Omron NT31C Reference Manual page 186

Alarm List, Alarm History
Reference:
1, 2, 3...
Outline of Alarm List/Alarm History Operations
The operations of the alarm list and alarm history are described below.
S The alarm list only checks host bits allocated to bit memory tables within the
designated range. This checking is performed only while the alarm list is dis-
played.
The alarm history only checks host bits allocated to bit memory tables for
which History is set. The relevant host bits are checked continually. Conse-
quently, if a large number of host bits is set the processing of the PT may be
delayed.
S Alarm lists are displayed in ascending order of bit memory table numbers and
alarm histories are displayed in frequency order or occurrence order. When an
alarm history is displayed in occurrence order, the order can be specified as
from the newest record or from the oldest record by setting the Hist. Disp. Meth-
od memory switch of the PT.
S In the case of alarm lists, if the status of a host bit allocated to a bit memory table
changes to 0 (OFF), the message and image/library data are also automatical-
ly cleared at the same time.
In the case of alarm histories, even if the status of a host bit allocated to a bit
memory table changes to 0 (OFF), the message and image/library data re-
main.
S The alarm history record data can also be displayed and printed out in the
Maintenance mode under the System Menu of the PT.
1. When the status of an allocated bit of a bit memory table for which the alarm
list/history function is set changes to 1 (ON), the contents of the set charac-
ter string memory table are displayed as a message.
Contents of character string memory table set
for the bit memory table whose status has
changed to 1 (ON).
PROCESS 3 STOPPED
WATER TANK OVERHEATING
2. Each message area is a touch switch and pressing a message displays the
set image/library data. At the same time, the pressed message is displayed
in reverse video.
PROCESS 3 STOPPED
WATER TANK OVERHEATING
If an alarm list with multiple lines is
created, alarms are displayed in
ascending order of bit memory table
numbers.
If the bit memory tables are set in
ascending order of priority, the display
will also be arranged in accordance
with the order of priority.
Image/library data corresponding to the first alarm message
The alarm list is composed of
touch switches. When a displayed
alarm message is pressed, the
corresponding image/library data is
FAULT
displayed. The pressed alarm
message is displayed in reverse
video.
Process 3 stopped by fault.
Check DM2500.
Section 2-11
175