SU1193715A2 - Device for indicating conditions of checked objects - Google Patents

Abstract

DEVICE FOR SIGNALING ABOUT, CONDITION OF CONTROLLED OBJECTS by author. St. No. 639006, characterized in that, in order to improve the noise immunity of the device, a clock pulse generator is introduced into the Negro. . Each channel has a D-flip-flop, a pulse counter, a des-ifrator and a second And element, the first input of which is connected to the output of the contact sensor and the C-input of the D-flip-flop whose D input is the input of a logical unit of the device. The R input is connected to the reset button and to the second input of the second element I, and the output to the resolution input of the pulse counter, the reset input of which is connected to the output of the second element I, the synchronization input to the output of the clock generator, and the outputs of the pulse counter connected to the inputs the decoder, the output of which is connected to the first input of the trigger. objects "." "

Description

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The invention relates to signaling in radio engineering, can be used in long-distance radio engineering devices and is an improvement of the device according to the basic author. St. No. 639006.

The purpose of the invention is to increase the noise immunity of the device for signaling about the states of controllable objects.

The drawing shows a functional diagram of the proposed device.

The device contains a generator of 1 clock pulses, a signaling device 2, a reset button 3, and in each channel an AND 4 element, the first input of which is connected to the output of the contact sensor (not shown), D-flip-flop 5, counter () and pulses, decoder 7 , trigger 8, optical indicator 9, element I 10, adjusted on diodes

11 and 12, the resistor 13.

The arrangement works in the following way.

In the initial state, with the controlled objects disconnected, the sigpal “1. Pressing K11-button 3 for resetting the second inputs of trigger 8 and element 4 and the R-input of D-trigger 5 sends a ground signal (signal "O"), as a result of which the direct output of the trigger 8 and pi outputs of the element 10 and D Trigger 5 also establishes the potential of "Earth. In this case, the idle indicator 9 is not illuminated, the counter 6 is set to the state "O. At the output of the decoder 7, corresponding to the combination of the input signals, coming from the outputs of the counter 6, the signal "O" is also set. At the output of the decoder 7, connected to the nerves. By the input of the trigger 8, a signal "1, to which the trigger 8 does not react, is set. Alarm device

2 is turned off, because the diode 11 of the element AND 10 receives the signal “O from the direct output of the trigger 8.

When the reset button 3 is released at the R-input of D-flip-flop 5, the potential "Earth" disappears, the D-flip-flop 5 is further controlled via the C-input. In this case, in order for the O-flip-flop 5 to operate at the C input, a state change from "O to" 1 is necessary. In addition, the Earth potential disappears from the second input of the AND 4 element, and further the signal from the first input of the AND 4 element passes without a change to the output connected to the input. reset counter 6 pulses.

Connecting the monitored object to the device (the potential on the ground at the input) does not change the state of the latter, since the C input of D-flip-flop 5 changes the signal from "1 to" O, to which D-flip-flop 5 does not respond. In addition, the potential “Earth from the input goes through the element AND 10 to the reset input

the pulse counter 6, from the output of which the same combination is inputted to the inputs of the generator 7, as in the initial state, therefore the signal "O is present at the output of the decoder 7, which is not connected to the trigger 8. The latter still receives the logical" 1 , but at its direct output the “O.

If the normal state of the monitored object (any) is disturbed, the potential of “Earth” disappears at the corresponding input of the device. At the C input of the D flip-flop 5, a change occurs in the state of "O to" 1. D-flip-flop 5 is switched off, and at its output a signal "1" is received, which is fed to the enable input of the counter 6 pulses.

Since at the input of the device, the ground information of the Earth has disappeared, it also disappears at the output of the element E 10, and consequently, at the reset input of the counter of 6 pulses. The appearance at the two inputs of the counter (reset and resolution) of the potential of the logical "1 puts it into account mode.

After time, threshold time, determined by the frequency f of the generator 1 of clock pulses, a combination is established at the outputs of counter 6, at which the level of the logic "O appears at the output of the decoder 7 connected to the first input of the trigger 8. The latter switches. At its direct output, the signal "1" is set, and at the inverse - "O. Optical indicator 9 is turned on. The anodes of the diodes 11 and 12 of the And 10 element receive a logic level of "1, and the supply voltage at the input of the signaling device 2, which generates a sound signal.

In case of a short-term loss of the potential “Earth at the input of the signal device, which corresponds to the appearance of interference, D-flip-flop 5 is triggered, the pulse counter 6 goes into counting mode in the same way as in the previous case. However, after the interference time, which is less than the threshold time, at the reset input of the pulse counter 6, the potential of the “Earth Resetting and Blocking Counter” is reset. At the same time, at the output of the D-flip-flop 5, the potential of the logical ' 1 is preserved, which does not affect the further operation of the pulse counter 6.

Thus, if the interference time is less than the selected threshold time, the pulse counter 6 is not counted up to the emergency combination and is reset.

In case of mechanical damage to the channel at the input of the signal system, the potential of the "Earth" at the time of the accident is greater than the threshold time. Pulse count b is calculated to the emergency combination, and the alarm system is triggered.

Choosing the frequency f of the generator 1 clock pulses or choosing the appropriate

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The output of the decoder 7 can be set to work due to the occurrence of interference.

In the device, the required threshold is triggered-i. increase its noise immunity,

nor t and thereby eliminate his false

Claims (1)

A DEVICE FOR SIGNALING ABOUT THE STATE OF MONITORED OBJECTS by ed. St. No. 639006, characterized in that, in order to increase the noise immunity of the device, a clock pulse generator and _ - are introduced into it. Each channel is controlled by a D-trigger, a pulse counter, a deshifter, and a second AND element, the first input of which is connected to the output of the contact sensor and to the C-input of the D-trigger, whose D-input is the input of the logical unit of the device. The R-input is connected to the reset button and to the second input of the second AND element, and the output is to the pulse counter enable input, the reset input of which is connected to the output of the second AND element, the synchronization input is to the output of the clock generator, and the outputs of the pulse counter are connected to the inputs a decoder whose output is connected to the first input of the trigger. objects „ SU ,, „1193715> I 193715