Rockwell Automation FactoryTalk Historian Classic User Guide - Manual (Page 35)

Collecting FactoryTalk Historian Classic Data Chapter 3
1. The Transaction Storage options allow you to specify how the
data will be stored to the database.
• Cache Transaction File—The FactoryTalk Transaction
Manager will write data values to a file for a specified period
of time or a specified number of transactions. When the file
reaches the specified limit, the Enterprise Connector reads
and processes the records in the file. The Cache
Transaction File option is most appropriate for transactions
that will be logged very often, such as a Scheduled data
point that will be collected every 10 seconds or less.
• Real Time Thread—The FactoryTalk Transaction
Manager will send a message to the Enterprise Connector
for each transaction as it is processed. The Real Time
• Thread option is most appropriate for transactions that will
not be logged very often; for example, an unscheduled data
point that triggers a transaction when its
• The value changes and where the value of that data point
changes infrequently.
Accept the default Cache Transaction File option.
2. The Transaction Timeout fields allow you to control how long
FactoryTalk Transaction Manager will wait for the transaction
to complete before logging an error. The transaction timeout
should be set slightly higher than the length of time it will take
for the data points to be collected, or be set to the length of
time after which the transaction is no longer valid. For
example, if a transaction should complete in 5 seconds but
might take as long as 7 seconds and still be acceptable, you
should set the transaction timeout to 8 seconds. If the
transaction goes past 8 seconds, the transaction will fail, and an
error will be logged.
Accept the default value of 60 seconds.
• Click Next to continue.
Rockwell Automation Publication HIST-UM001K-EN-E-June 2014 35