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Glossary
mA
Milliamp, which is 1/1000th of an Ampere.
MB
Mega-byte.
MODBUS®
Communication Protocol by Gould, Inc. for industrial communications systems comprised of programmable controller
interface units, protocol software and modems. The MDS drive module follows the Modbus specification outlined in the
Modicon Modbus Protocol Reference Manual, PI-MBNS-300 Revision G, November 1994.
Module
Function Module
Most Significant Bit
The bit in a binary number that is the most important or that has the most weight.
ms
Millisecond.
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
Also known as the Radio Button. Round button used to select one of a group of mutually exclusive options.
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
A function (i.e., Drive OK, Fault) that may be assigned to an output line.
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.
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.