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Chapter 4
Alarm System Recommendations
Maintenance Actions
Use the Disable state to inhibit the alarm for maintenance purposes (equivalent
to Out-of-Service state in ISA 18.2).
The Disable state is intended for Out-of-Service functionality under control of
maintenance in accordance with ANSI/ISA-18.2-2009. If logging of alarm
transitions during Disable is desired, the Suppress state of the ALMA or ALMD
can be used instead if not required for Suppress-by-Design functionality under
control of logic.
Alarm, Return to Normal, Latching, and Acknowledgement
While Disabled, Suppressed, or Shelved, an acknowledged alarm does not
become unacknowledged.
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Rockwell Automation Publication PROCES-RM001I-EN-P - September 2014