AlarmStates

Contents

• AlarmStates
  • State transitions
  • Disabled States
  • IEC 62682: AlarmStates Definition and related Actions

State transitions

Alarm States and Severities are defined in panic.properties module.

With PyAlarm > 6.1; GUI will read the current Alarm state from the AlarmList attribute.

For compatibility with older versions, the events of ActiveAlarms will be used instead:

• If ActiveAlarms doesn’t cotain tag, alarm.active will be 0, state = NORM
• Activealarms contains tag, alarm.active = activealarms timestamp, state = ACTIVE
• ActiveAlarms is None or Exception, alarm.active will be set to -1. state = ERROR

Disabled States

Their meanings are:

• OOSRV = Device server is Off (not exported), no process running
• DSUPR = Enabled property is False
• SHLVD = Alarm is listed in DisabledAlarms attribute (temporary disabled)
• ERROR = Device is alive but the alarm is not being evaluated (exported=1 and thread dead or exception).

IEC 62682: AlarmStates Definition and related Actions

Different annunciators can be setup for each State change

Reset() can be automatic or forced to be manual

Reminder() : Alarm still ACTIVE, additional action can be configured

RTNUN : Condition recovered (but not Reset) Alarm ACTIVE : (UNACKED) Alarm ACKED : (action taken by operator) RTNUN: return to NORM NORM: after Reset() or not triggered

First peaks ignored if (t < polling*AlarmThreshold)

SHLVD, DSUPR, OOSRV: Unactive states.

SHELVED for temporary disabling,

DSUPR by process condition,

OOSRV is permanent (device disabled).

All of them are controlled by the Enable/Disable states/commands of PyAlarm.

In addition, PANIC adds ERROR State to raise problems with Tango devices.