The Frequency of countable events rule type counts the occurrence of a specific machine message. The event is triggered when the frequency at which the machine message occurs exceeds the configured limit.
Example
The machine sends a message for each reject that has been produced. Production of some rejects is expected and not critical. The configured limit is seven rejects produced in a period of 20 minutes.
As soon as more than seven rejects have been produced in the configured time period, an event is triggered.