JP2005352918A - Fire alarm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify a fire detector that is connected to the same detector line and has issued a second alarm or later. <P>SOLUTION: In a P-type fire alarm system, a plurality of fire detectors are connected to a detector line pulled out of a receiver. A first-alarm processing section of the fire detector, when it detects a fire and issues the first alarm of the same detector line, transmits a bit string following a common fire signal, and transmits an address bit signal in the rank of the bit string corresponding to its own address. A second-alarm processing section of the fire detector, when it detects the fire and issues the second alarm of the same detector line, transmits the address bit signal in the rank corresponding to its own address in the bit string transmitted by a first-alarm processing section of the other fire detector. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a fire alarm system in which a plurality of fire detectors are connected to a sensor line drawn from a receiver, and fire alarms are received and alarmed on a line basis.

  Conventionally, in the fire alarm system known as P type, a plurality of fire detectors are connected to the sensor line drawn from the receiver, and the alarm signal from the fire detector is received for each line. The fire is alarmed.

  On the other hand, in the fire alarm system known as the R type, a terminal device such as a repeater or an analog fire detector having a transmission function is connected to the transmission line drawn from the receiver, and when a fire is detected, for example, Based on the fire interrupt from the terminal device, issue the search command to identify the address of the terminal device that was issued, display the fire occurrence address, and collect and monitor the fire data from the identified terminal device Yes.

  Knowing the address of the fire detector or repeater that detected the fire in this way makes it possible to conduct appropriate evacuation guidance and extinguishment activities, and is an indispensable function especially for fire monitoring of large-scale facilities.

  However, in the P-type fire alarm system, the receiver knows which sensor line has fired, but which sensor out of the multiple sensors connected to the alarm line that has fired has fired. I don't know if I reported it.

  Therefore, in recent years, the P-type fire alarm system has also made it possible to identify the fire detector that has issued the alarm by sending an address signal from the fire detector that has issued the alarm. FIG. 7 is a time chart of a detector line voltage and a fire detector switching circuit when a fire is triggered in a conventional P-type fire alarm system.

  Among fire detectors connected to the same sensor line, for example, if a fire detector set at address 2 detects a fire at time t1, it is provided in the fire detector that has issued the alarm. When the switching circuit is turned on, a common alarm signal as a fire signal is caused to flow through the sensor line, so that the voltage of the sensor line in FIG. 7A is reduced from 24 V to 10 V, for example, during monitoring. Subsequently, the fire detector that has issued the alarm transmits an address signal by switching and operation indicating address 2, whereby the detector line voltage changes between 10V and 24V.

In the receiver, a common fire signal transmitted from the fire detector at address 2 that fired at time t1, that is, the alarm current that flows from the receiver to the fire detector is received and alarmed. To identify the fire detector address issued from the address signal received following the common fire signal, and to display the necessary information such as the area where the fire occurred.
JP 2001-184571 A

  However, in such a P-type fire alarm system in which an address signal is sent in addition to a common fire signal from the conventional fire alarms, the first fire that was first fired Although it is possible to specify a sensor, the second and subsequent reports issued by other fire detectors connected to the same sensor line cannot be used to specify a fire detector. is there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a P-type fire alarm system that can identify fire detectors that are issued after the second report connected to the same sensor line.

  In order to achieve this object, the present invention is configured as follows. The present invention relates to a fire alarm system in which a plurality of fire detectors are connected to a sensor line drawn from a receiver. The fire detector detects a fire and issues a first report of the same sensor line. In this case, the first report processing unit transmits the bit string following the common fire signal and transmits the address bit signal in the order of the bit string corresponding to its own address, and 2 of the same sensor line by detecting the fire. A second report processing unit that transmits an address bit signal in the order corresponding to its own address of the bit string transmitted by the first report processing unit of another fire detector when the report is issued; The receiver is provided with a reception control unit that receives a common fire signal and gives an alarm, and identifies a sensor address issued from the order in which the address bit signal is received in the bit string.

Here, the first report processing unit of the fire detector transmits a bit string of the maximum number of fire detectors that can be connected to the sensing line following the common fire signal. The second report processing unit of the fire detector prohibits transmission of a common fire signal for the second fire report on the same sensor line. Further, the fire detector repeatedly transmits a bit string and an address bit signal.

  According to the present invention, when the fire detector is the first fire alarm, the bit string is transmitted following the common fire signal, and the address bit signal is sent in the order corresponding to the self address of this bit string. The fire detector that sent the second report on the same sensor line sends the address bit signal in the order corresponding to the address of the bit string transmitted by the first fire detector, On the receiver side, the address of the fire detector of the second report in addition to the first report can be specified from the order of the address bit signal in the bit string, and necessary display and control can be performed.

  In addition, the fire detectors that are issued after the second report prohibit the sending of a common fire signal, so the alarm current that flows through the sensor line as a common fire signal is the first fire detection. The alarm current does not increase even if multiple fire detectors are triggered. As a result, the voltage on the sensor line is maintained at the first alert state. Even if the number increases, the sensing line voltage does not decrease and the fire detector does not become inoperable.

In addition, for the third and subsequent alert detectors, as in the second report, send address bit signals in the order corresponding to the address of the bit string transmitted by the first fire detector. Thus, the address can be specified from the order of the bit strings received by the receiver at the address bit signal.

  FIG. 1 is an explanatory diagram of a fire alarm system according to the present invention. In FIG. 1, the sensor lines 2-1, 2-2,... N fire detectors 3 set with addresses 1 to n are connected together with a terminating resistor 4. As a fire sensor connected to the sensor lines 2-1 to 2-m, various fire sensors such as a smoke sensor and a heat sensor can be connected.

  The receiver 1 is provided with an MPU 5. An operation unit 7, an alarm display unit 8, a district display unit 9, a transfer output unit 10, and a memory 11 are provided for the MPU 5. In addition, receiving circuit units 6-1, 6-2,..., 6-m are provided on the sensor line side of the MPU 5 for each line, and each of the receiving circuit units 6-1 to 6-m has a sensor. Lines 2-1, 2-2 to 2 -m are drawn out.

  The reception circuit units 6-1 to 6-m receive the alarm current transmitted as a common fire signal by the fire alarm of the fire sensor 3 connected to the sensor lines 2-1 to 2-m. At the same time, a bit string transmitted following the common fire signal and an address bit signal included therein are received.

  The reception control unit 12 provided in the MPU 5 of the receiver 1 sequentially reads the reception signals of the reception circuit units 6-1 to 6-m, discriminates a common fire signal for each line, and displays an alarm, that is, a fire representative display. And district display (report line display). Also, the address of the alarm detector is identified from the order of the address bit signal in the received bit string following the common fire signal, and the fire detection is reported separately in the first and second reports on the district display section. Display the container address or district name.

  FIG. 2 shows an embodiment of the fire detector 3 of FIG. 1, taking a scattered light type smoke detector as an example. In FIG. 2, the fire detector 3 includes a rectifying circuit noise absorbing circuit 13, a switching circuit 14, a constant voltage / current limiting circuit 15, an operation indicator 16, an address setting circuit 17, an alarm control unit 18, an oscillation circuit 19, a light emission. An element 20, a light receiving element 21, an amplifier circuit 22, and a comparison circuit 23 are configured.

  Here, the rectifier circuit / noise absorption circuit 13 makes the current between the lines L and C nonpolar by using, for example, a diode bridge, a Zener diode, a capacitor, and further suppresses noise. The constant voltage / current limiting circuit 14 limits the supply current to the circuit section in the subsequent stage to a constant value in order to prevent a transient current on the lines L and C.

  During normal monitoring, the light emitting element 20 is pulse-driven by the oscillation circuit 19 to emit light periodically. When smoke is generated by a fire, light from the light emitting element 20 is scattered by the smoke and enters the light receiving element 21. The incident light is converted into a photocurrent, and after being amplified by the amplifier circuit 22, the signal is input to the comparison circuit 23.

  When this signal exceeds the specified value, the alarm control unit 18 counts in synchronization with the light emitting element 20, and when the predetermined count number is reached, the alarm signal is sent to the switching circuit 14. The switching circuit 14 is switched in response to this, and causes an alarm current as a common fire signal to flow between L and C of the sensor line. Also, the alarm control unit 18 turns on the operation indicator lamp 16 at the same time.

  The alarm control unit 18 is composed of, for example, a CPU and takes in a line voltage signal from the input side of the constant voltage / current limiting circuit 15 to monitor the signal state of the sensor line. Common fire signal transmission, bit string transmission, and address bit signal transmission synchronized with the bit string order corresponding to the self address. If the second report or later, address bit signals are transmitted in the order corresponding to the address of the bit string transmitted from the first fire detector.

  FIG. 3 is an explanatory diagram showing a fire alarm control function according to the present invention by taking out one of the sensor lines of FIG. In FIG. 3, the sensor line 2 drawn from the receiving circuit unit 6 provided in the receiver 1 has no. 1-No. A fire detector 3 in which an address indicated by n is set in advance is connected.

  As for the fire detector 3, a part of a switching circuit 14 in which a notification control unit 18 constituted by a CPU, a resistor R1 switched by an output signal from the notification control unit 18 and a transistor Q1 are connected in series is shown. . Address No. As shown in the alarm control unit 18 of the fire detector 3 to which 1 is assigned, the functions of the first report processing unit 25 and the second report processing unit 26 are provided therein.

  When the first report processing unit 25 detects a fire and issues the first report on the sensor line 2, the first report processing unit 25 transmits a bit string following the common fire signal and ranks the bit string corresponding to its own address. To send an address bit signal. The bit string transmitted after the common fire signal in the first report processing unit 25 is the maximum number of fire detectors that can be connected to the sensor line 2, and in this example, an n-bit bit string is transmitted.

  When the second report processing unit 26 detects a fire and issues the second report of the sensor line 2, the self-address of the bit string transmitted by the first report processing unit 25 of another fire sensor is issued. Address bit signals are transmitted in the order corresponding to. In the second report processing unit 26, even if a fire is detected and issued, transmission of a common fire signal is prohibited on the condition that it is the second report. Further, the first report processing unit 25 and the second report processing unit 26 repeatedly transmit a bit string and an address bit signal in the first and second report fire alarm states.

  FIG. 4 is a time chart showing the sensor line voltage and the sensor signal transmission operation by the first and second report control in FIG. 4A shows the detector line voltage, FIG. 4B shows the switching operation of the fire detector at address 2, and FIG. 4C shows the bit string output of the fire detector at address 2 as well. FIG. 4D shows the address bit output of the address 2 sensor, and FIG. 4E shows the address bit output of the address n sensor. In this example, the fire detector at the address n performs the second fire alarm.

  First, when the fire detector 3 at address 2 performs the first fire alarm at time t1, the transistor Q1 of the switching circuit 14 is turned on as shown in FIG. 4B, and the reception of FIG. By applying a power supply voltage of 24 volts to the machine 1, a common fire signal is transmitted by flowing a notification current determined by the resistance R <b> 2 and the resistance R <b> 1 of the fire detector 3 of the address 2 that has reported.

  Subsequently, as shown in FIG. 4C, the fire detector 3 at address 2 outputs n + 1 bit strings obtained by adding 1 to the number n of detectors connected to the sensor line 2 as shown in FIG. Here, the first bit numbered 0 is a start bit, the last n + 1 bits are end bits, and a bit string indicated by numbers 1 to n indicating the order corresponding to the sensor address is output between them. Yes.

  Here, since the first fire detector that has fired at time t1 is the fire detector 3 at address 2, the order of the bit string corresponding to that address 2, that is, the second bit string in FIG. 4C. In synchronization with the bit output timing, address bit output is generated as shown in FIG. In this address bit output, the rank of the bit string is detected by the fall of the second bit string at time t4, and the address bit is output after a predetermined time delay from the detection timing at time t4.

  The bit string output of FIG. 4C and the address bit output of FIG. 4D are input as AND outputs to the base of the transistor Q1 of the switching circuit 14, and as a result, as shown in the switching operation of FIG. 4B. The on-time of the bit string is widened by the address bit output, and the alarm current flows to the sensor line correspondingly. Therefore, the sensor line voltage in FIG. 4 (A) is equal to the increase of the pulse width due to the address bit output. The section where the voltage drops to 10V is widened.

  On the other hand, following the first fire alarm at the time t1 from the sensor at the address 2, the second fire alarm is issued from the fire sensor at the address n at the time t2. Since the fire alarm of the fire detector at address n is the second report, the switching circuit 14 is not turned on at time t2, and transmission of a common fire signal is prohibited for the second report.

  The fire detector 3 at address n, which is the second fire report, recognizes the bit string of FIG. 4C transmitted from the fire sensor at address 1 of the first report from the sensor line voltage, At the falling edge of the nth bit string corresponding to the self address n, that is, at the timing of time t5, it is recognized that the order of the bit string is nth corresponding to the self address n. This produces an address bit output as shown in FIG.

  For this reason, in the sensor line voltage, the time width during which the voltage drops to 10 V is widened by the address bit output corresponding to the second report from the fire detector at address n following time t5.

  A common signal, a bit string and an address bit signal output from the first address fire detector of the second report, and a signal generated by a change in the alarm current accompanying the address bit output from the second fire detector of the address n are output. The received signal is received by the receiving circuit unit 6 of the receiver 1, and the received signal is read by the MPU 5 of the receiver 1 shown in FIG.

  That is, the representative fire display and the district display are performed by the received fire common signal, and the address bit is based on the increase of the pulse width in the section where the alarm current flows in the bit string, that is, the section where the sensor line voltage in FIG. By determining the reception of the signal and determining the order in which the reception timing of the address bit signal is received in the bit string, the address 2 and address n of the sensor that issued the first and second reports are obtained. Identify and display address numbers and district names.

  FIG. 5 is a flowchart showing the alarm control process by the fire detector of the present invention. In FIG. 5, it is determined in step S1 whether or not it is a fire alarm of its own, and in normal monitoring without a fire alarm, the process proceeds to step S2, the signal state of the sensor line is read, and in step S3, another fire detector Check whether there is a report. If there is another fire detector report, the process proceeds to step S4, and the number of reports is counted.

  If it is determined in step S1 that the fire has been issued, the process proceeds to step S5, where it is determined whether the first report or the second report or later by referring to the counter of the number of reports at this time. If the counter value is 0, it is the first report, so the process proceeds to step S6, where a common fire signal is transmitted when the switching circuit is turned on, and then a bit string is transmitted in step S7.

  Along with the transmission of this bit string, an address bit signal is transmitted in synchronization with the order of the bit string corresponding to its own address in step S8. Next, in step S9, it is determined that a certain time has elapsed. If the fire is not restored in step S10, the process returns to step S1, and the process of steps S5 to S8 repeats the transmission of the common fire signal, bit string, and address bit signal.

  If it is determined in step S5 that the fire report is the second or later, the process proceeds to step S12, and the first report from the other fire sensor currently transmitted to the sensor line is obtained. The bit string based on the notification is read, and an address bit signal is transmitted in synchronization with the order of the bit string corresponding to its own address.

  The transmission of the address bit signal in the second report is also repeatedly transmitted at regular time intervals by repeating the loop of steps S9, S10, S5, and S12. If there is a fire recovery in step S10, an initialization process is performed in step S11, and then the process returns to step S1.

  FIG. 6 is a flowchart showing reception control processing by the fire receiver of the present invention. In FIG. 6, the signal states of a plurality of sensor lines are sequentially read from the receiving circuit unit in step S1, and if a common fire signal is received in step S2, the process proceeds to step S3, corresponding to the representative fire display and sensor line. Fire alarm processing, such as a designated district display.

  Next, in step S4, the bit string including the address bit signal transmitted from the first fire detector is received as the first report address signal, and what number from the position where the pulse width is expanded by the address bit signal in the bit string. The address is identified by discriminating whether it is a bit string, and the sensor address of the first report is displayed in step S5.

  In step S6, the second address signal in the bit string following the common fire signal is received and identified. In step S7, the second sensor address is displayed. The processes in steps S3 to S7 are repeated until the fire is restored in step 8.

  As shown in the time chart of FIG. 4, while the fire detector at address 2 performs the first fire alarm and transmits a common fire signal, the fire detector at address n continues to 2 When the first fire is issued, two address bit signals are output at the same bit string timing, so the receiver 1 receives two addresses, but whichever is the first Whether it is the address or the second address cannot be identified.

  In this case, the first received address is the first report, and the second received address is the second report. This is the case when two fire detectors are reporting at almost the same time or with a slight time delay, and even if the first and second reports are displayed in order of address, the time difference is very small, which is a particular problem. There is no.

  On the other hand, after a common fire signal is sent by the first report of the fire detector at address 2, an address bit is output at the timing of address 2 of the bit string, and then fire detection at address n is performed. When the instrument fires for the second report, the address bit signals of different bit strings are separated, so the address bit signal received in the first bit string is received in the first report and the subsequent bit string. The address bit signal can be distinguished from the second report.

  For the third and subsequent reports, the second report processing unit 26 of the fire detector 18 operates in the same manner as the second report, and corresponds to the self address of the bit string transmitted by the first fire sensor. In synchronism with the order, the address bit signal is similarly transmitted for the third and subsequent reports, and this can be discriminated on the receiver 1 side to recognize the issued sensor address.

In addition, this invention is not limited to said embodiment, The deformation | transformation which does not impair the objective and advantage is included, Furthermore, limitation by the numerical value shown to said embodiment is not received.

Explanatory drawing of the fire alarm system to which the present invention is applied Explanatory drawing of embodiment of the fire detector of FIG. Explanatory diagram showing a fire alarm control function according to the present invention by taking out one of the sensor lines of FIG. Time chart showing common fire signal and address signal transmission operations at the time of fire alarm in FIG. The flowchart which showed the alarm control processing by the fire detector of this invention The flowchart which showed the reception control processing by the fire receiver of this invention Time chart of alarm control in the conventional system

Explanation of symbols

1: Receivers 2-1 to 2-m: Sensor line 3: Fire sensor 4: Termination resistor 5: MPU
6-1 to 6-m: reception circuit unit 7: operation unit 8: alarm display unit 9: district display unit 10: message output unit 11: memory 12: reception control unit 13: rectifier circuit / noise absorption circuit 14: switching Circuit 15: Constant voltage / current limiting circuit 16: Operation indicator lamp 17: Address setting circuit 18: Alarm control unit 19: Oscillation circuit 20: Light emitting element 21: Light receiving element 22: Amplifier circuit 23: Comparison circuit 25: First report Processing unit 26: Second report processing unit

Claims (4)

In a fire alarm system in which a plurality of fire detectors are connected to a sensor line drawn from a receiver,
The fire detector is
When a fire is detected and the first report of the same sensor line is issued, a bit string is transmitted following a common fire signal and an address bit signal is transmitted in the order of the bit string corresponding to its own address. An eye processing unit;
When a fire is detected and the second report of the same sensor line is issued, the address bit signals in the order corresponding to the self address of the bit string transmitted by the first report processing unit of another fire sensor A second report processing unit for transmitting
With
The receiver includes a reception control unit that receives and alerts the common fire signal and identifies the address of the alarm detector from the order in which the address bit signal is received in the bit string. Fire alarm system.
2. The fire alarm system according to claim 1, wherein the first report processing unit of the fire detector transmits a bit string of the maximum number of fire detectors connectable to the sensor line following the common fire signal. A fire alarm system.
2. The fire alarm system according to claim 1, wherein the second report processing unit of the fire detector prohibits the transmission of a common fire signal for the second and subsequent fire alerts on the same sensor line. A characteristic fire alarm system.
  2. The fire alarm system according to claim 1, wherein the fire detector repeatedly transmits the bit string and the address bit signal.

Images