SU1674131A2 - Device for monitoring intervals between pulses - Google Patents

Abstract

The invention relates to the field of automation, in particular, to devices controlling the pulse period. A distinctive feature of the device is that when the interval between the control pulses exceeds the set limit, it allows a controlled sequence to be output to the device and eliminates the ambiguity of the nature of the fault. The aim of the invention is to increase speed. The goal is achieved through the introduction of the elements OR 5 and AND 6. 2 Il.

Description

The invention relates to automation and can be used to control the pulse period, in particular in microprocessor systems to control the running time of programs, and is an improvement on the basic invention of the author. N 1343416.

The purpose of the invention is to increase speed.

Figure 1 shows a diagram of the device; figure 2 - timing diagrams.

The device contains multivibrators 1-3, the element And 4, the element OR 5, the element And 6, output 7, input 8.

The device works as follows

The time constants of the corresponding multivibrators t, G2, Gz,, are selected by the HJ ratio

Гз Г; t T:

the allowable interval between pulses is defined as

P t rz -f p, (2)

If the interval between the control pulses satisfies relation (2), then the first multivibrator 1 has time to go to the unoccupied state and return the second multivibrator 2, allowing the flow of control signals through the element 4 to the input of the third multivibrator 3 the output of the third multivibrator 3 through the element OR 5 is fed to the output of the device, which is a sign that the interval of monitored pulses is within the specified limits

If the controlled impulses start arriving after the time interval ti Г2 + Г |, before the arrival of the next impulse, the second multivibrator 2 will go to the unexcited state and prohibit paray

ABOUT

Xi

WITH

iho

element bot 4. And the next pulse will not go to the input of the third multivibrator 3, which will also go to the unexcited state and open element 6 to pass the control pulses through the element OR 5 to the output of the device, which is an indication of the output interval between the pulses beyond tolerance.

If the interval between pulses of t. 2 t, then the first multivibrator 1 will be in the excited state, and the second multivibrator 2 will be in the unexcited state, prohibiting the operation of element I 4, which will cause the third multivibrator 3 to go into the unexcited state. In this case, the element 6 will open, through which the control pulses arrive at the element OR B and the device output, signaling that the interval between pulses is outside the tolerance.

The absence of any signal at the output of the device indicates a failure of the source of control pulses or failure of the device itself.

Claims (1)

Claims of Invention A device for monitoring the pulse interval according to the author. No. 1343416, characterized in that, in order to increase the speed of the device, the OR element and the second AND element are additionally introduced into it, the first input of which is connected to the input of the first multivibrator, the second input of the second AND element is connected to the inverse output of the third multivibrator, direct output which is connected to the first input of the OR element, the second input of which is connected to the output of the second element AND, the output of the OR element is the control output of the device, shh