App.-3
Appendix
O
OH (output high limit)
MV high limit
The highest MV allowed. It can be set for normal control output, control output for
cooling, control output during AT, etc.
OL (output low limit)
MV low limit
The lowest MV allowed. It can be set for normal control output, control output for
cooling, control output during AT, etc.
P
P (proportional)
P action (proportional action)
Proportional control A control method in which the amount of correction is
proportional to the amount of deviation. The range of the controlled variable to be
corrected is called the proportional band. When only P action is used for control,
an offset occurs in which the controlled variable becomes stable at a value equal to
or less than the set point.
PID (proportional, integral, and derivative)
PID control
A control method that uses proportional, integral, and derivative actions.
PLC (programmable logic controller)
Programmable controller
A sequencer.
PV (process value)
Present value
Present value, measured value, detected value
R
RJ (reference junction)
Reference junction compensation
A thermocouple has two junctions for the purpose of temperature measurement,
one at the object being measured and the other connected to the measuring
instrument. The junction connected to the measuring instrument is called the
reference junction.
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