Honeywell ST700 - Page 9

Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page ix
Term Definition
Pr Reduced pressure
Proportional Integral
Derivative control
A standard control algorithm. Also refers to a PID function block.
PSI Pounds per Square Inch
PSIA Pounds per Square Inch Absolute
Pu Static pressure at upstream point
PV Process Variable
PWA Printed Wiring Assembly
RFI Radio Frequency Interference
RTD Resistance Temperature Detector
Stack The software component that implement the Foundation Fieldbus
communications protocol specifications, including FMS, FAS, DLL, SM and
NM.
Status A coded value that qualifies dynamic variables (parameters) in function blocks.
This value is usually passed along with the value from block to block. Status is
fully defined in the FF FBAP specifications.
STIM Pressure Transmitter Interface Module
STIMV IOP Pressure Transmitter Interface Multivariable Input / Output Processor
System Management
Provides services that coordinate the operation of various devices in a
distributed fieldbus system.
System Management
Agent Part of the device software that operates on system management objects.
System Management
Information Base
A collection of objects and parameters comprising configuration and
operational information used for control of system management operations.
TAC Technical Assistance Center
Trim Point A selected reference point at which a measurement is calibrated.
URL Upper Range Limit
URV Upper Range Value
US Universal Station
Vac Volts Alternating Current
Vdc Volts Direct Current
Virtual
Communication
Reference
A defined communication endpoint. Fieldbus communications can primarily
only take place along an active communications "path" that consists of two
VCR endpoints.
Virtual Field Device A logical grouping of "user layer" functions. Function blocks are grouped into a
VFD, and system and network management are grouped into a VFD.
For example, to establish communications between a transducer block and a
function block, a VCR must be defined at the transducer block and a VCR
must be defined at the function block.