The Interface Solution Experts
9
HIM
Smart HART
Loop
Interface and Monitor
Figure 5.
Bench Checking the HIM Using the Transmitter
Excitation (+TX) Terminal to Power a Transmitter
Figure 6.
Bench Checking the HIM Without Using the
Transmitter Excitation (+TX) Terminal to Power a Transmitter
Bench Checking the HIM
If you would like to configure the HIM before
attaching it to the loop, you need to hook it up
with the equipment listed in Table 1. Refer to
Figures 5 and 6 for instructions on how to bench
check the HIM either with or without taking
advantage of the Transmitter Excitation (+TX)
terminal. If you need further descriptions of the
terminals, see Table 2.
READY
INPUT
TRIP 2
TRIP 1
COM
0
ADDR
For a HART Transmitter, the
resistor must be >250
and <1100 ohms
.
For a HART Receiver, such as a
valve positioner, no resistor is necessary.
HART
Field Device
or
Simulator
Sensor
Input
Optional
Optional
Checks for
continuity
24Vdc
Power
R
+IN
NO
NC
DC
GND
COM
–IN
+
+
–
–
+
–
+
–
Multimeter
Multimeter
24Vdc
Power
DCC
READY
INPUT
TRIP 2
TRIP 1
COM
0
ADDR
Optional
Checks for
continuity
NO
NC
DC
GND
COM
+
–
+
–
Multimeter
Multimeter
24Vdc
Power
DCC
HART
Field Device
or
Simulator
Sensor
Input
Equipment Hook-Up
for HART field device using
Transmitter Excitation
R
+TX
–IN
+IN
+
–
R must be > 250 and <1100 Ohms
