Instruction Manual

i.LON 100 Internet Server Programmer’s Reference 7-11

Property Description

When an alarm occurs based on one of the offest limits described above, the

value of the input data point must reach the hysteresis value for that limit

before the alarm can be cleared, and another alarm can be generated based

on that offset limit.

This allows you to set up an Alarm Generator that will trigger an alarm

once each time the value of the input data point reaches a certain level, as

opposed to multiple times (which would occur each time the data point was

updated and its value remained within the range specified by the offset

limit).

Enter a scalar value for each of these properties. These values define the

hysteresis level that will be used for each alarm offset limit. For a more

detailed description of the hysteresis fields and how they relate to the

offset limit values, see Hysteresis Levels and Offset Limits on page 7-13.

If you use the i.LON 100 Configuration Software to modify the

configuration of an Alarm Generator after creating it with the SOAP/XML

interface, all four hysteresis properties will be reset to the value chosen for

<SCPThystHigh1>.

NOTE: If you use the AlarmGeneratorGet function to return the

configuration of an Alarm Generator whose input data point uses the

format type SNVT_temp_p#US or SNVT_temp#US, then the values of

these properties will be displayed using the SNVT_temp_f#US format. This

rule applies to all formats that use the #US specifier.

7.2.1.2.1 Alarm Priority Levels

You can select a priority level for the Alarm Generator by filling in the

<UCPTalarmPriority> property. When doing so, you must reference each priority level with

the identifier listed in Table 23.

Each time an Alarm Generator generates an alarm, the priority_level field of the alarm data

points chosen for the Alarm Generator will be updates to the priority level chosen here.

Table 23 Alarm Priority Levels

Identifier Notes

PR_LEVEL_0 Lowest alarm priority level

PR_LEVEL_1

PR_LEVEL_2

PR_LEVEL_3 Highest alarm priority level

PR_1 Life Safety Fire Alarms

PR_2 Property Safety Fire Alarms

PR_3 Fire Supervisory Alarm

PR_4 Fire Trouble/Fault (Display)

PR_6 Fire Pre-Alarm, HVAC Critical Equipment Alarm

PR_8 HVAC Alarms (BACnet Priority 8)