The ExclusiveLimitStateMachineTypedefines the state machine used by AlarmConditionTypesthat handle multiple mutually exclusive limits. It is illustrated in Figure 19.
Figure 19– ExclusiveLimitStateMachineType
It is created by extending the FiniteStateMachineType. It is formally defined in Table 93and the state transitions are described in Table 94.
Table 93– ExclusiveLimitStateMachineType definition
|
Attribute |
Value |
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|
BrowseName |
ExclusiveLimitStateMachineType |
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|
IsAbstract |
False |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
Subtype of the FiniteStateMachineType |
|||||
|
HasComponent |
Object |
HighHigh |
|
StateType |
|
|
HasComponent |
Object |
High |
|
StateType |
|
|
HasComponent |
Object |
Low |
|
StateType |
|
|
HasComponent |
Object |
LowLow |
|
StateType |
|
|
HasComponent |
Object |
LowToLowLow |
|
TransitionType |
|
|
HasComponent |
Object |
LowLowToLow |
|
TransitionType |
|
|
HasComponent |
Object |
HighToHighHigh |
|
TransitionType |
|
|
HasComponent |
Object |
HighHighToHigh |
|
TransitionType |
|
|
ConformanceUnits |
|||||
|
A & C Exclusive Limit |
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Table 94– ExclusiveLimitStateMachineType Additional References
|
SourceBrowsePath |
References |
IsForward |
TargetBrowsePath |
|
HighHighToHigh |
FromState |
True |
HighHigh |
ToState |
True |
High |
HasEffect |
True |
AlarmConditionType |
|
HighToHighHigh |
FromState |
True |
High |
ToState |
True |
HighHigh |
HasEffect |
True |
AlarmConditionType |
|
LowLowToLow |
FromState |
True |
LowLow |
ToState |
True |
Low |
HasEffect |
True |
AlarmConditionType |
|
LowToLowLow |
FromState |
True |
Low |
ToState |
True |
LowLow |
HasEffect |
True |
AlarmConditionType |
‘
The component Variablesof the ExclusiveLimitStateMachineTypehave additional Attributesdefined in Table 95.
Table 95– ExclusiveLimitStateMachineType Attribute values for child Nodes
|
BrowsePath |
Value Attribute |
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|
1 |
||
|
2 |
||
|
3 |
||
|
4 |
||
|
34 |
||
|
43 |
||
|
21 |
||
|
12 |
The ExclusiveLimitStateMachineTypedefines the sub state machine that represents the actual level of a multilevel Alarm when it is in the Activestate. The sub state machine defined here includes High, Low, HighHighand LowLowstates. This model also includes in its transition state a series of transition to and from a parent state, the inactive state. This state machine as it is defined shall be used as a sub state machine for a state machine which has an Activestate. This Activestate could be part of a “level” Alarmor “deviation” Alarmor any other Alarmstate machine.
The LowLow, Low, High, HighHighare typical for many industries. Vendors can introduce sub-state models that include additional limits; they may also omit limits in an instance. If a model omits states or transitions in the StateMachine, it is recommended that they provide the optional Property AvailableStatesand/or AvailableTransitions(see 10000-16).