Application Research On ControlNet Fieldbus System For The Production Of MgCl₂

FieldBus is one of the most hot spot technologies in the modern automation field. The FieldBus technology possesses such advantages as opening characteristic, interoperability, intelligence ability and high dispersivity of system structure. Motivated by these inherent advantages, Fieldbus has been applied in industry control system frequently, and Fieldbus control system is formed.In this thesis, ControlNet Fieldbus is analyzed systematically and the method of Fieldbus system design is introduced. Based on the analysis of MgCl₂ production craft, the ControlNet Fieldbus control system for the production of MgCl₂ is designed, which is applied in a factory successfully. The network platform of ControlNet combined with DeviceNet Fieldbus is applied in the system, which ensures system communication stability and improves the performance of system network. Note that the plant is inflammable and explosive easily, Ex i Explosion-Proof system as well as Redundancy system is designed. Considering that the craft demands very high control precision on process variables, such as level, flow and temperature, software system based on PID and fuzzy PID algorithm is designed.Proved by system running, the system works well. ControlNet Fieldbus System for the Production of MgCl₂ is a successful example of Fieldbus system application.