The mechanism "Processing the events with the help of computational procedure of the widget" is based on the attribute "event" and the user procedure of calculating written with the help of the programming language of OpenSCADA. The events, in process of receipt, are accumulated in the attribute "event" till the moment of call of the computational procedure. The computational procedure is called with the specified frequency of calculating the widget and receives the attribute "event" value as the list of events. In the calculation procedure the user can: analyze, process and delete the processed events from the list, and add to the list new events. The remaining, after the procedure execution, and new events are analyzed for compliance with the conditions of the call by means of script of the primary mechanism, after which the remaining events are transmitted to the upper by the hierarchy widget to be processed by it, with the appending of the events path in accordance with the hierarchy of the penetration.