Foundation Fieldbus Technology
FOUNDATION fieldbus is a real-time digital communication network designed specifically for process control applications for connecting instruments like transmitters, analyzers, control valve positioners, and on/off valves to distributed control systems DCS, PLC and other automation systems.
Some of the advantages in FOUNDATION fieldbus are the smallest hardware, all-digital solution from the sensor to actuator. One of the most important capabilities in this system is taking the place of proprietary protocols previously used with control valves, MOV, gas chromatographs, and tank gauging systems.
Communication is time-synchronized and scheduled to ensure deterministic closed loop digital control. It can support long cable lengths to junction boxes far into the field, as well as long spurs for devices. Fieldbus-based control systems employ two-wire twisted pair cable and provide intrinsically safe or non-incentive device power suitable for all hazardous areas.
Unlike other digital architectures, FOUNDATION fieldbus was designed from the ground up to enable control-in-the-field (CIF) strategies across the plant.
FOUNDATION H1 is special bus for process control with 31.25 kbit/s data transfer speed, it can connect all interconnects devices such as transmitters and actuators on a field network. H1 is designed to operate on existing twisted pair instrument cabling with power and signal on the same wire supports Intrinsic Safety (IS) applications.
High Speed Ethernet (HSE) is a digital high speed bus worked on 100 Mbit/s, the technology is designed for device, subsystem and enterprise integration supports the entire range of fieldbus capabilities, including standard function blocks and Device Descriptions (DDs).
Function Block Model
A unique characteristic of the Foundation architecture for ensuring interoperability is its use of a fully specified, standard User Layer based on "Blocks" and Device Descriptions (DDs). The User Layer defines a Function Block Application Process (FBAP) using Resource Blocks, Function Blocks, Transducer Blocks, System Management, Network Management and DD technology.