Industrial control automation technology is a comprehensive technology that utilizes control theory, instrumentation, computers, and other information technologies to detect, control, optimize, schedule, manage, and make decisions in industrial production processes, aiming to increase output, improve quality, reduce consumption, and ensure safety. It mainly comprises three parts: industrial automation software, hardware, and systems. As one of the most important technologies in modern manufacturing in the 20th century, industrial control automation primarily addresses the issues of production efficiency and consistency. Although automation systems themselves do not directly create benefits, they significantly improve enterprise production processes. The development path of industrial control automation in China has largely involved the simultaneous introduction, assimilation, and secondary development and application of complete sets of equipment. Currently, China's industrial control automation technology, industry, and applications have all developed significantly, and China's industrial computer system industry has taken shape. Industrial control automation technology is developing towards intelligence, networking, and integration. I. Low-cost industrial control automation based on industrial PCs will become mainstream . As is well known, starting in the 1960s, Western countries relied on technological progress (i.e., new equipment, new processes, and computer applications) to transform traditional industries, leading to rapid industrial development. The biggest change in the world at the end of the 20th century was the formation of the global market. The global market has led to unprecedented competition, forcing companies to accelerate time-to-market (TQCS), improve quality, reduce costs, and perfect their service systems. While Computer Integrated Manufacturing Systems (CIMS) combine information and system integration to pursue a more comprehensive TQCS, enabling companies to "deliver the right information to the right people at the right time, in the right way, so that the right decisions can be made"—the "five rights"—this type of automation requires substantial investment. It's a high-investment, high-return, but also high-risk development model, making it difficult for most SMEs to adopt. In my country, SMEs and near-large enterprises are still pursuing low-cost industrial control automation. Industrial control automation mainly comprises three levels: basic automation, process automation, and management automation, with basic automation and process automation at their core. Traditional automation systems primarily monopolize the basic automation portion using PLCs and DCSs, while the process and management automation portions mainly consist of various imported process computers or minicomputers. The high prices of their hardware, system software, and application software deter many companies. Since the 1990s, the development of PC-based industrial computers (IPCs) has led to the rapid popularization of PC-based automation systems, which consist of I/O devices, monitoring devices, and control networks. This has become a crucial pathway to achieving low-cost industrial automation. Large enterprises like Chongqing Iron and Steel Company in my country have replaced their original DCS or single-loop digital controllers in almost all their large heating furnaces with IPCs, employing fuzzy control algorithms with excellent results. Because PC-based controllers have proven to be as reliable as PLCs and are accepted by operators and maintenance personnel, manufacturers are increasingly adopting PC control solutions, at least in some aspects of their production. PC-based control systems are easy to install and use, offer advanced diagnostic capabilities, provide system integrators with greater flexibility, and, in the long run, have lower maintenance costs. Since programmable logic controllers (PLCs) are most threatened by PC control, PLC suppliers are uneasy about PC applications. In fact, they are now joining the PC control "wave." In recent years, industrial PCs have experienced exceptionally rapid development in my country. Globally, industrial PCs mainly fall into two categories: IPCs (Industrial Control PCs) and CompactPCI-based industrial PCs, as well as their variants, such as AT96 bus-based industrial PCs. Due to the high demands of basic automation and process automation on the operational stability, hot-swapping capabilities, and redundant configuration of industrial PCs, existing IPCs can no longer fully meet these requirements and will gradually be phased out. They will be replaced by CompactPCI-based industrial PCs, while IPCs will occupy the management automation layer. In 2001, the state established the "Industrialization of Open Control Systems Based on Industrial Control Computers" major industrial automation project, aiming to develop PC-based control systems with independent intellectual property rights, capture 30% to 50% of the domestic market within 3-5 years, and achieve industrialization. Several years ago, when "soft PLCs" emerged, the industry believed that industrial PCs would replace PLCs. However, to this day, industrial PCs have not replaced PLCs, mainly for two reasons: one is system integration; the other is the Windows NT software operating system. A successful PC-based control system must possess two characteristics: first, all work must be completed by software on a single platform; second, it must provide customers with everything they need. It is foreseeable that the competition between industrial PCs and PLCs will primarily be in high-end applications, where data is complex and equipment integration is high. Industrial PCs cannot compete with low-priced micro PLCs, which is also the fastest-growing segment of the PLC market. Looking at development trends, the future of control systems likely lies between industrial PCs and PLCs, and signs of this convergence are already emerging. Like PLCs, the industrial PC market has remained stable over the past two years. Industrial PC software is much cheaper than PLCs. According to Frost & Sullivan, of the $700 million global industrial PC market annually, approximately $85 million is for control software and $100 million for operating systems. This market is expected to double by 2007, making it very substantial. II. PLCs are evolving towards miniaturization, networking, PC-based architecture, and openness. For a long time, PLCs have been the mainstay of industrial control automation, providing highly reliable control solutions for various automated control devices, forming a three-way balance with DCS and industrial PCs. At the same time, PLCs are also facing competition from other technological products, especially industrial PCs. Currently, there are approximately 200 PLC manufacturers worldwide, producing over 300 different products. The domestic PLC market in China is still dominated by foreign products, such as those from Siemens, Modicon, AB, OMRON, Mitsubishi, and GE. After years of development, there are now about 30 domestic PLC manufacturers, but none have achieved significant production capacity or established brand names. It can be said that PLC manufacturing in my country has not yet become industrialized. However, my country is very active in PLC applications, with a wide range of industries using them. Experts estimate that in 2000, the domestic PLC market sales volume was 150,000 to 200,000 units (of which imports accounted for about 90%), approximately 250,000 to 350,000 RMB, with an annual growth rate of about 12%. It is projected that by 2005, the national demand for PLCs will reach approximately 250,000 units, approximately 350,000 to 450,000 RMB. The PLC market also reflects the state of the global manufacturing industry, experiencing a significant decline after 2000. However, according to Automation Research Corp.'s forecast, despite the global economic downturn, the PLC market will recover, with the global PLC market estimated at $7.6 billion in 2000, returning to $7.6 billion by the end of 2005, and continuing to grow slightly. Miniaturization, networking, PC integration, and openness are the main directions for the future development of PLCs. In the early days of PLC-based automation, PLCs were large and expensive. But in recent years, miniature PLCs (less than 32 I/Os) have emerged, priced at only a few hundred euros. With the further improvement and development of soft PLC control configuration software, the market share of those with soft PLC configuration software and PC-based control will gradually increase. Currently, one of the biggest development trends in the process control field is the expansion of Ethernet technology, and PLCs are no exception. More and more PLC suppliers are now offering Ethernet interfaces. It is believed that PLCs will continue to shift towards open control systems, especially industrial PC-based control systems. Distributed Control Systems (DCS) were first introduced in 1975, with manufacturers primarily concentrated in the United States, Japan, and Germany. Starting in the mid-to-late 1970s, my country initially imported DCS systems as part of large-scale imported equipment sets, with the first batch including projects in the chemical fiber, ethylene, and fertilizer industries. At that time, almost all DCS systems used in my country's major industries (such as power, petrochemicals, building materials, and metallurgy) were imported. In the early 1980s, while introducing, digesting, and absorbing foreign technologies, China began tackling the technical challenges of developing domestically produced DCS systems. Over the past decade, especially since the Ninth Five-Year Plan, my country's DCS system R&D and production have developed rapidly, giving rise to a number of outstanding enterprises, such as Beijing Hollysys, Shanghai Xinhua, Zhejiang University Control Systems, Zhejiang VIA Technologies, Aerospace Measurement & Control, China Academy of Electrical Engineering, and Beijing Kangtuo Group. These companies have not only significantly increased the variety and quantity of their DCS systems, but their technological level has also reached or approached international advanced levels. Of the 4,426 DCS systems used nationwide in 2001, 1,486 were domestically produced, accounting for 35%. In just a few years, the dominance of foreign DCS systems in my country has ceased. These specialized companies have not only secured a certain market share and accumulated capital and technology for development, but have also significantly reduced the price of imported DCS systems, contributing to the promotion of automation in my country. At the same time, exports of domestically produced DCS systems have also been increasing year by year. Although domestic DCS development has made significant progress, foreign DCS products still hold a relatively high market share in China, primarily Honeywell and Yokogawa products. The annual growth rate of my country's DCS market is approximately 20%, with an annual market value of about 30-35 billion yuan. Since there are no readily available substitutes for DCS in large-scale automation systems in the petrochemical industry within the next five years, its market growth rate is not expected to decline. Statistics show that by 2005, over 1,000 sets of equipment in my country's petrochemical industry required DCS control; the power system installed over 10 million kilowatts of new generator units annually, requiring DCS monitoring; and many enterprises had been using DCS for nearly 15-20 years, requiring upgrades and renovations. Therefore, DCS's position as a major product in the automation instrumentation industry will remain unshaken for the next five years. According to survey data released by the China Instrument and Control Society, the DCS market situation in my country in 2002 was as follows: Miniaturization, diversification, PC-based architecture, and openness are the main directions for future DCS development. Currently, the market share of small DCS is gradually being shared with PLCs, industrial PCs, and FCSs. In the future, small DCS may first integrate with these three systems, and "soft DCS" technology will first be developed in small DCS. PC-based control will be more widely used in small and medium-sized process control, and various DCS manufacturers will launch small DCS systems based on industrial PCs. Open DCS systems will extend both upwards and downwards, allowing field data from the production process to flow freely throughout the enterprise, achieving seamless integration of information technology and control technology, and developing towards the integration of measurement, control, and management. IV. Control systems are evolving towards Fieldbus (FCS) Due to the development of 3C (Computer, Control, Communication) technologies, process control systems will evolve from DCS to FCS (Fieldbus Control System). Fieldbus-based control (FCS) can completely distribute PID control to field devices. FCS is a fully distributed, fully digital, fully open, and interoperable next-generation production process automation system. It will replace the traditional one-to-one 4 (20mA analog signal lines) in the field, bringing revolutionary changes to the traditional industrial automation control system architecture. According to IEC 61158, a fieldbus is a digital, bidirectional, multi-branch communication network between field devices installed in the manufacturing or process area and automatic control devices in the control room. Fieldbus enables measurement and control equipment to have digital computing and digital communication capabilities, improving the accuracy of signal measurement, transmission, and control, and enhancing the functionality and performance of the system and equipment. The IEC/TC65 SC65C/WG6 working group began working on developing the world's single fieldbus standard in 1984. After a difficult 16-year process, IEC 61158-2 was released in 1993. Subsequent standard development became chaotic. The IEC 61158 fieldbus international standard subset published in early 2000 consisted of eight types: Type 1 IEC Technical Report (FFH1); Type 2 Control-NET (supported by Rockwell Automation, USA); Type 3 Profibus (supported by Siemens, Germany); Type 4 P-NET (supported by ProcessData, Denmark); Type 5 FFHSE (formerly FFH2) High-Speed ​​Ethernet (supported by Fisher Rosemount, USA); Type 6 Swift-Net (supported by Boeing, USA); Type 7 WorldFIP (supported by Alsto, France); Type 8 Interbus (supported by Phoenix Contact, USA). In addition to the eight fieldbuses of IEC 61158, IEC TC 17B has approved three bus standards: SDS (Smart Distributed System); ASI (Actuator Sensor Interface); and DeviceNET. Furthermore, ISO published the ISO 11898 CAN standard. DeviceNET was approved as a national standard in China on October 8, 2002, and came into effect on April 1, 2003. Currently, in the competition among various fieldbuses, COTS (Commercial-Off-The-Shelf) communication technology, represented by Ethernet, is becoming a new highlight in the development of fieldbuses. Its focus is mainly on two aspects: (1) whether a globally unified fieldbus standard can emerge; (2) whether fieldbus systems can completely replace the currently popular DCS systems. Using fieldbus technology to construct low-cost fieldbus control systems promotes the intelligence of field instruments, the decentralization of control functions, and the openness of control systems, which is in line with the technological development trend of industrial control systems. During the Ninth Five-Year Plan period, in order to accelerate the development of fieldbus technology in my country, the country focused on the development and engineering of intelligent instruments and fieldbus technology, supplemented and improved process equipment, development devices and testing devices, established production bases for intelligent instruments and developed automation systems, and formed a moderate scale economy. In 2000, the two projects of the Ninth Five-Year Plan National Science and Technology Research and Development Program, "Research and Development of a New Generation of Fully Distributed Control Systems" and "Research and Development of Fieldbus Intelligent Instruments", were completed one after another. These two projects, along with the previously completed "Development of Fieldbus Control Systems" project, focused on tackling the HART and FF fieldbus protocols, addressing the current situation of multiple fieldbus protocols coexisting internationally. In short, the development of computer control systems, after evolving from stationary pneumatic instrument control systems, electric unit-based analog instrument control systems, centralized digital control systems, and distributed control systems (DCS), is moving towards fieldbus control systems (FCS). Although fieldbus-based FCS is developing rapidly, much work remains to be done, such as standardization and instrument intelligence. Furthermore, the maintenance and upgrading of traditional control systems still require DCS; therefore, FCS completely replacing traditional DCS will be a long process, and DCS itself is constantly evolving and improving. It is certain that FCS , combining DCS, industrial Ethernet, and advanced control technologies, will have strong vitality. Industrial Ethernet and fieldbus technology, as flexible, convenient, and reliable data transmission methods, are increasingly used in industrial settings and will occupy an increasingly important position in the control field. V. Instrumentation Technology After fifty years of development, my country's instrumentation industry has established a considerable foundation, forming a relatively complete production, research, and marketing system, moving towards digitalization, intelligence, networking, and miniaturization. Currently, there are over 6,000 instrumentation enterprises with annual sales of approximately 100 billion yuan, making China the second largest instrumentation producer in Asia after Japan. According to customs statistics, excluding instruments imported as part of complete engineering projects, imports of various instruments reached nearly US$6 billion last year, accounting for about 50% of the total output value of my country's instrumentation industry. However, most of my country's instrumentation products are currently at a low to mid-range level. As digital, intelligent, networked, and miniaturized products gradually become mainstream internationally, the gap will further widen. Currently, my country relies heavily on imports for high-end and large-scale instruments and equipment. For mid-range products and many key components, foreign products hold over 60% of the Chinese market share, while domestically produced analytical instruments account for less than two-thousandths of the global market. In March 2001, the Fourth Session of the Ninth National People's Congress approved the "15th Five-Year Plan" outline, which for the first time proposed "placing the development of CNC machine tools, instruments and meters, and basic components in an important position, and striving to improve quality and technical level." In August 2001, the State Planning Commission explicitly listed instruments and meters as important technical equipment for the national economy. The State Economic and Trade Commission formulated and promulgated the "15th Five-Year Plan" for the instrument and meter industry, establishing six high-tech industrialization projects: 1. Fully open distributed control systems and intelligent instruments based on fieldbus technology; 2. New sensors; 3. Intelligent industrial control components and actuators; 4. Environmental and pollution source monitoring instruments and automatic monitoring systems; 5. Instrument automation control systems in complete sets of process equipment for urban sewage treatment and utilization; 6. Instrument automation control systems in complete sets of rotary equipment for steelmaking converter gas purification. According to industry forecasts, the Chinese instrument and meter market during the "15th Five-Year Plan" period was approximately: 162.8 billion yuan in 2002, 179 billion yuan in 2003, 196.9 billion yuan in 2004, and 216.5 billion yuan in 2005. Over these five years, the average annual market size was 180.6 billion yuan (equivalent to 22 billion USD), with industrial automation instruments and control systems accounting for 41%, scientific testing instruments for 25%, medical instruments for 17%, and others for 17%. The average annual growth rate was no less than 10%. The main development trends of instrument and meter technology in the future are: instrument and meter development towards intelligence, resulting in intelligent instruments and meters; PC-based measurement and control equipment, with rapid development of virtual instrument technology; and networking of instruments and meters, resulting in networked instruments and remote measurement and control systems. Several suggestions: develop products with independent intellectual property rights and master core technologies; strengthen the system integration capabilities of the instrument and meter industry; further expand the application areas of instruments and meters. VI. CNC technology is developing towards intelligence, openness, networking, and informatization. CNC technology is developing towards intelligence, openness, networking, and informatization. Since the first experimental numerical control (NC) system was developed at MIT in 1952, 51 years have passed. In the past decade, with the rapid development of computer technology, various levels of open NC systems have emerged and developed rapidly. Currently, they are moving towards a standardized open architecture. In terms of structural form, NC systems in the world today can be roughly divided into four types: 1. Traditional NC systems; 2. Open NC systems with a "PC embedded in NC" structure; 3. Open NC systems with a "NC embedded in PC" structure; 4. SOFT-type open NC systems. my country's NC system development and production have made great progress through the introduction, digestion, and absorption during the Seventh Five-Year Plan, the key research during the Eighth Five-Year Plan, and industrialization during the Ninth Five-Year Plan. Key technologies have been basically mastered, NC development and production bases have been established, a group of NC talents has been trained, and a preliminary NC industry has been formed, which has also driven the development of electromechanical control and transmission control technologies. At the same time, economical NC systems with Chinese characteristics have seen significant improvements in performance and reliability over the years and are gradually being recognized by users. The overall development trend of CNC system technology abroad is as follows: the new generation of CNC systems is developing towards PC-based and open architecture; drive devices are developing towards AC and digital directions; communication functions are being enhanced, leading to networking; and CNC systems are developing towards intelligent control performance. Entering the 21st century, human society will gradually enter the knowledge economy era, where knowledge will become the capital and driving force for technological and production development. The machine tool industry, as the equipment sector for machinery manufacturing, industry, and even the entire national economic development, will undoubtedly see its strategic importance and level of attention become even more prominent. In recent years, my country's CNC machine tool industry has maintained double-digit growth. In 2001, my country's machine tool industry output value ranked 5th in the world, and its machine tool consumption rose to 3rd, reaching US$4.739 billion, second only to the United States' US$5.367 billion. In 2002, the output value reached 26 billion yuan, and the output ranked 4th in the world. However, compared with developed countries, my country's CNC machine tool rate is still not high. Currently, the CNC rate of production output value is less than 30%, and the CNC rate of consumption value is less than 50%, while developed countries are mostly around 70%. Due to the inability of domestically produced CNC machine tools to meet market demand, high-end CNC machine tools and supporting components can only be imported, causing my country's machine tool imports to rise year by year. In 2001, China's machine tool imports jumped to 2nd in the world, reaching US$2.406 billion, an increase of 27.3% over the previous year. Intelligentization, openness, networking, and informatization are becoming the main trends in the future development of CNC systems and CNC machine tools: development towards high speed, high efficiency, high precision, and high reliability; development towards modularity, intelligence, flexibility, networking, and integration; development towards PC-based and open architecture; the emergence of a new generation of CNC machining processes and equipment, with machining moving towards virtual manufacturing; the integration of information technology (IT) and machine tools, leading to the development of advanced mechatronic machine tools; nanotechnology will form a new development trend and achieve new breakthroughs; energy-saving and environmentally friendly machine tools will accelerate their development and occupy a large market share. VII. Industrial control networks will develop towards a combination of wired and wireless technologies. Since the first civilian network system, ARCnet, went into operation in 1977, wired local area networks (LANs) have achieved success and rapid development due to their wide applicability and advantages in technology and price. However, in industrial settings, some industrial environments prohibit, restrict, or make it difficult to use cables, hindering the effectiveness of wired LANs. Therefore, wireless LAN technology has been developed and applied. With the continuous development of microelectronics technology, wireless LAN technology will play an increasingly important role in industrial control networks. Wireless LAN (WLAN) technology provides a convenient way to connect network devices wirelessly, allowing people to access network resources anytime, anywhere, and freely. It represents a crucial direction for the development of modern data communication systems. WLANs can provide Ethernet interconnection functionality without the need for network cables. While driving the development of network technology, WLANs are also changing people's lifestyles. Wireless network communication protocols typically use IEEE 802.3 and 802.11. 802.3 is used for point-to-point communication, while 802.11 is used for point-to-multipoint communication. WLANs can be implemented on top of a regular LAN using wireless hubs, wireless access points (APs), wireless bridges, wireless modems, and wireless network cards (NICs), with NICs being the most widely used. Future research on WLANs will primarily focus on security, mobile roaming, network management, and its relationship with other mobile communication systems such as 3G. In the field of industrial automation, there are thousands of sensors, detectors, computers, PLCs, card readers, and other devices that need to be interconnected to form a control network. These devices typically provide communication interfaces such as RS-232 or RS-485. Wireless LAN (WLAN) devices use isolated signal converters to convert RS-232 serial signals from industrial equipment to and from WLAN and Ethernet signals. They comply with the IEEE 802.11b WLAN standard and the IEEE 802.3 Ethernet standard, and support standard TCP/IP network communication protocols, effectively expanding the networking capabilities of industrial equipment. The combination of computer network technology, wireless technology, and smart sensor technology has given rise to the new concept of "networked smart sensors based on wireless technology." These wireless-based networked smart sensors enable data from the industrial field to be transmitted, published, and shared directly over a network via wireless links. Wireless LAN technology provides high-bandwidth wireless data links and flexible network topologies for communication between various intelligent field devices, mobile robots, and automated equipment in factory environments. In some special environments, it effectively compensates for the shortcomings of wired networks, further improving the communication performance of industrial control networks. VIII. Industrial control software is developing towards advanced control . (Note: The last sentence appears to be a separate, unrelated statement and is not directly related to the preceding text.) Since its inception in the early 1980s, industrial control software has undergone 20 years of development. As an application software, industrial control software has evolved alongside the rise of PCs. It mainly includes Human-Machine Interface (HMI) software, PC-based control software, and production management software. Currently, my country has developed a number of complete application software packages with independent intellectual property rights, including real-time monitoring software platforms, advanced control software, and process optimization control software. Significant breakthroughs have been made in engineering and productization, breaking the monopoly of foreign companies in similar application software. Through application in hundreds of enterprises (plants) in industries such as chemical, petrochemical, and papermaking, these applications have promoted technological transformation, improved production process control levels and product quality, and created significant economic benefits for enterprises. In 2000, the "Ninth Five-Year Plan" national science and technology project, "Control and Computer Application Technology of Large-Scale Backbone Petrochemical Production Systems," passed acceptance. As an important component of industrial control software, significant progress has been made in the development of domestic HMI configuration software in recent years. The combination of software and hardware provides a relatively complete solution for the integrated measurement, control, and management of enterprises. Based on this, industrial control software will develop from HMI and basic strategy configuration towards advanced control. Advanced Process Control (APC) currently lacks a strict and unified definition. Generally, control algorithms based on mathematical models but requiring computer implementation are collectively referred to as advanced process control strategies. Examples include adaptive control, predictive control, robust control, and intelligent control (expert systems, fuzzy control, neural networks). Because advanced control and optimization software can generate significant economic benefits, their value has increased dramatically. Internationally, dozens of companies have launched hundreds of advanced control and optimization software products, forming a powerful process industry application software industry worldwide. Therefore, developing advanced control and optimization software with independent intellectual property rights in China, breaking the monopoly of foreign products, and replacing imports is of great significance. In the future, industrial control software will continue to develop towards standardization, networking, intelligence, and openness. Conclusion Industrial informatization refers to the process of information collection, transmission, processing, and comprehensive utilization in industrial production, management, and operation through information infrastructure and integrated platforms. During the "15th Five-Year Plan" period, the national focus on using informatization to drive industrialization was threefold: first, to improve the automation, intelligent control, and information-based management of traditional industries by emphasizing the application of electronic information technology; second, to promote high-quality and efficient production in the manufacturing sector and revitalize the equipment manufacturing industry by emphasizing the application of advanced manufacturing technologies; and third, to upgrade and improve the key technologies, common technologies, and related supporting technologies, processes, and equipment levels of key industries. The main objectives of the national high-tech industrialization strategy are twofold: first, to develop high technology, form emerging industries, and cultivate new growth points; and second, to utilize advanced technologies to transform and optimize traditional industries, thereby improving the quality of economic growth. Because vigorously developing industrial automation is an effective way and means to accelerate the transformation and upgrading of traditional industries, improve the overall quality of enterprises, enhance the overall national strength, adjust the industrial structure, and rapidly revitalize large and medium-sized enterprises, the country will continue to implement a series of special projects for the industrialization of high-tech industrialization of industrial process automation, use informatization to drive industrialization, promote the further development of industrial automation technology, strengthen technological innovation, realize industrialization, solve the deep-seated problems facing the national economic development, further improve the overall quality of the national economy and comprehensive national strength, and achieve leapfrog development.