SU944112A1 - Device for testing n counters - Google Patents

Description

(5) DEVICE FOR CHECKING COUNTERS

 one

The invention relates to automation, telemechanics and computer technology and can be used to monitor electronic counters of the number of pulses.

A device for checking counters is known, comprising a pulse generator, a three-input element AND, a multi-input element OR-NOT and two-input elements OR-NOT by the number of counters 1.

A disadvantage of the known device is the inability to control 8 conditions when a simultaneous malfunction occurs, leading to a change in the coefficients of the group or all the counters.

The closest in technical essence to the present invention is a meter checking device comprising a three-input element AND, a pulse generator, a pulse generator, an OR-NOT element, a multiple-input AND-NO element, a three-input AND-NOT element, the NO element, a trigger, an element OR, display elements 2.

 The disadvantage of this device; tva are limited functionality, since it is not oy; is in the current cycle of testing failures that occur in several or all counters at different times C and not simultaneously) and have a different character (for example, one counter is faster and at the same time the other counter is slower.

The purpose of the invention is to expand the functionality.

The goal is achieved by the fact that the device for checking n counters contains a pulse generator, the output of which is connected to the first input of the pulse generator, the second input of which is connected to the control bus, the multiple input element And, (2n + 1) dictionaries, inverter, trigger , introduced (p-1) flip-flops, g of four-input elements And, n differentiating circuits, with the inverter input connected to the first control inputs of the triggers, to the inputs of counters and to the output of the pulse generator, control output to second, connected to the input of the multi-input element And, with the first inputs of the four-input elements And, the second inputs of which are connected to the inverse outputs of the respective counters, the direct output of each counter through the differentiating circuit connected to the corresponding input of the multi-input element And and the second controlling input of the corresponding trigger, the inverse output of which is connected to the third input of the corresponding four-input element And, the fourth inputs of all four-input elements And connected to the output of the inverted ora outputs of all the AND, You are a straight. the moves of all the triggers and the output of the multi-input element I are connected to the input of the corresponding indicator. The drawing shows a diagram of a device for checking n counters. The device contains a generator of 1 pulses, a driver of 2 bursts of pulses, a multi-input element IZ, elements,, ...., ,, ..,, cMdication, triggers 7, four-input elements I 8, differentiating circuits 9, inverter 109 controlled counters 11, bus 12 controls The device works as follows. In the initial state of the driver 2, triggers 7, the counters 11 are in the zero state (the installation circuits are not shown, and a pulse sequence is present at the output of the generator 1. In the Monitoring mode, the input of the driver 2 from the control bus 12 permits the signal that opens it, and the pulses from the generator 1 through the driver 2 arrive at the inputs of counters 11. After the number of pulses arrives at the inputs of the counters 11 equal to the conversion factor of the monitored counters, the driver 2 closes and the pulse The generators from generator 1 do not arrive at the input of the counters 11. 24 If all the counters 11 are intact, then at their outputs single Overflow signals appear at the same time, which, having passed through the differentiating circuits 9, arrive at the input of the element I 3. After the formation of a burst of pulses at the control output of the imaging unit 2, a single signal arises, which polls the element 3 and the elements 8. By the coincidence of these signals, a signal is formed at the inputs of the element 3 and its output, which includes the display element 4 Norm. Display indications ..., Slowly, the signal from the output of the corresponding elements And 8 is not included, since the inverse output of all counters has a low potential. The display elements, ..., Quickly, the signal from the direct output of the corresponding triggers 7 also does not turn on, since at the moment of the appearance of the signals at the outputs of the differentiating circuits 9, the driver 2 is closed and there are no burst pulses at its output. Let one of the counters 11 operate faster, and the other at the same time - slower. In this case, the filling of the counters 11 with pulses from the imaging unit 2 proceeds as described above. In this case, the output of the counter 11, which operates faster, a single overflow signal is formed before the formation of a burst from the output of the former 2 is completed. Then, two control signals coincide in the control inputs of the corresponding trigger 7: the first control input - the output signal a faulty counter, on the second control input, is one of the pulses of the pdchka shaper 2. As a result, a signal appears on the forward output of this trigger 7, which includes the corresponding indication element, ..., Quickly, and the signal from the inverse output closes the element And 8, which is connected to this trigger 7 by its input. The blocking of element 8 is performed in order to eliminate the ambiguity of the control, which could be manifested in the fact that after switching on the display element, ..., quickly, the corresponding epraE

Attempted faster to counter 11, upon termination of the formation of the pack would include the display element .., Slowly for the same counter 11 (since this counter 11 under 5 impulses of impulses arriving at its input would continue to operate until the end of the formation of the pack; ..

At the end of the formation of the bundle O, the signal from the test output of the imaging unit 2 interrogates the element AND 3. Since one of the counters is triggered faster, the signals at the inputs of the element 3 do not coincide 5 therefore, the Norm indicator does not turn on.

If one of the counters 11 operates more slowly, then at its direct output (after the formation of the 20th unit is completed, the burst from the output of the 2J imager does not generate a single overflow signal, but at the same time there is a high potential at its inverse output 25, which is fed to the input of the corresponding element AND 8. Therefore, the signal from the control output of the imaging unit 2 at the output of the element 8, which is connected to the slow trigger of the counter 11, generates a signal to turn on the corresponding indication element, ../5gP. ,

Thus, the proposed device in the current test cycle reveals all faulty counters, faults in which occur both simultaneously and not simultaneously in several or in all controls. controlled meters.40

Claims (2)

1. Author's certificate of the USSR N V97732, cl. H 03 K 21/3, IS. 2. USSR author's certificate number 736378, cl. H 03 K, 1977 (prototype). :