Table 8.1 Alarm list symbols
Symbol
Alarm
condition*
Alarm
action**
Acknowledge Notes
or
Active Active Unacknowledged
• Alarm condition is occurring.
• Alarm action is active.
• Alarm requires acknowledgement.
• Alarm requires action to clear the alarm condition.
or
Active Active Acknowledged
• Alarm condition is occurring.
• Alarm action is active.
• Alarm is acknowledged.
• Alarm requires action to clear the alarm condition.
or
Inactive Active Unacknowledged
• Alarm condition has cleared.
• Alarm action is active.
• Alarm requires acknowledgement.
• Alarm latch requires reset.
or
Inactive Active Acknowledged
• Alarm condition has cleared.
• Alarm action is active.
• Alarm is acknowledged.
• Alarm latch requires reset.
or
Inactive Inactive Unacknowledged
• Alarm condition occurred but has cleared.
• Alarm action is inactive.
• Alarm requires acknowledgement.
or
Inactive Inactive - Normal state.
or
Active or
Inactive
Inactive -
• Alarm has been shelved for a period of time.
• Alarm returns automatically after the period has
expired.
or
Active or
Inactive
Inactive -
• Alarm has been marked out of service for an
indefinite period.
• Alarm does not return automatically and requires
manual returning to service.
or
Active or
inactive
Inactive - Alarm has been inhibited from occurring.
*Note: Alarm condition is typically where the Set point has been exceeded.
**Note: Alarm action (protection) is the configured action taken to protect the situation. When active, this action occurs in the
controller. For example, the alarm action could be Trip breaker.
See
Protections, Alarm handling in the Designer's handbook for more information about alarm handling.
PPM 300 Operator's manual 4189340910 UK
www.deif.com Page 119 of 157
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