Skip to main content
Version: v4 (Stable)

Alarm Masking Properties

This dialog box allows you to configure the alarm masking options.

General​

This tab defines the basic masking options for the alarm.

Alarm masked by​

This property allows you to define another alarm tag that will automatically hide the alarm when it is in the alarm state or in the normal state according with the "Alarm" or "Normal" option. The identifier of this tag can be entered in the edit field or selected from the tags previously defined by clicking on the button .

Alarm​

This option avoids alarm avalanches in certain circumstances (power cut for example). An alarm masked by an active alarm does not result in any processing other than its logging as a simple event.

Normal​

This option allows to activate an alarm only when two simultaneous alarms are present (logical ET of two alarms).

Advanced​

This tab defines the advanced masking options for the alarm.

Alarm item​

This field displays the reference of the alarm item in the data source (monitored application variable that contains the alarm information).

Masking condition​

  • Masking item: This field defines the item of the monitored application that will contain the masking information to read. Enter the name of this item in the field or click on the button to the right of the edit field to search and select this item in the data source. If this field is empty, the item will be the same as the alarm item defined above.

  • Condition: The masking condition defines the state in which the item value is considered as an alarm masking indication.

Depending on the complexity of the condition to be expressed, select the type:

  • Simple: The condition is defined by an operator selected from the drop-down list and a reference value entered in the adjacent field. See Coding a masking condition.

  • Expression: The condition is defined by an alphanumeric expression. This expression can be entered in the edit field or generated from the expression editor by clicking the button to the right of the edit field (see Edition of an expression).

Masking report​

The option "Transmits masking actions to the server" allows, when validated, to transmit the masking/unmasking commands made from ALERT to the monitored application.

This transmission is carried out by writing the "Value to be written on mask" or the "Value to be written on unmask" in the "Item to write".

  • Item to write: This field defines the item of the monitored application to be written to mask or unmask the alarm. Enter the name of this item in the field or click on the button to the right of the edit field to search and select this item in the data source. If this field is empty, the item to be written will be the same as the masking item defined above.

  • Value to be written on mask: This field defines the value that will be passed to the monitored application to mask the alarm. This value can be a numeric value or a string. It can be entered in the field or generated from the expression editor by clicking on the button to the right of the edit field.

  • Value to be written on unmask: This field defines the value that will be passed to the monitored application to unmask the alarm. This value can be a numeric value or a string. It can be entered in the field or generated from the expression editor by clicking on the button to the right of the edit field.