Trend extensions - Metasys - LIT-12012116 - Server - Metasys UI - 6.0

Johnson Controls System Configuration Tool (JCT) Help

Product name
Metasys UI
Document type
User Guide
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Revision date

The trend extension monitors and records the changes in the behavior of an individual attribute over time, thereby assisting you with diagnosing various system-wide behavioral characteristics. The trend extension collects sample values at timed intervals or only upon changes in the given value. Trend data is still collected if the object is unreliable. The trend extension continues to log data using the previous value preceded by ???, which indicates an unreliable status.

For example, use a trend extension to collect data from the Analog Input object of a controller on the N2 Bus, which reports information such as outdoor air temperature or room air temperature.

Trend extensions are different from Trend Studies because Trend Studies query both the ADS and Network Engine for historical data. Trend extensions query only the Network Engine.

Note: Multiple trend extensions can be added to an object for the same or different attributes. However, when an object has multiple trend extensions for the same attribute, the data samples for all of the trend extensions on that same attribute are combined when viewing any one of those trends using a Trend Study.

For trend performance information, refer to the Metasys System Configuration Guide (LIT-12011832).