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In general, the Edge is the source of truth for tag timestamps although there are several events that will cause the timestamps to differ across the system:

On a Transmission/Injector BIRTH message

• The BIRTH message for each Edge Node and Device will set the timestamp associated with each tag to the current time of the MQTT Transmission server's OS.
• The timestamp at the Edge will show the last known timestamp from the PLC and Engine will display the timestamp included in the BIRTH message

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