Learn about event start and end detection

There are three approaches to determining event start and end based on point value:

• Step

• Pulse

• Include zeroth state (Continuous): All transitions end the current event frame and start a new one. Available only for Step.

The following diagram compares step and pulse active point behavior. Given the transitions shown, step configuration generates three events, while pulse generates one event.

Step

Any change in value ends one event and starts the next, except when the value changes to the zeroth state, which ends the current event but does not start a new event. To generate events when the active point changes to its zeroth state, enable Include zeroth state. For example, the following figure shows a set of digital values recorded by a point that is tracking phases. The zeroth state is indicated by the value Inactive.

Events are generated (started) for all transitions except the transition from "XFER_OUT" to "Inactive".

Pulse

A transition from the zeroth state to any other value starts an event, and a transition to the zeroth state ends the event. The following example shows data suitable for using pulse behavior.