Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 59)

Setting up direct driver communications
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2–19
Set the scan period to match the expected rate of change for the
tag’s data. For example, if you scan every five seconds for a change
of state that occurs once an hour, the system is needlessly
burdened. Conversely, if you scan too slowly, the system cannot
monitor value changes that might occur between scans.
To configure a scan class:
1. In the Project Manager, open the System folder.
2. Open the Scan Class editor by doing one of the following:
double–click the Scan Class icon
right–click the Scan Class icon and then click Show