Omron NT-SERIES - SUPPORT TOOL FOR WINDOWS V4, Operation Manual

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6-3 Section Alarm
167
The [Settings] of an alarm list element are used to specify the range of bit
memory table entries that are subject to the check.
The check objective range is determined by setting the start bit memory table
entry number and the number of bit memory table entries. The maximum allow-
able number of bit memory table entries varies according to the PT model and
the setting of the number of bit memory table entries. The range of bit memory
table entry numbers is displayed in parentheses in the dialog box: Set the start
memory table entry number and the number of memory table entries so that
the displayed range is not exceeded.
While an alarm list element is displayed, the status of the bit memory table
entries in the specified range is always checked and the element displays the
message or image/library data that is set for the bit memory table entry when a
bit memory table entry is turned ON.
No.0
1
2
3
128
129
Allocation of a PC (PLC) bit to a bit memory table entry is specified at
the bit memory table. (Specified character string memory table entry
(string table) and image/library data code are also specified at the bit
memory table.)
Bit memory table
PC (PLC)
Alarm
range
The alarm range, i.e., the start address (No.) in the bit memory
table entry and the size, is specified by the alarm list element.
6-3-2 Alarm History
If a bit memory table entry for which a check mark is set for the history property
goes ON, the date/time and the number of going ON events are recorded in an
alarm history. An alarm history element displays the recorded bit table entry num-
bers in the order of occurrence or frequency when the element is displayed.
An alarm history element can also display the contents (alarm message) of the
character string memory table entry (string table) and the image/library data that
are allocated to the bit memory table entry.
Screen
Alarm
history
Bit memory table
Image/library data
WARNING HIGH TEMP.
WARNING HIGH PRESS. 98/05/12 18:25
WARNING HIGH TEMP. 98/04/10 16:02
WARNING HIGH TEMP. 98/04/10 16:02
No.1
No.2
Character string memory
table (string table)
Alarm history record data
(1) When a bit memory table entry for which a check mark is set for the history
property goes ON, the alarm history element reads out the alarm message
from the character string memory table entry (string table) and records the