2=2=Information reference system manual The basic software of the system software provided by the manufacturer is solved, and several advanced and feasible tests, the righteous device, quickly complete the fault judgment, and put forward an effective inspection of the factory. The production practice service is a more direct and urgent technical problem keyword diagnosis; logic analysis; glitch triggering, the characteristics of CNC system failure In recent years, many companies have introduced a large number of advanced CNC machining equipment at home and abroad. A variety of CNC machining centers are used in the body, so the cost of damage caused by the shutdown is much larger than that of the traditional machine tool. The core problem of quickly troubleshooting to restore the normal operation is that it must be measured as soon as possible.啼 where the number of machine tools is 91. It is really difficult to use microprocessors. The large-scale shank integrated circuit is the standard loyalty. Therefore, the repair and inspection methods are very different from the traditional mechanical equipment inspection and maintenance contents. The main feature of detecting the total or letter of the friend data domain is that the 1 digital signal is almost multi-line. 2 When executing a program, many signals appear only once or a certain signal. Although 1±汜 key signal only appears 夂3 repeating signal, the treatment periodicity 4 is not controlled by the excitation, + can, the classic time Domain 5 requires a test system that can trigger the trigger of the digital function trigger event and cause the event to be displayed. The fault of the CNC system may be component-level, component-level, or system-level; It is hardware or software. For example, a mechanically broken oxide layer defect in a certain integrated circuit may cause the device to fail; an undue short circuit or open circuit on the printed circuit board may cause a certain functional block to malfunction. Digital circuits and faults are various, resulting in a variety of The original murderer is also diverse, and the latter is the first to affect the logic function, which in turn makes the system function. The design rules are +. For understanding. To solve these problems, the key is to diagnose the fault diagnosis method by the light-sensitive test. The test object may be the whole system, or it may be a functional component, or it may be a general logic circuit or component.
Obviously, the more complex the logic function, the more difficult the test; the different degrees of complexity, the test methods are different. For example, for low-level logic circuits, it is possible to set up faults according to the line structure to seek tests. This structure test method is closer to the actual line and has Conducive to fault location for component level, such as microprocessor. Large-scale integrated circuit chips, such as storage devices, have strong logic functions. They are composed of thousands of knives or logic gates. There are only a few measurable pins on the outside. Therefore, only functional tests can be performed. The whole system, functional testing is a common method. In the product development process, the components used should be tested first, and then the functional components should be tested. Finally, the whole system is tested. The test path is reversed during the maintenance process. First, the whole system is inspected. Functional faults, reduce the fault range as much as possible through fault analysis, and then check the faults from large to small until the faulty device or fault location is found. It should be tested according to different conditions according to different conditions, which is beneficial to reduce the test cost. The commonly used methods and techniques have 1.1 actual installations, 麴 4 received 5 packs of praise 19, and tons of toe only, chat. 1 ring pool coffee 6 installation method or replacement method This method is a skeptical element å¿ function department å¿. Replace with a well-known å…€ device of 6, whether the system is often used. In turn, it is judged whether there is a suspected part. After the replacement of the land, the system 1 is often used, indicating that the original suspect is correct, and 6 indicates that the fault is simple and easy. No, it is necessary to deeply understand the system under test, but it needs to have components or function boards. The cost is higher. 1.2 Comparison method is a common method. For example, the series of input information is simultaneously added to the standard circuit and the circuit to be tested. Whether to compare the output of the two or not, to determine whether the circuit under test exists, of course, the content or method of comparison is different in different situations, some use the corresponding data comparison, some use the output shape comparison, and some perform the functional comparison. A very valuable test method.
1.3 Operation tracking method This method is to make the system in running state, capture and display the data activity of the node or online through the test instrument, and judge and find the fault through the analysis of the display result. Obviously, this method should respond to the system under test. In-depth understanding.
1.4 Excitation response method applies a fixed test excitation shape to the circuit or system under test. The more complex the hidden circuit is, the more complicated the required test excitation is. The method of generating the test shape can be used by a fixed algorithm. Hardware circuit implementation; can also take the required 2 test and maintenance At present, CNC machine tools can not automatically diagnose the specific location of the fault, often with the alarm number can have multiple causes, it is impossible to reduce the fault to a specific part of the logic analysis The instrument has real-time detection and fault diagnosis capability. The logic analyzer applies a pulse signal through the switch detection terminal or the input/output terminal, performs timing analysis on the line, detects whether the digital circuit timing status is correct, or finds the glitch interference where the logic analyzer is located by glitch trigger. The test data can be compared with the data of the public database in the computer, or stored in the database for future research. The computer in the system can communicate with the logic analyzer and the online tester, and has a public database to archive the repair information failure phenomenon detection data failure reason elimination method, etc. 1 fast format, 232 interface, can be connected with CNC machine tools. These are the basic domain testers for enterprise maintenance management and establishment of maintenance cooperation network between enterprises. The design of the mountain multi-line waver has been developed. The measurement amplitude is quantified by 1 and 0 according to the high and low levels of the digital circuit, and is also digitized by the clock on the time axis. Therefore, the measurement result is a series of numbers 0. All the measurements obtained during the time interval are stored in the memory of the logic analyzer. In addition, there is no corresponding trigger machine inside to form a digital identification device, so that the number of simultaneous occurrences of multiple é€1 Information 4 specifies that the trigger word matches the trigger to trigger the instrument, so that the measurement digital information of the period of interest of the measurer is frozen, which is convenient for analysis. 2.1 Waveform comparison analysis Selects the 1663 logic analyzer maintenance personnel if they are familiar with the work of the system in the system. Principle and signal waveform, it is very convenient to use logic analyzer to detect faults. Due to the technical confidentiality of the manufacturer, the comparison method and the excitation response method mentioned above must be used. When designing the printed circuit board, the manufacturer adjusts the convenience of maintenance. Multiple inspection terminals are designed on the printed circuit board. Users can also use these terminals or interfaces to compare and measure normal printed circuit boards and faulty prints. Brush the difference between the boards. That is to use the logic timing analyzer for good 褰, é¦ é¦ è°, è° Ç– Ç– Ç– ã‚· (8) è·«, exposed staff 徊庑藕湃⊙, 3 趾 嬲庖 嬲庖 嬲庖 æ¶ æ¶ æ¶ æ¶ æ¶ æ¶Timing analysis within the pick, the clock is asynchronously sampled 4 to 1 of the measured signal. On the multi-channel, the specific amplitude of the 屯 signal is ignored, so that the logic 伉 is preserved, and the inter-signal total is determined. The logic mode menu of the analysis mode can carefully test the timing between signals, and the logic waveform in the information analysis mode. The timing relationship between the signals can be carefully measured in the menu. The information waveform of the acquisition board can be obtained by comparing and analyzing. The trigger condition and logic waveform of the servo control busy board timing analysis should be noted to avoid triggering in the unstable transition state, using the trigger condition or, etc. as a limit. condition.
Waveform analysis trigger condition glitch trigger condition 2 Zhang Yuanpeng. The basis of computer processing technology. Peking University Press, 19969.
3 Wu Xinchun. Higher education psychology. Higher Education Press, 1999.7.
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