Response Electronics CL6011B Dokumentacja Pobierz pdf (Strona 304)

Glossary

Original Ć June 1990CE4.2:CL6211

Primary Control Algorithm (PCA)

The principal control equation of a continuous control loop in a PROVOX

controller. The PCA type and station (STA) type, defined during

configuration, determine the main functionality of a control loop point.

Process Input/Output (PIO)

The name of an interactive controller card that accepts analog input

signals, performs A/D and D/A conversions, and generates analog

output signals.

Process Variable (PV)

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 measured variable is a synonym.

Programmable Controller Interface Unit (PCIU)

A PROVOX highway device that permits programmable controllers to

receive and respond to commands from other PROVOX devices such as

consoles, trend units, and UOCs, via the data highway.

Programmable ReadĆOnly Memory (PROM)

A chip which is programmable only by means of a special device; once

programmed in this way, it effectively becomes a ROM.

PROM Acronym: Programmable ReadĆOnly Memory

Proportional Band

The change in a controller input required to produce a fullĆrange change

in output, due to proportional control action. The proportional band is

reciprocally related to the proportional gain, and may be expressed as a

percent of input span or in input units.

Proportional Control Action (P)

A control method in which there is a continuous linear relationship

between output and input. The proportional amount is known as gain.

Proportional/Derivative Control Action (PD)

Control action in which the output is proportional to a combination of the

linear relationship between output and input and the time rate of change

of the input.

Proportional/Integral Control Action (PI)

Control action in which the output is proportional to a combination of the

linear relationship between output and input and the time integral of the

input.

Proportional/Integral/Derivative Control Action (PID)

Control action in which the output is proportional to a combination of the

linear relationship between output and input, the time integral of the

input, and the time rate of change of the input.

Pri - Pro

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