Siemens 6ES7 972-4AA02-0XA0 User Manual page 47

User´s Guide Power Rail Booster
DP Master Segment
A contact rail system can be connected to the PROFIBUS via one or more than one
PROFIBUS master. The segment of a contact rail system in which data interchange
takes place via a PROFIBUS master is referred to as a "DP master segment".
Normally, a contact rail system consists of only one DP master segment. If there are
multiple DP master segments, care must be taken to see that no electrical
connection (short circuit) can be established between DP master segments via the
double collector. This can be done using rail sections.
DP Slave
A slave that is operated on the PROFIBUS with the PROFIBUS DP protocol and has
behavioural characteristics which accord with EN 50170, Volume 2, PROFIBUS is
referred to as a DP slave.
DP Standard
The DP Standard is the bus protocol which can be transmitted over the Power Rail
Booster to EN 50170, Volume 2, PROFIBUS.
Equipotential Bonding
Electrical connection (equipotential bonding conductor) which brings the exposed
conductive part(s) of an electrical device and extraneous conductive parts to the
same or almost the same potential in order to prevent damaging or dangerous
voltages between these parts.
FO
Fiber optics
Ground
Conductive ground whose electrical potential can be set to equal zero at any point.
In the presence of a grounding electrode, ground can have a potential unequal zero.
The term "reference potential" is often used to describe this set of circumstances.
Isolated
In isolated input/output modules, the reference potentials of control current circuit
and load current circuit are galvanically isolated, e.g. by optical coupler, relay contact
or transformer. Input/output current circuits can be connected to common potential.
Isolating Rail Section
A rail section on which the data contact rails are isolated over the length of a double
sliding contact in order to prevent short circuits between two contact rail segments,
which can occur when a (double) sliding contact travels over a rail section.
Master
When it has the Token, a master can send data to other nodes and request data
from other nodes (= active node). DP masters are e.g. the CPU 315-2 DP or the IM
308-C.
Non-isolated
In non-isolated input/output modules, the reference potentials of control current
circuit and load current circuit are electrically connected.
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6ES7 972-4AA02-0XA0
Version 12/2005
Page 46 of 49