Omron NT31 Operation Manuals page 458

Inputting Character Strings
Reference
Recording Format for the Display History Record
Reference: The display history record data is backed up by the built-in battery of the
Maximum Number of Records
(4) [Checking the display history record]
Display and check the recorded display history record.
There are two methods for doing this: displaying the record from the System
Menu, and displaying a screen with the display history record function during
operation.
In either case, the records can be presented in occurrence order (order of dis-
play) or frequency order (order of frequency of display).
- The "History" attribute can only be set for user screens. It cannot be set for sys-
tem screens and consequently these screens cannot be included in the display
history record.
- When an overlapping screen is displayed, the data for the parent screen is re-
corded.
- Bit 11 (display history initialization) of the PT status control bits can also be used
to initialize the display history record.
For the display history record, the following data is recorded in the memory for
screens with the "History" attribute.
- Screen number
- Time of display
- Display history title
NT31/NT31C and is therefore retained even when the power to the NT31/NT31C
is turned OFF or the NT31/NT31C is reset.
S Occurrence order
The data of up to 1024 screens can be recorded in the occurrence order display
history record. The operation when 1024 records is exceeded depends on the
setting made for "Screen (Use Ring Buffer)" on the "PT Configuration" – "Sys-
tem" screen at the Support Tool: select whether the record is to be stopped or the
older records are to be deleted.
If no check mark is set for "Screen (Use Ring Buffer)", recording is stopped, and
if a check mark is set, the new data is recorded and the older data is deleted
instead.
S Frequency order
The data of up to 255 screens can be recorded in the frequency order display
history record. Even if this limit is exceeded, still 255 records remain displayed.
Section 7-15
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