KROHNE IFC 100 Converter EN - Manual (Page 93)

DESCRIPTION OF HART INTERFACE
9
93
IFC 100
www.krohne.com 07/2010 - 4000041004 - MA IFC 100 R04 en
9.2.3 Multi-Drop connection (3-wire connection)
Connection of 2-wire and 4-wire devices in the same network. In order that the current output of
the signal converter is working continuously active, an additional third wire must be connected
to the devices in the same network. These devices must be powered via a two-wire loop.
1 Primary Master
2 HART
® modem
3 HART ® signal
4 2-wire external devices (slaves) with 4…20 mA, addresses > 0, powered by current loop
5 Signal converter terminals A (C)
6 Signal converter terminals A- (C-)
7 Connection of active or passive 4-wire devices (slaves) with 4…20 mA, addresses > 0
8 Load ≥ 250 Ω (Ohm)
9 Secondary Master
10 Power supply
.book Page 93 Friday, July 9, 2010 12:29 PM