SU1277138A1 - Device for checking parameters - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment and can be used to automatically control the technological parameters of various objects. The aim of the invention is to improve the accuracy of the device. The purpose of the invention is achieved by excluding the effect on the accuracy of the additive error device of the analog-digital converter. The device contains sensors, transducers, two switches, an adder, an analog-digital converter, a subtractor, a comparator, a remote control, a trigger, two OR elements, two memory blocks, two counters, a channel selection block, a signaling unit, a register, a recording unit, scaling. with block The positive effect reaches € s due to the introduction of a sum (L mator, a scaling unit, a second switch and a subtractor into the device. 3 Il.

Description

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00 The invention relates to electrical measuring equipment and can be used to automatically control the technological parameters of various objects. The purpose of the invention is to show the accuracy of the control. Figure 1 presents the block diagram of the device; figure 2 - subtractor circuit; FIG. 3 is a time diagram of the operation of the device. The device (FIGS. 1) contains sensors 1 - 1,;, converters 2 - 2, first switch 3, scaling unit 4, adder 5, second switch 6, analog-to-digital converter 7, subtractor 8, comparator 9, first-block 10 memory TI (memory register set 12), register days, remote control 13, trigger 14, clock generator 15, second memory block 16 (control word memory), first element OR 17, first counter 18 1-Mpuls (address counter) , the second element OR 19., the signal alert unit 20, the channel selection block 21, the second counter 22 pulses. (the relay counter)., The subtracter (FIG. 2) contains the first 23 and second 24 registers, 25 subtractors, the third registers 26, 27, 27z, and 28, output 29., i. / ii / -t, output The device works as follows in a way. Before the device starts operating, a pulse is emitted from the output of the console 13, which is sent to the control input of the counter 18 directly, and the counter 22 through the OR element 17 and sets them to the initial zero state. In addition, this signal through the element OR 19 enters the R-input of the trigger 14, sets at its output a zero potential which goes to the control inputs of the 15 clock pulses and the memory block 16, thereby prohibiting their operation. When a pulse control is received from another output of the console 13, the device starts operation. This pulse arrives at the S-input of the trigger 14, sets its output to a single state and enables the generator 15 and the memory block 16 to work. The pulses from the output of the generator 15 are fed to the counting input of the counter of 22 pulses. The code combinations from the counter of the counter of the 22 pulses go to the address inputs of the memory block 16. The frequency of the clock pulses from the generator 15 takes into account the speed of the blocks for which this control is intended. The temporal diagrams of the device operation are shown in FIG. According to the address code produced by counter 22, block 16 outputs and its outputs control words. The code combination installed in counter 18 is fed to the address input of channel selection 21, from the output of which a control signal is sent to the control input of the first switch 3 Connecting through the function 2 converter output, sensor 1 of the first channel to the output of the first switch 3. At the same time, the counter code 18 is fed to the address input of the memory block 10, where the upper and lower bounds of the tolerance field of the monitored parameter are stored, and register register 11, in which it is recorded with the arrival of the control signal from the corresponding output of block 16, the output code of the counter 18 remains unchanged during the monitoring of this parameter (sensor). At the first stage of monitoring according to this parameter, the signal .c output of sensor 1 through converter 2 and the first co-switch 3 goes to the scaling unit 4 and through the second switch 6 to the input of analog-digital converter 7, which is started by controlling the signal from the output of memory block 16 . The code proportional to the monitored parameter from the output of the analog-digital converter 7 is fed to the input of the subtractor 8, where the signal from the output 27 of the memory block 16 is written to the register 23. In the second stage, the signal from the output of sensor 1 through the converter 2 and the first switch 3 is fed to the first input of the analog adder 5, and the second input, which receives a signal from the output of the scaling unit 4. The output signal of the adder 5 through the second switch 6 via the control, the signal received from the fourth output of the block 16, goes to input A analog-to-digital converter 7, which, at a time corresponding to the speed of the blocks, is triggered by a signal from the first output of the block 16. The output code of the analog-digital converter 7 is fed to the input of the calculator

The cell 8 and with the arrival of the building signal on line 27 is written to the register 24. The outputs of the registers 23 and 24 are connected to the inputs of block 25, the output code of which, equal to the difference of the codes in registers 23 and 24, is fed to the input of the output register 26 and with the arrival of the control The signal from line 27 from the output of memory block 16 is entered into it. The difference code from the output of register 26, which is the output of the subtractor 8, is fed to the first information input of the comparator 9, the second input of which from memory block 10 receives the settings for the monitored parameter On the enable signal that enters the control input from the output of block 16 memory, in block 9, the output code of the subtractor 8 is compared with the settings received from memory block 10. If the control parameter is within the tolerance, then the Comparison End signal from the first control output of the comparator 9 to the first control input of register 11 records the result of the comparison in register 11. Thus, the register corresponding to the number of the connected sensor, as well as the result of the comparison. Then, the register 11 outputs the Ready signal to the control input of the registration unit 12, and if there is an enable signal from the control output of the registration unit 12, the sensor number and the comparison result from the register 11 are fed to the information input of the registration unit 12, where the monitoring result is recorded .

A signal from the end format, coming from the second control output of the register 11 to the counting input of counter 18 and through the second input of the element OR 17 to the control input of counter 22 and indicating the registration of the last character, increases the content of counter 18 by one and resets the initial position of the counter 22. At this, the output of the counter T8 forms the address code of the next datapoint (parameter), which is fed to the channel selection unit 21, the output code of which controls the first switch 3, switches the control circuit This parameter. In the future, the control process is carried out as described.

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In the event that the monitored parameter goes beyond the tolerance field, the comparator 9 additionally from the second control output entails a signal that is not suitable, which is fed to the input of the alarm unit 20, as well as to the second input of the OR 19 element, resetting the trigger 14 to the zero state and thereby prohibiting operation clock generator 15. The device is started up to continue monitoring in this case by removing the Start control signal from the console 13. Suppose that the signal arriving at the inputs of the adder 5 and the scaling unit 4 has the value x. Then, taking into account the additive error of the analog-digital converter 7, which has a value of l, the code ,, recorded after the first stage in register 23, has the form

N, (x + L) k.

where X x - k, is the output signal

scaling unit 4;

k, is the transmission coefficient of the analogue digital converter 7. The code recorded after the second stage in the register 24 has the form

N C (x + x) + l k.

where (x + x,) is the signal at the output of the adder 5.

From this, the code at the output of the subtractor 8 can be represented as

N N, - N k, (x + X, + d) - (x + D) k., - X

Thus, the code of the monitored parameter does not contain the additive error of the analog-digital converter 7, which is noBbmiaeT accuracy of the device.

Claims (1)

Invention Formula A device for controlling parameters, comprising p sensors connected by outputs to the inputs of corresponding converters connected by outputs to information inputs of the first switch connected by a control input to the output of a channel selector connected to the input of the first information input of the register to the input of the first memory block and the output of the first pulse counter connected by the control input with the first inputs of the first and second OR elements and with the reset output of the console connected to the start output to the S-in one trigger connected by an R input to the output of the second element OR, and an output to the control input BTOjjoro of the memory unit and to the input of a clock generator connected by an output to the counting input of a second pulse counter connected by an input to the output of the first element OR and the output to the address input of the second memory unit connected by the first, second and third outputs respectively to the control input of the analog-digital converter, to the control input of the comparator and to the first control input of the register connected The first output to the input of the registration unit connected by the output to the second control input of the register connected by the third control input to the control output of the comparator, the output to the second input of the first OR element and the counting input of the first pulse counter, and the second information input to the first output of the comparator connected with the second output with the input of the signaling unit and with the second input of the second OR element, and the first information input with the output of the first memory block, which, in order to improve the accuracy and control, an adder, a scaling unit, a second switch and a subtractor entered by the output to the second comparator information input, the control input - to the fifth output of the second memory block, and the input of an analog-digital converter connected to the output the second switch connected to the control input with the fourth output of the second memory block, the first information input to the output of the adder connected by the first input to the output of the first switch and to the input of the scaling block, and the second input is to the output of the scaling unit and to the second information input of the second switch.  2 Si FIG. 2