
Original — December 1991
UM4.6:CS6003
Glossary-19
Measured Variable (MV)
A physical quality or quantity which is monitored as part of a control
strategy. Common measured variables are temperature, level, and rate
of flow. The term process variable is a synonym.
Memory A computer’s storage for programs and data. Most computers and
microprocessors have both internal and external memories: use of
internal memories is usually faster, but the capacity of internal memories
is more limited. Internal memories are usually ROM or RAM; external
memories are usually disk or tape drives.
MGP Acronym: Master Ground Point
Microprocessor A complex integrated circuit that can be programmed to perform different
tasks.
Microprocessor Unit (MPU)
A general-purpose integrated circuit that performs the functions of the
central processing unit (CPU) of a computer.
MIN Abbreviation: Minimum
Mode Identification of who or what controls changes to certain types of point
data. Point data may potentially be changed by a human operator, a
controller algorithm, a computer, and another point. Each mode
determines which of these is allowed to change point data. The seven
possible modes in a PROVOX system are: manual, automatic, remote
set point, supervisory, direct digital control, computer, and hard
manual.
Modem Modulator/demodulator: a device that allows a computer to transmit and
receive data via a telephone or other communications network.
Monitor A PROVOX point type. A monitor point is used to retain a single analog
or discrete value. Analog monitored values are typically displayed on a
console display as a PV bar graph. In a monitor point, the device
containing the point is allowed to read or write the value and other
system devices are only allowed to read the analog value.
Most-Significant Digit (MSD)
The highest-value position of an integer; used in the control panel of
certain products.
Motorola, Inc. A manufacturer of electronic components and microprocessors.
PROVOX devices use many Motorola integrated circuits and MPUs,
including 8-bit (MC6809) and 16-bit (MC68000 and MC68010) machines.
MPU Acronym: Microprocessor Unit
Mea - MPU
Glossary
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