SU714453A2 - Method of checking the state of sensors - Google Patents

Description

one

The invention relates to the field of automation and remote signaling and can be used in fire and burglar alarm systems, as well as in other areas of control.

According to the main author. St. No. 415687 is known a method of monitoring the state of sensors, for example, an alarm, based on a poll of sensors, on which polling pulses are sent to all sensors simultaneously, the sensor response pulses are shifted by a predetermined time interval and summed, then the first and last response pulses are selected, measuring their time shifts relative to a predetermined time interval and by the magnitude of the sum of their impulses are judged to change the sensitivity of the sensors, their disturbance or their damage (J1).

However, this method does not provide sufficient confidence in the control.

The purpose of the invention is to increase the reliability of the control.

To this end, the system by aut. All Nos. 415687 uses onjjoca bipolar pulses, separate response

impulses of sensors of each polarity and control the presence of each of them.

The invention is illustrated in the drawings.

FIG. 1 shows a block diagram of a device implementing the proposed method; in fig. 2 shows voltage and current plots explaining the proposed method; in fig. 3 shows one of the options for connecting sensors of protection and fire safety; in fig. 4 is a variant of connecting a device for receiving response pulses.

In accordance with the proposed method of monitoring the state of the sensors, the burglar fire stations I are fed from receivers of station 2 by two-pole interrogation pulses via communication line 3. Two-pole interrogation pulses are formed using a forcing 4, for example, a sinusoidal signal generator with a constant generation frequency . The response pulses are received and they are formed into rectangular block 5 reception, response pulses, representing threshold devices having a constant threshold for a negative and positive signal. Rectangular pulses are sent to analy-eatorb, performed on discrete elements fa, KSK and U1 Pulse Length Detector, a pulse arrival detector, and measures their temporal mismatch and Propagate the cc jia-V ss; c jia-V ss; ...-.-, is.-.- нШШШНрес € Ш Т1ствуству11 5 51ЩЩSH (For a negative or positive half-wave, and Shwe pv velichne 1vrShönnbgor sogloyovayi court t about HJTivieTleHHfrMyBCtewteSbHocTH Sensors and give out an alarm by means of an. The polling pulses are fed to the security sensors 7, which transmitting a positive half-wave, and fire safety sensors 8 transmitting a positive half-wave. Negative pulses pass through a resistor 9, forming element 10, which is a diode, contact Security Sensors II, when triggered, the circuit is broken and PloSpire pulses pass through resistors 12, the forming element-diodes 13 and contact sensors fire 66 Ex6 6TH 14, which also break the circuit when sensors are triggered, sum the impulses at the output of the sensors and send them to the threshold devices 15, 16. Threshold devices,% representing diode optocouplers, form rectangular pulses.

A shaper 4, which is a low-frequency generator of sinusoidal signals, sends to polling line 3 (see Fig. 1) a polling signal to the Pack on fire and security loops 1 (see, Fig. 2).

The interrogation signal is received via line 3, to the security sensor 7 and fire safety sensors 8, and the positive half-wave signal passes through a resistor 12, a forming element-diode 13, which is HOTCH; and the negative half-wave passes through the resistor 9, which forms the element-diode 10, which is turned on so that it passes the negative signal, and the contact sensor of the guard 11 (see Fig. 3).

FIG. 2 shows the current form of the interrogation signal that passes through the fire safety sensor 8-current I. And the security sensor 7 is the current 1 .--. ,, Since the security and fire safety sensors are included in the circuit in parallel, the signal of the interrogation of sensors 7, 8 will be SUBSTITUTE, n the form of the current at the input of the receiving unit 5, is similar to the form of the sig sent; questionnaire (see 1 solid line of Fig. 2).

Block T1 reception response pulses 5 is made on two threshold elements (figure 4), which respond to negative and positive signals. In this case, the threshold elements are diode optocouplers, where the optocoupler 15 is passed. The ml of the negative half-wave route and the optocoupler 16 is on the positive half-wave.

The signals at the output of the threshold elements 15, 16 will be in the form of rectangular J pulses, with the pulse duration depending on the amount of current at the input. Square signals come to analyzer 6, which compares the arrival sequence of positive and negative pulses with the pulses sent by the forwarders. When the security sensor 7 is triggered, the circuit for passing the interrogation signal of the negative half wavelength is broken. At the input of the receiving unit 5, there will be a signal of only a positive half-wave (see

j fig. 2, current H). At the output of block 5 there will be a sequence of rectangular pulses corresponding to the arrival of positive pulses. The analyzer 6 detects the disappearance of rectangular pulses corresponding to negative signals, and

1 generates a signal that indicates that at such a fire alarm loop, the negative signal transmission circuit is broken, and this, in turn, indicates that the security sensor 7 is triggered.

S At the time of the fire safety sensor actuation, the operation is similar to the operation when the security sensor is triggered, only the circuit of passing the positive interrogation pulses is broken, which corresponds to the current 1 in FIG. 2, and a signal from the analyzer 6 is issued, indicating that a fireproof sensor has been triggered in the fire and security loop.

Resistors 9 and 12 are needed to normalize the signal level at the input of receiver 5, and in the event that

5 the short circuit of the link, then the input of the block 5 signal level increases (see current I, dash-dashed line in Fig. 2), in turn, will increase the duration of the pulses generated by the threshold devices 15, 16 and decrease the duration

 pauses between the falling edge of the positive half-wave pulse and the leading edge of the negative half-wave. The analyzer 6 detects a change in the duration of the pulses and the pause between them and generates a signal about the short circuit of the link 3..

When the link 3 is broken at the input of the receiving device 5, the response pulses will be absent, the analyzer 6 detects the disappearance of the response pulses and generates a CBH3ji line break signal with an indication of the fire alarm loop.

The use of the proposed method of monitoring the state of the sensors provides, as compared with the known, the possibility of monitoring the blocking of the security and fire sensors in one slot, the possibility of issuing a violation signal indicating the type of violation (fire, alarm), the possibility

issuing the address of the security and fire plume, which will significantly increase the effectiveness of the use of means of protection of the people’s household objects.

invention formula

The method of monitoring the state of the sensors by author. St. -, distinguished by the fact that, in order to increase the reliability of the control, bipolar polling pulses are used, the response pulses of the sensors of each polarity are separated and the presence of each response pulse is monitored.

Sources of information taken into account in the examination I. USSR author's certificate

No. 415687, M. Kl.2 G 08 B 29/00, 03.22.71.

(prototype).

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Claims (1)

Claim A method of monitoring the status of sensors according to ed. St. - 415687, characterized in that, in order to increase the reliability of the control, bipolar polling pulses are used, the response pulses of the sensors of each polarity are separated, and the presence of each response pulse is monitored.