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How are the PLC variables polled in Vijeo Designer?

Variables such as Alarm Variables, Data Logging Variables, Script Variables, or Web Gate shared variables are classified as Persistent Scan variables. These are always updated behind the scenes regardless of the panel you are visiting. 

Panel variables are only scanned when the panel they exist on is visited. If they are not used in alarms, data logging, script, or web gate, then they are not updated or scanned until the next time the panel is loaded.
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