6-1
Section 6 F
OUNDATION
Fieldbus Guidelines
Installation and Operation Manual
X-DPT-FF-MT3809G-Alarms-eng
Part Number: 541B218AAG
December, 2017
Model MT3809G F
OUNDATION
TM
Fieldbus
6
F
OUNDATION
TM
Fieldbus Guidelines
.
Source: F
OUNDATION
™ Fieldbus Application Guide - 31.25 kbit/s Wiring and
Installation. Refer to the F
OUNDATION
™ Fieldbus fieldComm website in the
end-user resources section for the complete set of application guides.
6.1
General Network Installation Guidelines
Building the network
Figure 6-1 shows how to make a fieldbus network from a wire pair.
A terminator is added at the FFI end of the wire pair. Another terminator is
added at the field device end of the wire pair. The FFI may have a built-in
terminator so that you don't have to add one. Check the manufacturer's
specifications to be sure.
Notice that neither wire is grounded. This is one of the absolute rules
of fieldbus.
Figure 6-1 Simple Fieldbus Network
Figure 6-2 Fieldbus Network with Additional Devices Added
F
OUNDATION
Fieldbus
Interface
FFI
Wire Pair
Signals
Terminator
Terminator
Fieldbus
Digital
Field Device
T
T
F
OUNDATION
Fieldbus
Interface
FFI
Wire Pair
Signals
Terminator
Terminator
T
T
FD
FD
FD
FD
FD = Field Device
