Glossary - Fisher FIELDVUE DLC3010 Instruction Manual

Instruction Manual
D102748X012

Glossary

Alarm Deadband
The amount by which the process variable must
return within normal limits for the alarm to clear.
Alarm Limit
An adjustable value that, when exceeded,
activates an alert.
Algorithm
A set of logical steps to solve a problem or
accomplish a task. A computer program contains
one or more algorithms.
Alphanumeric
Consisting of letters and numbers.
ANSI (acronym)
The acronym ANSI stands for the American
National Standards Institute
Burst
Burst mode is an extension to HART protocol that
provides the continuous transmission of standard
HART command response by a field device.
Byte
A unit of binary digits (bits). A byte consists of
eight bits.
Commissioning
Functions performed with a Field Communicator
and the digital level controller to test the
instrument and loop and verify digital level
controller configuration data.
Configuration
Stored instructions and operating parameters for
a FIELDVUE Instrument.
Control Loop
An arrangement of physical and electronic
components for process control. The electronic
components of the loop continuously measure
one or more aspects of the process, then alter
those aspects as necessary to achieve a desired
process condition. A simple control loop
measures only one variable. More sophisticated
control loops measure many variables and
maintain specified relationships among those
variables.
Damping
Output function that increases the time constant
of the digital level controller output to smooth
the output when there are rapid input variations.
Descriptor
Sixteen‐character field for additional
identification of the digital level controller, its
use, or location. The descriptor is stored in the
instrument and can be changed using a Field
Communicator and the device information
function.
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.
Firmware Revision
The revision number of the instrument firmware.
Firmware is a program that is entered into the
instrument at time of manufacture and cannot be
changed by the user.
Free Time
Percent of time that the microprocessor is idle. A
typical value is 25%. The actual value depends on
the number of functions in the instrument that
are enabled and on the amount of
communication currently in progress.
Glossary
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