SU1270760A1 - Signature analyzer - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to control certain specific objects. The aim of the invention is to increase reliability. The signature analyzer contains a time signal generator, a form: a signature generator, a display unit. impulse generator, impulse recorder, three AND elements and OR NONE element. The pulse recorder contains two triggers, the NOT element, and the element I. The signature signature analyzer can operate in four modes: generation of a general signature, a potential signature, a pulse signature 1, and window signatures. The pulse signature mode ensures the fixation of short-term changes in the input signal in the period between external clock pulses. The potential signature mode coincides with the mode of known signature analyzers. Common mode with & signatures - a combination of modes of potential and impulse signatures. Window signature mode is intended for testing external control signals of the measurement and synchronization window. 1 3.p.f-ly, 4 ill. yu | 05

Description

The invention relates to automation and computing and can be used to control discrete objects.

The aim of the invention is to increase the reliability of the control.

FIG. 1 shows the structural scheme of the proposed signature analyzer; in fig. 2 and 3 - electrical concepts of the pulse recorder; and pulse former; in fig; A - timing diagrams that show the analyzer operation ..

The signature analyzer (Fig. 1) contains the time signal generator 1, the control input 2 of the measurement window, the first element I 3, the synchronous input 4, the signature generator 5, the display unit 6, the information input 7, the pulse generator 8, the pulse recorder 9, the second and the third elements AND 10 and 11, the element OR-NOT 12, the first and second inputs 13 and 14 of the task of the analyzer operation mode.

The pulse recorder 9 (Fig. 2) contains the first and second triggers 15 and 16, the element is NOT 17, the element is And 18. The information inputs of the flip-flops .15 and 16 are combined and connected via a resistor 19 to the bus of the logical unit. The shaper 8 pulses (Fig. 3) contains the first element NOT 20, the capacitor 21, the diode 22, the resistor 23, the second element NOT 24,

In the time diagrams (Fig. 4), the following designations are accepted: the synchronization signal 25 at the synchronous input 4, the analyzed binary signal 26 at the information input 7J, the signal 27 at the output of the pulse generator 8, the signal 28 at the output of the pulse recorder 9.

Signature analyzer works as follows.

In the initial state, the triggers of the signature generator 5 and the pulse recorder 9 are in the zero state. Circuit set to the zero state conventionally not shown. The time signal generator 1 analyzes the external signal arriving at the control input 2 of the signature analyzer and generates at the output a signal from the measuring window, the beginning of which corresponds to the external Start condition, and the end to the external Stop condition. The signal of the measuring window is synchronized with the synchronization signal 25 (Fig. 4), arriving at the synchronous input 4 of the signature analyzer., And enables. the arrival of this clock signal through a logical element And 3 on the synchronization of the driver 5 signatures. Outside the measurement window, the formation of a signature is prohibited by a zero value coming from the output of the time signal generator 1 to the first input of the AND 3 logic element.

Signature analyzer allows you to analyze signal 26 in one of four modes of operation, which are set using mode selection signals at inputs 13 and 14 of the signature analyzer as follows:

Inputs 14

Mode

13

General signature

Potential signature

Pulse signature

Signature

window

The control signals can be received at the inputs 13 and 14 of the analyzer both from the corresponding circuits of the monitored discrete object and from the control panel of the analyzer.

Claims (2)

In the General signature operation mode, the logical unit signal is fed through the analyzer input 41 to the first input of the second logic element AND 10, allowing the analyzed signal 26 to pass from the information input 7 of the analyzer through the second logical element 10 to the first information input of the signature generator 5. At the same time, the signal of the logical unit is fed through the input 13 of the analyzer to the first input of the third logic element 11, allowing the output signal of the recorder 9 to pass through the logic element 11 to the second information input of the imaging unit 5 signatures. In addition, single signals from inputs 13 and 14 of the analyzer go to the first and second inputs of the element OR NOT 12, respectively, ensuring the formation of a signal of a constant logical zero at its output and transmitting this signal to the third information input of the signature signature 5. The signature obtained in this mode contains information about the logical state of the analyzed signal 26 at the time points corresponding to the front of the synchronization signal 25, as well as about the presence or absence of pulse changes of the analyzed signal 26 at the interswitch intervals of the synchronization signal 24 recorded by the pulse recorder 9, which the turn is started by the shaper of 8 pulses on the falling edge of the clock signal 25. In the Potential signature mode, the signal of a logical unit is fed through the input 14 of the analyzer to the first input to orogo AND gate 10 to permit the passage of the analyzed signal with a data input 26 of the analyzer 7 via the second AND gate 10 to the first data input shaper 5 signatures. Simultaneously, the logical zero signal goes through the analyzer input 13 to the first input of the third element And 11, prohibiting the output signal of the recorder 9 from passing pulses through the logical element 11, the output of which sets the signal of a constant logical zero, which is fed to the second information input of the driver 5 signatures and no effect on the value of the generated signature. In addition, a single signal from the input 14 of the analyzer, arriving at the input of an OR-NOT 12 logic element, both blocks the formation of a signal of a constant logical zero at its output. This signal arrives at the third information input of the forma- tor of 5 signatures and, with its zero value, does not affect the value of the generated signature in the specified mode. Received in this mode, the signature contains information only about the logical state of the analyzed signal 26 at time points corresponding to the front of the sync signal 25 and does not contain information about the pulse behavior of the signal 26 in the inter-clock intervals of the clock pulse 25, since the signal from the output of the recorder 9 pulses on The second information entry shaper 5 signatures is prohibited. In this mode, the analyzer's operation coincides with the work of a well-known signature analyzer, which ensures, for example, the applicability of signature tables obtained using a well-known analyzer for working with the proposed analyzer without reforming these tables. In addition, the mode can be used when the pulse behavior of the analyzed signal 26 in the inter-cycle interval is unstable, does not affect the behavior of the elements of the monitored discrete object and should be ignored. In the Pulse Signature mode, the logical zero signal is fed through the analyzer input 14 to the first input of the second element AND 10 prohibiting the analyzed signal 26 from the analyzer information input 7 through the second element 10, the output of which sets the signal of a constant logical zero, which is fed to the first information input of the driver 5 signatures and does not affect the value of the generated signature. At the same time, the signal of the logical unit is fed through the input 13 of the analyzer to the first input of the third element 11 and allowing the output signal of the recorder 9 pulses to pass through the logical element of And 1 1 to the second information input of the imaging unit 5 signatures. In addition, a single signal from the input 13 of the analyzer, fed to the second input of an OR-NOT 12 logic element, provides a constant zero signal at its output, which goes to the third information input of the 5 signature generator and does not affect the value of the generated signature this mode. The signature obtained in this mode contains information only about the pulse behavior of the analyzed signal 26 in the in-cycle intervals of the synchronization signal 25 and does not contain information about the logical state of the analyzed signal 26, since its passage through the logical element 10 to the first information input of the generator of the 5 signatures is prohibited. This mode is used to track the propagation paths of only pulsed signals and localize their source in a controlled discrete object. For example, by creating a common signature of the monitored discrete object being analyzed in the General signature mode and determining its mismatch with the reference value obtained earlier under similar conditions for a known good discrete object, you can clarify the cause of the mismatch by switching the analyzer to the impulse signature mode, generating the impulse signature the specified circuit and comparing it with the corresponding reference value. Having found a mismatch in this case, it is possible to localize the source of the erroneous pulse signal, the analysis was continued in the Pulse signature mode. In the event that the above signature coincides with the reference value, it is necessary to continue troubleshooting in the General signature mode, since in this case the impulse behavior of the analyzed signal corresponds to the reference value. In the Signature mode of the window, the logic zero signals are fed through the inputs 13 and 14 of the analyzer to the corresponding first inputs of the second and third logical elements AND 10 and 11, respectively, prohibiting simultaneously passing the analyzed signal 26 from the information input 7 of the analyzer to the first information input of the signature generator 5 and output the signal of the recorder 9 pulses to the second information input of the generator 5 signatures. In addition, the output of the logical element OR NOT 12 establishes a signal of a constant logical unit, which is fed to the third information input of the signature generator 5, ensuring the formation of a signature, the value of which does not depend on the behavior of the analyzed signal 26 that arrives at the analyzer information input 7 and depends only on the ratio of the start and stop signal occurrences to the analyzer's input 2 and the clock signal 25 to the analyzer's 4th input signal. The indicated signature n SOM is determine the presence of errors in the time of occurrence of signals Start or Stop, or change in the amount of 25 clocks, raspolozhen11yh in m measuring window. . Window signature mode is used at the beginning of work with a monitored discrete object after it is connected to the analyzer and before analyzing signatures in other modes, since the parameters of the measured window are decisive when generating signatures of another specified type. If the window signature does not match the reference value, operation in other modes is impossible, since the signatures of other types will certainly not coincide with their reference values regardless of the presence or absence of faults in the analyzed circuits. Thus, the proposed analyzer makes it possible to use more fully the information about the behavior of the analyzed discrete signals and to increase the reliability of the control by forming a common potential-pulse signature. In addition, it is additionally possible to differentiate the errors in the formation of the measuring window, the errors in the formation of pulsed signals, the errors in the formation of potential signals caused by the presence of faults in the corresponding chains of monitored objects, which significantly expands the functionality of the proposed analyzer. Claim 1. A signature analyzer comprising a time signal generator, a signature generator, a display unit and the first element I, the input of the time generator of signals connected to the input of the analyzer measurement window, the output of the time generator of the first signal of the second input connected to the analyzer's synchronous input, and the output connected to the synchronous input of the driver signatures, a group of outputs of the signature generator is connected to a group of inputs of the display unit, which is because, in order to increase the reliability of the control, the analyzer contains a pulse shaper, a pulse recorder, a second and a third AND element and an OR NOT, and the information input of the analyzer connected to the information input of the pulse recorder and to the first input of the second element I, the input of the zero setting of the pulse recorder is connected to the output of the pulse generator, the input of which is connected to the synchronous input analysis torus pulse recorder output is connected to a first input of the third AND gate, the second inputs of the second and third elements and connected respectively to perem and second inputs of OR-NO element and are sootvets; tween first and second inputs specifying the operating mode of the analyzer. the second, third and fourth information inputs of the signature generator are connected respectively with the outputs of the second and third elements 5 And the element OR NOT. 2. The analyzer according to claim 1, wherein the pulse recorder contains two triggers, an NOT element and an element, the output of which is the output of the recorder, the first and second inputs of the element AND are connected respectively to the outputs of the first and second triggers, the installation inputs which zero are combined 15 and connected to the setup input to the zero of the recorder, the synchronous input of the first trigger is connected to the input of the element NOT and is the information input of the recorder, the output of the element 20 is NOT connected to the synchronous input of the second trigger, the information inputs of the first and second, triggers are combined and connected to the bus of the logical unit. Omi naz Fich.Z