Manual

<2. Connection>
2-4
IM 01C25T01-06EN
2.5 Interconnection Between
DPharp and the HART
Conguration Tool
The HART conguration tool can interface with the
transmitter from the control room, the transmitter
site, or any other wiring termination point in the
loop, provided there is a minimum of 250 Ω
between the connection and the power supply. To
communicate, it must be connected in parallel with
the transmitter; the connections are non-polarized.
Figure 2.2 illustrates the wiring connections for
direct interface at the transmitter site for the
DPharp. The HART conguration tool can be used
for remote access from any terminal strip as well.
USB
FieldMate
Modem
Relaying
terminals
Distributor
Control room
Terminal
board
F0202.ai
USB
PC/FieldMate
HART configuration tool
DPharp
SUPPLY
PULSE
CHECK
ALARM
Figure 2.2 Connecting the HART Conguration
Tool
2.6 Power Supply Voltage and
Load Resistance
When conguring the loop, make sure that the
external load resistance is within the range in the
gure below.
(Note) With an intrinsically safe transmitter, external load
resistance includes safety barrier resistance.
600
250
0 10.5 16.6 25.2 42
External
load
resistance
R (Ω)
Power supply voltage E (V DC)
F0203.ai
Communication
applicable range
R=
E–10.5
0.0244
Figure 2.3 Relationship between Power Supply
Voltage and External Load Resistance