The System Faults feature has the ability to run smart rules against a hierarchy of equipment or different systems. This feature allows you to write Custom Rules and Global Rules which can span points across multiple pieces of equipment and meters. For example, if multiple pieces of equipment are working together to serve a building (a chiller serving an AHU, that is serving a VAV), you can write Custom rules to identify faults that may be impacting an entire system, rather than just a piece of equipment in isolation.