The Interface Solution Experts
13
HIM
Smart HART
Loop
Interface and Monitor
HART Device Info
This box displays the identification and revision
information of the monitored HART instrument.
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 Parameters
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 9.
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 appear-
ance of the display when certain values are sensed.
Value Display
12345 12345
1234500 1.23E06
-500000 -5.00E05
