RU2141686C1 - System for express diagnostics of multiple- channel digital assemblies - Google Patents

Abstract

FIELD: automation and computer engineering, in particular, for testing operations of digital assemblies and circuits, for investigation and detection of their faults during tuning and usage. SUBSTANCE: device has data processing unit, code setter, multiplexer, control unit, signature production unit, frequency grid generator, effect generator, test setter, pattern setter. EFFECT: increased efficiency of failure detection due to information about failure using results of total object test. 4 dwg

Description

 The invention relates to automation and computer technology and can be used to monitor the health of digital blocks and circuits, search and localize faults in them both during adjustment and during operation.

 It is known "Device control digital units" by as N 1166121, CL G 06 F 11/26, containing counters, a register of reference signals, a trigger, an AND element, a pulse generator, a comparison circuit, a allocator, a read-only memory unit, a strobe pulse generator, a signature generation unit, a result register, an indication unit, input and output switches, self-test switch.

 However, the circuit of this device has a low reliability of the assessment and prediction of the technical state of electronic objects in the evaluation of time parameters, because the algorithm lacks blocks of measurements of temporal characteristics.

 The prototype of the alleged invention is a "control unit of digital blocks" by as N 1755207, CL G 01 R 31/26, comprising a test action generator, a data processing unit, a control unit, a switch (multiplexer), a memory unit, an address counter, a convolution unit, a comparison unit, a computer data bus input / output, an EMV address bus output, a bus output computer control, resistance meter unit, switch, output node, failure counter with a set of connections.

 The disadvantage of this device is the work until the first failure is detected, which complicates the identification of the causes of the defect in the presence of their combination.

 The technical result of the proposed invention is to increase the efficiency of failure diagnostics due to information about failures based on the results of a full inspection of the object.

 The technical result is achieved by the fact that in the express-diagnostic complex of multi-channel digital blocks containing a data processing unit, a code encoder connected to the control object, a multiplexer connected to the second output of the control unit, a signature shaper connected to the first output of the control unit, a grid shaper are introduced frequency coupled to the code master, data processing unit, control unit, multiplexer and action synthesizer, test master connected to the multiplexer, master yes, the data processing unit, the control unit and the action synthesizer, in addition, the control unit is connected to its second input through a serial connection of the image master and the data processing unit, the multiplexer is connected to the code master, and through the action synthesizer to the fourth input of the code master and through the control object - to the fourth input of the data processing unit, and the second input of the master of the dough is connected to the input, and the fourth output of the control unit to the output of the complex.

 The introduction of the test generator is necessary and sufficient for storing and entering at certain points in time digital codes that determine the effects of the effects synthesizer, switching codes and determining the program of the control unit when selecting the appropriate images in the image manager.

 The introduction of the action synthesizer is necessary and sufficient for the formation of signals of various types (discrete, analog) with an independent time shift relative to each other. The digital impact generation algorithm allows you to make changes to the output signals programmatically through the code generator. So analog effects can be formed on the basis of a complex signal conditioner according to RF patent N 2022460 with various values of fronts and recessions.

 The introduction of the specimen master is necessary and sufficient for permanent or temporary storage (when introduced from the software) of the amplitude-time parameters of the generated signals in a digital binary code. The choice of the required images is determined by the test master through the control unit.

 The introduction of a frequency shaper is necessary and sufficient for converting output information intervals with an allowable error within specified limits to verify compliance with a given manner on the response, construct actions with a given time shift, generate analog signals with a given amplitude-time characteristics, and synchronize signals.

 Thus, the positive technical effect of the introduced blocks and the totality of connections is to increase the efficiency of failure diagnostics due to information about failures based on the results of a full inspection of the facility; localization of the defect by periodic supply of the required signal until the causes of failure are clarified and eliminated.

 The block diagram of the complex express diagnostics of digital blocks is given in FIG. 1, in FIG. 2 is a variant of a fragment of a control unit, in FIG. 3 - variant of the synthesized effects: a - digital, b - analog. The element and circuit of the initial installation when power is not shown.

 The express diagnostics complex of multi-channel digital blocks (Fig. 1) contains a code master 1 connected to the control object 2, a signature generator 3 and a multiplexer 4 connected respectively to the first and second outputs of the control unit 5, a frequency grid former 6 connected to the master 1 code, data processing unit 7, control unit 5, multiplexer 4 and action synthesizer 8, test controller 9 connected to the multiplexer 4, code master 1, data processing unit 7, control unit 5 and action synthesizer 8, cro In addition, the control unit 5 is connected through a serial connection of the image master 10 and the data processing unit 7 to its second input, the multiplexer 4 is connected to the code master 1, and through the 8 synthesizer, to the fourth input of the code master 1 and through the control object 2 to the fourth the input of the data processing unit 7, and the second input of the test setter 9 is connected to the input 11, and the fourth output of the control unit 5 is connected to the output 12.

 A variant of the fragment of the control unit 5 contains an error fixing unit 13 through a counter 14 connected to the RAM 15, the other input of which is connected to the input of the unit 13 and connected to the data processing unit 7. The second input of the counter 14 connects the test unit 9 to the second input of block 13, the third input of which is connected to the RAM 15.

 The complex works as follows.

 In the initial state, the control unit 5 sets the verification mode of the control object 2 from the setter 9 tests, the potentials of the synthesizer 8 actions and setter 1 code. For example, if there is a data output by object 2 to two mutually exclusive consumers (ROM - a communication channel) or control of mutually exclusive signals (signals with different parameters at the same inputs - 6/19 8). The test unit 9 can be made in the form of ROM or RAM, with an input program from an external device at input 11 with a description of signals of the form of FIG. 3a, b.

After setting the initial mode, the command to start operation of the control unit 5 turns on the power of object 2 (the bus for setting the initial state, as is known, is not indicated) and the selected frequencies are supplied from the frequency grid driver 6. According to the algorithm set by the master 9, block 5, through the multiplexer 4, controls the action synthesizer 8, generating signals of a certain type, for example, FIG. 3a, b. In accordance with a given program, the synthesizer 8 changes the potential through a code master 1 at the control inputs of the control object 2 with a specific signal. Unit 7 data processing after applying a supply voltage to the object 2 provides:
- continuous monitoring of the compliance of the consumption current with the set standards, in the event of a deviation, fixes the fact, and if a certain / critical value is exceeded, it disconnects the supply voltage from object 2,
- control of contacts with the housing of contacts on program inputs,
- monitoring the presence of voltage at the programming inputs.

 The output information signal with the results of the control of the input action (of the form of FIGS. 3a, b) is compared by the processing unit 7 with the reference image from the setter 10. Negative results are recorded by the control unit 5 without stopping the verification algorithm. The grouped deviation results are visualized by the signature generator 3 or transmitted to the paired device, for example, a computer, at the output 12.

 In the process and at the end of the verification program, the signature generator 3 displays the results that allow us to analyze the set of deviations and decide on their most probable reasons with the resumption of the verification cycle from the beginning (element 14 of Fig. 2). The verification algorithm is maintained until the first failure (fixed by element 15 of Fig. 2), in which the control unit 5 switches to the repetition mode (element 13 of Fig. 2) of the formation of this action by the synthesizer 8 for the convenience of identifying the cause of the defect / deviation, after which the verification continues until next defect.

 Improving the efficiency of diagnostics of the control object is achieved by outputting the results with a serial digital code on the output 12 to the computer with the appropriate software, with the help of which the appropriate image standards / dough for input 11 can be set.

 Positive verification results are displayed by the 3 signature generator at the end of the program.

 The complex was tested on the model of control and technological equipment at the stage of the preliminary design of the 16-signal control device. During the test, the differences between the signals were simulated within the limits of 0.10 ... 30 μs, 20.. .60 μs and their various forms of contact bounce, the start time of the signal is 0.5 μs or more than 5 μs. The output of the controlled device was presented in the form of quantum-pulse modulation for two outputs, a serial binary code and contained the results of the conversion on the magnitude of the difference between the signals. . . . The resolution of KVIM is 0.5 μs, the duration of the information signal is 15 ... 400 μs.

The scope of verification included:
- checking for connections with the housing of the contacts of the software connector.

 - checking the presence and magnitude of voltages for programming.

- check current consumption,
- checking the pulse parameters of the output signals ....

 The positive effect was determined by the test time - no more than 1 min versus 1-2 hours when tested by standard means (at least 16 generators of type G5-54). The verification results were duplicated by monitoring the information signals of the control object by a system with digital representation of CVIM (about 2 m of paper with a system weight of more than 50 kg).

Claims (1)

 A complex for express diagnostics of multichannel digital blocks, comprising a data processing unit, a code master connected to the control object, a multiplexer connected to the second output of the control unit, characterized in that a signature driver is connected to the output of the control unit, a frequency grid driver connected to code setter, data processing unit, control unit, multiplexer and action synthesizer, test setter connected to the multiplexer, code setter, data processing unit, block the control and the action synthesizer, in addition, the control unit is connected to its second input through a serial connection of the image master and the data processing unit, the multiplexer is connected to the code master, and through the action synthesizer to the fourth input of the code master and through the control object to the fourth input a data processing unit, the second input of the test master connected to the input, and the fourth output of the control unit to the output of the complex.

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