Application of PLC, DCS and FCS in metallurgical process control

In metallurgical production, the process control system completes the detection, display, recording, adjustment, control, alarm and other functions of the generated process parameters. play an extremely important role. Its characteristic is to control the real-time production process, the control process is complicated, the process lags behind, there are many monitoring parameters and data changes, and the data processing and storage volume is large. According to the characteristics of the process control system and the control requirements of different production processes, the application of different control systems can complete the production tasks in a safe, reliable and cost-effective manner. At present, domestic advanced large and medium-sized process control systems basically adopt PLC and DCS. ( Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 Analog Input Module, B&R X20do6322 Digital Output Module, Allen Bradley 1756-PB72 Power Supply Module, Siemens 6ES7331-7NF10-0AB0 Analog Input Module) The following briefly analyzes the different application characteristics and selection principles of PLC, DCS and FCS in the process control of small and medium-sized metallurgical production. Features of various control systems :

1. The main characteristics of the PLC system are: reliable operation, fast operation speed; building block structure, flexible combination; good compatibility; simple and rich programming and generation; strong network function. The PLC system can well complete industrial real-time sequence control, condition control, counting control, step control and other functions; it can complete analog/digital (A/D), digital/analog (D/A) conversion, data processing, communication networking , real-time monitoring and other functions.

2. DCS has the following main features: complete functions; network communication technology; complete open system; high reliability;

3. FCS mainly has the following characteristics: highly decentralized system structure; strong interoperability; data validity and integrity; strong controllability; high security; flexible expansion.

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Vivi (sh_plc@163.com).