About Health Indicator Sources

Health Indicator records are associated with health indicator source and reading source records that contain the limit values and reading values, respectively, that are compared to determine the status of the health indicator. One health indicator may exist for each health indicator source record associated with a piece of equipment. Reading source records are then used to provide the most recent reading value to the health indicator.

The following table summarizes the records that are configured as sources in the baseline GE Digital APM database.

Health indicator source record	Corresponding reading source
GE Tag	GE Tag Event records
Measurement Location	Reading records
OPC Tag	The most recent reading available from the OPC Server.
KPI	KPI Measurement records
None (e.g., health indicators created via Policy Designer)	Health Indicator Value records

The following table summarizes the fields that define health indicator limit values for each of the baseline health indicator source records.

Health indicator source record	Fields Containing Limit Values
GE Tag	Upper and lower level limit fields in the GE Tag record.
Measurement Location	Upper and lower level limit fields in the Measurement Location record.
OPC Tag	Upper and lower level limit fields in the OPC Tag record.
KPI	Target and Critical fields in the KPI Measurement record associated with the KPI record. In KPI records where a low value is good, the Target value represents the upper level 1 limit and the Critical value represents the upper level 2 limit. In KPI record where a high value is good, the Target value represents the lower level 1 limit and the Critical value represents the lower level 2 limit.
None	Upper and lower level limit fields in the Health Indicator record.

The following table summarizes the fields in each reading source record that contain the latest reading value, which the Asset Health Indicator service copies into either the Last Numeric Reading Value or Last Char Reading Value field in corresponding Health Indicator records.

Reading source	Field Containing Reading Value
GE Tag Event record	Type
Reading record	Reading Value Character Reading Value Numeric
Reading from the OPC Server	N/A
KPI Measurement record	Actual
Health Indicator Value record	Value (Numeric)