Pepperl+Fuchs HD2-GTR-4PA Manual page 68

Appendix 1 / Glossary
Term
RS 485
Segment Protector
SegmentChecker
Spur
Static Revision Counter
transparent Coupling
Trunk
Watchdog time
Zone 0
Zone 1
Zone 2
Subject to reasonable modifications due to technical advances.
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P R O F I B U S P
O W E R
Explanation
Communication protocol on the
PROFIBUS DP segment
Junction Box by Pepperl+Fuchs with
implemented short circuit protection
Software for designing, calculating
and checking for plausibility of entire
fieldbus installations using a GUI.
A usually short cable which connects
the field device to the trunk
Counter which is increased by one
everytime a substantial change of
state occurs. Can be used for status
monitoring
Coupling in which all PA slaves appear
on the DP bus as if they were DP sla-
ves
Main line of a fieldbus segment. Leads
from the supply to the Junction Box,
where the spurs go off
Time after which a device is taken out
of the cyclic data exchange
Zone in which a hazardous, potencial-
ly explosive atmosphere comprised of
air and inflammable gases, fumes or
fog is present permanently, over lon-
ger periods of time or frequently.
Zone in which during normal operation
a hazardous, potentially explosive at-
mosphere comprised of air and in-
flammable gases, fumes or fog is
occasionally present.
Zone in which a hazardous, potentially
explosive atmosphere comprised of
air and inflammable gases, fumes or
fog is normally not or only present for
short periods of time.
H S
U B E G M E N T
Copyright Pepperl+Fuchs, Printed in Germany
C
O U P L E R