Displaying The Alarm History Record - Omron NT21 - SETUP MANUAL 10-2001 Setup Manual

System Maintenance

6-11-4 Displaying the Alarm History Record

S The order of display for sort by occurrence display (from oldest record or from
newest record) is set with the Hist. Disp. Method memory switch (page 139).
Display the display history record data by following the menu operations from
the System Menu as shown below.
The alarm history record function is a function that continually monitors during
operation, the status of bits at the host designated in advance with bits in the bit
memory table, and records the time when these bits come ON, and the number
of times they come ON.
The record data can be displayed using an operation from the System Menu.
This section explains how to display the alarm history record data recorded in
the NT21.
Note that there are two display methods: sort by occurrence (ON time order) and
sort by frequency (order of number of times the bits have come ON).
Select Maintenance Mode.
Select Display History.
Select Sort by Occurrence or Sort by Fre-
quency.
If necessary, select the next or previous
screen by pressing [↓] (next screen) or [↑]
(previous screen).
The example screen to the left shows a
display for the sort by occurrence method
(from oldest record).
Press Quit to return to the DISPLAY HIS-
TORY MENU screen.
Section 6-11
151