
Original — December 1991
UM4.6:CS6003
Glossary-13
Extended ac
2
A multiplexer point type that monitors signals associated with Fisher
Controls ac
2
100 instrumentation, and also allows an operator of a
console or other PROVOX highway device to adjust the ac
2
SP value.
Extended Analog Input
A multiplexer point type that accepts an analog signal from a field device,
and can apply a first-order filter, square-root conversion, or thermocouple
conversion before passing the value to the data highway.
Extended Analog Output
A multiplexer point type that receives an analog value from the
data-highway, then converts that value to an analog signal which is sent
to a field device. Should the expected value not arrive over the highway,
the algorithm sends a default signal to the field device.
Extended Discrete Output
A multiplexer point type that receives a discrete value from the
data-highway, then converts that value to a discrete signal which is sent
to a field device. Should the expected value not arrive over the highway,
the algorithm sends a default signal to the field device.
Extended Functions
Optional capability that can be enabled for certain point types, increasing
the number of functions the point can perform. Common extended
functions are pressure/temperature compensation, signal
characterization, and extended alarms.
Extended Pulse Count Input (EPCI)
A PROVOX point type. An EPCI point reads a series of electronic pulses
or switch closures as an unsigned, 16-bit integer value, then calculates
accumulation and rate values.
F
Faceplate An established display figure that shows the most important information
about a process control point. Faceplates are vertical rectangles, several
of which fit on a console screen at once.
FDFWD Acronym: Feedforward
Feedforward (FF or FDFWD)
A type of control action that takes into account signals other than the
process variable, in order to anticipate and minimize deviations of the
process variable.
FF Acronym: Feedforward
FIFO Acronym: First In, First Out
Ext - FIFO
Glossary
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