As the name implies, the decentralized control system is to centralize the display and operation of valves, instruments and pumps scattered in the chemical field in the control room for unified management. The main functions are as follows:

1. Status display. (such as the display of medium flow in the pipeline)

2. Production and operation. (such as the switch of a valve)

3.PID control is put into use.

4. Logical function operation. (For example, the realization of chain logic and sequence control functions)

5. Alarm information management. (such as high level alarm, etc.). )

6. Authority management. (For example, different personnel have different operating rights, which is also a significant difference from PLC).