22
1980
2010
-0
2
24
Installation
Control loop with communication resistor
In this configuration, the field device is powered externally by a PLC, Remote I/O or DC
power supply and outputs a 4 ... 20 mA signal. Alternatively it is used in HART multidrop
mode. The adapter provides the following functions:
•
HART digital communication.
Existing installations
: For existing installations, we recommend that the adapter is wired
as shown in the following figure (view Figure 3.10 on page 24):
Figure 3.10: Connection of adapter to a control loop with communication resistor
New installations
: For new installations, we recommend that the adapter is wired as
shown in the following figure (view Figure 3.11 on page 24):
Figure 3.11: Alternative method of connection of adapter to a control loop with communication resistor
Note!
•
The circuits in the following 2 figures are electrically identical as Terminal 4 is connected
internally to Terminal 5 and Terminal 3 is connected internally to Terminal 6 (view
Figure 3.10 on page 24, view Figure 3.11 on page 24).
1
PLC, Remote I/O, DC power supply with communication resistor
2
Field device
1
PLC, Remote I/O, DC power supply with communication resistor
2
Field device
1 2 3 4 5 6
HART
1
1 2 3 4 5 6
HART
1
