Emerson FM-3 - Manual (Page 283)

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Glossary
NVM
Non-Volatile Memory. NVM stores specifically defined variables as the variables
dynamically change. It is used to store changes through a power loss.
NTC
Negative Temperature Resistor
Option Button
See Radio Button.
Opto-isolated
A method of sending a signal from one piece of equipment to another without the usual
requirement of common ground potentials. The signal is transmitted optically with a light
source (usually a Light Emitting Diode) and a light sensor (usually a photosensitive
transistor). These optical components provide electrical isolation.
Output Function
See source. The terminals at which energy is taken from a circuit or device.
Output Line
The actual transistor or relay controlled output signal.
Parameters
User read only or read/write parameters that indicate and control the drive operation. These
variables generally hold numerical data defined in the Setup Views.
PC
Personal Computer.
PE
Protective Earth.
PID
Proportional-Integral-Derivative. An acronym that describes the compensation structure that
can be used in many closed-loop systems.
PLC
Programmable Logic Controller. Also known as a programmable controller, these devices are
used for machine control and sequencing.