
Original — December 1991
UM4.6:CS6003
Glossary-25
PKT Abbreviation: Packet
Plant Management Area (PMA)
A collection of plant process areas (PPAs). A PMA controls the console
point reporting load, and indirectly, central processing unit (CPU) loading.
Plant Process Area (PPA)
Within a process-control system, a collection of equipment that uses a
common alarm strategy.
PMA Acronym: Plant Management Area
Point A set of process-control parameters and data. The makeup and structure
of each point depends on its role in collecting and reporting data and the
type of device in which the point resides. Points are the most important
logical units of a process control system; the number of points is one
measure of a system’s size and sophistication.
Port A communications terminal of a regulatory controller card file. Each port
is dedicated to the reporting of one controller. Consequently, port
numbers identify particular controllers.
Power Fail Restart (PFR)
The actions of a device upon the loss and subsequent restoration of
operating power.
Power Supply Common (PSC)
The negative terminal of the 24- volt system power supply: a reference
for digital signals.
Power Supply Unit (PSU)
In a PROVOX instrumentation system, a device or component that
converts standard alternating current to the direct current voltage that
other system devices need.
P_PD Acronym: Proportional—Proportional/Derivative Control Action
PRI Abbreviation: Primary
Printed Circuit (PC)
A conduction path of metal on a substrate material which is used to carry
signals between electronic components.
Printed Wiring Board (PWB)
A board containing printed circuits (printed wiring) which serves as the
mounting base for integrated circuits and other electronic components.
Procedure A time-and-event sequence, with corresponding product data, used as
part of a program for the manufacture of the product.
PKT - Pro
Glossary
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