Installation manual

Glossary
196
Installing and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
Tuning Parameter
A parameter adjustable without
reconfiguration; an operator adjusts such
a parameter to alter control effects.
Common examples are gain, rate, reset,
and alarm trip points. Such parameters
appear in detail displays.
Unit
1. A defined group of specific process
equipment that processes a particular
batch. For control purposes, such a unit
is one entity.
2. A PROVOX point type. A unit point has
many attributes, enabling it to control the
execution of a unit operation.
Unit Op eration
In batch control, a list o f controller
instructions to perform specific
mathematical and logical functions, as
part of a time-and-event sequence for a
defined set of equipment (the unit). A unit
operation consists of phases, each of
which is a set of related steps. Each step
is an elemental control action.
UOC
Acronym: Unit Operations Contro ller
Upload
The movement of configuration
instructions from system devices to a
configuration device or interface. An
upload lets the current values of
parameters be incorporated into new
configuration source files, eliminating
specific user entry. Uploads also may be
used to verify that configuration
instructions are correct.
WPCON
Acronym: Workplace Console. this
acronym is used in ENVOX forms. See
definition for an Operator Workplace
Console.
Glossary