Installation manual

Glossary
194
Installing and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
Plant Management Area ( PMA)
A collection of plant process areas
(PPAs). A PMA controls the console point
reporting load, and indirectly, central
processing unit (CPU) loading.
Plant Process Area (PPA)
Within a process-control system, a
collection of equipment that uses a
common alarm strategy.
PMA
Acronym: Plant Management Area
Point
A set of process-control parameters and
data. The makeup and structure of each
point depends on its role in collecting and
reporting data and the type of device in
which the point resides. Points are the
most important logical units of a process
control system; the number of point s is a
measure of the system’s size an d
sophistication.
Primary Control Algorithm (PCA)
The principle control equation of a
continuos loop in a PROVOX system.
The PCA type and station (STA) type
defined during configuration determine
the main functionality of a point.
PPA
Acronym: Plant Process Area
Pro cess
A user-initiated action that affects or
accesses a database. Each process
represents one connection to the server.
An ENVOX user typically has three to five
processes active at once. Adding a point,
generating files, and downloading files
are examples of processes. The ENVOX
administrator can determine which users
have initiated which processes and can
also kill processes.
Pro cess Variable (PV)
In process control, a measurable quality
or quantity whose change can cause
other changes in the process, or make
such changes possible. Common
process variables are temperature,
percent full, and rate of flow. The term
measured variable is a synonym.
PROFLEXÒ Software
A Fisher--Rosemount Systems’ line of
configuration software products for
PROVOX syste ms. ASCII text files are
the principal distinguishing feature of
configuration through a PROFLEX
device.
PROVOXÒ Process Contro l Products
The Fisher--Rosemount Systems’ line of
process control products used in
PROVOX process measurement
systems. It is a distributed control and
data acquisition system that
communicates over a data highway.
PROVOX Display Format (PDF)
ASCII-based format used for operator
screen displays on PROVOX system
consoles.
PROVUEÒ Console
The Fisher--Rosemount Systems’ line of
console products for PROVOX systems
that use a global database configuration
and have high--resolution graphics,
ergonomically designed keyboards, and
color printers.
Register
A memory location for temporary storage
of a value.
SAM
Acronym: System Administration
Manager (The HP-UX system
administration utility)
Glossary