DCS system is a major automation control system besides PLC. It is widely used in chemical industry, thermal power and other fields. However, the automation technology needs to be further improved in production. The traditional DCS system can no longer meet the need and need to be upgraded.
DCS system consists of multiple computers, respectively, control the production process of multiple control loops, but also focus on access to data, centralized management and centralized control of the automatic control system. Distributed control system uses microprocessors to control the various circuits, respectively, and the use of small and medium sized industrial control computer or high-performance microprocessor implementation of the previous level of control.
After these years of continuous application, DCS system in the development of some of the limitations of the industry gradually emerged, DCS problems:
(1) 1 to 1 structure. 1 instrument, a pair of transmission lines, one-way transmission of a signal. This structure leads to complicated wiring, long construction period, high installation cost and maintenance difficulties.
(2) poor reliability. Analog signal transmission is not only less accurate, but also susceptible to interference. Various measures have been taken to improve the immunity and transmission accuracy for this purpose, with the result of increased costs.
(3) out of control state. Operators in the control room neither understand the working condition of the on-site simulation instrument, nor can it adjust parameters, but also can not predict the accident, causing the operator to run out of control. It is not uncommon for an operator to fail to detect on-site instrument faults in time.
(4) poor interoperability. Although the analog instruments have unified 4 ~ 20mA signal standard, most of the technical parameters are still custom by the manufacturer, resulting in different brands of instruments are not interchangeable. As a result, users rely on the manufacturing plant, can not use the best cost-effective supporting instrumentation, and even individual manufacturers monopolize the market situation.
Direction of development
DCS development has been quite mature and practical, no doubt, it is still the mainstream of current industrial automation system applications and selection, not with the emergence of fieldbus technology and immediately exit the scene of the process control. In the face of challenges, DCS will continue to move forward along the following trends:
(1) To the general direction: the development of standardized data communication links and communication networks, the large single system (multi-loop) regulator, PLC, industrial PC, NC and other industrial equipment to meet the requirements of factory automation and Adapt to the open trend.
(2) Development in the direction of intelligence: the development of database system and reasoning function, especially the application of knowledge base system (KBS) and expert system (ES) such as self-learning control, long distance diagnosis, self-seeking, Will be achieved at all levels of DCS. Similar to the FF fieldbus, microprocessor-based smart devices such as intelligent I / O, PID controllers , sensors, transmitters, actuators, HMIs and PLCs have emerged.
(3) DCS Industrial PC: DCS has become a major trend by the IPC, PC as a DCS operating station or node machine has been very common, PC-PLC, PC-STD, PC- Become a DCS hardware platform.
(4) DCS specialization: DCS is more suitable for the corresponding field of application, we must further understand the corresponding professional technology and application requirements, in order to gradually form, such as nuclear power DCS, substation DCS, glass DCS, cement DCS.
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