The Interface Solution Experts
17
HIM
Smart HART
Loop
Interface and Monitor
HART Device Status
The HART Device Status box displays the current
status of the monitored HART transmitter. In a small
double-box, the software displays the code (hex
number) associated with the status.
Variables
The device will monitor up to the first four HART
variables sent by your transmitter. This portion of the
screen displays those variables and the Loop Current.
HART Device Range & Limits
This portion of the screen displays the range and the
sensor limits of the monitored HART transmitter.
Display Tab
The
Display
tab configures the HIM’s LCD display. To
program the Display parameters, change the settings
in the
Display Source
box, then press
Quick Set
. See
the following descriptions of the various sections of the
screen.
Figure 10.
Display Tab
Toggle, Variable List
The
Toggle
checkbox causes the HIM to sequentially
display two HART variables in five second increments.
Directly below the
Toggle
checkbox are two list boxes
to select the variables that you would like to be
displayed. Notice that if you select a scaled variable, it
is important to check on the
Scaling
page to verify that
you have set all of the scaling parameters.
Use Custom Label
The
Custom Label
is used to display a calculated or
scaled variable. Clicking the
Use Custom Label
box
causes the HIM to always display the custom label as
Engineering Units (EGUs).
Precision
The
Precision
buttons allow you to change the number
of decimal places displayed by the HIM.
Quick Set
The
Quick Set
button programs the HIM with the
information on the Display page.
Display Format
The HIM reads the dynamic process variable
supported by HART sensors. Generally, the HIM’s
LCD displayed values range from -99999 to 99999.
Occasionally, these process variable values may
extend past this range. To improve the displayed
readings, values below -XXXXX and above XXXXX are
translated into exponential form. Below is an example
of the appearance of the display when certain values
are sensed.
Value
12345
1234500
-500000
Display
12345
1.23E06
-5.00E05
