Enhanced Alarm Configuration

Alarms > Enhanced Alarm Configuration

Enhanced Alarm Configuration

Enhanced Alarm Configuration (EAC) expands the CygNet alarm rules to allow a user to extend the conditions by which a configurable status bit is allowed to be set or prevented from being set. When a configurable bit is prevented from being set, any subsequent alarms or notifications that would have been generated are prevented as well. EAC conditions are defined as a series of logical expressions that reference real-time values of the same point or multiple other points. However, all points referenced must reside in the same CVS (UIS, HSS, etc.) as the point being configured. EAC conditions may contain up to 20 individual expressions, each of which could reference a separate point. The EAC configuration is available from the PNT Editor's Alarm Settings (Analog, Digital, Enumeration, String) pages.

Note: All PNT databases must be re-indexed when upgrading CygNet to a version that supports EAC features. See the CygNet Upgrade Procedure for more information.

Enhanced Alarm Configuration Rules

The evaluation of EAC conditions that allow or prevent the setting of configurable bits occurs as part of the real-time value processing loop in the CVS. The EAC conditions are executed shortly after the configurable bit thresholds are evaluated to accommodate updates to any referenced points’ real-time values that might be recorded slightly out of sequence.

The rules for Enhanced Alarm Configuration expression are:

Only referenced points residing in the same CVS as the source point are allowed.

Real-time value updates associated with EAC rules account for the case when source point values arrive before referenced point values. The process attempts to ensure that referenced point values are up-to-date in relation to the source point value, e.g., when polling a data group and the processing sequence of the individual DEIDs is not guaranteed to occur in referenced point-values-first order.

Configuration metrics and errors associated with EAC are reported via PNT and CVS service log entries as well as new SVCMON info items report metrics, such as the total number of points containing EAC rules and the number of configuration errors. See Shared Service Specific Info Items for more information.

The Point Properties page for the various point types (Analog, String, Digital, Enumeration) includes an Enhanced alarm settings button Enhanced alarm settings button that opens a new Enhanced Alarm Settings dialog box for editing.

Enhanced Alarm Settings

Enhanced Alarm Configuration Security

Understanding the CvsMetadata File