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Reference Manual
00809-0100-4663, Rev BA
January 2010
Rosemount 8732
2-8
Figure 2-5. AC Transmitter
Power Connections
Connect FOUNDATION
fieldbus Wiring
The FOUNDATION fieldbus signal provides the output information from the
transmitter.
Transmitter
Communication Input
The FOUNDATION fieldbus communication requires a minimum of
9 V dc and a maximum of 32 V dc at the transmitter communication terminals.
NOTES
• Do not exceed 32 V dc at the transmitter communication terminals.
• Do not apply ac line voltage to the transmitter
communication terminals.
Improper supply voltage can damage the transmitter.
Power Conditioning Each fieldbus power supply requires a power conditioner to decouple the
power supply output from the fieldbus wiring segment.
Field Wiring Power independent of the coil power supply must be supplied for FOUNDATION
fieldbus communications. Use shielded, twisted pair for best results. For new
installations or to get maximum performance, twisted pair cable designed
especially for fieldbus should be used. Table 2-1 details cable characteristics
and ideal specifications.
Table 2-1.
Ideal Cable Specifications for
Fieldbus Wiring
AC Line or DC +
Transmitter
Power Cable
AC Neutral or DC –
AC or DC
Ground
See “Safety Messages” on page 2-1 for complete warning information.
Characteristic Ideal Specification
Impedance 100 Ohms ± 20% at 31.25 kHz
Wire Size 18 AWG (0,8 mm
2
)
Shield Coverage 90%
Attenuation 3 db/km
Capacitive Unbalance 2 nF/km