EF-Series Instruction Manual
Rev 2/01 G-5
Off-line — Accomplished while the target device is not connected (by a communications link). For
example, off-line configuration is configuring a ROC in a electronic file that is later loaded into the
ROC.
Ohms — Units of electrical resistance.
On-line — Accomplished while connected (by a communications link) to the target device. For
example, on-line configuration is configuring a ROC while connected to it, so that current
parameter values are viewed and new values can be loaded immediately.
Opcode — Type of message protocol used by the Fisher ROC or flow computer to communicate with
the configuration software, as well as with host computers.
P, Q
Parameter — A property of a point that typically can be configured or set by the user. For example,
the Point Tag ID is a parameter of an Analog Input point. Parameters are normally edited by using
configuration software running on a PC.
Pf — Flowing pressure.
PC — Personal computer.
P/DP — Pressure/Differential Pressure.
PI — Pulse Input.
PID — Proportional, Integral, and Derivative control feedback action.
PLL — Phase Lock Loop.
Point — Software-oriented term for an I/O channel or some other function, such as a flow calculation.
Points are defined by a collection of parameters.
Point Number — The “rack” and number of an I/O point as located in a ROC or flow computer.
PRI — Primary PID control loop.
PSTN — Public switched telephone network.
PT — Process Temperature.
PTIR — Periodic Timer Interrupt.
PTT — Push-to-talk signal.
Pulse — Transient variation of a signal whose value is normally constant.
PV — Process variable.
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