38 reads the output (sensor value) of the sensor 33 and determines the operation state by referring to the determination conditions stored in the storage unit 37. For example, the determination unit 38 determines that the fire report state is present when the read sensor value exceeds a threshold value.

  The processing unit 36 controls the transmission circuit 34 and the reception circuit 35 to cause the transmission circuit 34 to transmit a current signal, or cause the reception circuit 35 to receive a current signal (synchronization signal, request signal) from the parent device 2. To do. The processing unit 36 has a microcomputer (microcomputer) as a main component, and implements a desired function by executing a program stored in a memory. The program may be written in the memory in advance, but may be provided by being stored in a recording medium such as a memory card, or may be provided through an electric communication line.

  The processing unit 36 causes the transmission circuit 34 to transmit a current signal by adjusting the current value of the drawn current according to the determination result of the determination unit 38. The change in the current value of the drawn current will be specifically described with reference to FIG. FIG. 3 represents a change in the current value of the current flowing through the pair of electric wires 51 and 52 with the horizontal axis representing time and the vertical axis representing the current value. In the example of FIG. 3, the current value of the current flowing through the pair of electric wires 51 and 52 can be increased stepwise in three stages from I0 to I1, I2, and I3 by the transmission circuit 34 switching the current value of the drawn current. (I0 <I1 <I2 <I3). Here, the current value “I0” is a current flowing through the pair of electric wires 51 and 52 in the 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. 3, it is a non-reporting state during the period from time t0 to t3. Further, during the period from time t1 to time t2, the transmission circuit 34 transmits a transmission signal representing transmission data (for example, an address assigned to the slave unit 3) as a current signal, and flows through the pair of electric wires 51 and 52. The current value of the current increases or decreases between “I0” and “I1”.

  Moreover, in the example of FIG. 3, it is a fire report state in the period of the time t3-t6. When the determination result of the determination unit 38 is in the fire report state, as shown in FIG. 3, the current value of the current flowing through the pair of electric wires 51 and 52 increases from “I0” to “I2”. In the period from time t4 to t5, the transmission circuit 34 transmits a transmission signal representing transmission data as a current signal, and the current value of the current flowing through the pair of electric wires 51 and 52 is “I2” and [I3. ”.

  In this way, the processing unit 36 adjusts the current value of the drawn current to a predetermined fire reporting level when the determining unit 38 determines that the state is a fire reporting state. That is, the transmission unit 24 changes the current value of the drawn current from “I0” to “I2”, thereby generating a fire report. Further, the processing unit 36 sets the current value of the pull-in current between two values (between the current values “I0” and “I1” or the current value “I2” in both the fire report state and the non-report state). ”And“ I3 ”), the transmission signal is transmitted from the transmission circuit 34. When the slave unit 3 is in the fire report state, the master unit 2 transmits the transmission signal indicating the transmission data including the address (identification information) stored in the storage unit 37, so that the master unit 2 The slave unit 3 can be specified.

  In addition, the automatic fire alarm system 1 performs communication using a transmission signal between the master unit 2 and the slave unit 3 at the time of non-reporting (normal time), so that the communication status between the master unit 2 and the slave unit 3 An automatic test can be performed on the operation of the slave unit 3.

  The transmission circuit 34 may be configured by a constant voltage circuit (step-down circuit) that generates a fire report and transmits a transmission signal by stepping down the voltage between the pair of electric wires 51 and 52.

<Operation>
Hereinafter, operation | movement of the automatic fire alarm system 1 which concerns on this embodiment is demonstrated using FIG. Here, it is assumed that the number of slave units 3 is a total of 64 slave units 301, 302, 303,. Addresses “1” to “64” are valid addresses (valid identification information), and addresses other than addresses “1” to “64” (including address “0” which is an initial address value) are invalid addresses. A valid address is an address associated with one of a plurality of time-divided time slots, and an invalid address is an address not associated with any of a plurality of time-divided time slots. A total of 63 slave units 301, 302, 304,..., 364 excluding the slave unit 303 are assigned unique effective addresses “1”, “2”, “4”. Suppose that On the other hand, the child device 303 should originally be assigned the address “3” which is an effective address, but the address is not set by the user, and the address stored in the storage unit 37 is the address “0” which is the initial address value. It is assumed that “(invalid address)” remains. That is, in the handset 303, none of the plurality of effective addresses is stored in the storage unit 37. The state in which none of the plurality of effective addresses is stored in the storage unit 37 is not limited to the state in which the address “0” that is the initial address value is stored in the storage unit 37 as described above. . For example, a state in which an address other than the effective addresses “1” to “64” (for example, address “65”) is stored in the storage unit 37 or a state in which the address itself is not stored in the storage unit 37 is included.

  In FIG. 4, Ta is a section (synchronization section) in which a synchronization signal is transmitted, Tb is a section (request section) in which a request signal is transmitted, and Tc is a guard section. In FIG. 4, Td is a section (transmission section) in which a transmission signal is transmitted, Te is a stabilization waiting period, and Tf is a section (reporting section) for issuing a fire report.

  In the automatic fire alarm system 1 of the present embodiment, a time division method is adopted as a communication method between the parent device 2 and the plurality of child devices 3. Base unit 2 periodically transmits a synchronization signal, and in synchronization with this synchronization signal, the start timing of request period Tb, transmission period Td, reporting period Tf, etc. following synchronization period Ta is determined. Each slave unit 3 receives the synchronization signal in the synchronization section Ta, and the timing at which the own unit transmits the current signal is determined in synchronization with the synchronization signal.

  In the request section Tb, the parent device 2 transmits a request signal to each child device 3. Each slave unit 3 transmits a transmission signal representing transmission data (for example, an address assigned to the own device) in the transmission section Td. Specifically, the transmission section Td is time-divided in the order of time slots Td1 to Td64, and each of the time slots Td1 to Td64 has a one-to-one correspondence with the addresses “1” to “64” which are effective addresses. It has been.

  Each slave unit 3 transmits a transmission signal in a time slot corresponding to the address stored in the storage unit 37. Therefore, in the transmission section Td, the slave unit 301 to which the address “1” is assigned in the time slot Td1 transmits a transmission signal representing transmission data including the address stored in the storage unit 37, for example. The slave unit 302 to which the address “2” is assigned in the next time slot Td2 transmits a transmission signal.

  As described above, the address is not set by the user here, and there is no slave 3 in which the address “3” corresponding to the time slot Td3 is set. Therefore, in time slot Td3, none of the plurality of slave units 301 to 364 transmits a transmission signal. In the subsequent time slots Td4 to Td64, the slave units 304 to 364 to which the corresponding addresses are assigned sequentially transmit transmission signals.

  In this way, in the transmission section Td, each slave unit 3 transmits a transmission signal in a time slot corresponding to the valid address assigned to the own unit when a valid address is assigned, and waits in other time slots. It becomes a state. Further, the slave unit 303 to which no effective address is assigned is in a standby state during the transmission period Td. Master unit 2 does not receive the transmission signal including address “3” in the transmission data in transmission period Td, and therefore specifies that address “3” is not set and displays it on display unit 25. .

  Next, in the notification section Tf, each handset 3 performs a fire detection operation, and generates a fire report when the determination unit 38 determines that the fire report state is present. Specifically, the reporting period Tf is time-divided into main time slots Tf1 to Tf64 and one spare time slot Tf0. Each of the main time slots Tf1 to Tf64 is associated with addresses “1” to “64” which are effective addresses in a one-to-one correspondence.

  Each cordless handset 3 performs a fire detection operation in a time slot corresponding to the address stored in the storage unit 37. Therefore, in the reporting period Tf, the handset 301 assigned the address “1” in the main time slot Tf1 performs a fire detection operation. Specifically, in the main time slot Tf1, the slave unit 301 reads the output (sensor value) of the sensor 33 by the determination unit 38 and determines whether it is a fire report state or a non-report state. And the subunit | mobile_unit 301 maintains the electric current value of drawing current in "I0", when the judgment result of the judgment part 38 is a non-reporting state. Further, when the determination result of the determination unit 38 is the fire report state, the slave unit 301 increases the current value of the drawn current from “I0” to “I2” and generates a fire report. At this time, the slave unit 301 increases or decreases the current value of the drawn current between “I2” and “I3” and transmits a transmission signal indicating the address “1”, so that the fire report source is the child The master unit 2 is notified that it is a machine 301. Note that the determination process by the determination unit 38 reading the sensor value to determine whether the state is a fire report state or a non-report state may be performed in advance before the main time slot Tf1. In the next main time slot Tf2, the slave unit 302 to which the address “2” is assigned performs a fire detection operation.

  As described above, the address is not set by the user here, and there is no slave 3 in which the address “3” corresponding to the main time slot Tf3 is set. Therefore, in the main time slot Tf3, none of the plurality of slave units 301 to 364 performs the fire notification operation. In the main time slots Tf4 to Tf64, the slave units 304 to 364 to which the corresponding addresses are assigned sequentially perform the fire detection operation.

  As shown in FIG. 4, the reporting period Tf of this embodiment is time-divided into a total of 65 time slots including main time slots Tf1 to Tf64 and spare time slot Tf0. A spare time slot Tf0 is assigned later. This spare time slot Tf0 is a time zone provided for the child device 3 to which no effective address is assigned to perform a fire detection operation and generate a fire report. As described above, the address is not set by the user here, and the address “0” (address initial value), which is an invalid address, is stored in the storage unit 37 of the slave unit 303. In other words, None of the effective addresses are stored. Accordingly, the slave unit 303 performs a fire detection operation in the spare time slot Tf0, and generates a fire report when the determination result of the determination unit 38 is a fire report state.

<Effect>
As described above, the automatic fire alarm system 1 according to the present embodiment has a time period in which the slave unit 3 to which the effective address is not assigned can perform a fire detection operation and generate a fire alarm in the notification period Tf (preliminary time). Time slot Tf0) is allocated. Thereby, for example, even if there is a slave unit 3 in which no address is set by the user and a valid address is not assigned, the slave unit 3 can generate a fire report in the spare time slot Tf0. It is possible to suppress the misreporting of fire reports.

  Further, when there is an effective address that is not included in the transmission data of the received transmission signal in the transmission section Td, the base unit 2 can specify (detect) that this effective address is not set. As a result, the parent device 2 can detect the presence / absence of the child device 3 to which no effective address is assigned.

  That is, in the automatic fire alarm system 1 of the present embodiment, it is possible to detect the presence / absence of the slave unit 3 to which no effective address is assigned, and the slave unit 3 generates a fire report regardless of whether or not an effective address is assigned. Is possible.

  In the present embodiment, the time position of the spare time slot Tf0 in the reporting period Tf is set to the time after the main time slots Tf1 to Tf64, but is not limited to this time position. For example, the time position of the spare time slot Tf0 may be set to a time before the main time slots Tf1 to Tf64 or a time in the middle of the main time slots Tf1 to Tf64.

  Further, in the example shown in FIG. 4, one reporting period Tf is generated in synchronization with one synchronization signal, but the reporting period Tf is continued a plurality of times in synchronization with one synchronization signal. It may be configured to be generated. In other words, it may be configured such that the synchronization signal is generated after the reporting section Tf is repeatedly generated a plurality of times.

  Also in the transmission section Td, the slave unit 3 to which no effective address is assigned can transmit a transmission signal representing transmission data including the address stored in the storage unit 37 (preliminary time slot). ) May be assigned. Thereby, the main | base station 2 can acquire the information of the address (a valid address and an invalid address are included) assigned to each of the plurality of sub-units 3. Then, the master unit 2 can display on the display unit 25 that there is a slave unit 3 to which an invalid address is assigned.

<First Modification>
Next, a first modification of the automatic fire notification system 1 will be described with reference to FIG. In the automatic fire alarm system 1 of this modification, the preliminary time slot Tf0 is also used as any one of the plurality of main time slots Tf1 to Tf64 in the alarm period Tf. Other configurations are the same as those of the above-described embodiment, and the same reference numerals are given and description thereof is omitted.

  In the example shown in FIG. 5, the spare time slot Tf0 is also used as the main time slot Tf1. In other words, the spare time slot Tf0 is assigned to the same time position as the main time slot Tf1. That is, in this modification, the reporting period Tf is time-divided into a total of 64 time zones from the main time slot Tf1 (preliminary time slot Tf0) to the main time slot Tf64.

  In this modification, the slave unit 303 to which no valid address is assigned performs a fire detection operation in the main time slot Tf1 (preliminary time slot Tf0), and the determination result of the determination unit 38 is the fire report state. Fire alarm.

  Here, the spare time slot Tf0 is a time slot allocated so that a slave unit 3 to which a valid address that should be originally allocated due to an address not set by the user or the like is not allocated can generate a fire report. . Therefore, when valid addresses are assigned to all the slave units 3, the spare time slot Tf0 is not necessary.

  In this modification, the spare time slot Tf0 is also used as the main time slot Tf1. In other words, when effective addresses are assigned to all the slave units 3, there is no time zone dedicated to the spare time slot Tf0 that becomes unnecessary. Thereby, the time length of the alerting | reporting area Tf can be shortened, and it becomes possible to shorten the time interval which each subunit | mobile_unit 3 performs operation | movement of a fire detection. Note that the spare time slot Tf0 may be shared with any one of the main time slots Tf2 to Tf64 other than the main time slot Tf1.

<Second Modification>
Next, a second modification of the automatic fire notification system 1 will be described with reference to FIG. The master unit 2 of the automatic fire notification system 1A of the present modified example specifies the slave unit 3 that has generated the fire report depending on which of the main time slots Tf1 to Tf64 the fire report has occurred. A portion 271 is further provided. Other configurations are the same as those of the above-described embodiment, and the same reference numerals are given and description thereof is omitted.

  The identification unit 271 is configured integrally with the processing unit 27 and identifies the child device 3 that is the source of the fire report. Specifically, the identification unit 271 starts timing in synchronization with the synchronization signal and stops receiving the fire report when the receiving unit 23 receives the fire report. Detect the main time slot that occurred. Then, the specifying unit 271 specifies that the handset 3 to which the address corresponding to the detected main time slot is assigned is the fire report issue source. For example, assume that the handset 301 generates a fire report in the main time slot Tf1. The identification unit 271 detects the main time slot Tf1 in which the fire report has occurred in the report section Tf, so that the slave unit 301 to which the address “1” corresponding to the main time slot Tf1 is assigned is assigned to the fire report issue source. Is identified. Thereby, the subunit | mobile_unit 3 does not need to transmit the transmission signal showing the transmission data containing the address memorize | stored in the memory | storage part 37 at the time of fire report generation | occurrence | production. Therefore, since the time length of the main time slot can be shortened, it is possible to shorten the time interval at which each slave unit 3 performs the fire detection operation. The specifying unit 271 may be configured separately from the processing unit 27.

1,1A Automatic fire alarm system 2 Master unit 24 Transmitter (first transmitter)
271 Identification unit 3 Slave unit 34 Transmission circuit (second transmission unit)
35 Receiver circuit (receiver)
37 Storage Units 51, 52 Electric Wire Tf Reporting Sections Tf1 to Tf64 Main Time Slot Tf0 Spare Time Slot

Claims (3)

A master unit that applies a voltage between a pair of wires;
A handset electrically connected to the pair of electric wires,
The base unit is
A first transmission unit that transmits a synchronization signal represented by a voltage change between the pair of wires to the slave unit;
The slave is
A receiver for receiving the synchronization signal;
A storage unit for storing identification information assigned to the slave unit;
A second transmitter that generates a fire report represented by a voltage change between the pair of wires,
The reporting period starting in synchronization with the synchronization signal includes a plurality of effective identification information, a plurality of main time slots corresponding one-to-one, and a spare time slot,
When any of the plurality of pieces of valid identification information is stored as the identification information in the storage unit, the second transmission unit stores valid identification information stored in the storage unit among the plurality of main time slots. The fire report is generated in a main time slot corresponding to the above, and when none of the plurality of valid identification information is stored in the storage unit, the fire report is generated in the spare time slot. Automatic fire alarm system. The automatic fire alarm system according to claim 1, wherein the spare time slot is also used as any one of the plurality of main time slots. The master unit further includes a specifying unit that specifies the slave unit that has generated the fire report depending on which main time slot of the plurality of main time slots has generated the fire report. Item 3. An automatic fire alarm system according to item 1 or 2.

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