Abstract: A mobile device and a guard unit are utilized to ensure the performance of a safety activity needed to be executed before starting and/or ending an operation of an elevator. Furthermore, according to a method to be performed by such a mobile device and a guard unit, the mobile device or the guard unit provides a request to perform the safety activity for a user of the mobile device via a human-machine interface, and the mobile device sends a permission message to the elevator to permit the starting or ending of the operation of the elevator in response to an answer provided by the user to the request via the human-machine interface.

Abstract: A method and an arrangement for commissioning a passenger transportation system includes a mobile device that is computer-controlled from an application and which is configured to exchange data both with a programmable controller controlling the passenger transportation system and with an external database in which configuration information regarding configurations of a plurality of passenger transportation systems is stored.