How to strengthen the anti-jamming technology in the weighbridge system

Improving the anti-interference ability of mechatronics products from the overall and logic circuit design is the guiding ideology of the overall design, and has a great relationship to improve the reliability and anti-interference performance of the system. For a newly designed system, if the anti-jamming performance is taken as an important issue, the anti-interference ability will be strong after the system is put into operation. On the other hand, if the equipment is found on the spot and the problem is repaired, it will often be half the battle. Therefore, in the overall design phase, there are several aspects that must be given special attention.
First, the logic design strives to be simple and reliable
For a specific mechatronic product, the logic design should be as simple as possible to meet the requirements of the production process control, so as to save components and facilitate operation. Because the number of components used in the whole is less under the premise of component quality, the probability of failure of the system during the work process is smaller, that is, the higher the stability of the system. However, it is worth noting that for a specific line, it is necessary to expand the stable reserve of the line and leave a certain load capacity. Because the working state of the line varies with the factors such as power supply voltage, temperature, load and so on. When these factors change from the rated condition to the deteriorated line performance direction, the range is called the stable reserve amount when the line fails to work normally. In addition, the line or component operating in the edge state, Zui is easy to accept external interference and cause failure. Therefore, in order to improve the load capacity of the line, consideration should be given to the load capacity. For example, the load capacity of a TTL integrated gate circuit can be with about 8 logic gates of the same type, but in design, generally only considers having 5-6 gates in order to leave a certain margin.
Second, the hardware self-test and software self-recovery design
Since the malfunction caused by interference is mostly sporadic, some measures should be taken to prevent such accidental malfunction from directly affecting the operation of the system. Therefore, in the overall design, it is necessary to try to make the fault caused by the interference return to normal as soon as possible. The usual way is to set up some automatic monitoring circuits on the hardware. This is mainly to strengthen the monitoring of some weak links in order to narrow the scope of faults and enhance the overall reliability. Commonly used monitoring and malfunction detection methods in hardware usually have parity of data transmission (such as input parity of input circuit related code), parity of memory, and related circuits of arithmetic circuit, decoding circuit and sequential circuit. Check and so on.
From the perspective of software operation, transient electromagnetic interference will affect: the contents of the stack pointer SP, the data area or the program counter, causing the CPU to deviate from the predetermined program pointer and enter the unused RAM area and ROM area, causing some deadlocks and dead loops. And the program "fly off" and other phenomena, therefore, the software "trap" and "watchdog" should be properly set and digital filtering (such as coarse error processing) in the detection process.
Third, take measures to eliminate interference from installation and process
1, reasonable choice of grounding many mechatronic products, from design ideas to specific circuit principles are relatively perfect. However, at the job site, it often fails to work properly, exposing many problems caused by unreasonable process installation, which makes the system easy to accept interference, which must be paid enough attention. If you choose the correct grounding method, consider that the AC grounding point is separated from the DC grounding point; ensure that it is logically floating (meaning that there is no conductor connection between the logic ground of the control device and the ground); ensure the safe grounding of the fuselage and cabinet. Quality; even the grounding of analog circuits and the grounding of digital circuits, etc.
2. Reasonable choice of power supply Reasonable selection of power supply is also crucial to the system's anti-interference. Power is an important source of external interference. Practice has proved that the interference noise introduced by the power supply is multi-channel, such as the frequent closing or disconnection of various switches in the control device, and the instantaneous on and off of various types of induction coils (including motors, relays, contactors, solenoid valves, etc.) The conduction and cut-off of switching devices in thyristor power supplies and high-frequency, intermediate-frequency power systems can cause interference. These interference amplitudes can reach the instantaneous kilovolt level and occupy a wide frequency. Obviously, in order to completely suppress such wide-band interference, it is necessary to take measures simultaneously for AC power and DC power.
A large number of practices have shown that the use of varistors and low-pass filters can greatly attenuate interference in the frequency range between 20 kHz and 100 MHz. The shielding layer of the isolation transformer and the power transformer can eliminate the interference below 20 kHz, and in order to eliminate the influence of the slow change of the AC grid voltage on the control system, measures such as AC voltage regulation can be adopted.
For DC power supplies, it is usually considered to maximize the power supply tolerance and voltage adjustment range. In order to adapt the equipment to a large range of load changes and prevent internal noise interference caused by the power supply, the power supply of the whole machine must have a large reserve and good dynamic characteristics. It is customary to generally choose a margin of 0.5 to 1 times. In addition, try to use DC regulated power supply. The DC stabilized power supply not only further suppresses interference from the AC grid, but also suppresses fluctuations in the DC operating voltage of the circuit due to load changes.
3. Reasonable layout
Reasonable layout of the various parts of the mechatronics equipment and system can effectively prevent the harm of electromagnetic interference. The basic principle of reasonable layout is to make the interference source and the interference object as far as possible, the input and output ports are properly separated, and the high-level cable and the pulse lead and the low-level cable are respectively laid.
There are also reasonable layout issues between devices in the enterprise environment. Different types of equipment have different types of interference to the environment, different interference intensity, and different anti-interference ability and precision. Therefore, equipment classification and environmental treatment should be considered in equipment position layout. For example, precision testing instruments should be placed in a constant temperature environment and away from mechanical shocks. The location of weak electrical equipment should consider the electromagnetic interference intensity of the working environment.
In general, in addition to the above solutions, strict process measures should be taken in terms of installation and wiring, such as paying attention to the layout of the entire system wires, reliable installation and good contact of the connectors, and attention to welding quality. Practice has shown that for a specific system, if the process is properly implemented, it can not only greatly improve the reliability and anti-interference ability of the system, but also make up for some design deficiencies.

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