How can I detect when a Remote Domain is down via XObject?
Solution:
To do so, follow these procedures:
1. Create an XObject, and insert three properties in it: Quality (Integer), Status (Boolean) and PLCTag (I/O Tag).
2. In the XObject, create a Data Folder, and insert an internal tag named Quality into it.
3. Set up the Quality internal tag’s Value properties as Integer.
4. Create a simple link between the Quality internal tag’s Value property and the XObject’s PLCTag’s Value property .
5. Create a reverse link between the Quality internal tag’s Quality property and the XObject’s Quality property.
6. Write the following script in the OnPropertyChanged event of the XObject’s Quality property:
STATUS = false
else
STATUS = true
end if
7. Create an XObject’s instance in the Project and link its PLCTag property to a Remote Domain’s I/O Tag, without selecting any property of the remote I/O Tag.
8. The variation of the XObject’s instance’s Status property will be used to indicate the Remote Domain’s behavior: if False, the connection to the Remote Domain is bad; if True, the connection to the Remote Domain is OK.
