Understand implicit modes of event frame generation

Beginning with the 2018 release, users of asset analytics in PI AF have the option to select different modes of event frame generation. Prior to 2018, users had to explicitly set a start trigger (now called Explicit Trigger). In 2018 or later versions of PI AF, you can choose among the three implicit modes in addition to an explicit trigger: pulse, step and step continuous. After having selected Event Frame Generation as your analysis type, select one of the following as Generation Mode:

• Pulse: a transition from zeroth state to any other state starts an event frame, and transition to the zeroth state ends the event frame. You have an option to generate a root cause event frame in Advanced Event Frame Settings.

• Step: any change in value ends one event frame and starts the next, except when the value changes to the zeroth state, which ends the current event frame but does not start a new event frame.

• Step Continuous: all transitions would close the open event frame and start a new event frame

Note that you must select a triggering attribute that is either integer, string or enumeration value for these event frames. For pulse and step event frames, you will need to select an attribute as a trigger and set zeroth state. Zeroth state is not supported for step continuous event frames. Zeroth state determines when the event frame should be closed. You can select zeroth states from digital state or enumeration sets. For more information, see PI EFGen topic Event start and end detection.