Alarm Calculation - Bit(s) Set From List

Alarms > Alarms Overview > Alarm Calculation Types > Bit(s) Set From List Alarm Calculation

Bit(s) Set From List Alarm Calculation

The Bits Set From List alarm calculation types uses one of the three calculation types listed below to monitor a list of user provided status bits by name in the reference bits for the calculation type.

All Bits Set From List (ALL_BITS) — If all of the provided status bits are set in the Base Status or Extended Status bits, the alarm bit is set, otherwise it is cleared.
Any Bit Set From List (ANY_BIT) — If any of the provided status bits are set in the Base Status or Extended Status bits, the alarm bit is set, otherwise it is cleared.
Not All Bits Set From List (NOT_ALL_BITS) — If not all of the provided status bits are set in the Base Status or Extended Status bits, the alarm bit is set, otherwise it is cleared.

These alarm calculation types can only be implemented with the CygNet Enhanced Point Scheme.

Note: The CygNet Enhanced Point Scheme is available as a separately licensed entity. See Understanding the CVS Metadata File for more information about the elements and attributes that define the CygNet Enhanced Point Scheme.

For more information, see Alarm Calculation Types and Point Status Bits.

The following image shows the area of an Analog Alarm Settings page of a PNT Editor with an enabled Calculation Error Alarm using the Any Bit Set From List (ANY_BIT) calculation type.

Any Bit Set From List

There are no calculation parameters for these calculation types. Instead, the user lists the status bits to be used for the calculation in the Reference element of the StatusBitDefinition element in the CvsMetadata.xml file.

Example

The following CVSMetadata.xml excerpt from a sample CygNet Enhanced Point Scheme shows a previously "Unused" configurable status bit now assigned to the "Calculation Error Alarm" as CONFIG12 and "ANY_BIT" as the calctype.

</StatusBitDefinition>

In this example, the Calculation Error Alarm bit (CONFIG12) is set when any of the status bits listed in the Reference element ("USER2" and "USER3") have been set. If instead, calculation type All Bits Set From List (ALL_BITS) had been used, both "USER2" and "USER3" status bits would have to be set for the Calculation Error Alarm bit to be set. And if calculation type Not All Bits Set From List (NOT_ALL_BITS) had been used, not all of the bits would have to be set for the Calculation Error Alarm bit to be set.

The following image shows the Status Bit Details pane below from the CVSMetadata sample above. The Calculation Error Alarm (CONFIG12) bit is set because USER2 bit (one of the status bits listed in the Reference element) is set, which fulfills the requirement for the calctype Any Bit Set From List (ANY_BIT).

Status Bit Details