Omron NT21 Setup Manual

6-4SectionMemory Initialization
112
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 Dis -
play
History (Use Ring Buf fer) under History Setting of System in PT Configura -
tion
(T ools) has not been checked, no more records will be stored after the maxi -
mum
number of records has been kept, and therefore the records must be peri -
odically initialized. If Display History (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: S The
NT21 also allows the display history record data to be initialized by con -
trolling
the PT Status Control Area from the host. For details, refer to 2-2-1 PT
Status Control Area in the Reference Manual.
S If
the optional battery is not installed, the display history record data will be ini -
tialized when the PT’s power is turned OFF.

Omron NT21 Specifications

General

Display Type	STN monochrome LCD
Display Size	5.7 inches
Resolution	320 x 240 pixels
Touch Panel	Analog resistive
Communication Ports	RS-232C, RS-422/485
Power Supply	24 VDC
Operating Temperature	0 to 50°C
Storage Temperature	-20 to 60°C
Weight	0.8 kg
Memory	512 KB