4
ELECTRICAL CONNECTIONS
42
IFC 050
www.krohne.com
09/2016 - 4002184003 - MA IFC 050 R03 en
4.11.4 HART
®
connection
Example for active HART
®
connection (point-to-point)
The parallel resistance to the HART
®
communicator must be R
≥
230
Ω
.
Example for passive HART
®
connection (multi-drop mode)
•
I: I
0%
≥
4 mA
•
Multi-drop mode I: I
fix
≥
4 mA = I
0%
•
U
ext
≤
32 VDC
•
R
≥
230
Ω
INFORMATION!
The current output always has HART
®
capability and is connected at connection terminals A+/A-
/A.
All HART
®
connections (point-to-point and multi-drop operation) both work actively and
passively.
Figure 4-18: HART
®
connection active (I
a
)
1
HART
®
communicator
Figure 4-19: HART
®
connection passive (I
p
)
1
HART
®
communicator
2
Other devices with HART
®
capability