Fisher FIELDVUE DVC6200p Instruction Manual page 158

Glossary
June 2017
Hardware Revision
Revision number of the Fisher instrument
hardware. The physical components of the
instrument are defined as the hardware.
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.
156
PROFIBUS PA (Process Automation)
A protocol used to monitor measuring
equipment or control digital
controllers/positioners via a process control
system in process automation applications.
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.
Temperature Sensor
A device within the FIELDVUE instrument that
measures the instrument's internal temperature.
Travel
Movement of the valve stem or shaft which
changes the amount the valve is open or closed.
Travel Sensor
A device within the FIELDVUE instrument that
senses valve stem or shaft movement. The travel
sensor in the DVC6200p is the Hall Effect sensor
that measures the position of the magnet
assembly.
Instruction Manual
D103563X012