High reliability
Since the DCS disperses the system control functions on each computer, the system structure adopts a fault-tolerant design, so the failure of one computer does not cause the loss of other functions of the system. In addition, since the tasks undertaken by the computers in the system are relatively simple, a dedicated computer having a specific structure and software can be used for the functions to be implemented, so that the reliability of each computer in the system is also improved.
Openness
DCS adopts open, standardized, modular and serialized design. Each computer in the system uses LAN to communicate and realize information transmission. When it is necessary to change or expand the system function, the newly added computer can be easily connected to the system communication network or Removing from the network hardly affects the work of other computers in the system.
flexibility
The configuration software is used to configure the software and hardware according to different process application objects, that is, to determine the measurement and control signals and the relationship between them, to select the applicable control rules from the control algorithm library, and to call the basic graphics composed from the graphics library. Monitoring and alarm screens make it easy to construct the required control system.
Easy to maintain
The single-function small or micro-dedicated computer has the characteristics of simple and convenient maintenance. When a certain part or a certain computer fails, it can be replaced online without affecting the operation of the whole system, and the fault can be quickly eliminated.
Coordination
Each workstation transmits various data through the communication network, and the entire system information is shared and coordinated to complete the overall function and optimization of the control system.
Complete control functions
The control algorithm is rich, integrating continuous control, sequential control and batch control. It can realize advanced control such as cascade, feedforward, decoupling, adaptive and predictive control, and can easily add the special control algorithm required. The DCS is very flexible and can be composed of a dedicated management computer station, an operator station, an engineering station, a recording station, a field control station, and a data acquisition station. It can also be composed of a general-purpose server, an industrial control computer, and a programmable controller. The process control level at the bottom layer generally implements data acquisition and control on-site by distributed field control stations, data acquisition stations, etc., and transmits them to the production monitoring level computer through the data communication network. The production monitoring level performs centralized operation management on data from the process control level, such as various optimization calculations, statistical reports, fault diagnosis, and display of alarms. With the development of computer technology, DCS can achieve more advanced centralized management functions such as scheduling, warehouse management, and energy management by connecting to higher-performance computer equipment as needed.
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