Maintenance and Troubleshooting | 6-41
Viewing Historical Alarm Messages
Alarms that have been reset can be reviewed from the History Buffers in
the Stat\History menu. SCode alarms which have been reset are stored in
the ^SC History Buffer. XSCode alarms which have been reset are stored
in the ^XSC History Buffer.
Each History Buffer contains a maximum of (9) alarms. The codes dis-
played represent past alarm conditions, with ^SC1/^XSC1 being the
most recent and ^SC9/^XSC9 being the oldest. If more than nine SCodes
alarm accumulate in a buffer, the oldest code is overwritten.
If two or more alarms are detected simultaneously, the displayed alarm
SCode is a sum of the primary codes. To resolve a non-primary SCode into
its primary codes, subtract the largest primary code from the displayed
number. Continue to subtract the largest primary code from the remain-
der until a primary code is left.
Example:
The displayed SCode is “20”. The alarms detected are:
20 Total sum of all primary SCodes found
-16 w Dirty Cell [Possible-Cell-Contamination]
4 w No HC DP [Hydrocarbon-Dewpoint-Temperature-Not-Found]
To view the history of alarm messages (SCode or XSCode) detected by the
diagnostics function:
1. From the RUN menu, press once to view the Stat\History main
menu screen.
2. Press repeatedly until the ^SC1 History Buffer screen is displayed.
To view the ^XSC1 History Buffer screen, press again.
To view the primary codes from either screen, press the ‘+’ or ‘–’ but-
tons.
3. To back out of either of these screens, press if you wish to view
other Stat\History sub-menus, or press to go to another main menu.
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