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The timestamp for a tag read from a PLC will be the timestamp assigned by the PLC and associated Ignition driver.

This timestamp will be passed to the Ignition tag and delivered via MQTT Transmission to MQTT Engine.

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• When an OPC tag is restarted, the timestamp at Edge will reflect the last known change timestamp from the PLC whilst Engine will reflect the timestamp of the restart. 

Add Injector example 

Timestamps are in UTC and displayed converted to local time

Common Issue with tag timestamps

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