SU1372349A1 - Device for detecting pre-set level of checked parameters - Google Patents

Abstract

The invention relates to devices for automatically controlling the level of a signal and predicting the time to reach a critical level of an input signal in automated process control systems. The purpose of the invention is to enhance the functionality of the device by providing tracking of a decrease in the level of an input signal and highlighting a negative value of the rate of change of the level of the monitored parameter. The goal is achieved in that the device containing the sensor 1

Description

with

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VpoBHH, two threshold blocks 2.3, block 4 of reversible counting and time indication, block 5 of alarm, analog switch 7, first counter 8, controlled divider 9, driver 10 pulses, the second counter 11 is entered and the time indication is made of a pulse generator, an interval setting unit, two AND elements, a BANE element of counting and subtracting counters, an indication unit, a control level setting unit, a comparison unit and a trigger. When the analog signal reaches the first threshold, first threshold unit which enables the unit reversible counting and display time of the first counter and the second counter threshold unit controls the first analog kommuta1

The invention relates to devices for automatically controlling the level of a signal and predicting the time to reach a critical level of an input signal in automated process control systems.

The aim of the invention is to enhance the functionality of the device by providing tracking of the decrease in the level of the monitored parameter and the allocation of a negative speed value.

Figo shows a diagram of the device; FIG. 2 is a diagram of a reversible counting unit and time indication.

The device contains a sensor 1 level, threshold blocks 2 and 3, block 4 of reversing counting and time indication, alarm block 5, level setting block 6, analog switch 7, counter 8, controlled divider 9, pulse shaper 10 and counter 11 (speed) about

The block 4 of the reversing counting and indication of time is made of a generator of 12 pulses, a block 13 of setting intervals, an element I 14, a summing counter 15, and a calculation of 72349

-torom that changes the threshold level of the second threshold block until the next level change triggers this threshold block, the signal from the output of which changes the counting direction in both counters. In the block of the reverse counting and time display, the measurement interval is formed whose value is proportional to the predicted

time to reach the control time. The second counter accumulates the average value of the speed in the same time interval, which makes it possible at the end of the interval to recalculate the predicted time to reach the control level. When the second counter determines the negative rate of level change in the display unit, its value is displayed. Cf f-ly, 2il.

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the melting counter 16, the display unit 17, the control level setting unit 18, the comparison unit 19, trigger 20, BAN 21 and the 22 element

The device works as follows

In the initial state, the level from the output of threshold unit 2 prohibits the operation of unit 4 of reversing counting and time indication, threshold unit 3, counter 8 and alarm unit 5. In block 6 of setting levels, intermediate levels of the monitored parameter are stored, which, using an analog switch 7 controlled by a code from the output of counter 8, are received as reference to the input of threshold unit 3.

An increase in the level of the monitored parameter leads to the appearance of an analog signal at the output of the sensor 1 level proportional to the level of the parameter being monitored. When the analog signal reaches the first threshold at the moment of time, threshold unit 2 is activated, allowing operation of block 4 of the reverse counting and time indication, counter 8

and the threshold unit 3, while the signaling unit 5 records the achievement of the first threshold.

When obtaining permission for operation, counter 8 starts counting high-frequency pulses arriving at its input from the output of block 4 of the reversible counting and time indication. The analog switch 7 changes the level of the analog signal at the input of the threshold unit 3. Until the next change in the level of the monitored parameter leads to the triggering of the threshold unit 3, the signal from the output of which switches the counting direction of the counter 8 and the counter I1, while reading counters 8 and 11 begin to oscillate, with the readings of counter 8 being set or

 - 1 Р

+ 1

where A is the level of the controlled

parameter; P is the value of one threshold;

A part of the private is intact;

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This code corresponds to the level at the output of the analog commentator 7, which is equal to the level at the output of the sensor of level 1, and is fed to the input of the signaling unit 5 and the input of the reverse counting and time indication unit 4.

After receiving, at time t, a work permit, block 4 of the reverse counting and time indication works as follows. At the direct input of the element BANGE 21, an indication of the indication appears. The same signal enables the block 13 to set intervals, which of the clock frequency of the generator 2 generates

a sequence of short pulses with a specified time T

 t - These pulses are set to

trigger 20 at time t,

in such a way that its output signal permits the passage of pulses from a generator of 12 pulses through an AND 14 element to a summing counter 15 and prohibits the passage of a signal once 0 5 0

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solution of the indication through the element BANGE 21, and also allows the passage of signals to the subtracting counter 16 from the controlled divider 9 from time 11 to t, the same signal ensures overwriting at the time t of the new code of the division factor from the counter 1 1 to control splitter 9 and the formation at time t} of a short pulse at the output of shaper 10 pulses, which at time t resets counter 11 and provides code rewriting from the control level setting unit 18 to the subtracting counter 16, which when received and, at its input of pulses from AND 22, starting from time t, reduces the recorded code until the comparison block 19 determines that its output code matches the code at the output of counter 8, while the output signal of block 19 is comparable at time t switches the trigger 20 to the initial state o

Thus, a measuring interval t - t, is formed, the magnitude of which is proportional to the predicted time to reach the reference level.

The counter 11 after the next reset at the moment of time t works in such a way that by the end of the interval formed by the interval setting unit 13 it accumulates the average speed value at this interval, which provides an opportunity

In the interval of time interval t - t recalculate the predicted time to reach the control level.

When the counter 11 detects a negative speed value of the monitored parameter, from its second output, a command is given to the input of block 4 of the reverse counting and time indication, which prohibits the time indication and turns on the negative speed indication.

The process then repeats, and in block 5 of the alarm, the status of the counter 8 is displayed, which allows to judge the current level of the monitored parameter

Claims (2)

Invention Formula 1, Device - to detect a predetermined level of monitored five a parameter containing a level sensor whose output is connected to the input of the first threshold unit and to the first input of the second threshold unit, the output of which is connected to the first input of the first counter, the output of which is connected to the first input of the alarm unit and to the first input of the analog switch, the output of which is connected to the second the input of the second threshold unit, the output of the first threshold unit is connected to the third input of the second threshold unit, to the second input of the first counter, to the second input of the alarm unit and to the first input of the block Reverse counting and time indication, the first output of which is connected to the first input of a controlled divider, the output of which is connected to the second input of the reversible counting and time indication unit, pulse shaper output of which is connected to the second input of the reverse counting and time indication block, the level setting unit, the output of which is connected to the second input of the analog switch, is that, in order to expand the functionality of the device by providing tracking of the decrease in the level of the parameter to be rotated and the negative value of the speed are entered into it the second counter, the first output of which is connected to the second input of the controlled divider, the second output of the second counter is connected to the fourth input of the reversible counting and time indication unit, the first output of which is connected to the first input of the second counter and c the third input of the first counter, the output of which is connected to the fifth input of the reversible counting and time indication unit, the second output of which is connected to the third input of the controlled divider and with the input th formers pulses, the output of which is connected to the WTO 0 0 5 To the entrance of the second counter, the output of the second threshold unit is connected to the third input of the second counter. 2. The device according to claim 1, wherein THAT: the reversal counting and time indication block is made of a BANGE element, two AND elements, a trigger, a subtracting counter, a comparison block, a summing counter, a display unit, a pulse generator, an interval setting block and a control level setting unit, the output of which is connected to the first input of the detracting counter, the output of which is connected to the first input of the comparison unit, the output of which is connected to the first input of the trigger, the output of which is connected to the first inputs of the first / and second ele And the inverse input of the BAN element, the output of which is connected to the first input of the display unit, the direct input of the BANGE element is the first input of the block and combined with the first input of the interval setting unit, the output of which is connected to the second input of the trigger and to the first input of the summing counter, the output of which is connected to the second input of the display unit, the output of the pulse generator is the first output of the block and is connected to the second input of the interval setting block and to the second input of the second And element, the output of which is connected to the second at the input of the summing counter, the second input of the first element I is the second input of the block, the output of the trigger is the second output of the block, the second input of the detracting counter is the third input of the block, the output of the first ment And is connected to the third input of the subtractive counter is the fourth input of the block, the second input of the comparison block is the fifth input of the block. 0 five 0 .2