DCS (Distributed Control System): A multi-level computer system composed of process control and process monitoring levels, linked by a communication network. It integrates computer technology, communication technology, display and control technologies, and its design philosophy is distributed control, centralized operation, hierarchical management, flexible configuration, and convenient configuration. Since its introduction in 1975, DCS systems have achieved considerable adoption in developed countries over the past thirty years. Currently, China's DCS market is in a period of growth and development, attracting global DCS manufacturers to focus on the Chinese market and engaging in fierce competition. I. Development Status and Market Analysis of Domestic DCS China's DCS development started relatively late, with technology imports and independent research and development only beginning in the late 1980s, gradually leading to widespread adoption. In the early stages of development, due to outdated manufacturing processes and incomplete mastery of core technologies such as redundancy, the systems were unstable in application, lacked real-time performance, and had significant gaps in hardware and software performance compared to imported systems. For many years, the basic structure of China's DCS system market has been that domestic DCS systems compete with foreign DCS systems in the small and medium-sized engineering market, while the market for major engineering projects is monopolized by foreign DCS systems. In recent years, domestically produced DCS systems have gradually gained an advantage in the small and medium-sized engineering project market due to their higher performance-price ratio and better service. With domestic DCS manufacturers continuously absorbing foreign technologies and improving system software and hardware, coupled with the rapid development of computer, communication, and control technologies, domestic DCS systems have developed rapidly and matured significantly in recent years. They are now widely used, with levels approaching or reaching those of similar international products. The application and promotion of domestically produced DCS systems has progressed from small and medium-sized projects to large-scale projects, and from the main application areas of petrochemical, chemical, power, and metallurgical industries to the entire industrial sector, including municipal, food, building materials, environmental protection, and transportation. In expanding the market and entering the large-scale engineering project market, the following issues need to be addressed: 1. User Trust: As engineering projects become larger, the role of the control system becomes increasingly important. The requirements for the stability and reliability of the control system are becoming increasingly stringent. In fact, the current gap between domestic and foreign DCS systems is not in technology, but mainly in production management and quality management. Compared with well-known foreign companies, we still lack experience in this area. However, by taking each application seriously, domestically produced DCS systems can gradually gain recognition from users. 2. Design Details and Application Solutions: After domestically produced DCS systems enter the large-scale engineering project market, price competition will be relatively weaker. With the overall technical levels of various systems being roughly the same, users will evaluate the system based on its detailed design. From the user's perspective, a DCS supplier should provide not just a product, but a complete solution. Therefore, when evaluating a DCS system, users should not only evaluate the hardware and software, but also, importantly, whether the system's application meets their needs. 3. Application and Development of New Technologies: While domestically produced DCS systems have reached a level comparable to foreign systems in terms of overall technical capabilities, they must keep pace with foreign systems in the application and development of new technologies, such as fieldbus and wireless communication technologies. II. Development History and Characteristics of Keyuan DCS Systems: From 1993 to 1996, Keyuan DCS was in its initial and early accumulation phase. Based on its research, development, production, and sales of automation instruments, and in accordance with the development trend of thermal automation technology, Keyuan independently developed the NT2000 distributed control system, completing the initial development and accumulation of DCS systems. From 1997 to 2002, Keyuan's DCS system entered a period of stable development. Through continuous communication with a wide range of customers and experts in the industry, Keyuan clearly realized that DCS would eventually replace conventional instruments. Therefore, it accelerated the pace of DCS upgrades and development. Given the relatively backward domestic manufacturing processes at the time, and limitations in computer, communication, and control technologies, the hardware quality lagged significantly behind imported DCS systems. At the end of 1997, a strategic partnership was formed with Eurotherm of the UK, with them acting as Keyuan's hardware supplier, providing DPU and I/O module hardware. Combined with Keyuan's independently developed thermal power plant automation control software, the NETWORK-6000 distributed control system was successfully developed in 1997. This system passed the scientific and technological achievement technical review by the expert group of the State Power Planning & Engineering Institute. From 2003 to the present, Keyuan's DCS has entered a period of rapid development. To enhance its market position in the thermal automation field, Keyuan Automation, based on its independently developed NT2000 distributed control system, adopted some imported components to rapidly capture market share, laying a solid product foundation for the company's rapid development and achieving a high market share. With the company's enhanced technological strength and in response to the national requirements for the localization of major technical equipment, Keyuan completed the upgrade of the NT2000 in 2007, initially forming the NT6000 distributed control system with completely independent intellectual property rights, and receiving funding from the Jiangsu Provincial Major Scientific and Technological Achievements Industrialization Special Fund. Currently, the NT6000 distributed control system has achieved numerous successes in industries such as dry quenching (CDQ) power generation, cement kiln pure low-temperature waste heat power generation, blast furnace gas power generation, circulating fluidized bed control systems, straw incineration power generation, waste incineration power generation, and the automation control of production processes in chemical, metallurgical, papermaking, and glass industries. Simultaneously, significant progress has been made in the research and development of products or solutions specifically for automation in industries such as metallurgy and coal mining, and these will be gradually launched into the market. Features of the Koyo NT6000 Distributed Control System: The NT6000 distributed control system adopts high-standard design and extensively utilizes internationally advanced and mature technologies. The system design is based on an open approach, with the DPU employing a low-power POWER PC, modular I/O, and a powerful operator station, providing a complete solution for distributed control systems. Koyo also applies its research findings on complex power generation processes to the NT6000's control algorithm design, solving control challenges for complex objects with multiple variables, nonlinearity, time-varying characteristics, and time lags. In particular, it can achieve targeted optimization control to achieve "energy saving" and "emission reduction" goals. The NT6000 also provides solutions for fieldbus, virtual DCS, and information integration technologies. The application of the NT6000 will effectively improve the automation and informatization level of domestic process industries, providing control technology guarantees for the "energy saving and emission reduction" cause. System Features: ◆ Distributed Functional Design: Important system functions and applications are distributed to various independent stations, ensuring that a failure at one point will not affect the normal operation of the system, truly achieving risk dispersion. ◆ Simplified Hardware and Software Design: The system adopts currently popular industrial-grade hardware, software, network, and communication interfaces. This system replaces the traditional closed and patented DCS structures. ◆ Redundant design ensures maximum reliability—the controller, I/O, network, and power supply are all redundantly designed. ◆ Comprehensive system diagnostics—the system I/O, network, controller, and power supply all have indicators and diagnostics. ◆ Simple and easy-to-learn configuration—the system provides a configuration method compliant with IEC-1131-3 standards. ◆ Open design-based system—flexible system expansion, providing a flexible platform. ◆ The DPU has multi-task allocation capabilities, allocating different tasks to the DPU processing cycle according to data processing and control function requirements, making rational use of DPU resources. It also has automatic time synchronization, maintaining time synchronization with the system's master clock. ◆ Online configuration functionality is provided, allowing real-time modification of the control configuration without affecting the normal operation of other control logic in related controllers. ◆ The configuration software can export and print control strategies in standard SAMA diagram format. ◆ Provides various fieldbus communication interfaces such as Modbus RTU, Modbus TCP, Profibus DP, and HART, enabling fieldbus-enabled transmitters, actuators, electrical protection devices, and other equipment to directly connect to the DCS without intermediate conversion steps. ◆ Provides optimization algorithms for regulating system setting parameters. ◆ Develops specialized fieldbus control modules for the control needs of thermal power plants, such as electrical protection modules, motor/electric gate/regulating gate control modules, and electrical contact water level measurement modules. These modules all have standard fieldbus interfaces, conform to fieldbus hardware standards, can be deployed in industrial fields, and seamlessly connect with the control system. Fieldbus solutions greatly improve the integration of control systems, reduce system investment, and lay the foundation for the implementation of digital power plants. III. DCS Development Trends: The technologies involved in the basic architecture of DCS systems are already very mature. As users become more familiar with DCS applications and development, prices are becoming more transparent, and profit margins are becoming thinner. Driven by the development of information technology (network communication technology, computer hardware technology, embedded system technology, fieldbus technology, various configuration software technologies, database technology, etc.) and the increasing demand from users for advanced control and management functions, DCS manufacturers will inevitably improve the technical level of their DCS systems and continuously enrich their content, further expanding DCS applications. 1. Data Optimization and Information Management: Real-time field data collected by the DCS will be further processed using advanced database and communication technologies, combined with the user's actual processes, to provide greater added value. One approach is to provide optimization software for specific processes, enabling users to improve production efficiency and economic benefits; another is to add functionality, including: equipment maintenance functions, more detailed analysis of equipment thermal stress and mechanical fault status, and determination of equipment maintenance needs by monitoring equipment operating status, reducing unexpected downtime and improving equipment utilization; yet another approach is to integrate with the user's management system, participating in the user's plant-wide information system. For example, providing SIS (Signal Information Monitoring System) and MIS (Management Information System) to help users improve their management level. 2. Fieldbus Technology Application: With the development of current fieldbus technology and the increasing number of field instruments with fieldbus communication capabilities, DCS suppliers have developed field interfaces for various fieldbus communication protocols. The communication between DCS and field instruments goes beyond simply transmitting measurement data; it also involves transmitting a large amount of information expressing instrument status, parameters, and management aspects, and even "decentralizing" simple control functions to field instruments. 3. DCS Enters a Low-Cost Era: In the 1980s and 1990s, DCS was a high-tech, relatively complex, and expensive industrial control system. With its widespread application and the improvement and further expansion of domestically produced DCS systems, DCS has become less mysterious and a familiar, reasonably priced standard control product. 4. DCS Applications Become More Open: The development of network, database, software, and fieldbus technologies has made open systems possible. Increased competition among DCS manufacturers has promoted specialization and cooperation. Manufacturers have abandoned their original independent development model and adopted an integrated and collaborative development model, thus automatically achieving system openness. 5. Specialization of Industry Solutions and Services: With the development of open systems and platform technologies, product selection has become more flexible, and software configuration functions are becoming increasingly flexible and powerful. Each specific application requires a complete solution, so specialized application knowledge and engineering experience will be key to the success of industrial automation manufacturers or system integrators in the future. While promoting the advantages of DCS technology, DCS manufacturers are also actively promoting their industry solution design and implementation capabilities, providing more specialized solutions and services to different users.