Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 121)

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Processing Tag Data
The 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 the FactoryTalk Historian ME and sends a request to the FactoryTalk
Historian SE server to add a new point. The FactoryTalk Historian SE server
responds with a unique Point ID. This information is added to the Point ID
mapping table. After the entry has been created, Data Transfer uploads the data to
the FactoryTalk Historian SE server.

Existing Points - for new event data from the Data Storage service, if the Point ID
is found in the Point ID mapping table, Data Transfer uploads the data to the
FactoryTalk Historian SE server. The timestamp data is recorded in the Point ID
mapping table.
Monitoring Connections
Data Transfer continuously monitors the connection to the FactoryTalk Historian SE
server. If the connection is lost, Data Transfer sends an error message to the System
Log and records the time as a reference for transferring data when the connection is
restored.
To view the FactoryTalk Historian ME log, click Advanced in the top navigation bar,
and then click System Log in the left navigation bar.
Shutting Down the Data Transfer Service
When Data Transfer receives a shut down signal from the FactoryTalk Historian ME
system, it records it in the system log and changes its status on the Data Transfer page
to Stopped.
To view the FactoryTalk Historian ME log, click Advanced in the top navigation bar,
and then click System Log in the left navigation bar.
Note that Data Transfer may not restart if the Ethernet connection is lost or if there
is a power loss. When power is restored, Data Transfer may not reconnect to the
FactoryTalk Historian SE server. User intervention is required to monitor this
condition and manually restart Data Transfer.