FieldBarrier
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
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6 Planning for a fieldbus application
The following section explains how to perform planning for a fieldbus application in
combination with the FieldBarrier. This planning is different in a few items
• from planning without a FieldBarrier
• depending on whether a FOUNDATION fieldbus or a PROFIBUS MBP application
is being planned.
Explicit mention is made of this in the corresponding places.
6.1 Functional description of the FieldBarrier
The FieldBarrier is used to connect up to 4 intrinsically safe fieldbus stations. It is con-
nected over non-intrinsically safe connections (trunk) with a field device using the
"Manchester Coding Bus Powered“ physical layout per IEC 61158-2. The trunk of the
fieldbus can be supplied via additional terminals to other FieldBarriers (cascading) or
other fieldbus stations.
The FieldBarrier carries out the following tasks:
• Ensuring intrinsic safety on the outputs
• Ensuring galvanic isolation between the non-intrinsically safe fieldbus segment
(trunk) and the intrinsically safe fieldbus segment (outputs).
• Connection of the trunk with a fieldbus terminator if the FieldBarrier is the last sta-
tion on the trunk.
A fieldbus terminator that can be turned on and off is integrated into the FieldBarrier
for this purpose.
• Power supply of field devices connected to the outputs
• Limit of the short circuit current on each output
If the trunk is mounted in increased safety, the FieldBarrier can be mounted in Zone
1 and Zone 22 (non-conductive dust) of a hazardous area. The terminals for the trunk
are designed in increased safety EEx e.
Use in the safe area or in Zone 2 of a hazardous area is also possible.
The trunk is galvanically separated from the outputs. 40 mA per output is available for
the intrinsically safe power supply of the field devices.
Each output has a voltage limit and current limit. This offers the advantage of prevent-
Up to 4 FieldBarriers can be connected to one fieldbus segment.
Note the definition of trunk and spur in connection with the FieldBarrier.
For more detailed information, please refer to chapter 6.2
(3 pages)
(3 pages)
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