SU763880A1 - Device for forming pulse train - Google Patents

Description

one

The invention relates to the field of computing and automation and can be used as a generator of fixed pulse sequences for conducting test checks.

Devices Ij are known for generating test pulse sequences, Content switches, counters, distributors, AND and OR elements, encoders and triggers.

The disadvantage of these devices lies in their limited functionality, which does not provide, if necessary, a change in the sequence during its execution.

The closest to the proposed. the technical entity is a device t2 for forming a pulse sequence comprising a pulse generator, an output connected via the first element I to the counting input of the counter, a second input of the first element I connected to the output of the delay element, the first output of the count of the number of cycles and output of the number of pulse series in the loop interconnected. and under; are connected to the input of the delay element

and the installation inputs of the counters and the distributor, the outputs of which through the unit of the number of pulses in each series are connected to the first inputs of the node of the elements And, the second inputs of which are connected to the outputs of the first counter, to which the inputs of the output element are connected, the outputs of the node of the elements of And connected to

10 inputs. The first element OR, the output of which is connected to the first input of the element AND, to the second installation input of the first counter, the second input of the delay element and to the counting input

ts of the second counter, the outputs of the latter are connected to the inputs of the setters for the number of repetitions of the series and the number of series.in the cycle, the output of the latter is connected to the first input of the delay element,

20 and the output of the setpoint of the number of repetitions of the series is connected to the second input of the second element I, the output of which is connected to the distributor's counting input to which the second output of the counter of the number of cycles connected to its distributor is connected.

The disadvantages of this device are limited functionality.

capabilities and low reliability, due to the inability to change the sequence when it is higher / for example, to skip a series of pulses, both predetermined and by signals from external control devices, as well as to control the correctness of the series generation.

The purpose of the invention is to expand the functionality of the device by changing the sequence in the process of its issuance.

The goal is achieved. the fact that in the device containing the first delay element, the counter specifies the number of cycles in the sequence, connected to the output of the distributor, and the first output with the first inputs of the distributor, the first counter on the first OR element, the output of which is connected to the first input of the second counter, the second the input connected to the output of the second element OR, the first input of the first element And the second input of the first counter, a pulse generator connected to the output of the first input of the second element And, the output of which is connected to tr The first input of the first counter, the group of elements AND, the outputs of which are connected to the corresponding inputs of the second element OR, the first inputs with the corresponding outputs of the group of outputs of the first counter and the corresponding inputs of the third element OR, and the second inputs with the corresponding outputs of the first group of outputs of the pulse number switch each series, the group of inputs of which is connected to the group of outputs of the distributor, the switch for setting the number of series in the cycle, the inputs of which are connected to the corresponding inputs of the group of outputs The second counter and the corresponding inputs of the switch for the number of repetitions in the series, the output connected to the second input of the first element AND, the output of the third element OR is the output of the device / introduced a group of triggers, a switch of the numbers of the passed series, two elements OR, the second delay element, the comparison circuit and display unit. In this case, the first group of inputs of the comparison circuit is connected to the group of outputs of the second counter, and the second rtoynna of inputs - to the second group B | of the number of pulses switch in each series and the group of inputs of the switch of the numbers of the passed series, the outputs of which are connected to the first inputs of the corresponding group triggers, the second the inputs of which are connected to the corresponding outputs of the group of outputs of the valves and the outputs to the corresponding inputs of the fourth OR element connected by the output through the second delay element to the first the input of the fifth OR element, the second and third inputs of which are connected respectively to the second output of the counter, specifying the number of cycles in the sequence and the output of the first AND element, and the output to the second input of the distributor. The first and second outputs of the comparison circuit are connected respectively to the blocking input of the third OR element and to the input of the display unit and the second input of the first OR element, the third output of which is connected to the output of the switch of the number of series in the cycle, and the output with the first input of the first delay element, the second input and output of which are connected respectively to the output of the second element OR and the second input of the second element I.

The drawing shows a functional diagram of a device comprising a counter 1 defining cycles in a sequence, a second delay element 2 and an element AND 3, a first counter 4, a distributor 5, a fourth element OR 6, a first element AND 7, a pulse generator 8, the first delay element 9, the second element OR 10, a group of 11 elements AND, a switch 12 the number of pulses in X1 each series, a switch 13 specifying the number of series in a cycle, a second counter 14 a third element OR (output element) 15, a switch 16 the number of repetitions in a series, a comparison circuit 17 a node 18 indications, a switch of 19 numbers of the skipped series, triggers of 20-2 groups, outputs of the device 23, inputs 24–26 of the device, first 27 and fifth 28 elements OR,

Before working with counter 1, the number of cycles of the switch 13 is set - the number of pulse series in one cycle, switch 12 - the number of pulses in each series, and switch 16 - the number of repetitions of the selected series. The distributor 5, the counters 4 and 14, and the triggers 20-22 are in the initial state. The prohibition signal is sent to the AND 3 element from the output of the counter 1, and the pulses from the generator 8 do not pass to the counting input of the counter 4.

When starting the device, the signal from the output of counter 1 through the element OR 27 and the element of delay 9 removes the prohibition from the input of the element And 3, and. counter 4 accumulates impulses arriving at its input from generator 8. When accumulator 4 accumulates the number of pulses specified by switch 12 for its first output, the signals from the first step of distributor 5 and the output of counter 4 will occur at the input of the first element I of group 11. output

the first element AND group 11 through the element OR 10 includes the element 9, which bans the element 3, for the duration of the transition process of interrupting the arrival of pulses from the generator 8 to the counter 4: At the same time, the signal from the output of the element 10 OR is set to the initial position. The counter 14 records the execution of the first series of pulses, and the signal from the output of the element And 7, the distributor 5 switches to the second step.

At the end of the transient processes, the blocking of element 3 is released, and the device similarly performs the following series of this cycle.

After the set of pulses of a given cycle specified by switch 13 is executed by a signal from the output of counter 14, switch 13 switches on delay element 9, prohibiting element 3 at the same time. At the same time, distributor 5 and counters 4 and 14 are reset to the initial position by the output of switch 13 and the cycles operation of the device is repeated a specified number of times, after which from the counter 1 to the installation inputs of the counters and the distributor 5, and through the delay element 9 to the input of the element 3, it is prohibited.

If the program provides for the repetition of one or several series of pulses (set using switch 16), the operation of the device is similar to that described, only after the counter 14 registers the first performance of this series (which needs to be repeated) from the corresponding output of this counter, switch 16 bans the And 7 element and the distributor 5 does not switch to the next step. The device accumulates this series for the second time. After its re-execution and registration by counter 14, the switch 13 removes the prohibition from the input of the And 7 element, which switches the distributor 5 to the next step, and the device executes the rest of the program.

If the program provides for the transmission of a series of pulses called switch 19, after the previous series has been executed and the distributor 5 switches from its output through switches 12, 19 one of the triggers 20-22 is switched, which through element OR b and delay element 2 switches the distributor 5 one step, i.e. The distributor 5 is switched two times. After a second switch, the distributor 5 signals from its output, this trigger is set to its original position, and the device executes the rest of the program.

The skip of a series of pulses on signals from an external device is carried out in a similar way, only the signals switching the triggers 20-22 are fed to the inputs 24-26 of the device.

When the device is operated, the correctness of the series production is monitored, i.e. issuing a series of pulses by the output element OR 15

0 is input when a resolution signal is received from the comparison circuit 17 at its input, which is generated only if signals arriving at the same inputs

5, the comparison circuits 17 from the particular cells of the distributor 5 and the counter 14 are the same.

If these signals do not match, what can happen if the initial installation of the distributor 5 or counter 14 is incorrect, or there is a failure, then. Yes, at the input of the element OR 15 there is a prohibition from the comparison circuit 17. At the same time, the comparison circuit 17 by the signal from its other output resets the distributor 5 and the counter 14 to the initial position, and the device continues to work.

If and after this the signals at the input of the comparison circuit 17 are not identical, then a repeated reset is performed. If the valve and the counter, and after a repeated reset, do not return to their original position, then node 18 is turned on, indicating that the device is faulty.

Thus, the device ensures the formation of a sequence of pulses and a change in the composition of the sequence according to a signal from an external device or according to a special switch.

Claims (2)

1. USSR author's certificate “according to the application 2307479 / 18-24, cl. G About F 1/04, 1975. 2. USSR author's certificate on the application 2475560 / 18-24, cl. G 06, F 1/04, 1977 (prototype).