...
- status process alarms: The alarm is active when the value of the object has a defined value (e.g. Boolean value - alarms PA_On, PA_Off) or the limit has a defined value (e.g. Integer value - alarms PA_HL, PA_VHL). This alarm can be configured to require acknowledgment - this means that the information about it will remain in the D2000 HI in the alarm management window even if it has already disappeared and the operator must confirm it.
If the alarm does not require acknowledgment, it will disappear spontaneously if the condition for its occurrence (value, limit) disappears. - transition process alarms: The alarm occurs when the value of the object changes to a defined value (e.g. Boolean value - alarms PA_ToOn, PA_ToOff) or when the limits change to a defined value (e.g. Integer value - alarms PA_ToHL, PA_ToVHL). This alarm must always be acknowledged requires acknowledgment (if it were not, it would disappear immediately).
...
Alarms are categorized by criticality to:
- non-critical (less important)
- critical (more important)
...
- Active process alarm (\ALF)
- Process alarm type (\ALV)
- Acknowledged process alarm (\ALQ)
- Process alarm value assignment time (\ALT)
- Indication of active critical alarm (\ALC)
Objects of Alarm type obtain the following values usable in expressions:
- @Normal
- @Alarm
- @Kvitt
- @Block
- @NoKvit
The number of active alarms in the system is given by the system variable ProcAlarmsNr.
The Signal_Trigger system variable generates a True pulse for alarms that have the "Raise SIGNAL" parameter enabled.
Note: also system user variables SystemError and SystemWarning with values of type text can be considered as "alarms" - their value has the critical alarm flag, the alarm type is SysPrAl and they are displayed in the user window for alarm management. These alarms are set by various processes of the D2000 system when multiple types of system errors occur (incorrect object configuration, duplicate address of the I/O tags, insufficient disk space). These are alarms intended for the system administrator.