SU824146A2 - Programme-control device - Google Patents

Description

The invention relates to automation and can be used in devices for programmed control of chromatographic analysis. A device for software control of chromatographic analysis is known, comprising a control unit a temperature setting rate setting unit, a temperature setting unit and a time delay unit, the control unit being connected to an input of a temperature setting rate setting unit, a time delay unit and a temperature setting unit whose other input is The output is connected to the output of the speed setting unit, and the output is connected to another input of the exposure module, which is connected to the input of the setting unit, The temperature of the ClJ. A disadvantage of this device is that it provides only one function of the software for controlling the chromatographic analysis — time schedule programming of the chromatograph column temperature. According to the main auth. No. 742876: isaacti device containing serially connected pulse generator, frequency divider, counter and program setting block, the outputs of which are connected to the triggers through the main elements AND, the other inputs of the main elements AND are connected to the output of the frequency divider, the series-connected elements OR, the converter the memory block, as well. according to the number of triggers, are additional elements AND, the first inputs of which are connected to other outputs of the frequency divider, the second inputs - to the outputs of the trigger, and the outputs - to the inputs of an element and OR 2j. The disadvantage of the device is low control accuracy. This is due to the fact that commands to turn on and off the chromatograph nodes, for example, the measurement limit switches, columns, and the computing device, are carried out only according to the time schedule, without taking into account the change in the exit time of the chromatographic peaks. The time of their release is unstable and depends on the relative concentration of the components, temperature change, consumption of hectare; and some other destabilizing factors.

The device for software control provides commands and switches on and off executive devices in accordance with the installed program, at which command delivery in time remains unchanged.

The purpose of the invention is to increase the accuracy of the device.

This goal is achieved by the fact that sequentially connected extremum determination unit, a comparator and two triggers, as well as the third and fourth additional triggers, and the second and third additional elements And, the first inputs of the second additional elements And connected to other outputs of the program's task block, the second inputs to the output of the first additional trigger, and the outputs to the inputs of the third and fourth additional triggers, the outputs of the third additional trigger s are connected to the first inputs of the third additional elements I, the second ones, whose inputs are connected to the output of the second additional trigger, and the outputs to the second inputs of the fourth additional triggers;

Fig. 1 is a block diagram of the device for software control; Fig. 2 - diagrams on the operation of the device.

It contains a generator of 1 pulses, a divider of 2 frequencies, a counter 3, a block 4 for setting a program containing temporary tires (units of seconds, tens of seconds, units of minutes, tens of minutes), basic elements AND 5-8, first additional elements AND 9 , 10, element OR 11, converter 12, memory block 13, main triggers 14 and 15, second additional elements AND 16 and 17, third additional elements AND 18 and 19, extremum determination unit 20, comparator 21, .first 22 and second 23 additional triggers, trets 24, 25, and fourth 26, 27 additional triggers and generation torus 28 single pulses. The other outputs of the divider 2 frequency are connected to the inputs of additional elements AND 9, 10, the outputs of which are connected to the inputs of the element OR.

FIG. the signal U (t) representing the chromatographic peaks is represented by a continuous line, and the same signal is shown by a dotted line, but is delayed by a delay unit for a time, i.e. signal U (t-). Dependence and Derivative Value

ii

 is determined as the difference between

d-t

the original function U (t) and the delayed

U (t-. Fig. 2 shows the change

ai

derivative

according todt

a change in the function U (t), Ha of FIG. 2, and a change in the output (control) signal of the comparator in accordance with the change in the derivative.

The device works as follows.

When turned on, the pulse generator 1 starts operating, and the frequency divider 2 and the counter 3 are in a forbidden state. When the Start button is pressed, a pulse from the generator of 28 SINGLE pulses goes to frequency divider 2 and counter 3, the prohibition is lifted and time starts to run. The voltage levels from meter 3 go to block 4 of the program settings and, depending on which of its circuits will be connected to the inputs of the main elements 5 and 7, include triggers 14 and 15.

During the chromatographic analysis, a signal U (t) is sent to the input of the extremum determination unit 20, which reflects the concentrations of the components of the analyzed mixture in the form of peaks (represented by a continuous line in Fig. 2c), appearing at different times. At the same time, at the output of block 20, a signal appears that reflects the change in the derivative -yy- (Fig. 2

When the function U (t) passes an extreme value by maximum / i.e from increasing to decreasing, the derivative goes through zero - from positive to negative value. In this case, the comparator 21 is triggered and gives a negative signal abruptly (for example, FIG. 2b). , commands for storing the amplitude value of the desired peak from the chromatographic spectrum).

When connected between the output of the comparator 21 and the trigger input.22 of the switch and the inverter, the control commands corresponding to the extremesh points are maximized.

In this case, it is possible to record the amplitude values of the signals of the peaks of the analyzed mixture, to memorize them with a separate memory unit / memory unit 13, and to use the stored signals for control. Auxiliary circuits (stop, reset, etc.) and the aforementioned J blocks, a switch, an inverter, an additional memory block), as well as links between them are not shown in the drawing.

Claims (1)

When the function of the Extreme Minimum value goes from decreasing to increasing, the derivative passes through zero from a negative to a positive value and the comparator 21 abruptly outlines the positive control signal (Fig. 2b) used for commands for switching columns, switching measurement limits, and other operations. The trigger 22 is triggered by positive pulses received from the output signal of the comparator 21. The output signal (pulse) of the trigger 22 arrives at AND 16 and 17. The other inputs of the AND 16 element receive signals in tens of minutes, units of minutes and tens of seconds. The circuits for transmitting signals of units of seconds with a divider 2 frequency to the element 16 are not connected. In this case in the presence of voltage levels at the remaining inputs of the element And 16), the operation of the element And 16 occurs due to the incoming pulse from the trigger 22 always at the time of the extremum passing. Temporary commands arriving at the AND 16 element from the buses of tens of minutes, units of minutes and ten seconds of block 4 Task programs provide a choice from the spectrum of chromatographic peaks, only those peaks that are necessary for regulation, control, range switching, storing, calculating and transferring information on computers involved in the ACS. The installation in block 4 of the setting of the programs of a numerical value of tens of seconds is determined by the limit of the possible range of movement of the exit time of the chromatographic peaks. When element I.16 is triggered, its output signal goes to the input of trigger 26 and the switching device is switched on (in other cases, switching). At the same time, the output signal of the And 1b element is fed to the input of the trigger 24, the output signal (level) of which is fed to the input of the And 18 element, and on its second INPUT a signal (pulse) is output from the second additional trigger 23. The output signal of the trigger 23 through is during the passage of the second extremum, i.e. next extremum to a minimum. When this happens, the element G8 activates, and trigger 24 returns to its initial state, shutting down (or switching the actuator.). Thus, a simultaneous exact shutdown occurs at the next extremum of the minimum signal (since at this point the component has ended) and timely activation of the actuator for measuring the peak of the next component. Since the outputs of the part of the main triggers 14 and 15 are connected to the first inputs of the And 9, 10 elements, and their second inputs are connected to the corresponding outlets When the divider frequency is 2, then, depending on the installed program, frequency corresponding pulses are sent to the OR 11 element, which determines the rate of temperature rise.The output signals of the OR 11 element are sent to the converter 12 connected to the input of the memory block 13. The output signature of the block 13 the memory grows in proportion to the number of pulses fed to the converter of the number of pulses 12 in electrical voltage. The output voltage from the memory unit 13 is increased as a control signal to the input usi thermostat thermostat (not shown). Thus, by controlling the chromatographic analysis using the proposed device, the accuracy of measurement of the composition of the analyzed substances is improved, and, consequently, a more accurate value of the control signals for regulating technological processes on production lines. This allows you to improve the quality of products manufactured in the refining, petrochemical, gas, chemical. and other industries where advanced chromatographs are used. The invention device for software control auth.St. No. 742876, characterized in that, with the aim of increasing the accuracy of the device, a serially connected extremum determination unit, a comparator, the first additional trigger, the ger and the second additional trigger, and also the third and fourth additional triggers are entered and by their number the second and the third additional elements, And, the first inputs of the second additional elements And connected to other outputs of the program setting block, the second inputs - with the output of the first additional trigger, and the outputs - with the inputs of the third and fourth extensions itelnyh triggers outputs third additional flip-flops are connected to first inputs of third and additional elements, the second inputs of which are connected to the output of the second further flip-flop, and the outputs - to the second inputs Fourth Modes triggers. Sources of information, rintye taken into account during the examination 1. USSR Copyright Certificate 498608, class 2C 05 D 23/19, 1974.. 2i USSR author's certificate 742876, cl. G 05.0 23/13, 12.08.77 (prototype).