The hottest PLC development trend and domestic mar

PLC development trend and domestic market

PLC has developed for nearly 40 years. With the development of semiconductor technology, computer technology and communication technology, the field of industrial control has undergone earth shaking changes, and PLC is also constantly developing towards new technology

first, the development of PLC networking technology, which has two trends: on the one hand, the PLC networking system is no longer a self-contained closed system, but is rapidly developing to an open system. In addition to the major brands of PLC, they can form their own unique PLC networking system to complete equipment control tasks. In addition, they can also connect with the upper computer management system to realize information exchange and become a part of the entire information management system; On the other hand, fieldbus technology has been widely used. PLC and other intelligent equipment installed on the site, such as intelligent instruments, sensors, intelligent solenoid valves, intelligent drive actuators, are connected through a transmission medium (such as twisted pair, coaxial cable, optical cable) and transmit information to each other according to the same communication protocol, thus forming a field industrial control network, Compared with the simple PLC remote network, this network has more flexible configuration, more convenient expansion, lower cost, better performance price ratio, and more open significance

second, PLC is developing towards high-performance miniaturization. The functions of PLC are becoming richer and richer, while the volume is becoming smaller and smaller. For example, Mitsubishi's fx-is series PLC, the smallest model, has a volume of only 609075mm, which is equivalent to a relay, but it has the ability of high-speed counting, slope, alternating output and 16 bit four arithmetic, as well as the function of adjustable potentiometer time setting. PLC is no longer a flexible product that can only carry out on-off logic operation in the early days, but has increasingly strong analog processing capacity, as well as other advanced processing capabilities that were only available on computers in the past, such as floating-point operation, PID regulation, temperature control, precise positioning, step-by-step drive, report statistics, etc. In this sense, the difference between PLC system and DCS (distributed control system) is getting smaller and smaller. Using PLC can also form a process control system

Third, PLC operation is developing in the direction of simplification. At present, one of the difficulties of PLC promotion is that complex programming makes users prohibitive, and all programming languages of PLC from different manufacturers are different. Users often need to master more programming languages, which is more difficult. The programming and application of PID control, network communication, high-speed counter, position control, data recording, formula and text display are also difficulties in PLC program design. When programming them with ordinary methods, you need to be familiar with the meaning of relevant special memory, assign values to them during programming, and realize the corresponding functions by accessing them during operation. These programs are often related to interruption. The programming process is cumbersome and error prone, which hinders the further promotion and application of PLC. The development of PLC is bound to simplify the programming of complex tasks. At this point, Siemens has acted as a pioneer. Siemens s programming software has designed a large number of programming wizards. It only needs to input some parameters in the dialog box, and it can automatically generate user programs including interrupt programs, which greatly facilitates the use of users

at present, the automation level of China's industrial enterprises is generally low, and PLC products have great application space. For example, in the machinery industry, more than 50% of the equipment with pulse and voltage output control methods are still controlled by traditional relays and contactors. Therefore, the application potential of PLC in China is far from being fully developed. Since 2001, the machinery industry, as one of the basic industries, has become a new growth point of China's industrial development, with an average annual growth rate of more than 20%. Different from the feedback regulation of analog quantity in the process industry, the mechanical industry needs to chain and sequence control the switching quantity, so PLC has become the first choice of its control products. The rapid growth of the machinery industry and the current situation of automation provide a huge market space for the application of PLC

based on the above reasons and the current situation of China's rapid economic growth, China's PLC market will continue to grow at a high speed in the next few years. Based on the data provided by relevant materials and the analysis of the current business data of major manufacturers in China's PLC market, it is preliminarily estimated that the total amount of PLC sold in China is 3-4 billion yuan (excluding PLC equipped with imported main equipment), with an annual growth rate of 15-20%

at present, more than 95% of China's PLC market is occupied by foreign products. Domestic research units once developed PLC products, but they did not develop for various reasons. It is gratifying that domestic companies with strong strength have begun to expand PLC business and have a certain voice in China's PLC market. For example, the domestic brand of oyes, PLC-200 plc-300 various models, founded by Shenzhen aoyuexin technology company in 2008, has been produced on a large scale. Due to the panel's high gloss back appearance, the market share has increased steadily year by year, and the number of domestic cooperative enterprises has reached thousands, Compared with foreign brands, domestic manufacturers have the following advantages

product customization advantage due to fully localized R & D, production, sales and technical support, domestic PLC manufacturers can customize personalized products according to the special needs of users. In practical work, some users want to have switching input, switching output, analog input and analog output functions on a PLC module at the same time. At the same time, the output should have both relays and transistors. This general-purpose PLC can not provide special needs, domestic PLC manufacturers can quickly customize for users. It is difficult for Chinese users and employees of multinational companies to quickly feed back such special needs directly to foreign manufacturers, and it is difficult to promote product improvement

cost advantage due to the fully localized R & D, production, sales and technical support, domestic PLC manufacturers have a greater cost advantage, which is directly transformed into product price advantage

service advantages the services of domestic PLC manufacturers are implemented by relevant personnel of the company, and PLC manufacturers can directly face the end users. Because the technical personnel of the company fully understand their products and can quickly solve the problems found in practical applications, they can significantly improve the service level and quality. In addition, domestic PLC manufacturers can provide users with free value-added services before, during and after sales of PLC. Compared with international PLC manufacturers, domestic PLC manufacturers can respond to users' requirements faster

China's PLC market has a broad prospect. With the rise of domestic brands, China's heavy dependence on foreign PLCs will be changed. As long as everyone works together, the industrialization of domestic PLCs will have a bright future

tags:oyes PLC oyes PLC