Industrial control refers to industrial automation control, which is mainly realized by the combination of electrical and electronic, mechanical and software. It is industrial control or factory automation control. Mainly refers to the use of computer technology, microelectronics technology, electrical means, making the factory's production and manufacturing processes more automated, efficient, accurate, and has controllability and visibility. The emergence and promotion of industrial control technology brought about the third industrial revolution, which increased the production speed and efficiency of the factory by more than 300%. In the early 1980s, with the spring breeze of reform and opening up, foreign advanced industrial control technology entered the Chinese mainland. The widely used industrial control products include “PLC, frequency converter, servo motor, industrial computerâ€. These products and technologies have greatly promoted the manufacturing automation process in China and made tremendous contributions to the construction of China's modernization. The main core areas of industrial control are irreplaceable advantages in large power plants, aerospace, dam construction, industrial temperature control heating, and ceramics. For example, the real-time monitoring of the power grid requires the collection of a large number of data values ​​and comprehensive processing, and the intervention of industrial control technology facilitates the processing of a large amount of information. Industrial control has improved the safety and precision of the manufacturing and construction industries, and solved the industrial needs such as temperature, pressure, gas flow, and liquid flow. In the original need to semi-automatic and manual work evolution automation, including common air switches, pressureors, flow meters and so on. The working principle of industrial control: For example, the power control of the air switch, when the power is too large, the internal mechanical principle starts to operate, causing the switch to be automatically disconnected, thereby ensuring safe use of electricity for industrial or construction and accurately finding the short-circuit source. The core problem of industrial control equipment is anti-interference ability. If the anti-interference ability is not high enough, then this equipment is of little use. To improve the anti-interference ability of industrial equipment, the first thing is to learn to use plc correctly. 1, PLC's core power and input and output interface power supply should be independent Most users, when designing the system power supply, have only one power supply, and the power and interface of the PLC use this power supply. Those who know the principle of optocoupler will find that this connection will bypass the optocoupler. That is to say, the optocoupler does not play the role of isolation at all. The whole PLC is completely "streaking" without any protection. Ability, very dangerous! The correct approach is to add one more power supply, specifically to power the PLC core. The input and output interfaces can share one power supply. 2. If the output of the PLC is connected to an inductive load, such as a solenoid valve , a relay, etc., there is a load on the coil. It is necessary to add an absorption diode in reverse to both ends of the load. Specific methods, you can go to our website to view the wiring diagram of the product. Without this reverse diode, a back electromotive force is generated at the moment the solenoid valve or relay is opened. This back electromotive force, which is superimposed on the power supply of the output port, greatly exceeds the voltage withstand voltage of the output triode (or FET), resulting in breakdown of the triode. For the parameters of the reverse diode, as long as the current is not less than the relay current, the withstand voltage is not lower than the interface power supply voltage. Like the 1N4004, 1N4007, there is no problem. In addition, the solenoid valve on the market, if the wiring is marked with positive and negative, it means that there is already an absorption circuit inside, no external diode is needed. 3, the choice of power supply The interference signals are all high frequency signals. A typical interference signal source is a frequency converter and a thyristor voltage regulator circuit. Most of the power supplies on the market today are switching power supplies, which are small in size and high in efficiency. However, the biggest disadvantage is that high-frequency interference signals can be driven straight in. In the past, the old-fashioned power supply, which has a large-sized transformer, is bulky and inefficient, but can effectively suppress high-frequency interference signals. Therefore, when choosing the core power supply, you should choose the old transformer power supply. If you can't find the old transformer power supply, you can connect a 1:1 isolation transformer in front of the switching power supply, or connect the common mode coil at the input end of the core power supply to block high frequency interference. 4, layout There are two ways of interference, one is wire conduction and the other is space radiation conduction. The above 1 and 3 can solve the interference of wire conduction. The most effective way to deal with space interference is to add a shield (do not think that adding a shield is optional). The power distribution cabinet is a good shield. However, the shield is too helpless for interference from the inside. Since relays and even contactors are usually assembled in the power distribution cabinet, the relay will generate a high-frequency interference at the moment of disconnection, and this interference will interfere with the work of the PLC through space radiation. At this time, there must be certain requirements for the layout of the power distribution cabinet. The PLC should be as far away as possible from the relay and the high current cable controlled by the relay to reduce the space radiation interference. If the interference is still serious, consider wrapping the PLC with tin foil, which is equivalent to adding a shield to the PLC. After reading the above content, some equipment engineers will have doubts: "I have done this for decades (not following the above requirements), and there have been no problems?" Although the equipment is working, it is not the best condition and belongs to “work with illnessâ€. Micro Data Line is a portable version of the Data Line 2.0 standard. The Micro data cable has a smaller interface than the Mini data cable used in some mobile phones, and is the next generation of Mini data cable specifications. This data line supports OTG and is 5PIN like MINI data line. Micro-usb supports OTG and, like Mini-USB, is also 5PIN. The definition of Micro series includes Micro-B series slots for standard equipment; Micro-ab slots for OTG devices; Micro-a and micro-B plugs, and cables. The Micro series is unique in that they include a stainless steel case that can be inserted and removed for 10,000 times. Compared with the Usb Cable Type C, the Type-C interface is plugable, but the Micro USB interface is not.
Micro-usb connectors are smaller and space-saving than standard USB and Mini-USB connectors, with up to 10,000 plug and remove life and strength, and a blind plug structure design. The Micro-USB standard supports the OTG functionality of current USB, that is, in the absence of a host computer (for example, a personal computer). Data can be transferred directly between portable devices, compatible with USB1.1 (low speed: 1.5Mb/s, full speed: 12Mb/s) and USB 2.0(high speed: 60Mb/s). Provides data transmission and charging at the same time, especially suitable for high-speed (HS) or higher data transmission, is the best choice for connecting small devices (such as mobile phones, PDAs, digital cameras, digital camcorders and portable digital players, etc).
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