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Glossary
MN05013001E
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Protective conductor
A conductor required for the protection against dangerous
currents, designated by the letters PE (abbreviation of
“Protective Earth”).
Radiated coupling
Radiated coupling occurs when an electromagnetic wave
makes contact with a conductor structure. The impact of the
wave induces currents and voltages. Typical interference
sources are, for example ignition circuits (spark plugs,
commutators of electrical motors) and transmitters (e.g.
radio-operated devices), which are operated near the
corresponding conductor structure.
Reference ground
Ground potential in the area of grounding devices. Unlike
"ground", which always has zero potential, it may have any
potential except zero.
Reference potential
Represents a reference point for measuring and/or
visualizing the voltage of any connected electrical circuits.
Repeater
Amplifier for signals transferred across a bus.
Response time
In a bus system the time interval between the sending of a
read job and the receipt of the response. Within an input
module, it represents the time interval between the signal
change at an input and its output to the bus system.
RS 485
Serial interface in accordance with the EIA standard for high-
speed data transmission via several transmitters.
Serial
Describes an information transfer technique. Data is
transferred in a bit-stream across the cables.
Shield
Term that describes the conductive covering of cables,
cubicles and cabinets.
Shielding
All measures and equipment used for connecting system
parts with the shield.
Slave
Station in a bus system that is subordinate to the master.
Station
Function unit or module, consisting of several elements.
SUB-D plug
9-pole plug for connecting the fieldbus.
