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Active Setpoint
The term Active Setpoint is used to describe the cur-
rently selected setpoint when the instrument is in con-
troller mode. Controllers can use the Main local setpoint
and/or the Alternate Setpoint. Only one of the setpoints
can be active at any time. During profiler control, the
setpoint value is controlled by the profiler function.
Also refer to: Actual Setpoint; Alternate Setpoint; Con-
troller Mode; Local Setpoints; Profiler Mode; Remote
Setpoint; Setpoint; and Setpoint Selection.
Actual Setpoint
Actual Setpoint is the effective current value of the ac-
tive setpoint. This will be different to the setpoints tar-
get value during setpoint ramps. The actual setpoint
will rise or fall at the ramp-rate set, until it reaches its
target setpoint value. During profile control, the actual
setpoint value is controlled by the profiler function.
Also refer to: Active Setpoint; Controller Mode; Profiler
Mode; Setpoint; Setpoint Ramp Rate and Setpoint Se-
lection.
Alarm Activation Inhibit
Alarm Inhibit prevents unwanted alarm activation at
power-up or when the controller setpoint is changed.
The alarm activation is inhibited until a ‘Safe’ (non-
alarm) condition is present. The alarm operates nor-
mally from that point onwards. E.g. if inhibited, a low
alarm will not activate at power-up, until the process
has first risen above the alarm point and then falls back
below. This parameter is in addition to the alarm mini-
mum duration setting.
Also refer to: Alarm Duration Inhibit; Alarm Types and
Alarm Operation.
Alarm Configuration
A sub-menu of the configuration menu, used to adjust
the alarm parameters (alarm types, values, hysteresis,
minimum duration and inhibiting).
Also refer to: Alarm Hysteresis; Alarm Inhibit; Alarm
Operation; Alarm Types and Configuration Mode.
Alarm Duration Inhibit
An adjustable alarm configuration time. After an alarm
trigger point is passed, the alarm is inhibited from acti-
vation until this time has elapsed. If the alarm trigger is
removed before the time has passed (e.g. the process
falls back below a high alarm value) the alarm will not
activate at all. The time duration inhibit is not applied
when an alarm condition ends. This parameter is in ad-
dition to the alarm activation inhibit.
Also refer to: Alarm Hysteresis; Alarm Inhibit; Alarm
Operation; Alarm Types and Configuration Mode.
Alarm Hysteresis
An adjustable band through which the process variable
must pass before the alarm will change state. The band
is always on the “safe” side of an alarm point, e.g. a
high alarm’s hysteresis band is below the high alarm
value, and a low alarm’s hysteresis is above the low
alarm value. Refer to the Alarm Hysteresis Operation
diagram on the next page.
Also refer to: Alarm Duration Inhibit; Alarm Types; Loop
Alarm; Alarm Operation; LSD; Process Variable; and
Rate Of Change Alarm.
21 Glossary
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