4. Read Status Operation
Viewing and Printing a Read Status
54
NFS-640 Operations Manual P/N 51334:B 10/03/2003
How to View and Print Hidden Event and Alarm History
The control panel maintains a copy of the preceding History buffer. For instance, if someone clears the
History buffer using Status Change programming option 4, the control panel retains a copy of the
History buffer. The copy of the preceding History buffer is called a Hidden History buffer and a copy of
the preceding Alarm History is called a Hidden Alarm History buffer.
If you attempt to view or print history and the control panel displays one of the screens shown below
you can use the options listed in the table below to view the contents of a Hidden History buffer.
Figure 40 History Empty Display
,
Figure 41 Alarm History Empty Display
Options for viewing and printing Hidden History and Hidden Alarm History do not appear in the LCD
display when in Read Status. You can view and print the contents of these Hidden History buffers using
the options listed in the table below. You read and print Hidden History and Hidden Alarm History the
same way you read and print history using the options that appear on the “Read Status” screen. The
table also contains references to the sections that contain instructions for reading and printing history.
Table 13 Hidden History Selections
To
Press
Refer to
Read Hidden Alarm
History
“How to View Read Status for
Alarm History” on page 52
Print Hidden Alarm
History
“How to Print Alarm History”
on page 53
Read Hidden History
“How to View Read Status for
Event History” on page 51
Print Hidden History
“How to Print Event History”
on page 53
HISTORY EMPTY
(ESCAPE TO ABORT)
****************************************
ALARM HISTORY EMPTY
(ESCAPE TO ABORT)
****************************************
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