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DCS is a highly integrated product of computer technology, control technology and network technology. DCS usually uses several controllers (process stations) to control many control points in a production process. Each controller is connected through network and can exchange data. The operation adopts computer operation station, which is connected with the controller through the network to collect production data and convey operation instructions. Therefore, the main characteristics of DCs can be summed up in one sentence: decentralized control and centralized management.

Hierarchical control system

It is graded vertically and horizontally.

The simplest DCS system is divided into two levels at least in the vertical direction, namely, operation management level and process control level. In the horizontal direction, the process control levels are coordinated with each other. They send data up to the operation management level and receive instructions from the operation management level. Data exchange is also conducted among the levels. The larger the DCS system, the wider the range of vertical and horizontal classification.

The advantage of hierarchical control system is that each level has its own division of labor scope, and there is coordination between them. Usually, this coordination is completed by the upper level.

decentralized control

Decentralization is an important feature of DCS.

Decentralized means not only decentralized control, but also other meanings. Such as geographical dispersion, function dispersion, equipment dispersion, danger dispersion, etc. The purpose of dispersion is to disperse hazards and improve the availability of equipment.

Autonomy and coordination

Each component of DCS is an autonomous system, which performs its own functions, has connections with each other, exchanges data and information, restricts each other under various conditions, and works under the coordination of the system.

The distributed process control device completes the functions of data acquisition, signal processing, calculation and data output. The operation management device completes the functions of data display, operation monitoring and control signal transmission. The communication system completes the communication between the operation management device and the decentralized process control device.

The basis of decentralization is that the decentralized system is an autonomous system; The basis of hierarchical classification is that the graded system is coordinated.

Basic structure of DCS

CS control system includes distributed process control device, operation management device and data communication system.

DCS distributed control system for industrial automatic control, a comprehensive introduction to DCS

Distributed process control device

It is the interface between the distributed control system and the production process. Various variables of the production process are transformed into operation monitoring data through the decentralized control device, and various operation information is also sent to the actuator through the decentralized control device. In the distributed control station device, the analog quantity and digital quantity are converted to each other, various operations of the control algorithm are completed, and relevant software filtering and other operations are carried out for the input quantity and output quantity.
It is the interface between the operator and the distributed control system. The operator understands the operation status of the production process through the operation management device, and sends operation instructions to the production system through it. Various parameters of the production process are displayed on the operation management device to facilitate the monitoring and operation of operators.
It includes operator station and engineer station to complete the operation and configuration of the system. And plant management information system (MIS), which is a higher-level application of DCS.