Data transfer considerations

When using the data transfer functionality, pay attention to the following considerations:
Monitoring connections
The data transfer continuously monitors the connection to the FactoryTalk Historian SE or PI server. If the connection is lost, the data transfer service sends an error message to the system log (see System log related issues), and records the timestamp in the point ID mapping table as a reference for transferring data when the connection is restored.
The data transfer service may not restart if the Ethernet connection is lost or if there is a power loss. When power is restored, the data transfer may not reconnect to the server. In such cases, it may be required to restart the data transfer manually.
Transferring data to a new FactoryTalk Historian SE or PI server
If the data is to be transferred to a new FactoryTalk Historian SE or PI server, the data transfer service needs to build a new point ID mapping table using the tag information in the data storage service.
Processing tag data
FactoryTalk Historian ME processes new and existing point data:
  • New points
    For new event data from the data storage service, if the point ID is not in the point ID mapping table, the data transfer service gets the point ID from FactoryTalk Historian ME, and sends a request to the FactoryTalk Historian SE or the PI server to add a new point. The server responds with a unique point ID. This information is added to the point ID mapping table. After the entry has been created, the data transfer uploads the data to the server.
  • Existing points
    For new event data from the data storage service, if the point ID is found in the point ID mapping table, the data transfer uploads the data to the FactoryTalk Historian SE or PI server. The timestamp is recorded in the point ID mapping table.
Stopping the data transfer service
When the data transfer receives a shutdown signal from the FactoryTalk Historian ME system, the signal is recorded in the system log, and the status of the service on the
Data Transfer
 page is changed from
Running
 to
Stopped
.
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