Rockwell Automation FactoryTalk Transaction Manager User Guide - Manual (Page 135)

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C HANGING THE T RANSACTION C ACHE F ILE P ATH
To change the transaction cache file, select the configuration name, and then
select Configuration > Properties. From the Cache tab on the
Configuration Properties dialog box, double-click the connector to change
the file path.
The transaction cache file must reside on the same computer as the FactoryTalk
Transaction Manager service.
C HANGING THE E RROR L OG F ILE P ATH
To change the error log file, select the Error Log tab from the Configuration
Properties dialog box and change the file path in the field.
You can store the error log files on the remote FactoryTalk Transaction Manager
computer; this may help to reduce network traffic. Unfortunately, you may not be able
to view those log files from the local FactoryTalk Transaction Manager computer; in
this case, view the files directly on the remote FactoryTalk Transaction Manager
computer.
Data Point Buffering
Simple logging applications include many locations for buffering data. This
means that the potential exists for discrepancies between the values in your
controller and the values in your database. The following sections describe
different areas where data point buffering can be used.
B UFFERING I N THE C ONTROLLER
Values may change between scans, or more likely, the data server may read
a series of related values while the controller is updating them. In this case,
the values will not be synchronized. This problem can be solved by either
blocking the data into a single message sent by the controller or by making
sure that the controller does not trigger the transaction until all the values are
set. You should also use a transaction result to alert the controller that the
values have been read and can now be changed.