Alarm states (values)
For the needs of documentation of alarms and relating activities of D2000 system, a term "alarm status" has been established, although actually it is "value of object of Alarm type". Alarms can be in various states, i.e. objects of Alarm type may acquire various values. An overview of the states of system alarms is shown in the following table
| Alarm status | Cause |
|---|---|
| A_Norm | Condition to start the alarm is not occurred. |
| A_Alarm | Condition to start the alarm occurred. |
| A_Kvit | Alarm acknowledged by an operator. |
| A_Block | Alarm was blocked by operator, or the option Blocked alarm is checked in the alarm configuration. |
| A_UnBlock | The process D2000 Alarm is not running and operator unblocked the alarm in the status A_Block (Blocked). |
| A_NoKvit | For the acknowledgement-required alarm, the condition to end the alarm was met before its acknowledgement. |
The system responds only to changes of these states. Conditions of changes of alarm states and activities corresponding to these changes must be defined for each object of Alarm type.
Changes of alarm states
| Alarm status change | Condition to change |
|---|---|
| Normal -> Alarm | Condition to start the alarm must be met. The condition is represented by an object of BOOLEAN type. Change into the state Alarm is subject to the time filter. |
| Alarm -> Acknowledged | Operator acknowledged the alarm. |
| Alarm -> Normal | Condition of ending an alarm must be met. If the condition is not defined, the condition of starting an alarm has to finish. If the alarm is defined as acknowledgement-required alarm, its status may not change from the state Alarm into the state Normal |
| Acknowledged -> Normal | Condition of ending an alarm must be met. If the condition is not defined, the condition of starting an alarm must finish. |
| Normal, Alarm, Acknowledged -> Blocked | Operator blocked the alarm. |
| Blocked -> Normal, Alarm | Operator unblocked the alarm. New alarm status (Normal or Alarm) depends on which state the alarm was raised in. |
| Alarm -> Unacknowledged | The condition of ending an alarm is met - for acknowledgement-required alarm. |
| Unacknowledged -> Normal | Operator acknowledged the acknowledgement - required alarm. |
| Unacknowledged -> Alarm | Condition of starting an alarm is met again - for acknowledgement-required alarm. |
The changes of alarm states are shown in the following figure.
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