A tag with Device as its data source receives its data from a source external to FactoryTalk View, that is, a programmable controller via RSLinx or from a third party OPC server, or another Windows program through an OPC server.
When you define the tag, you specify the address of the value in the programmable controller's data table, or its OPC item. The system then scans this location, and stores the value in the value table, making it available to the rest of the system.
This is the physical address in the programmable controller or the OPC item that this tag is associated with. For non-OPC tags, the address syntax depends on the programmable controller's addressing convention. The maximum length is 255 characters.
Important: |
Do not point an analog HMI tag to a Boolean device tag and also do not point a digital HMI tag to a non-Boolean device tag. |
Tip: |
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