The Interface Solution Experts
19
HIM
Smart HART
Loop
Interface and Monitor
HART Additional Status Alarm Bits
HART Additional Status also called “More Status” and
“Command 48” is where device manufacturers install
the custom diagnostics for the specific device. For
your particular application, you may choose all of these
diagnostics to cause the HIM relay to trip or just one
diagnostic bit to trip the HIM relay (or any combination
in between). The manufacturer of the HART device will
be the source for the specific diagnostic information.
Selecting the
Field Device Fault Alarm
function in the
Alarms
screen allows you to enable the HIM to set
alarm states, when in fault mode, based on the bit
settings of the additional status information returned
by certain HART instruments. This provides flexibility
to the requirement of alarming on additional status
information.
Choosing this feature, you are given the ability to spec-
ify the bit(s) on which to alarm. To access this feature,
check the
Additional Status
box. The
Edit
button will
appear in the
HART Additional Status Bits
section of
the screen. Clicking the
Edit
box brings up the
Addi-
tional HART Status Alarm Bits Settings
window (Figure
11). Check the box(es) that correspond to the bits you
wish to use; click
OK
.
Download the information to your instrument once you
are finished.
Figure 12.
Additional HART Status Alarm Bits Settings Window
Read & Quick Set Buttons
The
Read
button causes the PC Configuration
Software to read the alarm information from the
attached HIM; The
Quick Set
button causes the
software to configure the HIM’s alarm settings to
match those currently entered in the PC Software.
