Instruction Manual
D102748X012
Glossary
October 2014
107
Random Access Memory (RAM)
A type of semiconductor memory that is normally
used by the microprocessor during normal
operation that permits rapid retrieval and storage
of programs and data. See also Read Only
Memory (ROM) and Non‐Volatile Memory (NVM).
Read‐Only Memory (ROM)
A memory in which information is stored at the
time of instrument manufacture. You can
examine but not change ROM contents.
Reranging
Configuration function that changes the digital
level controller 4 to 20 mA settings.
RTD
The abbreviation for resistance temperature
detector. Temperature is measured by the RTD by
correlating the resistance of the RTD element
with temperature.
Send Data
A Field Communicator command that transfers
configuration data from the Field
Communicator's working register to the digital
level controller memory.
SI Units
The International System of Units. Includes
metric units such as ampere (A), meter (m),
kilogram (kg), Kelvin (K), and second (s).
Software
Microprocessor or computer programs and
routines that reside in alterable memory (usually
RAM), as opposed to firmware, which consists of
programs and routines that are programmed into
memory (usually ROM) when the instrument is
manufactured. Software can be manipulated
during normal operation, firmware cannot.
Span
Algebraic difference between the upper and
lower range values.
Temperature Sensor
A device within the instrument that measures the
instrument's internal temperature.
Upper Range Value (URV)
Highest value of the process variable that the
digital level controller is currently configured to
measure in the 4 to 20 mA loop.
Upper Sensor Limit (USL)
Highest value of the process variable that the
digital level controller can be configured to
measure.
Working Register
Memory location in a Field Communicator that
temporarily stores data as it is being entered.
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