JPH0534720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device for automatic fire alarm equipment.

[Prior Art] A receiver and a plurality of repeaters are connected via a common transmission line, and signals are sent and received by sequentially and cyclically address polling from the receiver using addresses assigned in advance to the repeaters. A system that receives and processes on/off signals from sensors connected to a repeater is known as an R-type system.

Furthermore, in recent years, so-called intelligent sensor systems have been developed that use analog sensors that transmit analog values such as temperature and smoke density associated with fires to receivers, and the receivers process these analog values to issue fire alarms. is being developed. Note that such analog sensors are configured to send an analog quantity to the receiver when address polling is performed by the receiver to which each address is assigned.

Furthermore, when a general on-off type sensor and an analog sensor are used together, they are used as shown in FIG. That is, a transmission line L extends from the receiver 1, and a repeater 3 and an analog sensor 4 are connected to the transmission line L in a mixed manner.

A plurality of on/off type sensors 5 are connected to a line 6 extending from the repeater 3 to the repeater 3. A unique address is assigned to each of the repeater 3 and analog sensor 4, and when address polling is performed by the receiver 1 using a pulse code signal, the repeater 3 returns the operating status of the on/off type sensor 5. The analog value of the analog sensor 4 is sent back to the receiver 1 from the analog sensor 4.

In the receiver 1, the area where the fire occurred and the abnormal condition are identified and calculated from the address code and return signal information, and an alarm is displayed.

[Problems to be Solved by the Invention] In the conventional device as described above, a relay for connecting an on/off type sensor and a dedicated power supply/signal line from the relay are connected to the on/off type sensor. There were problems such as having to wire the wires to the

[Means for Solving the Problems] The present invention includes a plurality of sensors that detect changes in physical phenomena such as fire and gas leaks and perform switching operations, a receiver, and a receiver that extends from the receiver and that detects changes in physical phenomena such as fire and gas leaks. In an alarm monitoring system equipped with a pair of transmission lines that are connected to a power supply and serve as a signal line, a district module with a unique address for each group of sensors is inserted into the transmission line, and each module's electrical The above-mentioned problem is solved by displaying an alarm for each group by calculating the change using a calculating means in the receiver.

[Embodiment] Next, the apparatus of the present invention will be explained in detail based on the drawings showing one embodiment thereof.

Fig. 1 is a circuit block diagram showing the configuration of the device of the present invention, Fig. 3 is a connection diagram of main parts to the transmission line, and Fig. 4 is a circuit block diagram showing the configuration of the device of the present invention.
The figures show examples of circuits for district modules.

As shown in Figure 1, a transmission line L extends from the receiver Re, and fire detectors S are connected to this transmission line L, divided into groups for each fire monitoring district, and a district module is connected to each group. ZI are connected respectively. Groups are set for each fire warning area, each floor of a building, each partition, etc.

The receiver Re includes a transmission circuit 11 that sends and receives signals via a district module ZI and a transmission line L.
, a central processing unit 10 connected to the transmission circuit 11 via an interface I/F, a storage device 13 for storing data or programs, and an operation display section 12.

Sensor S connected between each district module ZI
For example, as shown in FIG. 3, the on/off contact is connected between a pair of transmission lines L via a resistor _R1 . It should be noted that the resistor _R1 may be any other resistor as long as an electrical change can be discerned when the sensor is in operation, and is not limited thereto.

Figure 4 shows an example of the circuit of district module ZI, with a resistor connected in series to either side of the transmission line L.
_R10 and an amplifier 21 that amplifies the voltage across the resistor _R10 , an A/D converter 22 that converts the output of the amplifier 21 into a digital value, and an address setter 23;
It includes a transmission circuit 20 that receives a pulse code from the receiver Re, identifies the address, and returns an A/D converted value to the receiver Re. Diode D and capacitor C are the power supply of district module ZI,
Further, the transistor Tr is an output amplifier of the transmission circuit 20.

The operation in such a configuration will be described below.
Note that the resistances R _i are all set to the same value, and the relationship between the current I _zi consumed by the district module ZI and the current I _a flowing during sensor operation is set in advance so that I _a ≫ I _zi . shall be.

Now, when one of the plurality of sensors S generates an alarm, a slight voltage drop occurs across the resistor _R10 , and this voltage is amplified by the amplifier 21 to a value that is easy to process, and this value is It is converted into a digital value by an A/D converter. When this digital value is address polled from the receiver Re, it is transmitted to the receiver Re via the transmission line L. In the receiver Re, it is possible to identify in which fire monitoring district the sensor S is activated from the address of the district module ZI and the returned data, and an alarm can be displayed.

That is, in Figure 3, a total of n district modules are inserted, and district module ZI ₁
Identification when p sensors are activated on the right side and g sensors on the right side of ZI ₂ is performed as follows.

First, the voltage drop V _zIi at the resistance R ₁₀ of the district module ZI ₁ is: V _zIi = (pI _a + gI _a + (n-1) I _zi ) R ₁₀ ... (1) At the resistance R ₁₀ of the district module ZI ₂ voltage drop
V _vIi+1 becomes V _zIi+1 = (gI _a + (n-2) I _zi R ₁₀ ... (2).

Therefore, by taking this difference inside the receiver Re, the alarm status of the sensor S in the monitoring area of the area module ZI ₁ can be identified. That is, the following equation is derived from equations (1) and (2) above.

V _zIi −V _zIi+1 = (pI _a +I _zi ) R _10Here , as mentioned above, the value of the resistor R _i is set in advance so that I _a ≫I _zi , so V _zIi −V _{zIi +1} ≒ pI _a R ₁₀ .

Therefore, p=V _vIi −V _zIi+1 /I _a R ₁₀ , and the number of p is obtained.

Similarly, the alarm status of the sensor S in the monitoring area of district module ZI ₂ is also changed to the alarm status of the sensor S in the monitoring area of district module ZI ₃ on the right.
It can be distinguished by calculating between the voltage drop of

In this way, the identification of the alarm status of each monitoring area is
This can be done by calculating between it and the voltage drop of the district module on the right.

The calculations between these district modules are as follows:
The central processing unit 10 of the receiver Re processes the data according to a predetermined program and displays an alarm.

In addition, the current I _zi consumed by each district module ZI was set to be extremely smaller than the current consumption I _a due to the operation of the sensor. These values may be measured in advance.

In this embodiment, only general on/off type sensors are connected, but analog sensors with addresses can also be mixed. At this time, the current consumption of the analog sensor is also extremely small compared to the operating current _Ia of the sensor S, so it can be almost ignored.

[Effects of the Invention] By using the district module as described above, the device of the present invention can perform zone monitoring even when a general type on-off type sensor is connected to a pair of transmission lines. It has features such as being able to be used together with analog sensors, etc., and eliminating the need for new branch wiring.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram showing the configuration of the device of the present invention, Fig. 2 is a conventional device, Fig. 3 is a connection diagram of the main parts to the transmission line, and Fig. 4 is a diagram showing an example of the circuit of the district module. It is. L...Transmission line, Re...Receiver, S...Sensor, ZI...District module, 10...Central processing unit, 11, 20...Transmission circuit, R _i , R ₁₀ ...Resistor.

Claims (1)

[Claims] 1. Connected between a receiver and a pair of transmission lines that serve as power supply and signal lines extending from the receiver,
In an alarm monitoring device equipped with a plurality of sensors that generate an electrical change in the transmission line when a change in a physical phenomenon such as a gas leak is detected, each sensor has a unique address, and the receiver receives the address from the receiver. In response to a call specifying , a district module that transmits electrical changes in the transmission line at the insertion site to the receiver as return data is inserted into multiple locations on the transmission line, and the receiver Based on the return data obtained from the modules, a calculating means calculates the difference in electrical changes between the district modules, and from the difference determines the connection point of the sensor that caused the electrical change in the transmission line,
An alarm monitoring device characterized by displaying an alarm.