Emerson Fisher FIELDVUE DVC6000f, Instruction Manual

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DVC6000f Digital Valve Controllers
December 2009 Glossary-2
Firmware
The combination of a hardware device and
computer instructions and data that reside as
read-only software on that device.
Note
1. This term (firmware) is sometimes
used to refer only to the hardware
device or only to the computer
instructions or data, but these
meanings are deprecated.
2. The confusion surrounding this
term has led some to suggest that it be
avoided altogether. The term is
included here because of its use in
older documentation and culture.
Gain
The ratio of output change to input change.
Hardware Revision
Revision number of the Fisher instrument
hardware. The physical components of the
instrument are defined as the hardware.
HART (acronym)
The acronym HART stands for Highway
Addressable Remote Transducer.
Instrument Level
Determines the functions available for the
instrument.
Leak Class
Defines the allowable leakage by a valve when it
is closed. Leak class numbers are listed in two
standards: ANSI/FCI 70-2 and IEC 534-4.
Linearity, dynamic
Linearity (independent) is the maximum deviation
from a straight line best fit to the opening and
closing curves and a line representing the
average value of those curves.
Memory
A type of semiconductor used for storing
programs or data. FIELDVUE instruments use
three types of memory: Random Access Memory
(RAM), Read Only Memory (ROM), and
Non-Volatile Memory (NVM).
Non-Volatile Memory (NVM)
A type of semiconductor memory that retains its
contents even though power is disconnected.
NVM contents can be changed during
configuration unlike ROM which can be changed
only at time of instrument manufacture. NVM
stores configuration restart data.
Octet
See byte
Parallel
Simultaneous: said of data transmission on two or
more channels at the same time.
Pressure Sensor
A FIELDVUE instrument internal device that
senses the output pressure from the pneumatic
relay.
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).
Rate
Amount of change in output proportional to the
rate of change in input.
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.
Seat Load
Force exerted on the valve seat, typically
expressed in pounds force per lineal inch of port
circumference. Seat load is determined by shutoff
requirements.
Software
Computer programs, procedures, and possibly
associated documentation and data pertaining to
the operation of a computer system.
G
Glossary