Alarm state Description Alarm condition* Alarm**
E Unacknowledged latched alarm No Active
F Acknowledged latched alarm No Active
*Note: The alarm condition that triggers the alarm, typically the Set point, may be present Yes or not present No.
**Note: Any alarm may be Active or Inactive in the system. If active the alarm Action is also active.
INFO
Inhibited, shelved, or out of service alarm states force the alarm to be Inactive in the system, even if the Alarm condition is
still present.
Automatic actions
The controller's alarm handling system can perform the following automatic actions:
• Horn/siren output
• Inhibit
• Auto acknowledge
• Control alarm state
• Suppress action
More information
See Horn outputs later in this chapter for more information on the alarm horn outputs.
Operator alarm actions
An operator can perform the following alarm actions:
• Acknowledge
• Shelve
• Out of service
• Latch reset
• Silence alarm horn/siren
INFO
Alarm actions are controlled by the group and user permissions.
4.4.2 Acknowledge
Alarms that have no Auto acknowledge require acknowledging by operator action. The operator must take action regarding the
alarm condition. The operator can mark the alarm as acknowledged.
INFO
Acknowledging an alarm has no influence on the alarm Action.
DESIGNER'S HANDBOOK 4189340911K UK Page 105 of 521
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