CEMP-E
TI 810-11
30 November 1998
OL:
Overload
Open-Loop System:
Control-system configuration that does not
have system feedback.
OUT:
Output
Output Signal:
A signal produced in response to an input.
P:
Proportional Control Mode
Pa:
Pascal
Parameter:
Information and values to be used in
configuring a microprocessor controller for its
purpose in the control-system application.
PB:
Proportional Band
PC:
Outside-Air Preheat Coil, Pressure Controller
PE:
Pneumatic-Electric Switch
PH:
Phase
PI:
Pressure Indicator (Gauge) or
Proportional-Plus-Integral Control Mode
PID:
Proportional-Plus-Integral-Plus Derivative
Control Mode
PL:
Pilot Light
Positive Positioner:
A mechanical device that measures actuator
position and control signal value and sends
main air to the actuator to maintain the
correct position for the signal.
PP:
Positive Positioner
Process Control:
The science of regulating variables by
measuring, processing, and manipulating
process variables coupled to the regulated
variables.
Process Variable:
See Controlled Variable.
Process Variable Contact (PV):
A single-loop digital controller output contact
that can be configured to respond to a given
value of the process variable input signal.
PROP:
Proportional
Glossary-9
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