
Original — December 1991
UM4.6:CS6003
Glossary-7
Control Sequence
A type of primary control algorithm which provides basic functions such
as alarming, data communication, tracking, and error signal calculation,
but does not provide any form of control action. This allows the user to
create a customized control algorithm transfer function using FST
instructions.
CPU Acronym: Central Processing Unit.
CRC Acronym: Cyclic Redundancy Check
CRI Acronym: Control Room Instrumentation
CSA Acronym: Canadian Standards Association
Cyclic Redundancy Check (CRC)
A method of error detection in data transmission and data storage. The
check evaluates both the number of ones and zeroes in a block (parity)
and the position of the values in the block.
D
D Abbreviation: Derivative Control Action (Rate)
D/A Acronym: Digital to Analog, or Digital to Analog Converter
DAC Acronym: Digital to Analog Converter
Damping Reducing or suppressing oscillation of an output value after a change in
the measured signal. When the response to an output change is as fast
as possible without overshoot, the response is critically damped. If the
response is slower than critical it is overdamped, and if an overshoot
occurs the response is underdamped.
Data A general term that denotes any information an MPU can process.
Database A collection of data stored in a systematic way so that searches and
sorts are rapid and so that retrieval of items is simple.
Database Index (DBI)
A sequential integer by which a computer or other electronic device finds
or keeps track of storage locations in a database.
Data Concentrator
A highway device that collects and consolidates information for
configurable, computing, and interactive controllers, interfacing the
controllers to the data highway; also known as data concentrator unit
(DCU).
Con - Data
Glossary
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