Field Xpert
3 Function and System Design
Hauser
11
3.2.4
WiFi – HART multiplexer connection via Fieldgate
Fig. 3-6 shows the equipment architecture for an HART multiplexer connection. The RS-485
interface for Fieldgate FXA520 can be used for connecting up to two HART multiplexers, e.g. the
KFD2-HMM-16 from Fuchs. Up to 30 HART devices can be connected in this way. If the
devices are used in a safe area, the RNS221 transmitter power supply can be used to power two
devices. Ex devices can also be installed in hazardous areas. In this case, the signal must be
connected to the safe side of a RN221N-B transmitter power supply.
Fig. 3-6: Equipment architecture for HART multiplexer connection
RS-485
Master
Master
e.g.
RNS221
RS-485
Fieldgate
FXA520
.
maximum 15 devices
HART-Multiplexer
e.g. P Fuchs
KFD2-HMM-16
HART-Multiplexer
e.g. P Fuchs
KFD2-HMM-16
maximum 15 devices
e.g.
RN221N-B
-
SCADA visualization
F5
F1
F2
F3
F4
OK
WiFi
access
point
Field Xpert
Ethernet
15 16
02 01