Alarm extensions have a boolean property called 'Alarm Inhibit'. When the property value is 'true', processing of alarm events is prevented. The alarm inhibit status is not displayed in the status of the parent point because it is not actually a property of the BStatus type.

Using bql the station can be searched for components which are alarm source extensions. The bql query builder (see 6-3) can be used to create the query or you can simply type the syntax, as shown below.

station:|slot:/|bql:select * from alarm:AlarmSourceExt

Figure 39.   Bql query builder constructing query for alarm source extensions

• Filtering by Alarm Inhibit Property

  This query returns a list of all alarm source extensions in the station regardless of whether the extension is inhibited or not. To limit the return based on the alarm inhibit property, the query needs to be modified as below (see 6-4).

  station:|slot:/|bql:select * from alarm:AlarmSourceExt where 
  alarmInhibit.boolean = 'true'

  Figure ?.   Bql query builder constructing query filtered by alarm inhibit property

  
• Displaying Specific Columns

  The filtered query returns a list of alarm source extensions whose alarm inhibit property is set to true, but the table displays all of the properties for the extension. It is preferable to further filter the results so that only the desired properties are displayed. The columns which are displayed in the table may be limited by further modifying the query as below (see 6-5).

  station:|slot:/|bql:select parent.name as 'Point Name',parent.out as 
  'Point Status' from alarm:AlarmSourceExt where alarmInhibit.boolean = 'true'

  Figure ?.   Bql query builder constructing query to filter the displayed columns

  

   NOTE: In the example above, bformat text is used to display information from the parent component of the alarm source extension. The name or displayName of the parent point and the out slot would likely be useful information to display. Other columns could be added to display information from the alarm source extension as well. 

It is also possible to use a bql query to calculate and display the number of records returned in the query. The original query can be modified as below.

station:|slot:/|bql:select * from alarm:AlarmSourceExt where 
alarmInhibit.boolean = 'true'|bql:size

Each control point in the station has both a value and a status. The status reflects the current condition or reliability of the point value. Available statuses are down, alarm, unacknowledged alarm, overridden, disabled, fault and stale.

Using bql the station can be searched for control points where the alarm status flag is true. The bql query builder (see 6-6) can be used to create the query or you can simply type the syntax below.

station:|slot:/|bql:select name as 'Point Name',out as 'Point Status' from 
control:ControlPoint where status.alarm = 'true'

Figure 40.   Bql query builder constructing query for control points in alarm

Using bql the station can be searched for control points where the overridden status flag is true. The bql query builder (see 6-7) can be used to create the query or you can simply type the syntax below.

station:|slot:/|bql:select name as 'Point Name',out as 'Point Status' from 
control:ControlPoint where status.overridden = 'true'

Figure 41.   Bql query builder constructing query for control points currently overridden