5.3.3.2 TwoStateDiscreteType
This VariableType defines the general characteristics of a DiscreteItem that can have two states. The TwoStateDiscreteType derives from the DiscreteItemType. It is formally defined in Table 9.
| Attribute | Value | ||||
| BrowseName | TwoStateDiscreteType | ||||
| IsAbstract | False | ||||
| ValueRank | −2 (−2 = ‘Any’) | ||||
| DataType | Boolean | ||||
| References | NodeClass | BrowseName | DataType | TypeDefinition | ModellingRule |
|---|---|---|---|---|---|
| Subtype of the DiscreteItemType defined in 5.3.3; i.e. the Properties of that type are inherited. | |||||
| HasProperty | Variable | TrueState | LocalizedText | PropertyType | Mandatory |
| HasProperty | Variable | FalseState | LocalizedText | PropertyType | Mandatory |
| Conformance Units | ||||||
|---|---|---|---|---|---|---|
| Data Access TwoState |
TrueState contains a string to be associated with this DataItem when it is TRUE. This is typically used for a contact when it is in the closed (non-zero) state.
FalseState contains a string to be associated with this DataItem when it is FALSE. This is typically used for a contact when it is in the open (zero) state.
If the item contains an array, then the Properties will apply to all elements in the array.
The StatusCode SemanticsChanged bit shall be set if any of the FalseState or TrueState Properties are changed (see 5.2 for additional information).