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09 April 2001

Terminology

Backup link active scheduler
On each segment, a process runs called the link active scheduler. It's the time keeper and scheduler of the segment and gives FF determinism. If it fails, backup link active scheduler takes over. It resides in one of the field devices. It gives FF a unique level of fault tolerance.

BDO
butanediol

BP
British Petroleum

DCS
distributed control system

FF
Foundation fieldbus technology

H1
hunk one, the 32-kilobit, low-power-signaling FF technology based on ISA 50

H2
hunk two, the 1-2.5 megabit per second high-speed FF technology

I/O
input/output

JB
junction box

P&ID
piping and instrumentation diagram

PID
proportional, integral, derivative control algorithm