The distributed control system is abbreviated as DCS, which can also be directly translated as "distributed control system" or "distributed computer control system". It adopts the basic design idea of decentralized control, centralized operation and management, and adopts a multi-level, cooperative and autonomous structure. Its main feature is its centralized management and decentralized control. At present, DCS has been widely used in electric power, metallurgy, petrochemical and other industries.

DCS usually adopts a hierarchical structure, as shown in Figure 3.1. Each level is composed of several subsystems, each of which achieves a number of specific limited goals, forming a pyramid structure.

Reliability is the life of DCS development. There are three main measures to ensure the high reliability of DCS: first, widely use the hardware equipment and production process with high reliability; Second, redundancy technology is widely used; The third is to widely implement fault tolerance technology, fault self diagnosis and automatic processing technology of the system in software design. Nowadays, the MTBF of most distributed control systems can reach tens of thousands or even hundreds of thousands of hours.

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