The state of alarms is affected by the state of the process, equipment, system or plant. For example, when a tank is taken out of service, the level alarms associated with the tank would be no longer used, until the tank is returned to service. This section describes ReferenceTypes that can be used by a StateMachine to indicate that a specific Effect on Alarms caused by the transition of a StateMachine. StateMachines that describe the state of a process, system or equipment can vary, but an example StateMachine is provided in Annex F.

The HasEffectDisable ReferenceType is a concrete ReferenceType and can be used directly. It is a subtype of HasEffect.

The semantic of this ReferenceType is to point form a Transition to an Alarm that will be disabled.

The SourceNode of this ReferenceType shall be an Object of the ObjectType TransitionType or one of its subtypes. The TargetNode can be of an Object or AlarmType.

The representation of the HasEffectDisable ReferenceType in the AddressSpace is specified in Table 138

Table 138 – HasEffectDisable ReferenceType

Attributes

Value

BrowseName

HasEffectDisable

InverseName

MayBeDisabledBy

Symmetric

False

IsAbstract

False

References

NodeClass

BrowseName

Comment

ConformanceUnits

A & C StateMachine Trigger

The HasEffectEnable ReferenceType is a concrete ReferenceType and can be used directly. It is a subtype of HasEffect.

The semantic of this ReferenceType is to point form a Transition to an Alarm that will be enabled.

The SourceNode of this ReferenceType shall be an Object of the ObjectType TransitionType or one of its subtypes. The TargetNode can be of any NodeClass.

The representation of the HasEffectEnable ReferenceType in the AddressSpace is specified in Table 139

Table 139 – HasEffectEnable ReferenceType

Attributes

Value

BrowseName

HasEffectEnable

InverseName

MayBeEnabledBy

Symmetric

False

IsAbstract

False

References

NodeClass

BrowseName

Comment

ConformanceUnits

A & C Statemachine Trigger

The HasEffectSuppressed ReferenceType is a concrete ReferenceType and can be used directly. It is a subtype of HasEffect.

The semantic of this ReferenceType is to point form a Transition to an Alarm that will be suppressed.

The SourceNode of this ReferenceType shall be an Object of the ObjectType TransitionType or one of its subtypes. The TargetNode can be of any NodeClass.

The representation of the HasEffectSuppressed ReferenceType in the AddressSpace is specified in Table 140

Table 140 – HasEffectSuppressed ReferenceType

Attributes

Value

BrowseName

HasEffectSuppressed

InverseName

MayBeSuppressedBy

Symmetric

False

IsAbstract

False

References

NodeClass

BrowseName

Comment

ConformanceUnits

A & C Statemachine Suppression Trigger

The HasEffectUnsuppressed ReferenceType is a concrete ReferenceType and can be used directly. It is a subtype of HasEffect.

The semantic of this ReferenceType is to point form a Transition to an Alarm that will no longer be suppressed.

  • If the Reference is to an Object then all Alarms in the HasNotifier hierarchy below that Object are removed from being suppressed,
  • If the target is an AlarmType then all instance of that AlarmType are no longer suppressed below the Object containing the StateMachine,
  • if the target is an Alarm instance then the given Alarm instance is no longer suppressed. No errors are logged if the Alarm was not suppressed.

The SourceNode of this ReferenceType shall be an Object of the ObjectType TransitionType or one of its subtypes. The TargetNode can be of any NodeClass.

The representation of the HasEffectUnsuppressed ReferenceType in the AddressSpace is specified in Table 141.

Table 141 – HasEffectUnsuppressed ReferenceType

Attributes

Value

BrowseName

HasEffectUnsuppressed

InverseName

MayBeUnsuppressedBy

Symmetric

False

IsAbstract

False

References

NodeClass

BrowseName

Comment

ConformanceUnits

A & C Statemachine Suppression Trigger