SU1569624A1 - Control unit for pressure switch - Google Patents

Abstract

The invention relates to instrumentation engineering and makes it possible to increase the speed of a pressure switch. For this, the pressure switch control unit, along with the pulse generator 1, the waiting multivibrator 10, the counter 3 and the zero signal extraction unit 9, contains a three-input element 2I-OR 2, a decoder 4, an electronic switch unit 5, an indication unit 6, a comparison unit 7 and a unit 8 switches. The electrical circuit of the device allows excluding the unused channels of the pressure switch from the polling cycle, which increases its speed in abnormal situations. Due to the indication of the number of the polled channel, errors in processing the results are eliminated. 1 il.

Description

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The invention relates to a measuring and measuring technique and is intended for controlling switch switches.

The aim of the invention is to increase the speed of the pressure switch.

The drawing shows a diagram of a predictable device.

The pressure switch control unit contains a pulse generator 1, a three-input element 2I-OR 2, a counter 3, a decoder 4E electronic switches 5, an indication block 6, a polled channel number 5, a comparison block 7, a switch block 8, a zero signal extraction block 9 blowing multi-vibrator 10, start input 11 and counter reset input 12. 20

The device works as follows.

In the initial state, the electronic switches 5 are closed, the counter 3 is reset, all outputs of the decoder 4 have a high potential level, all the solenoid valves are closed, the switches of the unit 8 are open.

In the process of measurement, a signal is sent to the device input 11. Starting the signal. After the signal arrives, the signal is started at the input of the 2I-OR 2 element and another pulse from the generator 1 through the 2I-OR 2 element is fed to the input of the counter 3. At the same time, the counter 3 goes into the first state and, at the first output of the decoder 4, a low level signal is supplied to the first inputs of the block 5 of electronic keys, the block 6 of the display and block 7 compared to Qi. Comparison unit 7 has two groups of inputs. The inputs of the first group are connected to the outputs of the decoder 4, and to the inputs of the second - the outputs of the block of 8 switches. If at least one high level signal is present on all the compared pairs of inputs, then the control signal does not appear at the output of block 7. Since in the initial state all switches of block 8 are open, all inputs of the second group of block 7 have a high level signal, which means that the control signal at the output of block 7 is absent. At the same time, by the signal of the decoder 4, in the block 5 of the electronic keys, the first electronic key is opened, which causes the first electromagnetic valve to operate, and

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the indication unit 6 signals that the first channel is being polled. When the next pulse arrives from generator 1 through element 2I-OR 2 to the input of counter 3, the latter is transferred to the next state and the described sequence of actions repeats.

If during the operation of the pressure switch it is necessary to exclude any measurement points from the polling cycle, then in block 8 the switches with the numbers corresponding to the numbers of excluded channels are closed. As a result, signals of both high and low levels are received in comparison block 7 from switch block 8, which are compared with signals arriving at inputs of comparison block 7 from decoder 4. If both compare low pair signals appear on both inputs, t . at the time of interrogation of the excluded channel, at the output of the comparator unit 7 a control CHI-cash appears. By this signal, the zero signal extraction unit 9 is triggered by the waiting multivibrator 10, which generates a pulse at the OR input of element 2I-OR 2, as a result of which the counter 3 and the decoder 4 are transferred to the next state, and the block 7 again compares the levels of signals received from the outputs of the decoder 4 and the switch block 8 Switching time of the chain: block 7 compare — block 9 of the zero signal selection — standby multivibrator 10 — three-input element 2I-OR 2 — counter 3 — decoder 4, significantly less than the response time ktromagnitnogo valve however is advanced to the next state before the valve stem work-f pan. Thus, the pressure switch channels with the numbers corresponding to the closed switch numbers in block 8 are excluded from the polling cycle.

To stop polling, you need to remove the high level signal from the device launch input. The reset channel of the counter serves to return the counter 3 to the initial state and reset its outputs.

The use of the described device allows to increase the speed of the pressure switch in abnormal situating by the comparison unit and the switch unit, and the control input of the control unit is connected to the first input AND of the three-input element 2I - OR, the second input of which is connected to the output of the pulse generator, the output of the three-input element 2Y-OR connected to the input of the counter, the output of the control box of the pressure switch iQ of which is connected to the input of the decoder

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and improve the reliability of the results obtained by eliminating errors in processing the measurement result due to the indication of the polled channel number.

Claims (1)

Invention Formula It contains a pulse generator, a standby multivibrator, a counter and a zero signal extraction unit, characterized in that, in order to increase the speed of the pressure switch, it is equipped with a three-input element 2I - OR, a decoder, an electronic switch unit, with control outputs of the pressure switch, a block / 15 with the corresponding inputs of the display unit, the unit of electronic keys and the unit. The second group of inputs is connected to the outputs of the switching unit and the output of the comparison unit through the zero signal extraction unit and the waiting multivibrator is connected to the third OR input of element 2И - OR. decoder outputs are connected five with the corresponding inputs of the display unit, the unit of electronic keys and the unit. The second group of inputs is connected to the outputs of the switching unit and the output of the comparison unit through the zero signal extraction unit and the waiting multivibrator is connected to the third OR input of element 2I — OR.