Distributed control system is a new generation of instrument control system based on microprocessors and adopting the design principles of decentralized control functions, centralized display operation, taking into account division, autonomy and comprehensive coordination. Distributed control system is referred to as DCS, which can also be translated as "distributed control system" or "distributed computer control system".

In terms of structure, DCS includes process level, operation level and management level. The process level is mainly composed of process control station, I/O unit and field instrument, and is the main implementation part of the system control function.

Advanced control technology

The biggest feature of DCS in control is that it can realize diversified control strategies to meet the needs of different situations by relying on the flexible configuration of various control and calculation modules, making it easy to realize quite complicated and complicated proposition in the unit combination instrument.

With the requirements of high flexibility and high efficiency put forward by enterprises, the control scheme based on the classical control theory has been unable to adapt. After the introduction and successful application of the advanced control strategy represented by the multivariable predictive control, the advanced process control has been widely concerned by the process industry.

It should be emphasized that the wide application of various advanced control and optimization technologies is the most effective, direct and valuable development direction to excavate and improve the comprehensive performance of DCS.