Fluid Components International ST100 Series HART - Manual (Page 8)

ST100 Series HART
4 Fluid Components International LLC
Topology and Network Configuration
The ST100 supports Multidrop topology. In multidrop operation, the devices exchange data and measured values only via the HART protocol/HART
Network. In Network configuration the analog current signal serves just to energize the two-wire devices, providing a current of 4 mA per instrument.
In multidrop mode, up to 15 field devices are connected in parallel to a single wire pair or segment (Figure 4). The host distinguishes the field devices
by their preset addresses that range from 1 to 255. The factory preset address is 0.
Figure 4 - Multidrop Mode with HART Transmitters
Power Supply
(-) (+)
HART Master
Resistor
DCS/PLC
C01077-1-1
ST100 UNIT #2 ST100 UNIT #1
+
-
+
-
250 Ω