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
Specification
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
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Various Power Hub power supply solutions offer either simplex or red-
undant power to PROFIBUS PA segments. The Power Hub consists of
a motherboard with sockets for plug-in modules.
•
One power supply module per segment in simplex mode or, al-
ternatively, two power supply modules per segment in redun-
dant mode.
•
A physical layer diagnostic module HD2-DM*.
The Power Hub feeds fieldbus segments following the High-Power
Trunk concept for explosion protection. High energy level on the trunk
line is fed to the field instruments via couplers like FieldBarriers or Seg-
ment Protectors. A dedicated version of the Power Hub (DART) sup-
ports the intrinsically safe concept for fieldbus.
A plug-in Advanced Diagnostic Module for fieldbus is available. This mo-
dule monitors the physical layer online and in real time enabling detec-
tion of degradation and faults during operation. Measurement data and
alarms are transmitted to the control room thus bringing visibility to the
fieldbus physical layer, which can now be treated as active component
in Plant Asset Management systems. Operators are enabled to decide
on proactive measures to avoid unwanted situations while the plant is
running smoothly.
2.2
Coupling
Coupling involves a Gateway Motherboard and one or, in the case of
redundant coupling, two Gateway Modules.
The purpose of coupling is to adjust the physical transmission proper-
ties on the DP side (RS 485) to those of the PROFIBUS PA (in confor-
mity with IEC 61158-2). The coupling provides a baudrate of 31.25 kbit/
s on the PA side. In addition, the coupling creates galvanic isolation bet-
ween PROFIBUS DP and PROFIBUS PA. The DP/PA coupling of the
PROFIBUS Power Hub System is functionally compatible with the Pep-
perl+Fuchs SK 2 System, which is well established on the market.
The coupling of the PROFIBUS PA slave to the PROFIBUS DP is trans-
parent. This means that all PA slaves appear on the DP bus and are in-
terpreted by the Host as DP slaves. A DP address is also assigned to
the Gateway itself for diagnostic and parameterization purposes.
Although segment supply is part of the PROFIBUS Power Hub System,
it is not described in this manual (only where needed for better under-
standing). Please refer to the respective „Generic Power Hub“ manuals
for detailed information on segment supply.
Note