6 OPC UA for Compressed Air Systems Information Model ToC Previous Next

This section introduces the “OPC UA Information Model for Compressed Air Systems – Main Control System”.

6.1 Model Overview ToC Previous Next

Figure 7 shows all ObjectTypes which are defined by this companion specification.

6.1.1 Variables ToC Previous Next

In most cases Variables have the TypeDefinition DataItemType or one of its subtypes. The optional Property Definition can be added to a Variable that uses such a TypeDefinition. This allows manufacturers to store a specific definition for each Variable.

Variables that use the DataType Boolean are modeled with the TypeDefinition TwoStateDiscreteType. Such Variables have the TrueState and FalseState Properties, which provide human readable and mandatory True and False states in their Value Attribute.

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