Alarm Grid
The Alarm Grid is a CygNet-aware control that supports the creation of customizable and interactive tables for the display and management of large amounts of alarm data in columns and rows. Five customizable column types are supported: Alarm, Facility, Generic, Point, and a column displaying an alarm icon, which can be customized based on alarm priority for unacknowledged alarms. Alarm columns are mapped to an alarm attribute; facility columns are mapped to a facility attribute; generic columns can display any kind of scripted data of your choice and its cells can be edited in run mode; and point columns are mapped to point attribute. Data can be filtered using custom alarm filtering rules. Cell background color, text color, and border color can be manually configured or sourced from the colors configured in the CygNet point scheme for single color, foreground color, or background color. Colors in the control can be overridden when a custom color palette is selected for the screen. You can also configure whether to display alarm acknowledgment as a blinking cell background, blinking text, or blinking border when a point is in alarm. A context menu is available in run mode to facilitate alarm acknowledgment, alarm clearing, alarm hiding, and ad hoc alarm suppression.
The Canvas alarm grid mirrors many of the features available in the CygNet CAS View Control in CygNet Studio.
See Configuring the Alarm Grid Control for more information.
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Sample Alarm Grid , showing context menu on point in alarm
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Property Inheritance
Property Inheritance
Property inheritance is a widely used concept in Canvas. The application supports an explicit relationship between screens, objects, and controls, where certain property values, such as SiteService and facility tags, are passed from one element to another via an inheritance framework. Screens, objects, and controls can be configured as property senders or property receivers and provide configuration options where you can explicitly define the source of the SiteService and facility. Depending on how you have your screens, objects, and controls set up, the SiteService and facility may come from any one of the following sources:
- from itself — indicated by selecting <Self> and then explicitly configuring the property
- inherited from the screen — indicated by selecting Screen, which is always present as a sender
- inherited from another control — indicated by selecting the Name of the sending control
Broadcasting
Screens and objects support an additional notification option to broadcast their SiteService and facility selection changes to other open screens running in the Canvas or Canvas View application. If configured, a <Broadcast> option is available to source the screen's SiteService and facility properties from another open screen.
For example, a text tool can be configured to get its facility from the screen and the screen can be configured to get its facility from a tag chooser. Or Screen_A might source its facility from Screen_B, which gets its facility from a tag chooser.
Receiver or Sender
The alarm grid control supports property inheritance as a receiver of its SiteService and facility, and as a sender of its facility:
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Self
Screen
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none
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none
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Screen
Other controls
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The alarm grid is multi-facility aware and depending on the level of a configured hierarchy selected (from an associated tag chooser) will depend on how many rows will be loaded into the associated grid.
Related Topics
