7
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7 - Alarms
7�2�2 Reset when acknowledged
The "Reset when acknowledged" setting means that the
alarm remains active until a user or operator acknowledg-
es it. If the error persists after the alarm is acknowledged,
it will remain active until the error is cleared, including the
delay and hysteresis. The alarm LED ashes if an alarm is
waiting to be acknowledged. If the alarm persists after it is
acknowledged, the alarm LED stops ashing but stays lit
until the alarm is reset.
7�2�3 Automatic reset, with acknowledge
The third option – automatic reset, with acknowledge – is a hybrid. The alarm resets itself when the
error is cleared, but it still has to be acknowledged. In this case, the acknowledgement is a kind of
conrmation that someone has noticed the alarm. Details of the reset and the acknowledgement
are both recorded in the alarm log.
The alarm appears in the list of active alarms until it is acknowledged, but after it is reset the status
column will contain "Not acknowledged" instead of "Active". It is possible to acknowledge this type
of alarm while it is still active.
7�3 Alarms and events
The alarm and event log is a list of things that have occurred, af-
fecting the device and the installation. The log shows when alarms
were triggered, when they were cleared and when they were
acknowledged.
Events, errors and messages are also included in the log. See sec-
tion 7.5.7 for precise details of the possible entries and what they
mean.
You can use the checkboxes and the Update button to choose
what you want to include on the list. If you are interested in some-
thing in particular, this is a way of stripping away irrelevant infor-
mation.
The list is colour-coded. An active alarm appears in red. Rows appear in green if they contain alarms
that are inactive or have been acknowledged. Events have a white background. If an internal error is
detected, it appears on the list with a yellow background while it is active, then with a white back-
ground once it has been cleared. Messages have a pale blue background.
A-alarms and B-alarms
The WMPro does not classify
alarms as A-alarms and B-alarms
– the possibilities are in fact much
wider than this. To use summary
alarm outputs, select an action
channel in the alarm settings.
These outputs can be digital
outputs, and you can name them
A-alarm or B-alarm.
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