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PLC > Edge > MQTT Server > MQTT Engine module
The timestamp for a an Edge tag read from a PLC will be the timestamp assigned by the PLC and associated Ignition driver. This
The timestamp for any other Edge tag will be the Ignition server OS time for change in Qualified Value (Value, Quality or Timestamp)
All timestamps published on the wire are in UTC and displayed converted to local time passed to the Ignition tag and delivered via MQTT Transmission to MQTT Engine.
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:
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In a Transmission/Injector BIRTH message
OPC Tag Disabled
OPC Tag Enabled
OPC Restart Tag
Add Injector example
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