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Instruction Bulletin
Appendix J Rev. 1.2
May 2005
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices J-3
World Class 3000
INSTALLATION
J-4 HART COMMUNICATOR SIGNAL LINE
CONNECTIONS
The HART Communicator can connect to the
IFT analog output signal line at any wiring ter-
mination point in the 4-20 mA current loop.
There are two methods of connecting the HART
Communicator to the signal line. For applica-
tions in which the signal line has a load resis-
tance of 250 ohms or more, refer to method 1.
For applications in which the signal line load re-
sistance is less than 250 ohms, refer to
method 2.
a. Method 1, For Load Resistance > 250
Ohms
Refer to Figure J-2 and the following steps
to connect the HART Communicator to a
signal line with 250 ohms or more of load
resistance.
INTELLIGENT FIELD
TRANSMITTER IFT 3000
J1
JM1
J2
J3
J4
J5
J6
J7
J8
J9
LOOP
CONNECTORS
O 4-20 MA SIGNAL LINE
2
HART
COMMUNICATOR
MODEL 275/375
ANALOG OUTPUT DEVICE
HART COMMUNICATOR
REAR PANEL
JM8
3D39513G,REV13
MICROPROCESSOR
BOARD
10
J1
JM6
J2
J3
SW2
SW3
A
B
C
D
ON OFF
37840018
LEAD SET
RL 250Ω
>
MICROPROCESSOR
BOARD
CURRENT/VOLTAGE SELECTION SWITCH
TO "CURRENT" POSITION
INTERCONNECT BOARD
ANALOG OUTPUT
Figure J-2. Signal Line Connections, > 250 Ohms Load Resistance