.Reference Dotfield
- Last UpdatedNov 07, 2016
- 1 minute read
You can implement Dynamic Reference Addressing by assigning a valid reference to the .Reference dotfield of an I/O tag. You can use the .Reference dotfield to dynamically change the data source by modifying the characteristics of the Access Name assigned to the I/O tag.
The syntax of the .Reference dotfield is:
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tag.Reference="accessname.item" |
Changes the Access Name and item assigned to a tag. |
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tag.Reference="[.]item" |
Changes the item assigned to an I/O tag. |
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tag.Reference="accessname." |
Changes the Access Name of an I/O tag. |
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tag.Reference="" |
Deactivates the I/O tag. |
Each I/O type tag has a .ReferenceComplete dotfield. The value of this discrete dotfield indicates if the item requested in the .Reference dotfield is reflected in the .Value dotfield.
The .ReferenceComplete field is set to false (0) when the application starts in WindowViewer. When it is confirmed that the .Value dotfield is being updated by the source specified in the .Reference dotfield, the .ReferenceComplete value is set to true (1). If the .Reference dotfield is changed, the .ReferenceComplete dotfield is automatically set to false (0), and then updated to true (1) when the new value is updated.