Installation manual

189
Glossary
Installin g and Upgrading ENVOX r Configuration Software on DEC VAX and DEC AXP Systems (Revision B — May 1998)
Glossary
Algorithm
A set of logical steps to solve a problem
or accomplish a task. A computer
program contains one or more
algorithms. Many configurations of
PROVOXr systems also contain
algorithms, particularly in operations,
procedures, and function sequence
tables.
Analog Input (AI)
A PROVOX point type. An analog input
point receives a single analog value, the
process variable.
Analog Output (AO)
A PROVOX point type. An analog output
point generates a single analog value,
the setpoint.
ASCII
1. A standard digital encoding scheme for
data: a 7-bit binary code represents
numbers, letters, symbols, and control
codes. (The designation is an acronym
for American Standard Code for
Information Interchange.)
2. A PROVOX point type. An ASCII point
contains a single real value, referenced
by the setpoint attribute, and an
80-character ASCII string.
Audit Trail
A record of changes made to the
ENVOXr database and to the system
where the database resides. The record
includes the type of change, when the
change was made and who made it.
Batch
A specific quantity of a given product,
produced in a single complete processing
procedure.
CDV
Acronym: Comma Delimited Values
CHIP
Acronym: Computer/Highway Interface
Package
Comma Delimited Values Format
An ASCII version o f configuration data.
The configuration data are in a specific
order, separated by commas. CDV-format
files result from both the export utility and
the migrate utility.
Computer/Highway Interface
Package (CHIP)
A PROVOX software product that allows
user-written programs to interact with the
PROVOX database. There a re different
CHIP versions, so that any of several
types of computers can be the host
computer.
Configuration (CONFIG)
Giving instructions and supplying
reference information to the controllers
and other devices that make up a
process control instrumentation system.
For some PROVOX systems,
Glossary