Installation manual

193
Glossary
Installin g and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
Logical Device
A designated area on a disk for
databases and transaction logs. A
database and its associated transaction
log should be on separate physical
devices, if possible. Logical devices are
used on VMS systems, AIX systems, and
some HP systems.
Logical Volume
Designated areas mapped by the
operatin g system across one or more
disks for databases and transaction logs.
Logic Control Point (LCP)
A PROVOX point type for a n advanced
batch or multifunction controller, such as
a UOC or IFC. A role for a multivariable
point, an LCP calls a programmed
subroutine defined by an FST. As
configured, the LCP activates the FST in
a continuous loop, as a single shot
program, or as required as part of a
contro l loop.
Loop
1. A control loop.
2. A PROVOX point type. A loop point
provides control for a continuous
process. Loop points have many
attributes, so can provide very
sophisticated control. Bias or ratio factors
often can be added to loop points.
Master Database
The central database which holds details
of all of the other databases. It is created
by SYBASE when SYBASE is installed.
Migrate
The process of converting PROFLEX
configuration data into CDV file forma t,
from which the data can be imported into
an ENVOX database
Model Database
The database which is used as the basis
for a new database. It is created by
SYBASE when SYBASE is installed.
Null
Having no assigned value. In a CDV file,
null is represented as two commas with
zero or more spaces in between.
OpenVMS
A mark of Digital Equipment Corporation
for one of the firm’s computer operating
systems; an acronym f or Open Virtual
Memory System. OpenVMS provides an
operating environment for technical
applications of VAX computers and
certain other compute r systems.
Operand
1. In the language editor, a value that
modifies or qualifies a function.
2. In ASCII configuration source file s, an
expression, a simple operand, a phrase
list, or an operand list.
Operation
[See Unit Operation]
Operator Workplace Console
(WPCON)
The PROVOX console products that are
used in the PROVOX operator workplace
concept. The consoles use a global
database configuration and have
high-resolution graphics, ergonomically
designed keyboards, and colo r printers.
PDF
Acronym: PROVOX Display Format
Glossary