P R O F I B U S P
O W E R
H
U B
S
E G M E N T
C
O U P L E R
Appendix 1 / Glossary
Subject to reasonable modifications due to technical advances.
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24.
3.
11
Physical Layer
Layer 1 of the OSI 7 layer model. This
is where physical data exchange takes
place
Power Conditioner Module
Not galvanically isolated Power Hub
Module for segment supply
Power Hub Module
Term under which Power Supply Mo-
dules and Power Conditioner Modules
as well as Diagnostic Modules are
subsumed
Power loss
Energy produced during device opera-
tion which is let off in form of heat into
surroundings
Power Supply Module
Galvanically isolated Power Hub Mo-
dule which limits votage to a given va-
lue and supplies the segment with this
voltage
PROFIBUS DP
PROFIBUS Decentralized Periphery.
Most often used PROFIBUS protocol
using transmission rates between
9,6 kbit/s and 12 Mbit/s.
PROFIBUS MBP
PROFIBUS Manchester-Coded Bus
Powered. New Term for
PROFIBUS PA
PROFIBUS PA
PROFIBUS Process Automation.
PROFIBUS protocol using a transmis-
sion rate of 31,25 kbit/s. Unlike
PROFIBUS DP, PROFIBUS PA can be
used in intrinsically safe circuits
Redundant Coupling
Coupling which is implemented twice,
thereby offering increased reliability.
Coupling is performed by two Gateway
Modules on the Gateway Motherboard
Redundant Supply
Supply which is implemented twice,
thereby offering increased reliability.
Per segment, two Power Modules sup-
ply field devices
Retry limit
Number of retries which are underta-
ken before a field device is interpreted
as non-existent by the host
Term
Explanation