SU760148A1 - Centralized observation system fire alarm - Google Patents

Description

The invention relates to fire alarm technology and can be used as an object device in centralized monitoring systems using subscriber telephone communication lines.

A fire alarm device is known which includes a switch, an encoder, a display unit, a driver, an AC switch, a rectifier, a DC switch, a converter, and a signal circuit Sch.

It is known a fire alarm-fire device for centralized surveillance systems contains an AC switch, the output of which is connected in series with the voltage converter through a rectifier and a DC switch, the input of the first driver of signals through a rectifier and a switch is connected to the converter output, and This driver is connected to the autonomous telephone line, the input of the second driver is connected to the signal circuit, and the output of the converter through the switch is connected to the signal circuit and, the output of the converter through ne

2

The switch is connected to the subscriber's telephone line.

Such a device provides monitoring of security and fire alarm sensors, galvanic isolation of the signal circuit and telephone line. , automating the process of disarming an object and taking an object under protection and issuing relevant notifications to the central monitoring system, as well as generating a “object arming” signal only when the signal circuit is in good condition.

However, this device has the following disadvantages; The signal of a fire is generated by a short circuit. subscriber telephone line, which can lead to false signals of a fire as a result of accidental closure of the subscriber telephone line when. carrying out maintenance work on the PBX; does not allow for the protection of objects with paired or connected in parallel · telephones; does not provide round-the-clock protection of the facility with constant monitoring of the subscriber line

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subject to telephone preservation.

In addition, the ground signal is used as the Third Wire to form the “take-up” signal, which reduces the noise immunity of the centralized surveillance system and introduces additional interference to the PBX equipment.

The closest to (the technical solution of the invention is a fire alarm device for centralized monitoring systems, containing a generator, an encoder, a switch connected to an alarm unit, an amplifier connecting unit at the input of a fire and safety signal circuit (2).

The specified device fire alarm for centralized surveillance systems contains fire and burglar alarm circuits connected to the first input of the signal conditioner, the output of which is connected to the switch, in the signal conditioner, the output of the first transistor switch is connected to the first input. the multivibrator house and the input of the second transistor switch, the output of which is connected to the second input of the multivibrator, the output of the multivibrator is connected to the anode of the diode, the cathode of which is connected to the first input of the OR element, the output of which is connected to the switch. In this case, the fire signal circuit is connected to the input of the first transistor driver key, the encoder is connected to the input of the second transistor driver key, the inputs of the generator and the alarm unit are connected to a switch, and the generator output is connected to an amplifier whose output is connected to the subscriber's telephone line .

Danyo..device provides round-the-clock protection of objects with individual, paired or connected in parallel telephone sets, while maintaining telephone communications; continuous monitoring of subscriber line health and device operability; automating the process of taking an object under protection and disarming it, as well as monitoring the breaking of the security and fire alarm chains.

The disadvantages of this device are that it does not provide control of the fire and security signal circuits for a short circuit, which can be used, for example, to penetrate a guarded object. In addition, it gives the same signal to the centralized monitoring system in night mode and day guard mode (continuous).

dug frequency), i.e. There is no difference in the signals of the security modes. Therefore, if the materially responsible person of the object accidentally or intentionally leaves the device on for the night on in daytime security mode, the object will remain unguarded.

The purpose of the invention is to increase the reliability of the device by providing additional control of the fire and burglar alarm circuits and generating a signal in the daily protection mode, different from the signal when the device is in night protection mode.

This goal is achieved by the fact that the device entered control units, a frequency divider, elements AND-NOT, the control unit and the decoder, the first input of the control unit and the first input of the first element AND-NOT connected to the switch, the first output of the control unit connected to the input of the amplifier, the second is with the first input of the second 'NAND element, the generator output is connected to the second input of the control unit and the input of the frequency divider, one output of which is connected to the first input of the alarm unit, and the other outputs, respectively, through the first,. . the second and third elements of the AND-HED are connected to the third, fourth and fifth inputs of the control unit, the fire alarm circuit is connected to the input of the third element nd-HED and the second input of the alarm unit through the first control unit. The first signal circuit through the second control unit is connected to the sixth input of the control unit, and the third input of the signaling unit, the fourth input of which is connected to the first output of the encoder, the second output of the encoder is connected to the seventh input of the control unit, the eighth input of which is connected to the second signal circuit, the output of the decoder connected to the input of the encoder.

. FIG. ί presents the functional diagram of the device; in fig. 2 a-e schematically show the signals emitted by the device.

The device includes a generator 1, a torus 1, an encoder 2, a switch 3, an alarm unit 4, a subscriber telephone connection unit 5, an amplifier 6, a fire alarm circuit 7, an alarm circuit 8 · and 9, and control nodes 10 and 11 , divider 12 frequencies, elements AND-NOT 13-15 and control block 16.

The generator 1 is designed to issue signals to the frequency divider 12 and the control unit 16, which from block 16 is fed to the amplifier 6, and the output of the amplifier 6 through the connection unit 5 is from the subscriber telephone communication line 17. The control unit 16 is assembled on the triggers, elements NAND and NOR. Nodes 10, 11 control implementations 5 760148 6

control signal circuits for open and short circuit. They are collected on the threshold elements and transistor keys. Divider 12 frequencies and elements AND-NOT 13-15 are designed to generate signals "fire", 5 "change of protection mode" and "day protection". The alarm unit 4 switches on the lights, indicators (lamps) 18 and bell 19. The device provides round-the-clock protection of the facility and operates in two modes - in the night and day guard mode.

For the organization of night protection, the materially responsible person on the encoder 2 sets a certain code, and the switch 3 switches to the "night protection" position. From switch 3 to the first input of the element IS-NOT 13, a logical “0" signal is received, which prohibits the passage of pulses from the frequency divider 12 through this element. At the output of the element IS-NOT 13, a signal "1" is present, which goes to input of control unit 16. The signal "log 0" from switch 3 also enters the input of block 16, which causes the output of signal "1" at its output, connected to the input of element AND-HE 14. In this case, the output of element AND-NOT 14. Positive “1” pulses with a duration ι and a repetition period of 8 появляются appear. H and the outputs of the elements AND-NOT 15 and AND-NOT 13 at this time there are signals "1", as at the first input of the element, 35

AND-NOT 15 receives the prohibition signal "O" from the node 10 of the control, and the first input of the element AND-NOT 13 - from the switch

3. Pulses from the NANDI element 14 are fed to the input of the control unit Ϊ6, deciding the passage of the signal from the oscillator 1 to the amplifier 6.

During the pause, i.e. within 7ί from the element I-NOT 14, the input "block 16" receives a signal "0", which prevents the passage of the signal to the amplifier from generator 1. At the output of amplifier 6, frequency bursts of duration ι and repetition period 8 appear, which through The connection unit 5 enters the subscriber telephone line 17, and the subscriber line arrives at the centralized surveillance system, signaling to the operator that the object has changed state of the object, but the object is not yet guarded. The signal emitted by the device to the subscriber line 17 when the state of the object changes, is shown in FIG. 2a

The responsible person 60 leaves the facility, presses the “reset” button of the decoder 20, and from the encoder 2, the signaling unit 4 receives a signal to turn on the remote signal lamp 18, which is lit by 65

light if the security alarm circuit 8 is good. The control unit 16 from the encoder 2 receives the signal "1", which, at the output of the control unit connected to the NAND 14 element, causes the appearance of the signal "0". This signal prevents the passage of pulses from the divider 12 frequency through the element AND NOT 14 to the control unit and further to the subscriber line. At the output of the element AND-NOT 14, the signal "1" is present, since the output of the elements IS-NOT 13-15 contains the signal "1", the signal of the generator 1 through the control unit is continuously fed to the input of the amplifier 6, and its output through the unit 5 connections - to the subscriber's telephone line 17. The signal emitted by the device to the subscriber's telephone line is shown nafig in the night guard mode. 2 b.

From the communication line, a continuous frequency signal arrives at the centralized surveillance system, signaling to the operator that the device is in night guard mode and the object is being guarded. Thus, in the night guard mode, the device is turned off; gives on. centralized monitoring system continuous. frequency signal. When a security object penetrates the protected object, the security alarm circuit 8 is violated and a signal is transmitted from the monitoring unit 11 to the block 16, which prohibits the signal from the generator 1 to the amplifier 6. The frequency signal in the subscriber line 17 will disappear (Fig. 2b) and, therefore, the flow signal and to the central monitoring system, which will generate an “alarm” signal. The signaling unit 4 from the control unit 11 receives a signal to turn on the light indicator 18 and the bell 19. The light indicator 18 turns on and off in time with the pulses coming to the unit 4 from the frequency divider 12, producing an intermittent light signal.

In the event of a fire at the facility, one of the fire detectors included in the 7. fire alarm circuit triggers.

From the node 10 of the control element I-NOT 15 receives the enable signal "1" on, passing pulses from divider 12 to block 16 through this element. From the output of the element IS-NOT 15, block 16 receives positive pulses "1" with duration and period follow 4 ι. During the pulse, the signal from the generator 1 through the control unit 16 is fed to the amplifier 6 and further to the subscriber telephone line 17,

During the pause, i.e. during 31c of the element AND-NOT 15, the signal "0" is received at the input of block 16, which prohibits the passage of the signal from generator 1 through block 16. At this time

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The arrival of the frequency into the subscriber telephone line 17 is stopped. The signal emitted by the device from subscriber line 17 in the event of a fire at the facility is shown in FIG. 2g. The system of centralized monitoring ~ from line 17 will receive frequency bursts of duration ι and a repetition period of 4 ι, which, in turn, will generate a “fire” signal. On the block '4 ^gya Ш1 * ЫЗЛЫз ^, actions from the node 10 of control in case of violations of the fire alarm circuit, there is a signal to turn on the light and sound alarm (18 and 19).

Before entering the object, the materially responsible person dials the necessary code on the decoder 20 and enters the object. In this case, signals are sent from the encoder 2 and the control unit 11 to the control unit, which cause the signal "1" to appear at its output, connected to the first input of the NES 14 element. At the output of the I-EE 14 ^ element, there appear positive pulses of duration ι and a repetition period of 8 ι, arriving at the AND-HE element 14 from the divider .12 frequencies. From the output of the element AND-NOT 14 pulses arrive at the input of the control unit 16, allowing the signal to pass from the generator 1 to the amplifier 6. during a pause, i.e. within 7 I, the I-N-14 element to the input of the control unit receives a “log 0” signal, which prohibits the passage of the signal from the generator 1 to the amplifier b.

At the output of the amplifier b, frequency bursts of length ι appear with a repetition period of 8. Through the connection unit 5, the frequency parcels arrive at the subscriber telephone line 17, and from the line to the centralized monitoring system, signaling to the operator that the facility will be changed by the materially responsible person. The signal emitted by the device in this case is shown in FIG. 2a The light and sound alarms at the facility will not turn on, since from the encoder 2 the alarm block 4 will receive a signal prohibiting the activation of the light and sound alarms (18 and 1) 9). If on the decoder 20 the code doesn’t have been dialed incorrectly, then when entering the object from the node 11 of the controller, block 16 will receive a signal that prohibits the signal from generator 1 to amplifier 6. The frequency signal in the subscriber line 17 and the central monitoring system will issue alarm signal. From node 11 of the control unit 4 will receive a signal permission to turn on the light and

sound alarm (18 and 19).

To organize day guard switch 3 devices translate

in the "day guard" position. At the output of block 16 connected to the input

-20

ten

15

25

thirty

35

40

45

50

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element AND NOT 14, the signal "0", which prohibits the passage of pulses through this element from the divider 12 frequency. At the first input of the element IS-NOT 13, the signal "log 1" is received, which allows the pulses from divider 12 to pass through this element. Positive pulses of duration ι and a repetition period of 16 появляются appear at the output of the element AND-NOT 13 unit 16 controls and prohibit the passage of a signal from generator 1 to amplifier 6.

During a pause (within 15 s), an “0” signal is sent from the NAND 13 element to the input of block 16, allowing the signal from generator 1 to be transmitted to amplifier 6, at the output of which frequency bursts of 15 ι appear with a repetition period of 16 ι. Through the connecting unit 5, the frequency parcels are sent to the subscriber telephone line 17, and from the line to the centralized surveillance system, signaling to the operator that the device has been switched to day-guard mode. The signal issued by the device in. subscriber line in daytime security mode, shown in FIG. 2d

From switch 3 to the alarm unit in this mode, a signal "log 0" is received, prohibiting the switching on of the remote signal lamp 18 and bell 19. Thus, in the "day guard" mode, the device enters the frequency surveillance system with a duration of 15 ι and a repetition period in the central monitoring system 16 ί, and in the "night protection" mode - a continuous frequency signal.

If an object is attacked in the daytime, the facility’s personnel simply press the button included in the signal circuit 9. A signal “0” will be sent to the input of block 16 from the output of security alarm 9, which prohibits the passage of a signal from generator 1 to amplifier 6, despite the fact that the pulses from the element AND NOT 13 to the input of the control unit 16 continue to flow. Frequency parcels with a duration of 15 .1 and a period of 16 ι will not be received by the subscriber’s telephone line 17 and the central monitoring system will generate an “alarm” signal. A signal about a fire at an object during the daytime will be transmitted in the same way as a signal about a fire when the object is in night guard mode.

Thus, the introduction of control nodes into the device allows monitoring of the fire and burglar alarm circuits for both an open circuit and a short circuit. Introduction to the device of frequency divider, elements of NAND and control unit

9

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enables the device to issue a signal other than a signal issued in the night protection mode to the centralized monitoring system during day protection. From these signals, the operator knows in which protection mode the device installed at the facility is turned on.

Claims (1)

Claim Fire alarm device for centralized monitoring systems, containing a generator, encoder, a switch connected to the alarm unit, an amplifier, the output of which is connected to the input of the subscriber telephone line connection unit of the fire and burglar alarm circuit, characterized in that devices, control nodes, a frequency divider, NAND elements, a control unit and a decoder, the first input of the control unit and the first input of the first NID element are connected to the switch STUDIO, the first control unit outputs are connected to the amplifier input, the second - to the first input of the second element AND-NOT, the generator output is connected to the second input of the control unit and the input of the frequency divider, one output of which is connected to the first input of the alarm unit, and the other outputs through the first, second and third elements are NOT connected to the third, fourth and to the fifth inputs of the control unit, the fire alarm circuit is connected to the input of the third NAND element through the first monitoring unit and to the second input of the alarm unit; the first alarm circuit is connected to the sixth input of the control unit through the second monitoring unit and the third input of the signaling unit, the fourth input of which is connected to the first output of the encoder, the second output of the encoder is connected to the seventh input of the control unit, the eighth input of which is connected to the second circuit 20 security alarm, the output of the decoder is connected to the input of the encoder. .