Emerson 375 User Manual page 68

4-8
Figure 4-4. Field wiring diagram example
Fieldbus
+
Host
Control
System
-
Field Hook-Up
Figure 4-4 illustrates one method of connecting the 375
Field Communicator to a fieldbus segment. The 375
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.
+
Fieldbus
Power
Conditioner
-
-
+
24 Vdc
Power
supply
NOTE
The 375 Field Communicator draws approximately 17
mA from the fieldbus segment. Be sure that the power
supply or barrier on the fieldbus segment has the
capacity to provide this additional current. If a heavily
loaded fieldbus segment is drawing near the capacity of
the segment's power supply, connecting the 375 may
result in loss of communication.
T
+
e
r
m
i
-
n
a
t
o
r
Fieldbus Functionality
T
+
e
Fieldbus
r
Junction
m
Box
i
-
n
a
t
o
r