Echelon i.LON 100 e2 Internet Server User Manual
Page 98
i.
LON 100 Internet Server Programmer’s Reference
7-9
Property Description
<AlarmDataPoint>
<Alarm2DataPoint>
Optional. These properties define the Alarm Generator’s alarm data points.
Each data point must be referenced by the <UCPTpointName> assigned to
it in the Data Server. The data point chosen for the <AlarmDataPoint>
must use the format type SNVT_alarm. The data point chosen for the
<Alarm2DataPoint> must use the format type UNVT_alarm2.
Use a SNVT_alarm data point if your system can handle this LonMark
standard type for alarming. Use a UNVT_alarm2 data point if your system
will require the additional information you can provide with the
<UCPTalarm2Description> property. If your system can directly access the
<UCPTpointStatus> property of the input data point, you may not need to
use alarm data points, as your Alarm Generators will update the input
data point to an alarm status each time they generate an alarm. You can
read this property from a data point with the DataPointRead or
DataServerRead functions.
The <UCPTpointSatus> of the alarm data points will be updated to the
status AL_ALM_CONDITION when an alarm is generated, unless the
<UCPTcompFunction> is FN_LIMIT. In this case, the status will be
updated to any of four alarm statuses, based on the offset limit that caused
the alarm. For more information on this, see Hysteresis Levels and Offset
Limits on page 7-13.
You can register these alarm data points with the Alarm Notifier
application to generate alarm notifications and e-mail messages each time
they are updated to an alarm status. For more information on this, see
Alarm Notifier on page 8-1.
<UCPTcompFunction>
Specifies the function that the Alarm Generator will use to compare the
values of the input data point and the compare data point. For descriptions
of the comparison functions you can use, see Comparison Functions on
page 7-12.
<UCPTalarmSetTime>
Specifies the time period an alarm condition must exist before the Alarm
Generator will consider it a valid alarm and generate an alarm. You must
use the following format for this property:
DAYS HOURS:MINUTES:SECONDS.MILLISECONDS
For example, 0 1:12:12.333 indicates a time period of 1 hour, 12 minutes
and 12.333 seconds. The maximum value you can enter is:
0 1:59:59.999
The default value is:
0 00:00:00.000