JP2686081B2 - Self-fire alarm system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a self-fire alarm system in which a receiver centrally monitors analog fire information detected by a plurality of sensors. [Background Art] Generally, this type of self-warning system, which centrally monitors analog fire information detected by a plurality of detectors by a receiver, detects heat, smoke, etc., as shown in FIG. A plurality of detectors equipped with an A / D converter that converts the analog fire signal output from the fire sensor into fire data 1 ₁ , 1 ₂ , 1, ₃ ...
When each sensor 1 _1, 1 _2, 1 ₃ ...... a is composed of a receiver 2 for centralized monitoring, each sensor from the receiver 2 via a pair of signal lines 3 1 _1, 1 _2, 1 ₃ ... is supplied with power, and the receiver 2 polls each of the sensors 1 ₁ , 1 ₂ , 1 ₃ ... to return fire data during a predetermined monitoring period. FIG. 4 shows the operation of polling the detectors 1 ₁ , 1 ₂ , 1 ₃ ... From the receiver 2 and returning the fire data.
The transmission signal V _S composed of the time division multiplexed signal transmitted from
As shown in FIG. 4 (a), the start pulse SP indicating the start of the signal, the address data AD for accessing the sensors 1 ₁ , 1 ₂ , 1 ₃ ... And the sensors 1 ₁ , 1 ₂ , 1 _The control signal CD for controlling the operation of ₃ ..., the checksum data CS, and the monitoring period WT are formed, and this transmission signal V _S is detected by the sensors 1 ₁ , 1 ₂ , 1 ₃
It is designed to be transmitted by superimposing it on the DC power supply voltage that feeds each circuit. On the other hand, each sensor 1 ₁ , 1 ₂ , 1 ₃ ......
Then, the address data AD that matches its own unique address
When received, the control data CD transmitted following the address data AD is taken in, and the predetermined fire data FD
As shown in FIG. 4 (b), the signal is returned by the return signal V _B which is a time division multiplexed signal superimposed on the DC power supply voltage during the monitoring period WT. By the way, the fire sensor of each sensor 1 ₁ , 1 ₂ , 1, ₃ ... that converts physical changes due to fire into electrical changes to detect fire information includes thermal type, smoke type, and smoke type. There are photoelectric type, ion type, etc., and there is a type of analog fire information for a fire event. Therefore, in the receiver 2, the fire information returned from each sensor 1 ₁ , 1 ₂ , 1 ₃ ... based on this type. Need to judge. Here, in the conventional self-fire alarm system, type data indicating the type of analog fire information is added to the fire data FD and returned to the receiver 2 during the monitoring period WT, and the receiver 2 converts this type data into this type data. The fire data FD is processed based on the fire data, and the alarm means is activated when it is determined that a fire is occurring. However, in such a conventional example, since the fire data FD with the type data added is returned within the limited monitoring period WT, the number of bits of the fire data FD is reduced by the number of bits of the type data. There is a problem that the number of bits of the fire data FD is limited by the return of the type data. [Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a self-fire alarm system in which the number of bits of fire data is not restricted by the return of type data. To provide. DISCLOSURE OF THE INVENTION (Structure) The present invention provides a plurality of detectors including an A / D converter that converts an analog fire signal output from a fire sensor that detects heat, smoke, etc., into fire data, and a plurality of detectors. It is configured with a receiver that centrally monitors the sensors of the above, and supplies power to each sensor from the receiver through a pair of signal lines, and polls each sensor from the receiver to fire in a predetermined monitoring period. In a self-fire alarm system that sends back data, a type output unit that inputs a type signal of a level according to the type of detector to the A / D conversion unit for a certain period from the rise of power supply The receiver is equipped with a type detection unit that detects the type data returned as data, and the type output unit of the detector is based on the analog fire signal in the normal state and the analog fire signal in the normal state. By providing a selection circuit that compares the level with the type signal set to a high level and selects and outputs the higher level signal, the number of bits of fire data is limited by the return of the type data. This is to provide a self-fired alarm system that never happens. (Embodiment) FIG. 1 shows an embodiment of the present invention. In the same self-fire alarm system as the conventional example, a fire sensor 10 for detecting heat, smoke, etc., and an analog fire output from the fire sensor 10 An amplifier 11 that amplifies the signal, an A / D converter 21 that converts the amplified analog fire signal into fire data FD, and the fire data FD is returned to the receiver 2 according to a predetermined return procedure (transmission signal V _S A transmission / reception processing unit 13 which returns to the monitoring period WT),
Type output unit 14 for inputting a type signal of a level corresponding to the type of sensor 1 ₁ , 1 ₂ , 1 ₃ ... (Hereinafter, referred to as sensor 1) to A / D conversion unit 12 for a certain period from the rise of power supply And with sensor 1
And a DC power supply voltage applied to the signal line 3 is turned on,
Turn off and send and return signal V _S
A transmission / reception processing unit 20 that says reception of V _B , a type detection unit 21 that detects the type data returned as fire data FD, and whether or not a fire has occurred is determined based on the type data and the fire data. Signal processing unit 22 for controlling the operation of the notification means 23
And form the receiver 2. Here, in the embodiment, the type output unit 14 of each sensor 1 obtains the line voltage detection unit 15 that detects the applied voltage of the signal line 3, that is, the rise of the line voltage, and the line voltage detection signal. For a certain period of time, a constant voltage generator 16 that generates a type signal of a predetermined level indicating the type of the sensor 1 is compared with the level of the analog fire signal and the type signal, and the signal with the higher level is detected. It is formed by a selection circuit 17 which selects and outputs. Also,
In the embodiment, the operation test unit 24, which appropriately operates the type output unit 14 and the type detection unit 21 to check the operation of the sensor 1 depending on whether or not the type detection result of the sensor 1 is a predetermined type, is provided. It is provided in the receiver 2. Hereinafter, the operation of the embodiment will be described. Now, in a normal state in which a predetermined power supply voltage (line voltage) is applied to the signal line 3, the analog fire signal amplified by the amplifier 11 is input to the A / D conversion unit 12, and the A / D The converted fire data FD is returned to the receiver 2 in a predetermined return procedure. That is, each sensor 1 takes in the control data CD when the address data AD matching its own unique address is received, and returns the fire data FD designated by the control data CD to the monitoring period WT. It has become. Fire data FD is time-division-multiplexed here.
The number of bits of is set according to the monitoring period WT. Next, when the power supply voltage applied to the signal line 3 is turned off for a certain period T ₁ and then turned on again,
The rise of the power supply voltage is detected by the line voltage detection unit 14, and as shown in FIG. ₂ , the constant voltage generation unit 16 determines the type of the sensor 1 for a certain period T ₂ after the power supply voltage is restored. The level Vm type signal is output. Since this type signal is set to a higher level than the analog fire signal in the normal state, the selection circuit 17 and the amplifier 11
The type signal is input to the A / D conversion unit 12 via the. Therefore, when the sensor 1 is polled by the receiver ₂ during this fixed period T ₂ , the type data A / D converted by the A / D converter 12 is returned to the monitoring period WT as fire data FD. It is supposed to be done. On the other hand, in the receiver 2, the type detection unit 21 detects the fire data FD, that is, the type data returned from the sensor 1 by the polling during the fixed period T ₂ , and recognizes and registers the type of each sensor 1. The signal processing unit 22
Then, the subsequent fire data FD determination process is performed based on the registered type data, and if it is determined that a fire has occurred,
The alarm means 23 is operated to notify the fire. Needless to say, the type setting of each sensor 1 when the power of the receiver 2 is turned on is performed in the same manner as the type setting operation at the time of line voltage restoration. Next, in the embodiment, the type output unit 14 and the type detection unit 21
Is operated to check the operation of the sensor 1 according to whether or not the type detection result of the sensor 1 is a predetermined type. The operation test section 24 is provided in the receiver 2 as appropriate. Is operated, the operation check of the sensor 1 can be easily performed without adding a special test control circuit and operation determination circuit. That is, conventionally, in this type of self-warning system, the detector 1
When checking the operation of the receiver 2, the receiver 2 transmits the control data indicating the test to the sensor 2 and causes the sensor 1 to operate in the pseudo-fire state (returns the fire data FD of the fire state). In this case, an operation check is performed by determining whether or not the fire data is normally received. In this case, a test control circuit for processing test control data is provided for each sensor 1
However, there is a problem that the cost becomes high. However, in the embodiment, when the operation test of the sensor 1 is performed, the power supply voltage applied to the signal line 3 is once turned off, and then the power supply voltage is applied again for a certain period T. ₂ , poll the sensor 1 to be tested and send back the type data, and check the operation of the sensor 1 depending on whether the returned type data matches the type of the sensor 1 registered in advance. Since the operation is performed and the operation of the sensor 1 is checked by using the type identification means, the test control means of the sensor 1 can be easily configured. [Effects of the Invention] As described above, the present invention includes a plurality of detectors each including an A / D converter that converts an analog fire signal output from a fire sensor that detects heat, smoke, etc., into fire data, and a plurality of detectors. It is configured with a receiver that centrally monitors the sensors of the above, and supplies power to each sensor from the receiver through a pair of signal lines, and polls each sensor from the receiver to fire in a predetermined monitoring period. In a self-fire alarm system that sends back data, a type output unit that inputs a type signal of a level according to the type of detector to the A / D conversion unit for a certain period from the rise of power supply The receiver is equipped with a type detection unit that detects the type data returned as data, and the type output unit of the sensor is the analog fire signal in the normal state and the analog fire signal in the normal state. It is equipped with a selection circuit that compares the level with the type signal set to a higher level and selects and outputs the signal with the higher level, and receives the type data as fire data when the power is turned on. Since the data is returned to the machine, there is an effect that the number of bits of fire data is not restricted by the return of the type data.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and (b) are block circuit diagrams of essential parts of an embodiment of the present invention, FIG. 2 is an operation explanatory diagram of the same as above, and FIG. FIG. 4 is a schematic configuration diagram of the fire alarm system, and FIG. 1,1 _1, 1 _2, 1 ₃ ...... is detector, 2 a receiver, 3 signal lines, 12
Is an A / D conversion unit, 14 is a type output unit, 21 is a type detection unit, and 24 is an operation test unit.

Claims (1)

(57) [Claims] Consists of multiple detectors equipped with an A / D converter that converts analog fire signals output from a fire sensor that detects heat, smoke, etc., into fire data, and a receiver that centrally monitors the multiple detectors. In a self-ignition report system that supplies power to each sensor from the receiver via a pair of signal lines, and polls each sensor from the receiver to send back fire data during a predetermined monitoring period, A type output unit that inputs a type signal of a level according to the type of the detector to the A / D conversion unit for a certain period from the rise of the power source is installed in the detector, and a type detection unit that detects the type data returned as fire data Is provided in the receiver, and the type output unit of the detector includes an analog fire signal in a normal state and a type signal set to a higher level than the analog fire signal in a normal state. Deer warning systems, characterized in that comparing the level comprises a selection circuit for selecting and outputting a signal having a higher or level. 2. The receiver is provided with an operation test unit that appropriately operates the type output unit and the type detection unit to check the operation of the sensor depending on whether the type detection result of the sensor is a predetermined type or not. The self-fire alarm system according to claim 1.