ABB 266 MODBUS User Manual page 155

Term
bias
binary
binary-coded decimal
bit
bits per second
board
b/s, BPS
buffer
bus
byte
cal checks
calibrate
central processing unit, CPU
character
COMM
communication port, COMM
CPU
differential pressure, DP
digit
digital
DIP switches
flowing temperature, T
f
flowing, DP
FM
gauge pressure
HMI
IEC
ISO
LRL, lower range limit
Definition
refers to adjusting the measurement to agree with the calibrated standard. This figure maybe either
positive or negative.
abase-2 (instead of base-ten) numbering system. The binary digits are 0 and 1.
a code for representing decimal digits in a binary format.
one binary digit, either 0 or 1, which is the smallest unit of binary data. Used as an adjective, it may refer
to the number of bits used internally by a computer's CPU or in a computer application (16 bit processor,
32 bit application). Also see byte.
unit of rate for data transmission
the common name used to identify an electronic board. It is also called motherboard, engine card and
circuit board.
bits per second
1) a temporary storage device used to compensate for a difference in data rate and data flow between
two devices (typically a computer and a printer); also called a spooler. 2)an amplifier to increase the drive
capability, current or distance of an analog or digital signal
a data path shared by many transmitters, for example a multipoint line with one or more conductors for
transmitting signals, data, or power
a basic unit of information in computer storage and processing. A byte consists of 8 adjacent binary digits
(bits), each of which consists of a 0 or a 1.
calibration checks
to ascertain, usually by comparison with a standard, the locations at which scale or chart graduations
should be placed to correspond to a series of values of quantity which the instrument is to measure,
receive, or transmit. Also, to adjust the output of a transmitter, to bring it to a desired value within a
specified tolerance for a particular value of the input. And, to ascertain the error in the output of a
transmitter by checking it against a standard
the central part of a computer system that performs operations on data. In a personal computer the CPU
is typically a single microprocessor integrated circuit.
a letter, digit or other symbol that is used as the representation of data. A connected sequence of
characters is called a character string.
abbreviation for communication port
communication port (abbreviated COMM) refers to the Host computer's physical communication's port
used to communicate with peripheral equipment. The term is used by Totalflow when discussing local or
remote communication with various equipment including the XFC, FCU, XRC, RTU and LevelMaster.
central processing unit
the pressure difference between two points in a system. For example, it is the difference in pressure
between the upstream and downstream taps of an orifice plate, used to measure volume passing
through the orifice.
a measure of the display span of a panel meter. By convention, a full digit can assume any value from 0
through 9, a 1/2-digit will display a 1 and overload at 2, a 3/4-digit will display digits up to 3 and overload
at 4, etc. For example, a meter with a display span of ±3999 counts is said to be a 3-3/4 digit meter.
a signal which has distinct states, either on or off (0 or 1). Digital computers process data as binary
information having either true or false states.
Dual In-line Package. A bank of switches typically used in setting the hardware configuration and base
address of an option card
temperature of the flowing fluid, usually gas, and measured by an RTD.
differential pressure of the flowing fluid, usually gas. See differential pressure for more information.
Factory Mutual Research Corporation is an organization which sets industrial safety standards.
absolute pressure minus local atmospheric pressure
human machine interface
International Electrotechnical Commission
International Organization for Standardization
the lower range limit of a specific sensor is the lowest measured value that can be measured by the
transmitter within the specified accuracy.
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 147
Appendix G Glossary