Omron NT - SUPPORT TOOL FOR WINDOWS V4 Operation Manual page 183

Alarm
170
String Table Entry
Image/Library Code
Use of image/library data
Image/library code
Color
Property settings for alarm history element
History Info
Order Type
S Order of Frequency
S Order of Occurrence
S All bit memory table entries for which a check mark is set for the alarm history
property are subject to alarm history recording.
Section 6-3