Installation manual

191
Glossary
Installin g and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
Dump Device
A tape or disk device to which a
database and its associated transaction
log can be copied to usually for backup
purposes.
ED
Acronym: Emergency Download
Emergency Download
A download from a special download file
while the SYBASE server is not available
or if the ENVOX database is suspect.
Engineering Units (EU)
The units of measurement for percentage
values of an analog process variable.
Possible examples are gallons per hour,
degrees Celsius, and pounds per square
inch. The low (0 percent) and high (100
percent) engineering unit limits define the
anticipated range of the variable. For
example, low and high engineering-unit
values of 50 and 1550 might define a
range for degrees Fahrenheit. In this
example, the EU span would be 1500
degrees; each percent of the EU span
equals 15 degrees.
ENVOXr Software
A Fisher--Rosemount Systems’ line of
configuration products for PROVOX
systems. The use of a third--party
relational database is the principle
distinguishing feature of configuration
with ENVOX software.
ENVOXDB Database
The default user database which stores
all configuration data and is created by
ENVOX software upon ENVOX
installation.
envox_readonly Database
An ENVOX system database containing
reference data which is used by all of the
ENVOX user databases in the system.
The database is created by ENVOX
software upon ENVOX installation.
Exception
A type of unsolicited reporting: the
reporting device sends a new value only
if the sample period has expired and the
value has changed significantly since the
last transmission.
Export
The extraction of ENVOX configuration
data and placing it in CDV files.
Export Set
CDV files prepared for import to an
ENVOX database.
FST
Acronym: Function Sequence Table
Function Sequence Table (FST)
A list of controller instructions to perform
specific logical and mathematical
operations, in a specific order. An FST
resembles a sequence of programming
subroutines, but defining an FST does
not involve actual computer
programming.
Glossary