The interface class “InterlockingVariableInterface” shall be used in order to reference variables representing an interlocking condition in external PLCopen XML document.

The InterlockingVariableInterface is formally defined in Table 37.

Table 37 - InterlockingVariableInterface Definition

Attribute

Value

BrowseName

InterlockingVariableInterface

IsAbstract

False

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

Inherit the components of the VariableInterface

HasProperty

Variable

ID

BaseDataType

PropertyType

Optional

HasComponent

Variable

SafeConditionEquals

Boolean

BaseDataVariableType

Optional

HasProperty

Variable

Version

BaseDataType

PropertyType

Optional

SafeConditionEquals indicates which value of the reference variable indicates a save state. Values are

  • “TRUE”: indicates that the value “TRUE” of the variable within the PLCopen XML description represents the safe state of the signal group.
  • “FALSE”: indicates that the value “FALSE” of the variable within the PLCopen XML description represents the safe state of the signal group.

Note: Use of the attribute is optional, default value is TRUE