
Original — December 1991
UM4.6:CS6003
Glossary-12
ENVOX Trademark for Fisher Controls’ product line of advanced configuration
devices for certain process control systems. The use of a third-party
relational database is the principal distinguishing feature of configuration
with an ENVOX device.
EOT Acronym: End of Transmission
EPCI Acronym: Extended Pulse Count Input
EPROM Acronym: Erasable Programmable Read-Only Memory
Erasable Programmable Read-Only Memory (EPROM)
A semiconductor memory device that is programmable electrically, but
erasable only by exposure to high-intensity ultraviolet light.
ERR Abbreviation: Error
Error Signal In a closed loop, the difference between the actual value of a particular
signal and its desired value (usually PV and SP).
Error-Squared PI_PID
A type of primary control algorithm which is similar to a normal PI_PID
algorithm, but acts on the square of the error signal (where the sign of
the error signal is retained) instead of the normal error signal value.
ESD Acronym: Electrostatic Damage
Ethernet Xerox trademark for a local area network communication scheme via
coaxial cable. The scheme permits multiple access with collision
detection, and arbitrates the use of a 10 Megabit-per-second baseband.
Ethernet conforms to IEEE standard 802.3.
EU Acronym: Engineering Units
EUHV Obsolete acronym: Engineering Units High Value (replaced by HIEC:
High Engineering Units Scale Factor)
EULV Obsolete acronym: Engineering Units Low Value (replaced by LOEC:
Low Engineering Units Scale Factor)
EXP Abbreviation: Expected
Expression A mathematical phrase which is used in a unit operation. An expression
always follows the sequence of operand-operator-operand.
EXT Abbreviation: Extended or External In PROVOX, EXT usually refers to
an External Interface card.
ENV - EXT
Glossary
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