JPH0786956B2 - Surveillance alarm - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire monitoring device and the like, and more particularly to an auxiliary device for detecting a unique address for enabling a receiver to identify an operating sensor. Is.

[Prior Art] Conventionally, a fire alarm device has a receiver, a pair of sensing lines extending from the receiver to each warning area, and a low impedance when a fire phenomenon is detected, which is connected between the sensing lines. Some of them consist of a fire detector that conducts at. In general, a plurality of fire detectors are connected in parallel between a pair of sensing lines. Therefore, when the fire detector operates, the receiver cannot identify which fire detector has operated. Therefore, an auxiliary device (adapter) that can identify each unique address is connected to the fire detector, and when the fire detector is operating, the unique signal from the receiver is detected and a response signal is output, or the unique signal is output. There is a fire alarm device that identifies and displays the fire detector operated by the receiver. For example, Japanese Utility Model Publication No. 56-77992 [Fire alarm device]
There is.

[Problems to be Solved by the Invention] A fire detector that operates by outputting a unique signal only when the fire detector operates with a simple circuit accessory circuit (adapter) that is not the constant call response method (polling method) In the system that identifies, the only way to check whether the function of the adapter is normal during normal monitoring is to test the sensor to check it, and it took time to check the function.

[Means for Solving the Problems] The alarm monitoring device of the present invention includes a plurality of sensors for conducting a pair of sensing lines for power supply / signal with low impedance when a fire phenomenon is detected, and the pair of sensing lines. A receiver that sequentially starts sending an address signal when an operating current of the sensor is detected through the alarm to issue an alarm, and a receiver that is provided corresponding to the plurality of sensors and receives the address signal from the receiver. ,
An auxiliary device that outputs a return signal when it matches the unique address set for itself, and when the sensor operates, the auxiliary device is set to the operating state to identify the sensor operating on the receiver side. In the monitor and alarm device capable of displaying, when the function of the auxiliary device is checked, the receiver supplies power by reversing the polarity of the power supplied to the pair of sensing lines or changing the voltage. After changing the conditions, address signals are sequentially transmitted to the sensing lines, the power supply conditions supplied to the pair of sensing lines are converted to the accessory device, and the connection state with the sensor is normal. It is equipped with a means to be in operation at a certain time, receives an address signal from the receiver, outputs a return signal to the sensing line when it matches with its own unique address, and outputs all signals from the receiver. It is characterized in that to allow the functional check of the serial accessory.

[Operation] The function of the auxiliary device can be checked from the receiver side without operating the sensor.

[Embodiment] An embodiment of the monitoring and warning device of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing the whole monitoring and warning device of the present invention. This monitor / alarm device includes a receiver 1, a pair of sensing lines 2 and 2'extending from the receiver 1, a plurality of accessory devices 3 connected between the pair of sensing lines 2 and 2 ', and respective accessories. And a plurality of sensors 4 connected via the device 3.

First, the monitoring operation of the monitoring and alarm device thus configured will be described. Normally, a positive voltage of DC is supplied from the receiver 1 to the sensing line 2 and a negative voltage is supplied to the sensing line 2 '. This power supply voltage is supplied to the sensor 4 via the accessory device 3. When the detection level of heat, smoke, gas, etc. is above a predetermined level, the sensor 4 conducts with low impedance between the electrodes connected to the terminals TC, TD, TE of the accessory device 3. Sensor 4
Is operated, the accessory device 3 is supplied with power to the sensor 4 through a predetermined impedance so that a voltage remains between the sensing lines 2 and 2 '. Then, the accessory device 3 is activated by using the remaining voltage as a power source. When the receiver 1 detects the operating current of the sensor 4, the receiver 1 sequentially outputs an address signal as a pulse signal between the sensing lines 2 and 2 '. The accessory device 3 in the operating state receives the pulse signal and outputs a response signal when the set number of unique pulses is reached.
The receiver 1 identifies the operated sensor 4 from the number of pulses when the response signal is detected, displays it, and gives an alarm.

Next, the function check of each accessory device 3 will be described. When the function check of the auxiliary device 3 is performed, the receiver 1 converts the polarities of the sensing lines 2 and 2'and uses the remaining voltage when the sensor 4 operates. Then, the same pulse signal as when the sensor 4 is operating is output. When the polarity of the power source is changed, the accessory device 3 enters the same operating state as when the sensor 4 operates, receives a pulse signal, and outputs a response signal when the number of unique pulses set for itself is reached. Therefore, the receiver 1 can check the functions of all the auxiliary devices 3 by sequentially receiving the response signals from the auxiliary devices 3. Further, since the electrodes connected to the terminals TD and TE are connected inside the sensor 4, if the sensor 4 is not connected, the accessory device 3 is not supplied with power and the sensor 4 is dropped. It has also detected.

The timing chart shown in FIG. 3 shows the signal state (b) between the sensing lines 2 and 2'when the sensor 4 is operating and the signal state (a) at the time of function check.

Next, a specific example of the accessory device 3 will be described based on the block circuit diagram shown in FIG. This accessory 3 is
From the counter 30, a magnitude comparator 31 that compares the count value of the counter 30 with a predetermined count value, and outputs a match signal when they match, a setting address device 32 that sets the number of unique pulses of its own, and a receiver 1 Start pulse detection circuit that detects the start pulse of the signal pulse sent
33, a clock pulse detection circuit 34 that detects a clock pulse of a signal pulse, transistors Q1, Q2, and a diode
D1 to D7, capacitors C1 and C2, and resistors R1 to R4. As shown in FIG. 1, the terminal TA is connected to the sensing line 2 and the terminal TB is connected to the sensing line 2 '. Terminal T
C, TD, TE are connected to the sensor 4, and terminal TD and terminal TE
Are connected inside the sensor 4.

The operation of the accessory device 3 thus configured will be described.
At the time of normal monitoring, a predetermined voltage (+ 24V) is applied to the terminal TA. This power supply voltage is supplied to the sensor 4 via the resistor R1. Since the sensor 4 at the time of monitoring has a high impedance, only a small current flows. Transistor Q1 is off and therefore each circuit 30
~ 34 is not powered. When the sensor 4 operates and enters a low impedance state, a voltage drop occurs in the resistor R1 and the transistor Q1 becomes conductive (ON). The power from the sensing line 2 is charged into the capacitor C1 via the transistor Q1 and the diodes D1 and D5 and is also supplied to the circuits 30 to 34. On the other hand, when the receiver 1 detects the operating current of the sensor 4 on the sensing lines 2 and 2 ', it outputs a pulse signal to the sensing lines 2 and 2'as shown in the timing chart of FIG. This pulse signal is formed of a start pulse and a clock pulse. This pulse signal is supplied to the start pulse detection circuit 33 and the clock pulse detection circuit 34 via the transistor Q1 and the diode D1. The start pulse detection circuit 33 outputs a detection signal to the counter 30 when detecting a start pulse longer than the clock pulse. The counter 30 is reset by the detection signal from the start pulse detection circuit 33 and counts the clock pulses detected by the clock pulse detection circuit 34. The counter 30 applies an output indicating the count value to the magnitude comparator 31. The magnitude comparator 31 compares the unique count value set in the address setter 32 with the count output of the counter 30 and outputs a match signal when they match. The match signal of the magnitude comparator 31 is supplied to the base of the transistor Q2 via the capacitor C2. Transistor Q2 is a capacitor due to the match signal
It is turned on for a predetermined time by a differentiating circuit composed of C2 and resistor R4. Therefore, the sensing lines 2 and 2'are electrically connected through the circuit of the diode D6, the transistor Q2 and the diode D2.
This is the return signal shown in FIG. As shown here, even if the clock pulse rises, the sensing line 2,
Since it is at the low level during 2 ', the receiver 1 detects this state and identifies the return signal. Upon detecting the return signal, the receiver 1 identifies the operated sensor 4 from the number of clock pulses up to this time, displays this, and issues an alarm. When the receiver 1 detects the return signal, it delays the sending of the next clock pulse by the time of the return signal.
This does not affect even if there are other auxiliary devices 3 that are operating at the same time, and all of the sensors 4 that are operating by sending one pulse signal (start pulse, clock pulse) I am trying to identify them.

When performing the function check of the accessory device 3, the receiver 1 converts the polarities of the sensing lines 2 and 2 '. When a negative voltage is applied to the terminal TA and a positive voltage is applied to the terminal TB (TD), the positive voltage of the terminal TD is passed through the diodes D3 and D5, and the negative voltage of the terminal TA is passed through the diode D4. ~
It is supplied to 34 and all the auxiliary devices 3 are activated. Then, each auxiliary device 3 receives the pulse signal continuously output from the receiver 1, and when the number of unique pulses is reached, the diode 3
Sense line 2 through D7, transistor Q2, diode D4,
By making the 2'conducting, the return signals are sequentially output. From this return signal, it can be checked that the function of each accessory device 3 is normal (including the connection state of the sensor 4). At this time, the power source is reversely connected to each sensor 4, but there is no fear of damage because a diode or the like for preventing backflow is connected. Further, this function check is performed manually at the time of inspection or automatically at every predetermined time, and an alarm is issued when there is an abnormality. While each sensor 4 is in the non-monitoring state during the function check, the function check can be checked in a short time by sending a series of pulse signals from the receiver 1, and when the function check is completed, the monitor state is immediately entered. It has almost no effect on operation.

In this embodiment, the function check is performed by converting the polarities of the sensing lines 2 and 2 ', but the present invention is not limited to this method. For example, a transistor
A Zener diode is connected in parallel between the emitter and collector of Q1, and the power supply voltage (eg 24V) supplied from the sensing lines 2 and 2 ′ does not exceed the Zener voltage (eg 28V) under normal monitoring conditions. Choose. Then, at the time of function check, if the power supply voltage is set to a value higher than the Zener voltage (for example, 23V), the power is supplied to all the accessory devices 3, so that the function check of all the accessory devices is possible. In this case, the alarm of the sensor 4 can be known even during the function check.

[Effects of the Invention] As described above, the monitoring / alarm device of the present invention is activated by the operation of the sensor, and the detector is operated by the auxiliary device for identifying the sensor operated on the receiver side. It is possible to check the functions of all the auxiliary devices from the receiver side without having to do so, and at the same time, it is possible to detect the dropout of the sensor. Further, since this functional test (check) is carried out periodically with a relatively long cycle, it can be carried out with little influence on the normal monitoring operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a monitoring and alarm device of the present invention, FIG. 2 is a block diagram showing an embodiment of an accessory device of the device, and FIGS. 3 and 4 show the operation of the device. It is a timing chart for explaining. 1 ... Receiver, 2, 2 '... Sensing line, 3 ... Auxiliary device,
4 …… Sensor, 30 …… Counter, 31 …… Magnitude comparator, 32 …… Address setter, 33 …… Start pulse detection circuit, 34 …… Clock pulse detection circuit, Q1,
Q2 ... Transistor, D1-D7 ... Diode, R1-R4 ...
… Resistors, C1, C2… Capacitors. TA, TB, TC, TD, TE ...
… Terminal.

Claims (1)

[Claims] 1. A plurality of sensors for conducting a pair of sensing lines for power supply and signal at low impedance when a fire phenomenon is detected, and an operating current of the sensor is detected through the pair of sensing lines. Sometimes a receiver that sequentially starts sending address signals and gives an alarm and is provided corresponding to the above multiple sensors, receives the address signal from the receiver, and when it matches the unique address set for itself A monitoring and alarm device comprising: an accessory device for outputting a return signal, wherein the accessory device is in an operating state when the sensor is in operation, and the sensor operating on the receiver side can be identified and displayed. The receiver reverses the polarity of the power supplied to the pair of sensing lines when checking the function of the accessory device, or
Alternatively, after changing the power supply condition by changing the voltage, the address signal is sequentially transmitted to the sensing line, and the power supply condition supplied to the pair of sensing lines is converted to the accessory device, It is provided with a means for operating when the connection state with the sensor is normal, receives an address signal from the receiver, and outputs a return signal to the sensing line when it matches with its own unique address, A monitoring and alarm device characterized in that the functions of all the above-mentioned auxiliary devices can be checked from the above-mentioned receiver.