Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 122)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER ’ S G UIDE
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Connecting to a New FactoryTalk Historian SE or PI
Server
If the connection information in the Configuration service indicates a new
FactoryTalk Historian SE or PI server, the Data Transfer service needs to build a new
Point ID mapping table. The Data Transfer service uses the tag information in the
Data Storage service to build the new Point ID mapping table.
Failing to Connect
If the Data Transfer service fails to connect to the designated server, an error is
recorded and can be viewed in the system log.
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, 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, Data Transfer uploads the data to the
FactoryTalk Historian SE or PI 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
or PI 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.
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 server. User
intervention is required to monitor this condition and manually restart Data Transfer.