Watlow F4T • 85 • Chapter 5 Function Reference
Silencing
Set whether or not the output can be returned to the non-alarm state (silenced) before the
input returns to the normal range. Silencing an alarm returns the alarm's output to its inactive
state without requiring the alarm state to be cleared. Once the alarm is silenced, the output
remains inactive until the alarm is cleared and the alarm condition reoccurs.
Options:
• Yes: alarm can be silenced by connecting a digital signal to SIL or by using the Silence
Alarm parameter
• No: alarm cannot be silenced. After an alarm occurs, the function’s output returns to
its non-alarm state only when the alarm is cleared
Latching
Select whether an alarm state is maintained (latched) or clears automatically when the pro-
cess value returns to an acceptable level.
Options:
• Latching: alarm remains active until the condition that caused it no longer exists and
the alarm is reset by the CLR receiver or the Clear Alarm parameter.
• Non-latching: alarm clears automatically once the condition that caused it no longer
exists.
Blocking
Alarm blocking allows a system to warm-up after being powered up or to be adjusted without
experiencing nuisance alarms. Set alarm blocking to prevent alarms before IN has first come
within the normal operating range.
Options:
• Both: alarms are blocked when the controller powers up and deviation alarms are
blocked when the loop's Set Point or the alarm's High Set Point or Low Set Point is
changed.
• Off: alarms are not blocked.
• Set Point: deviation alarms are blocked when the loop's Set Point or the alarm's High
Set Point or Low Set Point is changed.
• Startup: alarms are blocked when the controller powers up.
Display
Provides the ability to display alarm activity to the user interface (UI).
Options:
• On: when an alarm is active will cause the controller status bar on the UI to flash yel-
low.
• Off: when an alarm is active there will be no indication on the UI.
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