
Original — December 1991
UM4.6:CS6003
Glossary-22
O
OAL Acronym: Operator Attention List
OAR Acronym: Operator Action Request
OCC Abbreviation: Occurrence
Octal Involving eight characteristics, conditions, or possibilities. For example,
octal numbers (0 through 7) have the base (radix) 8.
OEM Original Equipment Manufacturer
On/Off Controller
A controller that has only discrete output values: on or off.
OP AMP Acronym: Operational Amplifier
Operand 1. In a function sequence table, a value that modifies or qualifies a
function.
2. In ASCII configuration source files, an expression, a simple operand, a
phrase list, or an operand list.
Operand List In ASCII configuration source files, two or more operands separated by
commas.
Operating System
The software that controls and supervises all the internal operations of a
computer.
Operational Amplifier (OP AMP)
A high-gain, linear, DC amplifier, typically an integrated circuit, used in a
wide variety of applications.
Operation [See Unit Operation]
Operator Action Request (OAR)
A notice of operator action required before an operation can continue.
OARs appear in the faceplate for a unit point and in the OAL, in a format
similar to that of alarms.
Operator Attention List (OAL)
A one-line console message that alerts the operator to displays that
have points in alarm, batch units that require information, console errors,
or communications problems.
Operator Station
A local control station that can be connected to regulatory controllers. An
operator station displays mst of the same information that appears in a
faceplate display, and gives basic control over a control loop.
OAL - O
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Glossary
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