JPH081676B2 - Fire alarm - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fire alarm device, and more particularly to an analog fire detector that can be tested from a receiver.

[Prior Art] Conventionally, as disclosed in JP-A-59-47694, "Sensor test circuit of alarm device", smoke concentration, gas concentration,
In an alarm device that calls a plurality of terminals (sensors) with sensors that output analog output values corresponding to temperature etc. from the receiver by address and returns the detected analog value, from the receiver There has been proposed a device that sends a test command, the terminal device that receives the test command generates a test voltage and supplies the test voltage to the sensor portion, and tests the terminal device from the returned data at this time.

[Problems to be Solved by the Invention] A test voltage generating circuit of a sensor test circuit disclosed in Japanese Patent Laid-Open No. 59-47694 generates a constant test voltage or a test voltage of a level according to a test command signal. Then, it is supplied to the sensor and tested. Unlike on / off type fire detectors, which output an operation signal when the detection level reaches a certain threshold or higher, analog type fire detectors generally use the return data for the test voltage to determine the operating characteristics, sensitivity, etc. of the sensor from the receiver. You can check on the side. For this reason, it is necessary to return a plurality of data of the detection unit by the variable test voltage corresponding to covering the entire measurement range of the sensor.

Therefore, if a large number of test command types are required, or if a test voltage generation circuit that automatically generates test voltages in multiple stages is used, the timing at which detection data is requested from the receiver becomes a problem. Become.

[Means for Solving the Problem] In the fire alarm device of the present invention, a plurality of analog fire detectors each having a unique address are connected to the same transmission line, and a reception connected to one end of the transmission line. The analog fire detector, which is called by the address signal, sends an analog signal from the machine, and the analog fire detector in the fire alarm device is configured to return the detected analog data such as smoke density and temperature detected by the detector. The address comparator outputs an address match signal when it receives the address signal sent from the receiver and matches the unique address set in the address setter, and outputs the address match signal. Based on the above, the command identification that receives the command signal from the receiver and outputs the test control signal when the command type is the test command Another circuit,
A counting circuit such as a shift register that counts the test command sending circuit from the receiver from the number of times the command control circuit outputs the test control signal, and a different test voltage corresponding to the count value of the counting circuit is generated. And a test voltage generation circuit applied to the detection unit, the receiver sends an address signal and a test command signal to issue a test command to the specific analog fire detector, depending on the number of times the test command is sent. The test of the analog fire detector is performed from the analog data returned based on different test voltages.

[Operation] The same test command command can be sent, and different test voltages can be generated from the number of times this command is sent.
The detection data returned at this time can be processed as test data.

[Embodiment] An embodiment of the fire alarm device of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the entire fire alarm device of the present invention. This fire alarm device is composed of a fire receiver 1, a transmission line 2 extending from the receiver 1, and a plurality of analog fire detectors 3 connected to the transmission line 2.

The receiver 1 is a central processing unit 10 such as a microprocessor.
And a storage device 11 in which programs, data, etc. are stored,
Interfaces 12, 13 connected to the central processing unit 10
And a transmission unit 14 connected to the interface 12 for transmitting and receiving signals to and from each fire detector 3, and an interface 13
Display unit 15 that is connected to and displays various types of information such as fire alarms.
And an operation unit 16 which is connected to the interface 13 and performs various operation inputs.

The operation of the fire alarm device thus configured will be described. Normally, the central processing unit 10 of the receiver 1 executes the monitoring processing program stored in the storage device 11. Then, the central processing unit 10 supplies an address and a command signal to the transmission unit 14 via the interface 12, and the transmission unit 14 parallel-serial converts the address and the command signal at a predetermined timing and outputs them to the transmission line 2. . The command at the time of monitoring is data collection. Each analog fire detector 3 receives the call signal from the receiver 1, and the detector 3 whose reception address matches its own unique address detects the temperature of the detected fire site.
Performs the operation of returning analog data indicating smoke density, etc. The receiver 1 sequentially cyclically calls the sensors 3 to collect detected analog data and monitor fires. When the analog amount indicated by the data returned from the sensor 3 exceeds a predetermined value, the receiver 1 judges that there is an abnormality when the amount of change exceeds a predetermined value, and drives the display unit 15 to display a fire alarm. .

When testing the operating characteristics of each fire detector 3,
A test start operation is input from the operation unit 16. With this operation input, the central processing unit 10 makes the command for calling the sensor 3 a test command. Sensor 3 that received the test order
Supplies the detection part that operates the test voltage generation circuit to detect a fire phenomenon. Then, the sensor 3 returns the detected analog data at this time. When the test voltage generation circuit of the sensor 3 continuously receives the test command, the test voltage becomes different each time the command is received, so that the output data at each level of the detection unit is obtained, and the operating characteristics, the sensitivity, etc. are measured. be able to.

Next, one embodiment of the analog fire detector 3 will be described with reference to the block diagram shown in FIG.

The sensor 3 includes a transmission circuit 30 that transmits and receives signals to and from the receiver 1, an address setter 31 that sets a unique address, an address signal received by the transmission circuit 30, and a unique address of the address setting 31. An address comparator 32 that compares and outputs an address match signal when they match, and a transmission circuit 30
The command discriminating circuit 33 that analyzes the type of the command signal received by the device when there is an address coincidence signal, the shift register 37 that counts the number of arrivals of the test control signal (pulse) from the command discriminating circuit 33, and the shift register 37. Test voltage generation circuit that generates different test voltages based on numerical values 38
A detection unit 36 that detects heat and smoke of a fire phenomenon and outputs a detection analog signal, an amplifier 35 that amplifies the analog signal of the detection unit 36, and an A that converts the analog output of the amplifier 35 into a digital signal. It is composed of an / D converter 34, an AND circuit AND and a NOT circuit NOT for obtaining the reset signal of the shift register 37 from the address coincidence signal and the test control signal.

The operation of the sensor 3 configured as above will be described below.
The transmission circuit 30 is normally in a reception state, receives a calling signal from the receiver 1, and outputs an address signal to the address comparator 32. The address comparator 32 compares with the unique address set by the address setter 31, and if they match, outputs an address match signal to the command identification circuit 33 and the AND circuit AND. When the address identification signal is input, the command identification circuit 33 analyzes the command signal received by the transmission circuit 30. When the command type is data collection, the control signal is not output. When the command type is the test command, the test control signal is output to the shift register 37. The shift register 37 sequentially outputs an “H” signal to a plurality of output terminals each time the test control signal is output from the command identification circuit 33. Further, when the address match signal is output and the command control circuit 33 does not output the test control signal at this time, the reset signal is supplied from the AND circuit AND to the reset terminal of the shift register 37, and the shift register 37 is reset (cleared). . During normal monitoring, the output terminals of the shift register 37 are all "L", and the test voltage generating circuit 38 is not operating.

On the other hand, the detection unit 36 constantly detects the temperature of a fire phenomenon, smoke density, etc., and the detection signal is amplified by the amplifier 35 and output to the A / D converter 34. When the operation signal from the command identification circuit 33 or the address coincidence signal is output, the A / D converter 34 converts the analog output of the amplifier 35 into a digital signal and supplies it to the transmission circuit 30. The transmission circuit 30 parallel-serial converts this digital signal and outputs it to the transmission line 2 at a predetermined timing.

During normal monitoring, that is, when the command from the receiver 1 is data collection, the measurement data of the detection unit 36 is returned. When the command is a test command, the signal of "H" is output to the output terminal of the shift register 37, but when the test commands are continuously transmitted, the signal is output in a counted form. When a signal indicating the count value is output from the shift register 37, the test voltage circuit 38 generates a test voltage corresponding to the signal and outputs the test voltage to the detector 36.
Supply to. That is, when the test command is sent from the receiver 1, the analog data of the detector 36 based on the test voltage is sent back. When a test command is continuously sent from the receiver 1 to the same sensor 3, the detection unit 36 can be measured by a different test voltage for each sending, so that the operating characteristics, sensitivity, etc. can be measured. In addition, if a normal collection command is sent during the test or at the end of the test, it is possible to immediately return to the monitoring state. When a test end command is provided in the command and the shift register 37 is reset by this command, it is not necessary to continuously send the test command, and long-term measurement at a certain test level is possible.

Next, a third specific example of the test voltage generating circuit 38 will be described.
Description will be made based on the circuit diagram shown in the figure.

The test voltage generating circuit 38 is a circuit that generates a test voltage in four stages. This circuit is a 4-bit shift register 37
Of the outputs Q0 to Q3, the diodes D1 to D10 for preventing interference, the transistors T1 to T5, the zener diodes Z1 to Z4, and the resistors R1 to R7. The transistors T1, T3, T4, T5 are used for switching, and the transistor T2 and the resistors R2, R3, R4 form a constant current circuit. In addition, the output terminal OUT is for the test voltage output.
It is connected to the detection unit 36 shown in the figure.

In the shift register 37, every time a test control signal (pulse) is input to the input terminal ID, the "H" signal is sequentially moved and output to the output terminals Q0 to Q3. Further, when the reset signal is applied to the reset terminal, the output terminals Q0 to Q3 become "L". First, the output terminals Q0 to Q3 are all "L", and the input terminals
When the test command signal is input to the ID once, the output terminal Q0 changes from "L" to "H". The output terminal Q0 causes a current to flow to the base of the transistor T1 through the diode D1 and the resistor R1 and is turned on, and the transistor T2 is in a constant current operating state. Further, current is supplied to the bases of the transistors T3 to T5 through the diodes D5 to D7 and the resistors R5 to R7, respectively, and the transistors T3 to T5 are turned on. Therefore, a test voltage that is substantially the same as the Zener voltage of the Zener diode Z1 is output to the output terminal OUT. When a test command signal is further input to the input terminal ID in this state, the output terminal Q0 goes to "L"
Q1 becomes "H". The "H" signal at the output terminal Q1 is transmitted through the diodes D2, D8, D9 and the resistors R1, R6, R7 to the transistors T1, T4,
The base current is supplied to T5, the constant current operation by the transistor T2 is continued, and the transistors T4 and T5 are turned on. Therefore, the test voltage based on the sum of the Zener voltages of the Zener diodes Z1 and Z2 is output to the output terminal OUT. Similarly, when the test command signal is input, the output terminal Q2 of the shift register 37 becomes "H", and the test voltage based on the sum of the Zener voltages of the Zener diodes Z1, Z2, Z3 is output. Further, when the test command signal is further input, the test voltage based on the sum of the Zener voltages of the Zener diodes Z1, Z2, Z3 and Z4 is output. When the test command signals are continuously input in this way, it is possible to generate a test voltage according to the number of inputs.

Next, an example of the processing program executed by the central processing unit 10 of the receiver 1 will be described with reference to the flowchart shown in FIG.

First, in step S01, an initialization routine for clearing the buffer and initializing the input / output device is executed. Step
S02 sets a variable n indicating the address of the sensor to 1. In step S03, it is determined from the test flag whether or not there is a test request for the sensor n. If YES, the process proceeds to step S09, and if NO, the process proceeds to step S04. Step S04 is a main routine for calling a sensor in a normal monitoring processing routine to fetch detection data and performing fire monitoring. Step S09
Detects a test command on sensor n. Step S10 fetches the return data from the sensor n. Step S11 stores the number of test commands and return data. In step S12, it is judged whether or not the number of continuous test command transmissions has reached the final number, and if YES, to step S13, and if NO, step
Go to S05. In step S13, operation characteristics, sensitivity, etc. are calculated from the stored test data, and the calculation result is output to the CRT, printer, etc. A step S14 clears the test flag. In step S05, it is determined whether or not there is a request for testing the sensor X in the operation input. If YES, the process proceeds to step S06, and if NO, the process proceeds to step S07. Step S06 sets a test flag in the buffer corresponding to the sensor X. Step S07 advances the variable n by one step. In step S08, it is determined whether or not the variable n indicating the address exceeds the final address. If YES, the process returns to step S02, and the same process is repeated from the sensor at address 1, and if NO, the process returns to step S03 and has the next address. Move on to sensor processing.

[Effects of the Invention] As described above, the fire alarm device according to the present invention is
The test voltage is determined from the number of test commands sent from the receiver to a certain sensor, and the operating characteristics and sensitivity of the sensor can be obtained from the analog data returned when this test command is sent. It can be removed and false alarms and false alarms can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing the entire fire alarm device of the present invention,
2 is a block diagram showing an embodiment of an analog fire detector of the same device, FIG. 3 is a circuit diagram showing an embodiment of a test voltage generating circuit of the same detector, and FIG. 4 is a center of a receiver. 6 is a flowchart showing an example of a processing program executed by the processing device. 1 ... Receiver, 2 ... Transmission line, 3 ... Analog fire detector, 10 ... Central processing unit, 11 ... Memory device, 12,13
...... Interface, 14 ...... Transmission section, 15 ...... Display section,
16 ... Operating unit, 30 ... Transmission circuit, 31 ... Address setting device, 32 ... Address comparator, 33 ... Command identification circuit,
34 …… A / D converter, 35 …… Amplifier, 36 …… Detector, 37…
… Shift register, 38 …… Test voltage generation circuit, AND ……
AND circuit, NOT …… not circuit, D1 to D10 …… diode, R1 to R7 …… resistor, T1 to T5 …… transistor, Z1 to Z4
...... Zener diode.

Claims (1)

[Claims] 1. A plurality of analog fire detectors, each having a unique address, are connected to the same transmission line, and an address signal is transmitted from a receiver connected to one end of the transmission line. The analog fire sensor called up in the above is a fire alarm device configured to return the detected analog data such as smoke density, temperature, etc. detected by the detection unit. Address comparator which outputs an address match signal when the received address signal matches the unique address set in the address setter, and a command signal from the receiver based on the output of the address match signal. And a command control circuit that outputs a test control signal when the command type is a test command, and a test control signal of the command control circuit. A counting circuit such as a shift register that counts the number of times a test command is sent from the receiver based on the number of times of output of the receiver, and a test voltage generation that generates different test voltages corresponding to the count value of the counting circuit and applies the test voltage A circuit, the receiver sends an address signal and a test command signal to issue a test command to the specific analog fire detector, and based on a different test voltage depending on the number of times the test command is sent. A fire alarm device, characterized in that the analog fire detector is tested from the returned analog data.