Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 235)

Configuring data logging
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7–35
Specifying when to log data
You can set up logging so tag values are logged:
periodically (periodic logging)
only when a tag value changes (on–change logging)
when a particular event occurs and triggers the DataLogSnapshot
command (on–demand logging)
DataLogSnapshot <file> is the RSView32 command for logging
data for a single data log model on demand, where <file> is the
name of the data log model. Use the DataLogSnapshot *
command to log a snapshot of the data for all data log models that
are currently running.
You can combine types of logging. For more information, see
“Combining logging” on page 7-39.
To specify what should trigger logging:
1. In the Data Log Setup editor, click the Log Triggers tab.