Fieldbus functionality
64
Field hook-up
Figure 4-4 illustrates one method of connecting the 475 Field
Communicator to a fieldbus segment. The 475 Field Communicator
can be
connected at any convenient place along the bus (segment). In
the field, this is typically done at the device or at the fieldbus junction
box.
Figure 4-4. Field wiring diagram example
T
e
r
m
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n
a
t
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r
T
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Fieldbus
power
conditioner
24 VDC
power
supply
Fieldbus
junction
box
Fieldbus
host
control
system
++
+
++
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-
CAUTION
The 475 Field Communicator draws approximately 12 mA from the
fieldbus segment. Ensure the power supply or barrier on the fieldbus
segment has the capacity to provide this additional current. If a
fieldbus segment is drawing near the capacity of the segment’s power
supply, connecting the 475 Field Communicator may result in loss of
communication.
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