Omron NT31 Operation Manuals page 25

Functions of the NT31/NT31C
14
Trend graphs
Trend graphs display chronological changes in the value in a numeral
memory table, converting the value to a percentage within the range
–100% to +100% of a preset value. The trend graph shifts position with
the passage of time.
Past data can also be recorded, and the numeral memory table can be
read (sampled) even while the trend graph is not being displayed.
The user can choose to stop sampling, restart sampling, or display past
data, by pressing touch switches.
S Alarm list/history
The alarm list/history function displays messages in list form, or graphics
(image/library data), in accordance with changes in bit memory table statuses.
For the alarm list, a series of bit memory tables are monitored, and messages
(contents of character string memory tables) set for bit memory tables that come
ON are displayed.
For the alarm history, bit memory tables for which the history property is set are
continually monitored, and the time when they come ON and number of times
they come ON are recorded and displayed together with the message (character
string) set for the bit memory table.
The NT31/NT31C allows selection of the display order as "newest record first" or
"oldest record first" by memory switch setting.
The alarm list function is used to determine which bits are ON at the present
time. The alarm history function is used to determine the times at which alarms
occurred in the past and how many times alarms have occurred.
- Alarm list
Message (character string table No. 32)
set for bit memory table No. 14
Character string table No. 32
Image/library
data 113C
When the message displayed is pressed, the image/library
data (113C) set for bit memory table No. 14 is displayed.
- Alarm history
Message (character string table No. 13)
set for bit memory table No. 24
Character string table No. 13
Character string table No. 12
Image/library
data 102B
When the upper message displayed is pressed, the image/library
data (102B) set for bit memory table No. 13 is displayed.
No.13
Character string table No. 50
Image/library data 1002
No.14
Character string table No. 32
Image/library data 113C
No.15
Character string table No. 54
Image/library data 1125
Character string table No. 11
No. 22
Image/library data 005F
No. 23
Character string table No. 12
Image/library data 102A
Character string table No. 13
Image/library data 102B No. 24
Section 1-2
Bit
HOST
A000000
0
L001003 1(ON)
1
0 D010015
Recorded data
Bit memory table No. 24
97/12/04 11:19:20
Bit memory table No. 23
97/12/04 11:25:12