Rockwell Automation FactoryTalk Historian Classic User Guide User Manual

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Collecting FactoryTalk Historian Classic Data Chapter 3

2. Set the scan rate to 15 seconds. This means we will be

collecting data every 15 seconds between the time the
configuration is started and the time the configuration is
stopped.

3. Click Next to continue.

Unscheduled transactions. Unscheduled transactions are triggered
by a change in the value of the data point that is being logged. The

FactoryTalk Transaction Manager Unscheduled Transaction dialog
box allows you to trigger the transaction when the data point value
goes high, low, or on any change in the data point value.

1. For our example, accept the default On Change option. This

option means that any time our data point value changes, a
value will be logged to the database.

2. Select the Specify Minimum Collection Frequency (MCF)

check box to create a scheduled transaction that will be paired
with your unscheduled transaction. The values from both
transactions will be logged to the same field in the database.
The data from the scheduled transaction will create a
“heartbeat” that will allow us to determine that the

Rockwell Automation Publication HIST-UM001K-EN-E-June 2014