
Original — December 1991
UM4.6:CS6003
Glossary-24
PARAM Abbreviation: Parameter
Parity Check A test for errors in transmitted data: checking whether the number of
ones (or zeros) in an array of binary digits is odd or even.
PB Acronym: Proportional Band
PC Acronym: Printed Circuit, Programmable Controller, or Personal
Computer
PCI Acronym: Pulse Count Input
PCIU Acronym: Programmable Controller Interface Unit
PD Acronym: Proportional/Derivative Control Action
PDM Acronym: Parallel Discrete Monitor
PDO Acronym: Parallel Discrete Output
Percent of Span
A scheme for indicating very large or very small values as simple
percentages. The span is a range of values defined for a specific
situation. The user establishes the limits of the range as low (0 percent)
and high (100 percent) engineering-unit values. A percent-of-span value
is a percentage of the difference between these limits.
Periodic A type of unsolicited data reporting: the sending device sends data at a
fixed rate, whether or not that data has changed since the last
transmission.
Peripheral Interface Adapter (PIA)
An integrated circuit device that provides a number of parallel discrete
input and output signals that can be controlled by the address and data
signals of an MPU.
PFR Acronym: Power Fail Restart
PI Acronym: Proportional/Integral Control Action or Process Instrumentation
PIA Acronym: Parallel Interface Adapter or Peripheral Interface Adapter
PID Acronym: Proportional/Integral/Derivative Control Action
PI_PID_I Acronym: Proportional/Integral—Proportional/Integral/Derivative Control
Action
PIO Acronym: Process Input/Output
PAR - PIO
Glossary
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