JP4683474B2 - Fire alarm system - Google Patents

Description

The present invention relates to a fire alarm facility in which a plurality of on / off type fire detectors having addresses set in a sensor line drawn from a receiver or a repeater are connected.

Conventionally, in a fire alarm facility in which an on-off type fire detector known as a P-type fire detector is connected to a sensor line from a receiver or a repeater, a terminating resistor or terminator is provided at the end of the sensor line. Connect to the sensor line and detect the specific breakage monitoring current or breakage monitoring voltage that flows depending on the termination resistance or termination impedance at the receiver or repeater to determine whether the sensor line is normal or broken. ing.
JP-A-8-249560 JP 2004-94314 A JP 2004-303038 A

  However, in such conventional disconnection monitoring, a termination resistor or terminator is required for each sensor line, and current consumption occurs at the termination resistor in addition to the current consumption of the fire detector, and the power supply capacity of the equipment Therefore, the power capacity of the current consumption of the fire detector plus the current consumption of the termination resistor is required, and as the number of lines increases, the power supply section becomes larger, which is an obstacle to power saving.

  In order to solve this problem, the current consumption is reduced by using a terminator that uses a capacitor or Zener diode instead of the termination resistor. However, the terminator is more expensive than the termination resistor. However, there is a problem that the equipment cost increases because the terminator is connected to each sensor line.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fire alarm system that can save power and reduce costs by monitoring disconnection of a sensor line without connecting a terminating resistor or terminator to the sensor line.

  In order to achieve this object, the present invention is configured as follows. The present invention provides a fire alarm system in which a plurality of on / off type fire detectors having addresses set in a sensor line drawn from a receiver or a repeater are connected.

The present invention per such fire alarm equipment,
When a fire detector receives a disconnection monitoring command output from a receiver or a repeater when the fire detector is set as a terminal detector by the presence / absence of a fire alarm And a termination response unit that outputs a termination response signal to
The receiver or repeater is provided with a command transmission unit that transmits a disconnection monitoring command to the sensor line, and a disconnection monitoring unit that monitors disconnection of the sensor line based on a termination response signal from the fire sensor. It is characterized by.

  Here, the command transmission unit of the receiver or repeater outputs a response pulse of the maximum address number or more following the command code as a disconnection monitoring command, and the termination response unit of the fire detector is set to the termination sensor If it is, the response pulse is counted and a termination response signal is output at a timing that matches the self address.

  The disconnection monitoring unit of the receiver or the repeater determines that the termination response signal is not received in response to the disconnection monitoring command, and determines that the termination is not normal when one termination response signal is received in response to the disconnection monitoring command. When a plurality of termination response signals are received in response to the monitoring command, it is determined that the termination sensor is not set correctly.

  When receiving the termination response signal, the disconnection monitoring unit of the receiver or the repeater acquires the address of the fire sensor set for termination and displays the sensor number.

  The termination response unit of the fire detector blinks the operation indicator when outputting the termination response signal in response to the disconnection monitoring command.

  When the disconnection monitoring unit of the receiver or repeater cannot receive the termination response signal from the fire detector that has been terminated, and determines that the disconnection has occurred, it has the largest address other than the address of the fire sensor that is currently terminated. A termination setting command may be transmitted to the fire detector to set the termination.

Furthermore, the receiver or repeater is provided with a termination resistance detection circuit that detects a termination resistor or a termination connected to the sensor line from the current or voltage of the sensor line, and performs termination setting for a plurality of fire detectors. In the absence, the disconnection monitoring unit of the receiver or repeater determines the presence or absence of disconnection of the sensor line based on the termination resistance detection signal from the termination resistance detection circuit.

  According to the fire alarm system of the present invention, by setting the termination setting to set the on / off type fire sensor connected to the terminal of the sensor line as the termination sensor, the receiver or the repeater periodically When the fire detector that has been terminated in response to the transmitted disconnection monitoring command outputs a termination response signal and the termination response signal is received by the receiver or repeater, it is determined that the sensing line is normal, and the termination response signal is When it becomes impossible to receive signals, it is judged that the sensor line is disconnected, and it is not necessary to monitor the disconnection of the sensor line connected to a terminating resistor or terminator, reducing current consumption and reducing power supply capacity, saving power and reducing costs. Reduction can be achieved.

  The on / off type fire detector has an address, counts the response pulses included in the disconnection monitoring command signal, and outputs the termination response signal at the timing of the response pulse that matches the self address. By determining the timing with the receiver or the repeater, the address of the fire detector set at the end can be acquired, and the detector number of the end fire detector can be displayed as necessary.

  In addition, the disconnection monitoring unit of the receiver or the repeater determines whether the sensing line is normal or disconnected based on the presence / absence of the termination response signal, and a plurality of termination response signals at different response pulse timings for one disconnection monitoring command. Is received, it is possible to determine a duplication setting abnormality that is erroneously set to a plurality of fire detectors connected to the same sensor line, and to change to a correct termination setting.

  In addition, when a termination response signal is sent out, it is possible to easily confirm which fire detector installed in the monitoring area is terminated by blinking the operation indicator light of the fire detector.

  In addition, when it is judged that the sensing line is disconnected without receiving the termination response signal from the fire detector that has been terminated, the termination setting is performed by the command from the receiver or repeater for the fire detector with the next largest address. The fire of the sensor line is normal until the disconnection is repaired by reconstructing the fire detector connected to the receiver or repeater for the position of the sensor line breakage. Fire monitoring can be continued within the range of the sensor.

Furthermore, assuming that a detector or a repeater of the present invention is connected to a fire sensor using an existing sensor line connected to a termination resistor, a termination resistance detection circuit is previously installed in the receiver or the repeater. In this case, no termination is set for the fire detector, and it is possible to determine whether the sensor line is normal or broken based on the detection result of the termination resistance detection circuit. The fire alarm system of the present invention can be applied using the sensor line connected to the terminal as it is.

FIG. 1 is a block diagram of an equipment configuration in which the present invention is applied to an R-type fire alarm equipment. In FIG. 1, a transmission line 16 and a repeater control line 18 are drawn out from the R-type receiver 10, and for example, a plurality of repeaters installed in each residence building are connected. Repeater in this embodiment is a relay 1 2 for connecting the on-off type fire sensor of the present invention is provided.

A sensor line 20 is drawn from the repeater 12 to which the present invention is applied, and on-off type fire sensors 14-1 to 14-n are connected to the sensor line 20, and the fire sensor 14-1 is connected. Addresses corresponding to the sensor numbers are set in each of .about.14-n. Incidentally sensor lines 20, in the case of using the existing sensitive knowledge unit circuit would terminating resistor 22 is connected as shown by a broken line.

  The R-type receiver 10 sequentially sends out a polling command to the transmission line 16 at regular intervals, specifying the sensor address, and the analog fire sensor 15 detects the polling command by itself at the timing of address matching. Fire detection data such as smoke concentration and temperature is transmitted, and the R-type receiver 10 determines the presence or absence of a fire by comparison with a fire threshold.

  On the other hand, in the repeater 12 to which the on-off type fire detectors 14-1 to 14-n according to the present invention are connected, when receiving a transmission synchronization command transmitted from the R-type receiver 10 at a constant period, In synchronization with this, disconnection monitoring commands and normal monitoring commands are alternately output to the sensor line 20.

  In response to the normal monitoring command, a response signal is transmitted if the fire detector normally receives, and if it cannot be received normally, the response signal is not transmitted, and the connection status (addition or disconnection) of the fire detector is determined.

  Of the plurality of fire detectors 14-1 to 14-n connected to the sensor line 20, the fire detector 14-n positioned at the end of the sensor line 20 has a terminal setting as a terminal fire sensor in advance. Has been done. The fire detector 14-n for which termination is set receives a disconnection monitoring command from the repeater 12 and sends a termination response signal. Therefore, the repeater 12 determines the presence or absence of disconnection of the sensor line 20 based on the termination response signal from the fire detector 14-n whose termination is set in response to the disconnection monitoring command.

  Here, the disconnection monitoring command transmitted as a downlink signal from the repeater 12 is a voltage signal, and the termination response signal as an upstream signal sent from the fire detector 14-n terminated for the disconnection monitoring command is a current. Signal.

  In the on-off type fire detectors 14-1 to 14-n, a command response signal for the command from the repeater 12 is sent at the end of the command from the repeater 12 as a response pulse equal to or more than the maximum number of addresses of the fire detector. In each of the fire detectors 14-1 to 14-n, the response pulse at the end of the command is counted, and if the pulse count value matches the preset self address, it is determined that the response timing is self. Then, a command response signal required at that time is output to the sensor line 20 as a current signal.

  Addressable transmission between the repeater 12 and the fire detectors 14-1 to 14-n adopting such a pulse count method has a limit on the number of response pulses provided at the end of the command. In this case, 38 pulses are output as response pulses.

  On the other hand, in the R-type receiver 10, a command code and an address are transmitted as a command for the sensor, and the number of addresses of the analog fire sensor 15 depends on the number of bits of the address, for example, a 7-bit address. Then, 127 addresses can be set, and a sufficient number of addresses can be secured as compared with the pulse count method on the repeater 12 side. For this reason, the address counting method on the repeater 12 side can be called a simple address method for the R-type receiver 10.

  When the fire detectors 14-1 to 14-n detect a fire and issue a fire, they output a fire interrupt signal to the sensor line 20. When the repeater 12 receives the fire interrupt signal from the sensor line 20, the repeater 12 acquires the address of the fire detector that has been notified by the alarm detector search, and sends the fire interrupt signal to the R-type receiver 10 of FIG. Send to fire alarm. Details of the fire interrupt from the fire detector will be described later.

  FIG. 2 is a block diagram showing an embodiment of the repeater 12 of the present invention in FIG. In FIG. 2, the repeater 12 includes a repeater CPU 24, a transmission circuit 26, a power supply unit 28, a booster circuit 30, a current detection circuit 32, a current limiting circuit 33, a transmission circuit 34, and a fire test circuit 36. The repeater CPU 24 is provided with functions of a relay processing unit 42, a command transmission unit 44, and a disconnection monitoring unit 46 as functions realized by program control.

  From the power supply unit 28 of the repeater 12, the sensor line 20 is drawn out via the booster circuit 30, the current detection circuit 32, and the current limiting circuit 33, and the fire detectors 14-1 to 14-n are connected. Here, termination is set for the fire detector 14-n.

  Whenever the transmission circuit 26 receives a transmission synchronization command from the R-type receiver 10 of FIG. 1 by the transmission circuit 26, the command transmission unit 44 provided in the repeater CPU 24 sends a disconnection monitoring command and a normal monitoring command in synchronization with this transmission circuit 34. The transmission circuit 34 outputs the signal as a downstream signal due to the voltage change of the sensor line 20.

Synchronously with the transmission of the command signal by the transmission circuit 34, the repeater CPU 24 outputs the boost signal E1 to the boost circuit 30 to hold the voltage of the sensor line at a specified boost voltage higher than the voltage in the steady monitoring state. When the command transmission is completed, the high voltage control signal E2 is output, and the voltage of the sensor line returns to the original voltage. As a result, the voltage change of the downstream signal is sufficiently secured, and the SN is increased . The disconnection monitoring command sent from the repeater 12 to the sensor line by the processing by the command transmission unit 44 is received by the fire detectors 14-1 to 14-n, and the fire detector 14-n for which the termination setting is performed is performed. Sends a termination response signal. The termination response signal is output as an upstream signal that changes the current of the sensor line.

  The upstream signal due to the current change in the sensor line 20 is detected by the current detection circuit 32 of the repeater 12 and converted into, for example, a voltage signal, detected by the comparison process of the comparator in the response signal detection circuit 38, and responded to the repeater CPU 24. Input as signal E4.

  The disconnection monitoring unit 46 provided in the repeater CPU 24 monitors disconnection of the sensor line 20 based on the termination response signal from the fire detector 14-n that has been terminated. In this sensor line disconnection monitoring, if one termination response signal is received in response to the disconnection monitoring command, it is determined to be normal, if no termination response signal is received, it is determined to be disconnected, and a plurality of termination response signals are received. In this case, it is determined that the duplication setting of the end sensor is abnormal.

  When the disconnection monitoring unit 46 determines that the sensor line is disconnected or the termination detector is overlapped, the R-type receiver 10 of FIG. Notification is given and a fault alarm is displayed.

  The detector failure detection circuit 39 provided in the repeater 12 is a failure response signal E5 due to detection of failure or address duplication on the fire detectors 14-1 to 14-n side when a normal monitoring command is transmitted from the command transmitter 44. Is detected from the current detection circuit 32 and output to the repeater CPU 24. When a sensor abnormality is determined, a sensor failure is transmitted to the R-type receiver 10 side of FIG. .

  The termination resistance detection circuit 40 provided in the repeater 12 functions when the termination resistance 22 is connected to the end of the sensor line 20 as indicated by a broken line. In the fire alarm system of the present invention, it is not necessary to connect a terminating resistor or terminator to the end of the sensor line 20, but when applied to an existing sensor line, the terminating resistor is already connected. In this case, the repeater 12 and the fire detectors 14-1 to 14-n of the present invention can be connected as they are without removing the terminating resistor 22 from the existing sensor line.

  When an existing sensor line connected to the termination resistor 22 is used, termination setting is not performed for the fire sensor 14-n located at the end, and disconnection monitoring is performed by the termination resistor 22. In order to perform disconnection monitoring by the termination resistor 22, the repeater 12 is provided with a termination resistor detection circuit 40.

  The termination resistance detection circuit 40 detects the presence or absence of a termination resistance from the current detection signal of the current detection circuit 32 by comparison with a comparator at the timing immediately after the transmission of the disconnection monitoring command by the command transmission unit 44, and generates a termination resistance detection signal E6. Read into the repeater CPU 24 to determine the presence or absence of disconnection.

  That is, if a disconnection monitoring current within a predetermined range determined by the impedance of the termination resistor 22 can be detected, the sensor line is determined to be normal, and if the current is out of the disconnection monitoring current range, the sensor line disconnection is determined.

  Thus, in the repeater 12 of the present invention, the disconnection monitoring by the disconnection monitoring command by the termination setting of the fire detector 14-n arranged at the termination, and the termination resistance detection circuit 40 when the termination resistor 22 is connected are performed. Either one of the disconnection monitoring can be selectively used.

The current limiting circuit 33 relaxes the current limitation necessary for the lighting control of the operation indicator lamp of the fire detector that is issued by the control signal E3 from the CPU 24. Normally, the current limit is set to 25 mA, for example, so that one fire detector operation indicator can be turned on by the first fire report. The current limit is relaxed to 45 mA, for example, in order to be able to turn on one operation indicator lamp. The current limit control is performed by a control command from the R-type receiver 10 in FIG.

  When the relay CPU 24 receives the recovery command from the R-type receiver 10, the relay CPU 24 outputs a control signal E 7 to the power supply unit 28 to transmit the line cut of the sensor line 20 and the recovery command. When the line cut of the sensor line 20 and the restoration command are transmitted, the fire sensors 14-1 to 14-n can be restored to the initial state.

  It is also possible to connect the sensor line 20 with an on / off fire detector having no transmission function and an on / off fire sensor having an addressable function. The on / off fire detector having an addressable function can be restored to the initial state by a restoration command.

The repeater processing unit 42 of the repeater CPU 24 processes a fire alarm based on the fire detection of the fire detectors 14-1 to 14-n. When a fire is detected on the fire detectors 14-1 to 14-n side, for example, three times at regular intervals at the timing of the idle time of the disconnection monitoring command and the normal monitoring command by the command transmission unit 44, the fire detector 14- A fire interrupt signal is output from 1 to 14-n .

  This fire interrupt signal is detected by the current detection circuit 32 and the response signal detection circuit 38 and is captured by the repeater CPU 24. When the first fire interrupt signal is received by the relay processing unit 42, a sensor number search command is transmitted. The information is sent from the circuit 34 to the detector side, and the address of the fire detector that has issued the alarm is acquired.

  Similarly, for the second fire interrupt signal, issue the alarm detector search command to obtain the address of the alarm detector that triggered the alarm, and confirm the alarm detector address if the two addresses match. To do. When the third fire interrupt signal is obtained, the fire is determined and a fire alarm is transmitted by transmitting a fire interrupt signal to the R-type receiver 10 of FIG.

  At the same time, the alarm indicator control command is issued to the sensor line, and the alarm indicator lamp of the fire detector that has issued the alarm is turned on. This alarm indicator control command functions as a fire interrupt prohibition command for non-alarm fire detectors, and when the first fire alarm is confirmed, the second and subsequent fire alarms are issued. The fire interrupt signal is not output in the report.

In order to detect the second and subsequent fire reports, the repeater processing unit 42 transmits a sensor number search command at the reception timing of the fire interrupt signal until a recovery instruction is issued. For this reason, when the second and subsequent fires are issued by the fire detector, the fire detector that is currently in response to the sensor number search command from the repeater 12 will respond to the response pulse included in the command. And the search response signal is output at a timing coincident with its own address, whereby the repeater obtains the address of the fire detector that has newly issued, and can determine the second and subsequent fire alarms.

  The fire test circuit 36 provided in the repeater 12 receives a test monitoring signal from the repeater CPU 24, and the fire detection circuit 14-1 to 14-n fires to the current detection circuit 32. When the test processing is completed, the fire test operation is stopped in response to the test end signal. Further, the repeater processing unit 42 transmits the sensor test command to the sensor line, thereby performing the test operation of the fire sensors 14-1 to 14-n and making the result respond.

  FIG. 3 is a block diagram showing an embodiment of the fire detector according to the present invention in FIG. In FIG. 3, the fire detector 14 is an addressable on / off type fire detector, and includes a nonpolar / noise absorption circuit 50, constant voltage circuits 52 and 54, a reset monitoring circuit 56, a sensor CPU 60, an EEPROM circuit 62, and a pulse drive. Circuit 64, temperature detection element 66 using a thermistor, temperature detection circuit 68, fire test circuit 70, transmission signal detection circuit 72, response signal transmission circuit 74, operation indicator light selection circuit 76, recovery signal detection circuit 78 and transfer report An output circuit 80 is provided.

  The nonpolar / noise absorbing circuit 50 absorbs noise at the same time as making the connection polarity to the terminals L and C of the sensor line 20 nonpolar. The constant voltage circuit 52 outputs a DC voltage of, for example, 9 volts necessary for the sensor circuit. The constant voltage circuit 54 outputs a power supply voltage of, for example, 3 volts necessary for the operation of the sensor CPU 60.

  The reset monitoring circuit 56 detects the rising of the constant voltage circuit 54 due to power-on, and starts the reset for the sensor CPU 60. The sensor CPU 60 is provided with functions of a fire detection unit 82, a termination setting unit 84, and a termination response unit 86 as functions realized by program control. The EEPROM circuit 62 is a non-volatile memory, and stores an address corresponding to the sensor number and termination setting information when the termination sensor is set in addition to various setting information necessary for the fire sensor 14. .

  Information stored in the EEPROM circuit 62 is read when the reset monitoring circuit 56 starts the power-on reset of the sensor CPU 60 and developed in the RAM in the sensor CPU 60, and processes such as fire detection, disconnection monitoring, sensor failure, etc. Used for necessary control.

The termination setting information for the EEPROM circuit 62 is basically performed for a fire sensor used as a termination sensor at the factory shipment stage. In the present invention, termination setting information is set during operation. If the disconnection based on the end response signal from the fire detector is detected, to EEPROM circuit 62 of another fire detector, a write to EEPROM circuit 6 2 for termination setting by a command from the address setting jigs I can do it.

  The pulse drive circuit 64 receives a timing signal from the sensor CPU 60 and outputs drive pulses at regular intervals to a temperature detection element 66 using a thermistor or the like, and the temperature detection circuit 68 generates a detection current of the temperature detection element 66. Based on the temperature detection, a temperature detection signal is input to the sensor CPU 60.

  The fire test circuit 70 operates in response to a test control signal from the sensor CPU 60 based on the sensor test command from the repeater 12, and causes the temperature detection circuit 68 to perform a test report in a pseudo fire temperature detection state. If the test report is obtained normally, it responds to the test result search command received following the sensor test command. If the test report fails, the response count of the test result search command is counted. The response signal is not transmitted at the self address timing.

  The transmission signal detection circuit 72 detects voltage changes of various commands, which are downstream signals of the sensor line obtained via the nonpolar / noise absorption circuit 50, and outputs them to the sensor CPU 60. The response signal transmission circuit 74 receives a response signal from the sensor CPU 60, for example, a termination response signal with respect to the disconnection monitoring command, converts this into an upstream signal of current change, and transmits it to the sensor line 20.

  The operation indicator selection circuit 76 receives a control signal when the sensor CPU 60 receives an operation indicator control command from the repeater 12 in the fire alarm state, and turns on the operation indicator provided in the fire detector 14. I do. Note that the operation indicator light control command from the repeater 12 functions as a fire interrupt prohibition command in a non-reporting fire detector. The recovery circuit detection circuit 78 receives the recovery command from the repeater 12, outputs a recovery detection signal to the sensor CPU 60, and cancels the fire detection state.

  When the fire is detected by the sensor CPU 60, the transfer output circuit 80 outputs a report transfer signal as a P-type fire detector to another device connected to the transfer terminal. The fire sensor 14 in FIG. 3 is a heat sensor using a temperature detection element 66 such as a thermistor, but may be a smoke sensor having a scattered light type smoke detection mechanism.

  FIG. 4 is a time chart of a disconnection monitoring command by the repeater 12 of FIG. FIG. 4A shows a transmission synchronization command 88 output from the R-type receiver 10 of FIG. 1 to the repeater 12, and is output at a constant cycle T1, for example, T1 = 9 seconds. In synchronization with this transmission synchronization command 88, as shown in FIG. 4B, the repeater 12 sends a disconnection monitoring command 90 at an odd timing of the transmission synchronization command 88 and transmits a normal monitoring command 92 at an even timing, for example. . At the timing immediately after the disconnection monitoring command 90 is sent from the repeater 12, termination resistance detection is performed by the termination resistance detection circuit 40 provided in the repeater 12 as shown in FIG.

FIG. 4D is a time chart of the disconnection monitoring command and response processing when the sensor line is disconnected. In FIG. 4D, when the termination response signal is not received from, for example, a fire detector terminated by disconnection, for the first transmission of the disconnection monitoring command 90, an abnormal response occurrence 94-1 is determined. When the abnormal response occurrence 94-1 is determined in this way, the disconnection monitoring command 90 is continuously sent as the next command so that the maximum number of retries is four, for example, instead of the normal monitoring command.

If the termination response signal is not obtained in response to the second disconnection monitoring command 90, the retry abnormality response continuation 94-2 is determined. Subsequently, if the termination response signal is not obtained in response to the third disconnection monitoring command 90, the retry abnormality response continues 94-3, and the fourth disconnection monitoring command 90 is transmitted. If the relative fourth disconnection monitoring command 90 without terminating the response signal is obtained, the abnormal response confirmation 9 6, and the determined disconnection at this time, the notification of the disconnection fault occurs for R-type receiver 10 is performed become.

  FIG. 5 is a time chart of a command transmission downlink signal and a command response uplink signal between the repeater 12 and the fire detectors 14-1 to 14-n in FIG. FIG. 5A shows a downstream signal transmitted as a command, which includes a start pulse 98, a reference pulse 100, a command 102, data 104, and 38 response pulses 105 corresponding to the number of sensor addresses.

  Here, the code of the command 102 is, for example, hexadecimal “XXh”, for example, the disconnection monitoring command is the code “04h”, the normal monitoring command is the code “08h”, and the EEPROM write command is the code “F8h” Is used.

  FIG. 5B is an upstream signal when all of the fire detectors 14-1 to 14-38 send a command response signal, and is output as a current signal at the timing of the idle time of the response pulse of the downstream signal. .

  FIG. 5C shows the timing of the command response signal in each of the fire detectors 14-1 to 14-38 in which the addresses 1 to 38 are set, and each of the fire detectors 14-1 to 14-38 is a downstream signal. Each of the response pulses 105 is counted, and when a pulse count that matches a preset self address is reached, it is determined that the response timing is based on the self address, and command response signals 106-1 to 106-38 are sent as current signals, respectively. To do.

  Of the fire detectors 14-1 to 14-n connected to the sensor line of the repeater 12 in FIG. 2, the termination is set in the fire detector 14-n, that is, FIG. For example, when the disconnection monitoring command is sent as the down signal of FIG. 5A, only the fire detector 14-38 at address 38 is the last address in FIG. A command response signal 106-38 as a termination response signal as an upstream signal is output.

  Further, FIG. 5D shows the clock operation of the sensor CPU 60 provided in the fire sensor 14 of FIG. 3, and the processing speed is increased by switching from the low-speed clock to the high-speed clock over the command transmission period. I am doing so.

  FIG. 6 is a flowchart of repeater processing in the repeater 12 of FIG. In FIG. 6, the repeater process performs an initialization process associated with power-on start in step S1, and then checks whether or not a fire interrupt signal is received from the fire detector in step S2. When the first fire interrupt signal is received, a notification address search process is executed in step S3. The notification address search processing sends a notification address search command to the sensor line, and transmits a notification response signal at the timing of the notification sensor address in the response pulse, so that the detected sensor address is obtained. Search for.

  Subsequently, the reception of the second fire interrupt signal is checked in step S4. When the second fire interrupt signal is received, the notification address search process is similarly executed in step S5 as in the first time. Subsequently, in step S6, the reception of the third fire interrupt signal is checked. When the third fire interrupt signal is received, the process proceeds to step S7, and the fire interrupt signal is obtained three times in succession. In this way, the fire is determined, and a warning indicator lamp control command is issued as a warning indicator lamp on control in step S8. The alarm indicator control command functions as a fire interrupt prohibition command for non-alarm fire detectors. Further, in step S9, a fire interrupt signal is transmitted to the R-type fire receiver 10 of FIG. 1 to display a fire alarm.

  Although not shown in the flowchart, after the fire is confirmed, the sensor address search command is continuously transmitted at the same timing as the fire interrupt signal. An address response signal is received to determine whether the fire detector is continuously activated on the same sensing line.

  After the fire is confirmed, it is checked whether or not a recovery command is received from the receiver in step S10. When the recovery command is received, power is supplied to the sensor line by line cut by the power supply unit 28 in step S14. Once it is shut off and restored, the fire detector that has been reported is restored.

  In step S12, it is checked whether or not a transmission synchronization command is received from the R-type receiver 10 of FIG. When a transmission synchronization command is received, normal monitoring processing is performed in step S13. This normal monitoring process is executed at an even timing of the transmission synchronization command. Furthermore, it progresses to step S14 and a disconnection monitoring process is performed. This disconnection monitoring process is executed at an odd timing of the transmission synchronization command.

  Such processes of steps S1 to S14 are repeated until a stop instruction is issued in step S15.

  FIG. 7 is a flowchart of the disconnection monitoring process in step S4 of FIG. In FIG. 7, in the disconnection monitoring process, it is checked whether or not the transmission synchronization command is received at an odd timing in step S1, and if it is an odd timing, the process proceeds to step S2 to output a disconnection monitoring command. Subsequently, termination resistance detection processing by the termination resistance detection circuit 40 is performed in step S3.

  In step S4, the abnormal content is determined from the termination response signal as the command response signal and the termination resistance detection result. In this embodiment, the presence / absence of an abnormality is determined from the termination response signal from the fire sensor set at the termination and the termination resistance detection result by the termination resistance detection circuit 40. This abnormality determination is as follows.

(1) The sensor line is normal when there is a termination response signal and there is no termination resistance, or when there is no termination response signal and there is a termination resistance.
(2) The disconnection abnormality is a case where there is no termination response signal and no termination resistance.
(3) Termination overlap setting abnormality is when there are a plurality of termination response signals and there is no termination resistance, or when there are one or more termination response signals and there are termination response signals.

  Such determination of the disconnection abnormality of the sensor line is performed by the processing of steps S5 to S9. That is, if there is no command response signal in step S5 and there is no termination resistor, the process proceeds to step S6 and it is determined that the disconnection is abnormal. If there are a plurality of command response signals and there is no termination resistor in step S7, or if there is one command response signal and there is a termination resistor in step S8, the process proceeds to step S9 to determine termination duplication setting abnormality. .

  On the other hand, if none of step S5, step S7, or step S8 is applicable, the process proceeds to step S12, and the sensor line is determined to be normal. The processes of steps S1 to S9 are repeated until the number of retries predetermined in step S10, for example, 4 is reached. If the same abnormality determination result is reached even when the number of retries is reached four times, the process proceeds to step S11, where the determined abnormality is confirmed and a corresponding process is performed.

  FIG. 8 is a flowchart of sensor processing in the fire sensor of FIG. In the sensor process of FIG. 8, after the initialization process associated with the power-on reset is performed in step S1, whether or not a disconnection monitoring command is received is checked in step S2, and if a disconnection monitoring command is received, step S3 is performed. In step S4, the presence / absence of the termination sensor is checked, and if it is set, a termination response signal is output at the timing of the self address of the response pulse in step S4.

  On the other hand, if the reception of the normal monitoring command is determined in step S5, a normal response signal is output at the timing of the self address of the response pulse in step S6.

  Subsequently, whether or not a fire is detected is checked in step S7. If it is determined that a fire is detected, a fire interrupt signal is output in step S8. In response to the first fire interrupt signal, if the reception of the notification address search command sent from the repeater 12 is determined in step S9, the search response signal is output at the timing of the self-address of the response pulse in step S10. .

Subsequently, after outputting the second fire interrupt signal in step S11 and receiving the notification address search command from the repeater 12 in step S12, in step S13, the response address pulse self-address timing is also received in step S13. A search response signal is output . After outputting the fire interrupt signal the third at step S14 Subsequently, when it is determined in step S15 to receive the alarm indicator control command from the relay device 12 in against this, the alarm display lamp in step S16 Control the lighting state. Such processes of steps S2 to S16 are repeated until there is a stop instruction (sensor line power off) in step S17.

FIG. 9 is a time chart of termination setting change processing when disconnection is determined by the repeater 12 of FIG. For example, in the fire detector 14-1 to 14-n connected to the repeater 12 in Figure 1, with the end setting fire detector 14-n is located at the end it is performing performed by fire monitoring, Assume that a disconnection failure has occurred in the sensor line before the fire sensor 14-n.

  When the disconnection abnormality of the sensor line is determined by the repeater 12, the repeater 12 next sends a termination setting command specifying the address (n-1) having the maximum address, and the sensor line is disconnected. Switch from the fire sensor 14-n that has been terminated until now to the termination setting of the fire sensor 14- (n-1) that is located at the terminal that is functioning effectively after disconnection.

  The termination setting is switched through a write command for the EEPROM shown in FIG. 9A and a subsequent write confirmation processing procedure. In the write command based on the down signal in FIG. 9A, write control and verification (verification) are performed collectively.

  First, the write command includes a start pulse 98, a reference pulse 100 (command + sensor number (address) + data × 4), and a response pulse 110. When the fire sensor normally receives a write command with respect to the write command, a normal reception response signal 112 is output at the timing of the idle time of the response pulse 110 as shown in FIG.

  When the normal reception response signal 112 is obtained, an ACK signal 114 is transmitted as a downstream signal at a timing immediately thereafter. Upon receiving this ACK signal 114, the fire detector writes data to the EEPROM circuit 62, that is, writes termination setting information. The write completion signal 116 is returned as an upstream signal.

  Subsequently, the verification pulse 118 of FIG. 9A is output, and the write data 119 of FIG. 9B is responded to the verification pulse 118 from the fire detector side. As shown in FIG. 9C, the clock of the sensor CPU 60 is switched from low speed to high speed during the writing period of the termination setting information from the repeater 12 to the EEPROM circuit 62.

  FIG. 10 is a block diagram of an equipment configuration in which the present invention is applied to an addressable P-type fire alarm equipment. In FIG. 10, on-off type fire detectors 14-1 to 14-n to which addresses are set according to the present invention are connected to the sensor line 20 drawn from the P-type receiver 11. When the sensor line 20 is an existing sensor line, the termination resistor 22 is connected as shown by a broken line.

  FIG. 11 is a block diagram showing an embodiment of the P-type receiver 11 according to the present invention in FIG. The receiver CPU 120 of the P-type receiver 11 corresponds to the repeater CPU 24 of FIG. 2 and is provided with a fire monitoring unit 132 as a function unique to the receiver, but the other command transmission unit 44 and disconnection monitoring unit 46 are It is the same as the repeater 12 of FIG.

  Further, a booster circuit 30, a current detection circuit 32, a current limiting circuit 33, a transmission circuit 34, a fire test circuit 36, a response signal detection circuit 38, a sensor failure detection circuit 39, and a termination resistance detection provided as peripheral circuits of the receiver CPU 120. The configuration and operation of the circuit 40 are basically the same as those of the repeater 12 of FIG.

  A power supply unit 122 is provided for the receiver CPU 120, and a display unit 124, an operation unit 126, an acoustic alarm unit 128, and a transfer unit 130 are provided as a configuration unique to the receiver. The fire detectors 14-1 to 14-n connected to the sensor line drawn from the P-type receiver 11 have the same configuration and operation as the fire detector 14 shown in the embodiment of FIG. .

  FIG. 12 is a time chart of a disconnection monitoring command by the P-type receiver of FIG. FIG. 12A shows a sensor line command, and a disconnection monitoring command 90 and a normal monitoring command 92 are alternately sent at predetermined intervals T1. Also, as shown in FIG. 12B, the AD conversion operation, that is, the termination resistance detection operation by the termination resistance detection circuit 40 provided in the P-type receiver 11 is performed immediately after the disconnection monitoring command 90 is sent.

FIG. 12C is a time chart of the disconnection monitoring command and response processing at the time of disconnection detection. If a termination response signal cannot be obtained from the fire detector 14-n that is terminated with respect to the disconnection monitoring command 90, an abnormality is detected. After determining the response occurrence 74-1 and performing a retry operation for sending the disconnection monitoring command 90 continuously up to four times including the first abnormal response occurrence, a termination response signal for the fourth disconnection monitoring command 90 is obtained. If not, the abnormal response is confirmed 96 , and the disconnection is confirmed and a disconnection alarm is displayed.

  FIG. 13 is a flowchart of receiver processing in the P-type receiver 11 of FIG. In FIG. 13, the receiver process performs an initialization process associated with power-on start in step S1, and then checks whether or not a fire interrupt signal is received from the fire detector in step S2. When the fire detector detects a fire, it sends a fire interrupt signal three times in a row.

  The reception of the fire interrupt signal for three times is discriminated in each of steps S2, S4 and S6. For the first time, the alarm address search process is executed in step S3, and for the second time, the alarm is issued in step S5. The address search process is executed, and for the third time, a fire is determined in step S7, and a command for alarm indicator lamp on control is issued in step S8. In step S9, a fire alarm process is performed according to the fire confirmation.

Although not shown in the flowchart, after the fire is confirmed, the sensor address search command is continuously transmitted at the reception timing of the fire interrupt signal. An address response signal is received to determine whether the fire detector is continuously activated on the same sensing line.

  After the fire is confirmed, the presence or absence of a restoration instruction is checked in step S10. When the restoration instruction is determined, in step S11, the power supply to the sensor line 20 is temporarily cut off by the line cut by the power supply unit 122 and restored. In this way, the fire detector that has been reported is restored.

  Subsequently, in step S12, it is checked whether or not the command transmission timing is reached. When the command transmission timing is determined, normal monitoring processing is executed in step S13. Subsequently, disconnection monitoring processing is executed in step S14. The disconnection monitoring process in step S14 is the same as the disconnection monitoring process in the case of the repeater 12 shown in FIG. Such processes of steps S1 to S14 are repeated until a stop instruction is issued in step S15.

  The above embodiment can be applied to the case where the termination resistor detection circuit 40 is provided in the repeater 12 of FIG. 2 or the P-type receiver 11 of FIG. 11 and the termination resistor 22 is connected to the sensor line. Although the above embodiment is taken as an example, the termination resistance detection circuit 40 is not necessary when used for a sensor line in which the termination resistance 22 is not planned to be connected.

  In the above embodiment, only the addressable on / off type fire detectors 14-1 to 14-n according to the present invention are connected to the sensor line 20 from the repeater 12 or the P-type receiver 11 as an example. However, it may be connected to a sensor line mixed with a normal on / off type fire sensor.

  For example, among a plurality of fire detectors connected to the detector line, the fire detector connected to the terminal is the fire detector 14 according to the present invention, and other fire detectors are normal on-off type fires. In the case of the sensor, the disconnection of the sensor line can be monitored by the disconnection monitoring command for the fire sensor of the present invention that has been terminated without using a termination resistor.

The present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

Block diagram of equipment configuration applying the present invention to R-type fire alarm equipment The block diagram which showed embodiment of the repeater of this invention in FIG. FIG. 1 is a block diagram showing an embodiment of a fire detector according to the present invention. Time chart of disconnection monitoring command by boiled repeater in Fig. 2 Time chart of command transmission downlink signal and command response uplink signal between repeater and fire detector of FIG. Flowchart of repeater processing in the repeater of FIG. Flowchart of disconnection monitoring process in step 4 of FIG. Flowchart of sensor processing in the fire sensor of FIG. Time chart of change processing of termination setting when disconnection is determined by repeater in FIG. Block diagram of equipment configuration in which the present invention is applied to an addressable P-type fire alarm equipment FIG. 10 is a block diagram showing an embodiment of the receiver of the present invention. Time chart of disconnection monitoring command by receiver of FIG. Flowchart of receiver processing in the receiver of FIG.

Explanation of symbols

10: R type receiver 11: P type receiver 12: Repeater 14, 14-1 to 14-n: Fire detector 15: Analog fire detector 16: Transmission line 18: Repeater control line 20: Sensor line 22: Terminating resistor 24: Repeater CPU
26: transmission circuit 28, 122: power supply unit 30: booster circuit 32: current detection circuit 33: current limiting circuit 34: transmission circuit 36, 70: fire test circuit 38: response signal detection circuit 39: sensor failure detection circuit 40: Termination resistance detection circuit 42: Relay processing unit 44: Command transmission unit 46: Disconnection monitoring unit 50: Nonpolar / noise absorption circuit 52, 54: Constant voltage circuit 56: Reset monitoring circuit 60: Sensor CPU
62: EEPROM circuit 64: Pulse drive circuit 66: Temperature detection element 68: Temperature detection circuit 72: Transmission signal detection circuit 74: Response signal transmission circuit 76: Operation indicator lamp selection circuit 78: Restoration signal detection circuit 80: Transfer output circuit 82: Fire detection unit 84: Termination setting unit 86: Termination response unit 88: Transmission synchronization command 90: Disconnection monitoring command 92: Normal monitoring command 98: Start pulse 100: Reference pulse 102: Command 104: Data 105: Response pulse 106 -1 to 106-38: Command response signal 120: Receiver CPU
124: Display unit 126: Operation unit 128: Acoustic alarm unit 130: Transfer unit 132: Fire monitoring unit

Claims (6)

In a fire alarm facility in which a plurality of on-off type fire detectors with addresses set in the sensor line drawn from the receiver or repeater are connected,
In the fire detector,
An end setting unit for setting whether or not the end fire detector,
A termination response unit that outputs a termination response signal when receiving a disconnection monitoring command transmitted from the receiver or the repeater when the termination setting unit sets the termination sensor;
Provided,
In the receiver or repeater,
A command transmitter for transmitting a disconnection monitoring command to the sensor line;
A disconnection monitoring unit for monitoring disconnection of the sensor line based on the termination response signal from the fire sensor;
Provided ,
When the disconnection monitoring unit of the receiver or the repeater determines that the sensor line is disconnected, it sends a termination setting command to the fire sensor having the maximum address other than the address of the currently terminated fire sensor. The fire alarm equipment is characterized in that the termination is set .
In the fire alarm facility according to claim 1,
The command transmission unit of the receiver or repeater outputs a response pulse of a maximum address number or more following the command code as the disconnection monitoring command,
The fire alarm of the fire sensor, when set to a terminal sensor, counts the response pulse and outputs the terminal response signal at a timing that matches the self-address. Facility.
2. The fire alarm system according to claim 1, wherein a disconnection monitoring unit of the receiver or the repeater determines that a disconnection is received when no termination response signal is received with respect to the disconnection monitoring command, and terminates with respect to the disconnection monitoring command. A fire alarm facility characterized in that when one response signal is received, it is determined as normal, and when a plurality of termination response signals are received in response to the disconnection monitoring command, it is determined that there is a duplication setting error in the termination detector.
In the fire alarm system according to claim 1, the disconnection monitoring unit of the receiver or the repeater receives the termination response signal, obtains the address of the fire sensor set for termination, and sets the sensor number. Fire alarm equipment characterized by displaying.
The fire alarm system according to claim 1, wherein the termination response unit of the fire detector blinks an operation indicator when outputting a termination response signal in response to the disconnection monitoring command. Notification equipment.
In the fire alarm facility according to claim 1,
Further, the receiver or the repeater is provided with a termination resistance detection circuit for detecting a termination resistor or a termination connected to the end of the sensor line from the current or voltage of the sensor line,
In a state in which the termination setting is not performed for the plurality of fire detectors, the disconnection monitoring unit of the receiver or the repeater detects whether or not the sensor line is disconnected based on a termination resistance detection signal from the termination resistance detection circuit. Fire alarm equipment characterized by determining

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