6.6 Alarm configuration
Note
:
Alarm menus are only included when the
BA484DF-F is fitted with optional alarm outputs
.
Outputs are locally activated from the fieldbus
variables and are configured via the instrument
menus and push buttons.
They cannot be
controlled via the fieldbus.
Each of the six alarms may be linked to any one of
the eight fieldbus variables displayed by the
BA484DF-F.
Each
alarm
output
can
be
conditioned to function as a high or a low alarm, or
as a combined high and low alarm. The output can
be conditioned as normally open ‘N/O’, or normally
closed
‘N/C’
in
the
non-alarm
condition.
Irrespective of settings alarm outputs will be open
when the instrument is not powered from the
fieldbus.
When an alarm is activated, the associated
fieldbus variable display flashes, i.e. alternates
between dark figures on a light background and
light figures on a dark background.
There are eight alarm-conditioning sub-menus.
6.6.1 Alarm summary
Shows to which fieldbus variable each alarm is
linked and how each alarm has been conditioned
i.e. high, low, or combined high & low alarm with
normally open or closed output.
No adjustments
can be made in this sub-menu.
6.6.2 Alarm activation
Fieldbus variables that have not been validated are
displayed with dark characters on a light
background, and some screen formats also
contain a status indication. This sub-menu allows
the alarm outputs to be conditioned so that they
only operate with validated fieldbus data, or to
operate irrespective of data validity.
6.6.3 Alarm output
There is a separate sub-menu for each of the six
alarm outputs; these link the alarm to one of the
displayed fieldbus variables and define the alarm
function and the setpoints.
To link the alarm to a displayed variable, position
the cursor over the ‘IN_n’ field, press
P
and using
the
▼
or
▲
button select the required input
source.
Enter the selection by pressing the
E
button.
Each alarm output can be N/O or N/C in the non-
alarm condition. To change the setting, position
the highlight over the ‘N/O’ or ‘N/C’ field, press
P
and use the
▼
or
▲
button to toggle the setting.
Enter the selection by pressing the
E
button.
Each alarm has three functions that can be
independently enabled to condition the output as a
low or high alarm, or as a combined low and high
alarm, either with or without hysteresis.
The required functions can be individually enabled
by positioning the highlight over the Enb/Dis
(Enabled/Disabled)
column,
pressing
P
and
toggling the function to the required state, then
entering the selection by pressing the
E
button.
Alarm setpoints are entered digit by digit.
Place
the highlight over the setpoint to be adjusted and
press
P
;
the flashing digit to be adjusted may then
be selected by again pressing
P
. When all the
digits have been adjusted, operating the
E
button
enters the value and moves the menu up one
level.
The function of all alarms may be reviewed from
the alarm summary menu - see 6.6.1.
13
Summary of Contents for FOUNDATION BA484DF-F
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