Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 81
FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA) Chapter 1
Suppress or Disable Alarms
Suppress alarms to remove alarms you know exist from the HMI but still keep the
alarms alive. This lets you clear the alarm summary while you are resolving a
known alarm without continuing to view alarm information. A suppressed alarm
does not appear on the operator summary or banner screens, but a suppressed
alarm is still sent to subscribers, logged in the historical database, able to
transition alarm status, time stamped, and responsive to other programmatic or
operator interactions:
· When an alarm is Suppressed, it continues to function normally, monitor
the In parameter for alarm conditions, and respond to Acknowledge
requests. All subscribers are notified of this event, and any alarm messages
generated while the alarm is in the Suppressed state include the Suppressed
status. Alarm clients can respond differently to Suppressed alarms. For
example, suppressed alarms can be logged to the historical database but not
annunciated to the operator.
· When an alarm is Unsuppressed, all subscribers are notified and alarm
messages to subscribers no longer include the Suppressed status.
Disable an alarm to treat the alarm as if it does not exist in the control program. A
disabled alarm does not transition alarm status or get logged in the historical
database. A disabled alarm is still tracked, and can be re-enabled, in the Alarm
Status Explorer in FactoryTalk View SE software:
· When an alarm is Disabled, all of its conditions are set to the initial state
(InAlarm is cleared and Acked is set). The In parameter is not monitored
for alarm conditions. All subscribers are notified of this event.
· When an alarm is Enabled, it begins to monitor the In parameter for alarm
conditions. All subscribers are notified of this event.
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