Problems in the DCS system - Solutions - Huaqiang Electronic Network

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The dcs system is a large-scale automatic control system besides plc. It is widely used in the fields of chemical industry and thermal power, but the demand for automation technology in production is further improved. The traditional DCS system can not meet the needs and needs to be upgraded.

The DCS system is controlled by multiple computers to control multiple control loops in the production process, and at the same time, it can centrally acquire automatic control systems for data, centralized management and centralized control. The distributed control system uses a microprocessor to control each loop separately, and uses a small and medium-sized industrial control computer or a high-performance microprocessor to implement the upper level of control.

After years of continuous application, some limitations of DCS system development in the industry are gradually reflected, DCS problems:

11 to 1 structure. 1 instrument, 1 pair of transmission lines, 1 signal transmitted in one direction. This structure results in complicated wiring, long engineering cycle, high installation cost, and difficult maintenance.

2 poor reliability. Analog signal transmission is not only less accurate, but also susceptible to interference. Various measures have been taken to improve the anti-interference and transmission accuracy, resulting in an increase in cost.

3 out of control status. The operator does not know the working condition of the on-site analog instrument in the control room, nor can it adjust the parameters, nor can it predict the accident, causing the operator to be out of control. Because the operator can't find the fault of the on-site instrument in time, it is not uncommon for an accident to occur.

4 Interoperability is poor. Although analog meters have unified 4 to 20 mA signal standards, most of the technical parameters are still determined by the manufacturer, resulting in different brands of instruments can not be interchanged. As a result, users rely on manufacturers, can not use the best cost-effective matching instruments, and even the situation of individual manufacturers monopolizing the market.