niagaraDriver-NiagaraAlarmDeviceExt

This component (Alarms extension) specifies how to map alarms from a station into the current station’s own alarm subsystem, plus provide status properties related to alarm sharing.

Only drivers that support local (native) alarming provide this extension under the device component. This includes the NiagaraNetwork’s NiagaraStation, BacnetNetwork and ObixNetwork. Unlike some other device extensions, this extension provides no special views, nor does it contain other special components.

The alarms extension under an ObixClient device (ObixDriver) is modeled differently, where properties specify the oBIX watch interval and URI, and one or more child ObixAlarmImport components specify the available alarm feeds from the represented oBIX server. Each alarm feed (ObixAlarmImport) has properties to specify the alarm class with which to map into the station’s subsystem, as well as status properties. This alarms device extension is unique in its special Obix Alarm Manager view, from which you discover, add, and manage alarm feeds.

Figure 51. Alarm Device Ext properties

To access this view under the NiagaraNetwork, expand Config > Drivers > NiagaraNetwork > NiagaraStation, right-click the Alarms component in the Nav tree, and click Views > AX Property Sheet.

Property	Value	Description
Alarm Class, first drop-down list	drop-down list (defaults to `Use Existing`)	Specifies the alarm routing option for the component. `Replace` provides a selection list of a local alarm classes, from which to select one to use for all alarms received from this device. `Use Existing` routes alarms from this remote station to any matching alarm class, that is, one with an identical name as that in each alarm record. If the program finds no local matching alarm class, it uses the station's default alarm class. `Prepend` adds leading text (as specified) to the incoming alarm class string, then routes it to any local matching alarm class in the station. `Append` adds trailing text (as specified) to the incoming alarm class string, then routes it to any local matching alarm class in the station.
Alarm Class, second property	text field if the first value is `Prepend` or `Append`; drop-down list if the first value is `Replace` (defaults to Medium)	Provides additional information based on the selection made in the drop-down list on the left. The empty text field determines a prefix and suffix for the alarm class. The `Replace` drop-down list selects among: Medium High Low Off Alarm Class
Last Received Time	read-only	Displays the last time the Supervisor station received an alarm from this device.
Source Name	drop-down list (defaults to Prepend with ORD: %parent.parent.displayName%:	Identifies the source of the alarm.`Replace` uses the format text entered in this property as alarm source (ignoring whatever incoming alarmSource string is receives). `Use Existing`: Uses only the incoming alarmSource string and ignores the format text entered in this property. `Prepend`: T(default) Adds leading text (as specified) to the incoming alarmSource string, where the default format is %parent.parent.displayName%. `Append` adds trailing text (as specified) to the incoming alarmSource string. For example, if the format entered is -%parent.parent.displayName%.
Worker State	read-only	Reports the state of the alarm system process.
Last Send Time	read-only	Reports when the last local alarm was routed to this device. This is configured under the local station’s AlarmService with a corresponding StationRecipient or BacnetDestination component linked to one or more AlarmClass components.
Last Send Time Failure	read-only	Reports when the last local alarm routed to this station could not be sent.
Last Send Failure Cause	read-only	Reports the cause of the failure to rout local alarms to this station.

niagaraDriver-NiagaraAlarmDeviceExt

Figure 51. Alarm Device Ext properties

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