Samson 3730 Series - Page 84

5-46 EB 8384-3 EN
Installation
and positioner (interfacing as for positioner
connected in hazardous areas). See
Fig.5-32.
If the positioner is used in hazardous areas,
anexplosion-protectedisolationamplier
must to be used.
Using the HART
®
protocol, all connected
controlroomandeld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.
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.
22 mF
250 Ω
Controller/controlstation
Fig.5-33: Adapting the output signal
Note