Although the development of domestic DCS has made great progress, foreign DCS products have a high market share in the domestic market, mainly Honeywell and Yokogawa products. China's DCS market annual growth rate is about 20%, the annual market volume is about 30 (3.5 billion yuan). In the past five years, DCS has no substitute products in the petrochemical industry large-scale automatic control devices, so its market growth rate will not decline. Statistics, by 2005, there are more than 1000 sets of equipment in China's petrochemical industry that need to be controlled by DCS; the power system is equipped with more than 10 million kilowatts of generator sets every year, which requires DCS to achieve monitoring; many companies have used DCS for nearly 15 (20 years, need to update and Transformation. Therefore, the status of DCS as the main product of the automation instrument industry will not be shaken in the next five years.

According to the survey data released by the China Instrument and Meter Industry Association, the status of China's DCS market in 2002 is as follows:

Miniaturization, diversification, PC and openness are the main directions for the future development of DCS. At present, the market occupied by small DCS has gradually shared with PLC, industrial PC and FCS. In the future, small DCSs may first be integrated with these three systems, and the "soft DCS" technology will first be developed in small DCS. PC-based control will be more widely used in small and medium-scale process control, and DCS manufacturers will also launch small DCS systems based on industrial PCs. The open DCS system will extend both upwards and downwards at the same time, so that the field data from the production process can flow freely throughout the enterprise, realize the seamless connection of information technology and control technology, and develop towards the integration of measurement and control tubes.

Fourth, the control system is developing towards the fieldbus (FCS)

Due to the development of 3C (Computer, Control, Communication) technology, the process control system will be developed from DCS to FCS (Fieldbus Control System).

The FCS can completely spread the PID control into the FieldDevice. The fieldbus-based FCS is a fully-distributed, fully digital, fully open and interoperable next-generation production process automation system that will replace the on-site one-to-one 4 (20 mA analog signal line for traditional industrial automation control system systems). The structure brings revolutionary changes.

According to the definition of IEC61158, a fieldbus is a digital, bidirectional, multi-branch communication network installed between a field device in a manufacturing or process area and an automatic control device in a control room. The fieldbus enables the measurement and control equipment to have digital computing and digital communication capabilities, which improves the measurement, transmission and control accuracy of the signal and improves the function and performance of the system and equipment. The SC65C/WG6 working group of IEC/TC65 began to work on the introduction of the world's single fieldbus standard in 1984. After 16 years of hard work, IEC61158-2 was introduced in 1993, and the standard setting was later confusing. . There are eight sub-sets of IEC61158 fieldbus international standards announced in early 2000, namely:

Type 1 IEC Technical Report (FFH1);

Type 2 Control-NET (supported by Rockwell, USA);

Type 3 Profibus (supported by Siemens, Germany);

Type 4P-NET (supported by ProcessData, Denmark);

Type 5FFHSE (formerly FFH2) high speed Ethernet (supported by FisherRosemount, USA);

Type 6 Swift-Net (supported by Boeing, USA);

Type 7WorldFIP (supported by Alsto, France);

Type 8 Interbus (supported by PhoenixContact, USA).

In addition to the eight fieldbuses of IEC61158, IECTC17B has adopted three bus standards: SDS (SmartDistributedSystem); ASI (ActuatorSensorInterface); DeviceNET. In addition, ISO has published the ISO11898CAN standard. Among them, DeviceNET was approved as a national standard by China on October 8, 2002, and was implemented on April 1, 2003.

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