The Interface Solution Experts
15
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 infor-
mation.
Choosing this feature, you are given the ability to
specify 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
Additional 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 11.
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.
