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Reference Manual
00809-0100-4665, Rev AA
August 2010
2-7
Rosemount 8732
Figure 2-4. AC Transmitter
Power Connections
Connect Profibus PA
Wiring
The Profibus PA signal provides the output information from the transmitter.
Transmitter
Communication Input
The Profibus PA 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.
Field Wiring Power independent of the coil power supply must be supplied for Profibus PA
communications. Use shielded, twisted pair for best results. For new
installations or to get maximum performance, twisted pair cable designed
especially for Profibus should be used. Table 2-1 details cable characteristics
and ideal specifications.
Table 2-1.
Ideal Cable Specifications for
Profibus 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 135 to 165 (150 Nominal)
Wire Size 22 AWG (0,34 mm
2
)
Shield Coverage 90%
Loop Resistance < 110 /km
Capacitance < 30 pF/km