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Glossary

Original Ć June 1990 CE4.2:CL6211

PCIU Acronym: Programmable Controller Interface Unit

PD Acronym: Proportional Derivative

PDO Acronym: Parallel Discrete Output

Periodic A type of unsolicited data reporting: the sending device transmits 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

Phase In batch control, several related elemental control steps grouped

together for the purpose of batch tracking or operator intervention at the

unit operations control level. A set of phases makes up a unit operation.

PI Acronym: Proportional/Integral Control Action or Process Instrumentation

PIA Acronym: Peripheral Interface Adapter

PID Acronym: Proportional/Integral/Derivative Control Action

PI_PID_I Acronym: Proportional/IntegralĊProportional/Integral/DerivativeĊ

IntegralĆonly Control Action

PIO Acronym: Process Input/Output

PLC Acronym: Programmable Logic Controller

Point A set of processĆcontrol data and services. 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 controller card file. Each port is

dedicated to the reporting of one controller. Consequently, port numbers

identify particular controllers.

P_PD Acronym: ProportionalĊProportional/Derivative Control Action

PCIU - P

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