Glossary
June 2017
Instruction Manual
D103176X012
66
Controller
A device that operates automatically to regulate a
controlled variable.
Current‐to‐Pressure (I/P) Converter
An electronic component or device that converts
a milliamp signal to a proportional pneumatic
pressure output signal.
Cycle Counter
The capability of a FIELDVUE instrument to record
the number of times the travel changes direction.
The change in direction must occur after the
deadband has been exceeded before it can be
counted as a cycle.
Cycle Counter Alert
Checks the difference between the Cycle Counter
and the Cycle Counter Alert Point. Cycle Counter
Alert is active when the cycle counter value
exceeds the Cycle Counter Alert Point. It clears
after you reset the Cycle Counter to a value less
than the alert point.
Cycle Counter Alert Point
An adjustable value which, when exceeded,
activates the Cycle Counter Alert. Valid entries
are 0 to 4 billion cycles.
Cycle Counter Deadband
Region around the travel reference point, in
percent of ranged travel, established at the last
increment of the Cycle Counter. The deadband
must be exceeded before a change in travel can
be counted as a cycle. Valid entries are 0% to
100%. Typical value is between 2% and 5%.
Deviation
Usually, the difference between set point and
process variable. More generally, any departure
from a desired or expected value or pattern.
Device ID
Unique identifier embedded in the instrument at
the factory.
Device Revision
Revision number of the interface software that
permits communication between the Field
Communicator and the instrument.
Drive Signal
The signal to the I/P converter from the printed
wiring board. It is the percentage of the total
microprocessor effort needed to drive the valve
fully open.
Drive Signal Alert
Checks the drive signal and calibrated travel. If
one of the following conditions exists for more
than 20 seconds, the Drive Signal Alert is active. If
none of the conditions exist, the alert is cleared.
If Zero Control Signal = Closed
The alert is active when:
drive signal <10% and calibrated travel >3%
drive signal >90% and calibrated travel <97%
If Zero Control Signal = Open
The alert is active when:
drive signal <10% and calibrated travel <97%
drive signal >90% and calibrated travel >3%
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