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  • When an OPC tag is disabled, the timestamp at Edge will reflect the time the tag was disabled.
  • The associated DDATA message will reflect the timestamp of the disabled tag change event.

OPC Tag Enabled

  • When an OPC tag is enabled, the timestamp at Edge will reflect the last known change timestamp from the PLC.
  • The associated DDATA message will reflect the timestamp of the enabled tag change event.

OPC Restart Tag

  • When an OPC tag is restarted, the timestamp at Edge will reflect the last known change timestamp from the PLC.
  • The associated DDATA message will reflect the timestamp of the tag restart event. 


Note

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

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 at the receiving application.

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