6-11SectionSystem Maintenance
152
Reference: S Install an optional battery in the NT21 when using the alarm history record
function.
S When a battery is not installed or the battery fails, the contents of the
history
record will be unpredictable when the NT21 is turned OFF and will be initial-
ized.
S Time
stamps will be recorded with the history records using the clock data read
by
the NT21 from the host. If the clock
data is incorrect, spaces will be stored
instead of the clock data.
S With
the NT21, the record
data can also be displayed by registering an alarm
history display element on the screen.
S For
details on the alarm history record function, refer to
2-15-2 Alarm History
Record Function in the Reference Manual.
S The
order of display for sort by
occurrence display (from oldest record or from
newest
record) is set with the Hist. Disp. Method memory switch (page
139).
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