Interkama 2001
Fieldbus barrier for
Profibus PA and Foundation Fieldbus
Due to the
instrumentation provided with the newly developed Pepperl+Fuchs
Field bus barriers Type F2DO-FB-Ex4.IEC, up to 31 bus stations can
be supplied under conditions of intrinsic safety on one bus segment.
The field bus
barrier provides an intrinsically safe (EEx ia IIC) power supply
for bus stations on a bus segment. It can be used universally for
H1 field bus segments in accordance with field bus standard IEC
61158-2; 31.25 kbit/s (Profibus PA, Foundation Fieldbus). The fieldbus
housing is protected to IP66 and can be installed in hazardous areas
in Zone 1.
The supply
is obtained from a supply source in the safe area, without Ex approval.
This means that the supply power can be as high as desired. For
example, the Type KFD2-BR-1.PA.93 Profibus PA segment coupler or
the power repeater for IEC 61158-2 fieldbuses - the Type KLD2-PR-1.IEC
from Pepperl+Fuchs - can be used.
The fieldbus
barrier is protected to EEx me [ia] IIC T4. It has four intrinsically
safe outputs, which satisfy the FISCO model. Up to three bus stations
(Profibus PA or Foundation Fieldbus) can be connected to each of
these four short-circuit-proof outputs, via screw terminals. The
leads for the bus stations can be up to 120 metres long.
Many field
bus barriers can be connected to one bus segment and a total of
31 bus stations can be connected to one bus segment. The intrinsically
safe outputs are galvanically isolated from the non-intrinsically
safe supply circuit. This avoids coupling through the equipotential
bonding. In the event of short-circuiting on one output the bus
stations continue to function on the other outputs. The fieldbus
barrier not only secures the supply and communication of the fieldbus
stations; it also simultaneously serves a s a field wiring level.
- Pepperl
+ Fuchs
e112@industrialnetworking.co.uk
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