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6-4SectionMemory Initialization
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6-4-2 Initializing Display History Record Data
The display history record function keeps a record of the order of display of the
screens displayed during operation, and the number of times each screen is dis-
played. These records are kept only for screens for which the History attribute
has been set.
The maximum number of records is 1024 for sort by occurrence (order of display
occurrence) and 255 for sort by frequency (order of the number of times each
screen has been displayed).
Use the display history record initialization function to clear the history record
data to 0, for example when the screen data has been changed, etc. Also, if
Alarm (Use Ring Buffer) under History Setting of System in PT Configuration
(Tools) has not been checked, no more records will be stored after the maximum
number of records has been kept, and therefore the records must be periodically
initialized. If Alarm (Use Ring Buffer) is checked, when the maximum number of
records is reached the oldest record is deleted and the newest data is recorded.
Reference: The NT31/NT31C also allows the display history record data to be initialized by
controlling the PT status control area from the host. For details, refer to 2-2-1 PT
Status Control Area in the Reference Manual.