Fieldbus Foundation FF (Fieldbus Foundation) is based on the ISO/OSI open system interconnection model, taking its physical layer, data link layer, and application layer as the corresponding layers of the FF communication model, and in the application A user layer is added to the layer. The user layer mainly targets the needs of automated measurement and control applications, defines unified rules for information access, and uses device description language to define a common set of function blocks. The main technical content of the Foundation fieldbus includes the FF communication protocol, the communication stack used to complete the layer 2-7 communication protocol in the open interconnection mode, the DDL device description language used to describe device characteristics, parameters, attributes and operating interfaces, and the device description language. Description dictionary, functional blocks used to realize functions such as measurement, control, and engineering quantity conversion, system software technology to realize system configuration, scheduling, management and other functions, and system integration technology to build integrated automation systems and network systems.