Abstract:The use mode of the auxiliary control system is studied in a certain power plant, and the market status and investment situation of the control system using PLC and DCS are reported. It is demonstrated that the auxiliary control system has the advantage of using the same DCS as the host control system. The power plant began to plan water, coal, ash, desulfurization and other systems in the same way as the DCS of the host control system during the bidding period. The control system of the power plant is divided into 3 network segments through the Ethernet network address different settings: No. 1 unit and public network, No. 2 unit network, auxiliary network control, the control system realizes data transmission through the redundant Gigabit backbone switch Core. The integration of control and data is realized. At the same time, the advantages of the centralized monitoring scheme are demonstrated. Therefore, it is decided to adopt the monitoring layout of the centralized control + auxiliary network set control. Operations staff corresponding is divided into the host operation department and the comprehensive operation department. In these 2 centralized control rooms, the management model is optimized. The network structure of DCS and the way of data exchange are expounded. Finally, it shares the experience of integration construction, and has certain promotion value