Samson 3730 Series Mounting And Operating Instructions page 84

Installation
and positioner (interfacing as for positioner
250
connected in hazardous areas). See
Fig. 5-32.
22 mF
If the positioner is used in hazardous areas,
Controller/control station
an explosion-protected isolation amplifier
must to be used.
Using the HART protocol, all connected
®
Fig. 5-33: Adapting the output signal
control room and field units can be ad-
dressed individually using a point-to-point
connection or the standard (multidrop) bus.
Point-to-point:
The bus address/polling address must al-
ways be set to zero (0).
Standard bus (multidrop):
In the standard bus (multidrop) mode, the
positioner follows the analog current signal
(set point) in the same way as for point-to-
point communication. This operating mode
is, for example suitable for split-range oper-
ation of positioners (series connection).
The bus address/polling address has to be
within a range of 1 to 15.
Note
Communication errors may occur when the
process controller/control station output is
not HART -compatible.
®
Alternatively, a 250 Ω resistor can be con-
nected in series and a 22 µF capacitor can
be connected in parallel to the analog out-
put. The load for the controller output will in-
crease as a result.
5-46 EB 8384-3 EN