Customizing fieldbus function blocks

摘要

Beyond enabling communication and control in the field, FOUNDATION fieldbus places built-in calculation capability into field devices, allowing manufacturers to develop customized function blocks in their devices to meet users' needs. Allowing field devices to perform higher-level calculations adds to the advantages of distributed control. Function block programming inside devices makes that easier for a variety of applications, including production estimation and wet gas measurement. A brief refresher on fieldbus systems provides context for these application advantages. A fieldbus system is a local area network (LAN) for instruments used in process automation. The LAN is composed of field devices and control and monitoring equipment integrated into the physical environment of the process facility, providing computing power across the network. This distributed intelligence allows for fundamental regulatory control, sequencing and customized calculation routines, while still allowing operation and tuning from the control room using digital communication.